Artículos de revistas: "MgO nanoparticule"

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ÖZGÜR, Tayfun, Erdi TOSUN, Ceyla ÖZGÜR, Gökhan TÜCCAR y Kadir AYDIN. "EFFECT OF MgO NANOPARTICULE ADDITIVES ON PERFORMANCE AND EXHAUST EMMISSIONS OF DIESEL FUELLED COMPRESSION IGNITION ENGINE". MATTER: International Journal of Science and Technology 3, n.º 3 (17 de noviembre de 2017): 72–85. http://dx.doi.org/10.20319/mijst.2017.32.7285.

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ÖZGÜR, Tayfun, Erdi TOSUN, Ceyla ÖZGÜR, Gökhan TÜCCAR y Kadir AYDIN. "EFFECT OF MgO NANOPARTICULE ADDITIVES ON PERFORMANCE AND EXHAUST EMMISSIONS OF DIESEL FUELLED COMPRESSION IGNITION ENGINE". MATTER: International Journal of Science and Technology 3, n.º 3 (17 de noviembre de 2017): 72–85. http://dx.doi.org/10.20319/mijst.2017.33.7285.

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Shaukat, Arslan, Ghulam Hussain, Shahzad Irfan, Muhammad Umar Ijaz y Haseeb Anwar. "Therapeutic Potential of MgO and MnO Nanoparticles Within the Context of Thyroid Profile and Pancreatic Histology in a Diabetic Rat Model". Dose-Response 20, n.º 3 (julio de 2022): 155932582211287. http://dx.doi.org/10.1177/15593258221128743.

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Magnesium oxide (MgO) and manganese oxide (MnO) have been reported to be effective against Diabetes Mellitus (DM). However, their nanoparticulate form has not been evaluated for antidiabetic effect. MgO and MnO nanoparticles (15–35 nm) were synthesized and subsequently characterized by ultraviolet-visible spectroscopy (UV-VIS), zeta sizer, and scanning electron microscopy. 6–7 weeks old rats weighing 200–220 mg were divided into 07 equal groups (n = 8), namely, negative control (NC), positive control (PC), standard control (Std-C), MgO high dose group (MgO-300) and low dose group (MgO-150), and MnO nanoparticle high dose (MnO-30) and low dose group (MnO-15). Diabetes was chemically induced (streptozotocin 60 mg/kg B.W) in all groups except the NC. Animals were given CMD and water was ad libitum. Nanoparticles were supplemented for 30 days after the successful induction of diabetes. Blood and tissue samples were collected after the 30th day of the trial. The mean serum glucose, insulin, and glucagon levels were improved maximally in the MgO-300 group followed by MgO-150 and MnO-30 groups. Whereas the MnO-15 group fails to show any substantial improvement in the levels of glucose, insulin, and glucagon as compared to the positive control group. Interesting the serum triiodothyronine, thyroxine, and thyroid-stimulating hormone levels were markedly improved in all the nanoparticle treatment groups and were found to be similar to the standard control group. These results highlight the modulatory properties of MgO and MnO nanoparticles and merit further studies delineating the molecular mechanisms through which these nanoparticles induce antidiabetic effects.

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Hasbullah, N. I., Mat Zain Mazatulikhma y N. Kamarulzaman. "Nanotoxicity of Magnesium Oxide on Human Neuroblastoma SH-SY5Y Cell Lines". Advanced Materials Research 667 (marzo de 2013): 160–64. http://dx.doi.org/10.4028/www.scientific.net/amr.667.160.

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The use of magnesium oxide (MgO) nanoparticles in industrial applications has been raised over the last decade. However, there is limited toxicology information available regarding the effects of MgO nanoparticles. In this study, cytotoxicity and neurotoxicity of this nanoparticle on SH-SY5Y cell lines was investigated. In order to assess the cytotoxicity effect, SH-SY5Y cells were exposed to three different types of MgO nanoparticles (MgO 5, MgO 10 and MgO 24) for 24, 48 and 72 h. The concentration of nanoparticles ranges from 1nM to 1mM. Cell viability was determined by MTS assay. Neurotoxicity test was performed to determine the effects of MgO nanoparticles on human neural cells. Results indicated that MgO nanoparticles are not toxic to both undifferentiated and differentiated SH-SY5Y cells. With further exploration, the safety and health concern regarding exposure of MgO nanoparticles can be verified since the increasing of using this nanoparticle in industry over the time.

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Sanjurjo-García, José Angel, Pablo Samuel Schabes-Retchkiman, Ma Guadalupe Macedo, José Luis García-Rivas, Javier Illescas y Sonia Martínez-Gallegos. "Influence of the metal concentration on the phytosynthesis of nanoparticles of Iron and Zinc". MRS Advances 4, n.º 59-60 (2019): 3207–13. http://dx.doi.org/10.1557/adv.2019.473.

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ABSTRACTIn this work, green nanotechnology has been applied by using phytochemical compounds as reducing agents from the plant extract of Hydrocotyle ranunuculoides through three modifications of the phytosynthesis method to prepare Fe and Zn nanoparticles, in three different concentration of the metallic solution. In the third modification a MgO support was included to avoid the Fe and Zn NP agglomeration. The nanoparticles size was 5±1 nm, and for the Fe NPs, it was determined with a cubic structure a Fe3O4 composition, and Zn nanoparticles were obtained with a hexagonal structure and Zn° composition. In the third method, MgO nanoparticle, the support appears as Mg0 nanoparticles surrounded by Fe0 and Zn0 nanoparticles. According to the three used methods pathways, the main influence is the modification in the method synthesis. Hybrid nanocomposites provide a means in preventing agglomeration of the NPs and hence avoid coalescence and loss of properties.

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Leizou, Kaywood Elijah y Muhammad Aqeel Ashraf. "GREEN SYNTHESIS APPROACH, CHARACTERIZATION, AND APPLICATIONS OF MgO NANO PARTICLES USING CURRY LEAF (MURRAYA KOENIGII)". Acta Scientifica Malaysia 6, n.º 1 (2022): 06–09. http://dx.doi.org/10.26480/asm.01.2022.06.09.

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Nanotechnology has emerged as a state-of-the-art and cutting-edge technology with multifarious applications in a wide array of fields. The goal of this study was to create magnesium oxide nanoparticles using an aqueous extract of curry leaves (murraya koenigii or bergera koenigii). The morphology, elemental content, shape, and size of the produced MgO nanoparticles were determined using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analysis (EDX). According to the SEM data, the MgO nanoparticle forms were well disseminated, with a spherical shape and particle sizes ranging from 20 to 100 nm. While the EDX pattern infers the sample’s elemental composition, the average occurrence of Mg was 32.45 percent. Plant extracts were used to successfully produce MgO nanoparticlse, which is an essential alternative technique because it is non-toxic, biocompatible, and environmentally benign.

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Faisal, Shah, Abdullah, Hasnain Jan, Sajjad Ali Shah, Sumaira Shah, Muhammad ad Rizwan, Nasib Zaman et al. "Bio-Catalytic Activity of Novel Mentha arvensis Intervened Biocompatible Magnesium Oxide Nanomaterials". Catalysts 11, n.º 7 (27 de junio de 2021): 780. http://dx.doi.org/10.3390/catal11070780.

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In the present study Mentha arvensis medaited Magnesium oxide nanoparticles were synthesized by novel green route followed by advanced characterization via XRD, FTIR, UV, SEM, TEM, DLS and TGA. The mean grain size of 32.4 nm and crystallite fcc morphology were confirmed by X-ray diffractive analysis. Scanning and Transmission electron microscopy analysis revealed the spherical and elliptical morphologies of the biosynthesized nanoparticles. Particle surface charge of −16.1 mV were determined by zeta potential and zeta size of 30–120 nm via dynamic light scattering method. Fourier transform spectroscopic analysis revealed the possible involvement of functional groups in the plant extract in reduction of Mg2+ ions to Mg0. Furthermore, the antioxidant, anti-Alzheimer, anti-cancer, and anti-H. pylori activities were performed. The results revealed that MgO-NPs has significant anti-H. pyloric potential by giving ZOI of 17.19 ± 0.83 mm against Helicobacter felis followed by Helicobacter suis. MgO-NPs inhibited protein kinase enzyme up to 12.44 ± 0.72% at 5 mg/mL and thus showed eminent anticancer activity. Significant free radicals scavenging and hemocompatability was also shown by MgO-NPs. MgO-NPs also displayed good inhibition potential against Hela cell lines with maximum inhibition of 49.49 ± 1.18 at 400 µg/mL. Owing to ecofriendly synthesis, non-toxic and biocompatible nature, Mentha arvensis synthesized MgO-NPs can be used as potent antimicrobial agent in therapeutic applications.

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Pradheesh, G., J. Suresh, S. Suresh, Kumar P. Satheesh y Vincent Alexramani. "Biosynthesis of MgO nanoparticles and Bioactivity studies on the medicinal plant Cyathea nilgirensis Holttum". Research Journal of Chemistry and Environment 26, n.º 9 (25 de agosto de 2022): 64–72. http://dx.doi.org/10.25303/2609rjce064072.

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Plant secondary metabolites play a major role in biosynthesis of nanoparticles. As a new approach, we have used aqueous ethanolic extract of Cyathea nilgirensis Holttum to synthesize MgO nanoparticles by chemical precipitation method. FT-IR spectroscopy studies have proved that biomolecules have acted as stabilizing agents in the synthesis of MgO nanoparticle. SEM analysis has exhibited the morphological appearance of MgO nanoparticles. Energy Dispersive X-Ray analysis has proved the presence of both magnesium and oxygen in the synthesized MgO nanoparticles. The fungal species A. niger is observed to have remarkably higher percentage of inhibition (71.4%). The results of cancer studies suggest that as concentration increases from 10 μg to 200 μg, the percentage of inhibition of MgO nanoparticles increases. Thus plant extract mediated MgO nanoparticles have proven to be a better antimicrobial and anticancer agent.

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Photiphitak, Chanu, Pattana Rakkwamsuk, Pennapa Muthitamongkol y Chanchana Thanachayanont. "A Combined Effect of Plasmon Energy Transfer and Recombination Barrier in a Novel TiO2/MgO/Ag Working Electrode for Dye-Sensitized Solar Cells". International Journal of Photoenergy 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/795138.

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Novel TiO2/MgO/Ag composite electrodes were applied as working electrodes of dye-sensitized solar cells (DSSCs). The TiO2/MgO/Ag composite films were prepared by dip coating method for MgO thin films and photoreduction method for Ag nanoparticles. The MgO film thicknesses and the Ag nanoparticle sizes were in ranges of 0.08–0.46 nm and 4.4–38.6 nm, respectively. The TiO2/MgO/Ag composite films were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The TiO2/MgO/Ag composite electrodes were sensitized by immersing in a 0.3 mM of N719 dye solution and fabricated for conventional DSSCs.J-Vcharacteristics of the TiO2/MgO/Ag DSSCs showed that the MgO film thickness of 0.1 nm and the Ag nanoparticle size of 4.4 nm resulted in maximum short circuit current density and efficiency of 8.6 mA/cm2and 5.2%, respectively. Electrochemical Impedance Spectroscopy showed that such values of short circuit current density and efficiency were optimal values obtained from plasmon energy transfer by 4.4 nm Ag nanoparticles and recombination barrier by the ultrathin MgO film.

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Fatiqin, A., H. Amrulloh y W. Simanjuntak. "Green synthesis of MgO nanoparticles using Moringa oleifera leaf aqueous extract for antibacterial activity". Bulletin of the Chemical Society of Ethiopia 35, n.º 1 (7 de mayo de 2021): 161–70. http://dx.doi.org/10.4314/bcse.v35i1.14.

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Nanoparticle fabrication using plant extracts is an important alternative method because it is non-toxic, biocompatible, and environmentally friendly. In this study, green synthesis of MgO nanoparticles using Moringa oleifera leaf water extracts was conducted by mixing the extract and a solution of magnesium chloride. The product was characterized using different techniques, i.e. UV-Visible (UV-Vis) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The UV-Vis spectrum of MgO nanoparticles shows an absorption at 280 nm. The size of the synthesized MgO nanoparticles ranges from 20-50 nm. The antibacterial activity of MgO nanoparticles was seen from the zone of inhibition against Staphylococcus aureus (6.3 mm) and against Escherichia coli (6 mm). MgO nanoparticles have been successfully fabricated using Moringa oleifera leaf aqueous extracts, providing an alternative method for synthesizing MgO nanoparticles. KEY WORDS: Antibacterial activity, Escherchia coli, MgO nanoparticles, Moringa oleifera, Staphylococcus aureus Bull. Chem. Soc. Ethiop. 2021, 35(1), 161-170. DOI: https://dx.doi.org/10.4314/bcse.v35i1.14

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Idriss, Hajo, M. Habib M. Habib, A. I. Alakhras y H. M. El Khair. "Nano-sized Metal Oxides and Their use as a Surface Disinfectant Against COVID-19: (Review and Perspective)". Oriental Journal Of Chemistry 38, n.º 6 (30 de diciembre de 2022): 1328–37. http://dx.doi.org/10.13005/ojc/380601.

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Contamination of surfaces has long been identified as a significant factor in viral transmission. Therefore, sustained efforts are required to address this issue. This work aims to build a scientific database on nano-sized metal oxides as intelligent materials for surface disinfection against corona viruses, synthesize and characterize nano-sized MgO, and discuss the possibility of using it in virus eradication. The MgO nanoparticle was prepared through the heating method. Meanwhile, XRD diffractometer, Scan electron microscope, and nitrogen adsorption were used to characterize the MgO nanoparticle. The synthesized MgO nanoparticle showed an average crystallite size of 18.55nm, lattice strain 0.0053, surface area 27.56 m2/g and d-spacing 2.1092. The outcomes of this review highlight the advantage and challenges of AgO, CuO, ZnO, TiO2 and MgO nanoparticles and their utilization for surface disinfection against coronaviruses.

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Deepa, K., M. Leo Edward, A. Shalini y V. Jaisankar. "Preparation of Inorganic Composites of Chitosan/magnesium Oxide Nanoparticle for Antibacterial Activity". Journal of ISAS 2, n.º 2 (31 de octubre de 2023): 21–30. http://dx.doi.org/10.59143/isas.jisas.2.2.kcna4459.

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Natural polymer based nanocomposites have received attention in research due their biocompatible nature and their versatile application in medical field. In the current investigation, we report the synthesize of chitosan /magnesium oxide nanoparticle (CS/MgO) composite material. The prepared sample was characterized by analytical methods such as FTIR, XRD and HRSEM.The antibacterial activity of the CS/MgO composite was evaluated. FT-IR spectral results showed the CS/MgO composite has distinctive functional groups. HR SEM images revealed that the formation of well dispersed MgO nanoparticles in CS and it is observed that the MgO nanoparticles are embedded between the functional moieties present in the chitosan which shows the good interaction between chitosan and MgO nanoparticles. The antibacterial activity of the composite was evaluated against Staphylococcus aureus and Escherichia coli. It is observed that the CS/MgO composite material showed comparatively higher inhibition against E. coli than S.aureus

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Ayinde, Wasiu B., Mugera W. Gitari, Munkombwe Muchindu y Amidou Samie. "Biosynthesis of Ultrasonically Modified Ag-MgO Nanocomposite and Its Potential for Antimicrobial Activity". Journal of Nanotechnology 2018 (29 de agosto de 2018): 1–10. http://dx.doi.org/10.1155/2018/9537454.

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This study reports a green synthesis route for a bilayered Ag-MgO nanocomposite using aqueous peel extract of Citrus paradisi (grapefruit red) under an accelerated uniform heating technique and its antibacterial potency against Escherichia coli. Surface modifications and composition of the nanocomposite were examined using a UV-visible spectrophotometer, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) equipped with an energy dispersive X-ray (EDX) analyzer. The efficiencies of the as-synthesized Ag-MgO nanocomposite against Escherichia coli were examined. The synthesized Ag-MgO nanocomposite showed characteristic synergetic bands at 290 nm for MgO nanoparticle and at around 440 nm for Ag nanoparticle which blue-shifted to 380 nm in the composite. A spherically dispersed nanocomposite with cubical crystal lattice network with a diameter of about 20–100 nm comprising Ag nanoparticle embedded within MgO nanoparticles was obtained. The nanocomposite produced stronger antibacterial activity against Escherichia coli as compared to MgO nanoparticle, indicating a higher interaction between Ag and MgO ions. The nanocomposite was successfully synthesized via an efficient modified method by bioreductive agents with an improved synergistic antibacterial property towards water purification.

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Rohmawati, Lydia, Silviana Nurul Fathoni, Woro Setyarsih, Nugrahani Primary Putri y Darminto Darminto. "Irradiation Time Optimization on Photocatalytic Activity of Nanoparticles MgO from Dolomite Bangkalan". Trends in Sciences 21, n.º 5 (25 de febrero de 2024): 7442. http://dx.doi.org/10.48048/tis.2024.7442.

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Dolomite is a type of sedimentary rock material that is often found in the Bangkalan Madura area. This dolomite has a higher MgO compound content than in the other areas, namely 40 %, but its utilization has only been as fertilizer and building materials. For this reason, this research aims to determine the characteristics of MgO nanoparticles and their application in photocatalytic with visible light irradiation. The synthesis of MgO nanoparticles used the hydrochloric acid leaching method, and the results were characterized by X-ray diffraction, Fourier transform infrared, Scanning electron microscopy, Transmission electron microscopy, Raman spectroscopy, Photoluminescence, and Ultraviolet-visible spectroscopy. The results showed that the synthesized MgO nanoparticles had a periclase phase and were shaped like a spherical cube with an average nanoparticle size of 27 nm and an energy gap of 3.9 eV. The optical properties of the MgO nanoparticles showed quite strong luminescence at a Raman shift of 1,087.36 cm−1, which was associated with the type of vibrational waves in the atomic lattice, and there were surface defects on the surface of the MgO nanoparticles, namely in the emission spectra of 720.06 and 740.39 nm originating from oxygen vacancies (F-center) and Mg vacancies (V-center). The photocatalytic activity of MgO nanoparticles in visible light showed the optimum time to degrade 30 ppm methylene blue dye in 360 min and yielded a degradation percentage of 99 %. Therefore, MgO nanoparticles could be used for processing industrial dye waste using visible light. HIGHLIGHTS The synthesis of MgO Nanoparticles from Bangkalan dolomite used the hydrochloric acid leaching method The presence of nanocrystallite size, crystal defects, and oxygen vacancies in MgO nanoparticles can increase photocatalytic activity MgO nanoparticles can degrade methylene blue dye with an optimum time of 360 minutes under visible light irradiation GRAPHICAL ABSTRACT

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Amrulloh, Hanif, Awalul Fatiqin, Wasinton Simanjuntak, Hapin Afriyani y Annissa Annissa. "Antioxidant and Antibacterial Activities of Magnesium Oxide Nanoparticles Prepared using Aqueous Extract of Moringa Oleifera Bark as Green Agents". Journal of Multidisciplinary Applied Natural Science 1, n.º 1 (30 de enero de 2021): 44–53. http://dx.doi.org/10.47352/jmans.v1i1.9.

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In this research, Magnesium oxide nanoparticles (MgONPs) was prepared from MgCl2 solution using aqueous extract of M. oleifera bark as green agent. Preparation procedure involved mixing of MgCl2.6H2O solution and the aqueous extract of M. oleifera bark, followed by drop wise addition of NaOH solution. The formation of MgO nanoparticles in this synthesis was confirmed using UV-Vis absorption. The spherical crystal structure of MgO nanoparticle confirmed XRD analysis. The average particle size of the synthesized MgO nanoparticles measured between 60 - 100 nm using SEM and TEM images and PSA results. MgONPs synthesized showed good antioxidant activity and antibacterial activity against S. aureus, E. faecalis, E. coli, and S. dysenteriae bacteria.

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An, G., D. Y. Ju, T. Kumazawa y M. Okasabe. "Coating of MgO and Bio-Medicine on Surface of Magnetic Nanoparticles". Advanced Materials Research 317-319 (agosto de 2011): 460–63. http://dx.doi.org/10.4028/www.scientific.net/amr.317-319.460.

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This paper is mainly to describe coating method of MgO nano film with about 2nm and Bio-medicine materials on surface the magnetic nanoparticle. The coated composite magnetic nanoparticles of coated were dispersed into ion exchange water, widely known as magnetic fluids for applying to Drug Delivery System(DDS). Through observation of micro-structure of MgO film and the bio-nanopaticles on coating surface, and evaluation of magnetic property, we known that the effectiveness of this coating method of MgO and the bio-medicine coated on surface of magnetic nanoparticles was confirmed.

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Proniewicz, Edyta, Ajith Mohanavilasam Vijayan, Olga Surma, Aleksandra Szkudlarek y Marcin Molenda. "Plant-Assisted Green Synthesis of MgO Nanoparticles as a Sustainable Material for Bone Regeneration: Spectroscopic Properties". International Journal of Molecular Sciences 25, n.º 8 (11 de abril de 2024): 4242. http://dx.doi.org/10.3390/ijms25084242.

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This work is devoted to magnesium oxide (MgO) nanoparticles (NPs) for their use as additives for bone implants. Extracts from four different widely used plants, including Aloe vera, Echeveria elegans, Sansevieria trifasciata, and Sedum morganianum, were evaluated for their ability to facilitate the “green synthesis” of MgO nanoparticles. The thermal stability and decomposition behavior of the MgONPs were analyzed by thermogravimetric analysis (TGA). Structure characterization was performed by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), ultraviolet-visible spectroscopy (UV-Vis), dynamic light scattering (DLS), and Raman scattering spectroscopy (RS). Morphology was studied by scanning electron microscopy (SEM). The photocatalytic activity of MgO nanoparticles was investigated based on the degradation of methyl orange (MeO) using UV-Vis spectroscopy. Surface-enhanced Raman scattering spectroscopy (SERS) was used to monitor the adsorption of L-phenylalanine (L-Phe) on the surface of MgONPs. The calculated enhancement factor (EF) is up to 102 orders of magnitude for MgO. This is the first work showing the SERS spectra of a chemical compound immobilized on the surface of MgO nanoparticles.

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Ge, Guanghui, Yongzhe Tang, Yuxia Li y Liangsong Huang. "Effect of Environmental Temperature on the Insulating Performance of Epoxy/MgO Nanocomposites". Applied Sciences 10, n.º 20 (9 de octubre de 2020): 7018. http://dx.doi.org/10.3390/app10207018.

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This article reports on the development of nano-MgO/epoxy resin composites with various mass ratios via a solution blending method. The influence of MgO nanofillers on the thermal properties and the effect of environmental temperature on the insulating properties of the composite material were analyzed. The results show that the thermal conductivity of the composites increased with an increasing MgO nanofiller content. Compared with the pure epoxy resin, the thermal conductivity increased by 75% when the content of MgO nanoparticles was 7%. The volume resistivity first increased and then decreased with an increasing doping concentration. The volume resistivity increased by 26.8% in comparison with the pure epoxy resin when the content of MgO nanoparticles was 1%, while its dielectric constant and dielectric loss increased with temperature. In addition, the dielectric constant increased and the dielectric loss first decreased and then increased with an increasing MgO nanoparticle content. Moreover, the MgO composites changed from a glassy to a rubbery state, and the breakdown strength was significantly reduced with an increased temperature. When the temperature was higher than the glass transition temperature, the breakdown strength decreased by 51.3% compared with the maximum breakdown strength at 20 °C. As the content of MgO nanoparticles increased, the breakdown strength of the composite first increased and then decreased. The highest breakdown strength was achieved when the content of MgO nanoparticles was 1%, which was 11.1% higher than that of the pure epoxy resin. It was concluded that the MgO nanofillers can significantly improve the thermal properties of epoxy composites and their insulation performance at high temperatures.

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Purwajanti, S., V. Nida, A. Labanni, H. Bahua y O. B. Pongtuluran. "Green Synthesis of Ag Nanoparticle-Decorated MgO Microspheres by Curcuma xantorrizha Extract and Its Potential Antimicrobial Activity". IOP Conference Series: Earth and Environmental Science 1201, n.º 1 (1 de junio de 2023): 012084. http://dx.doi.org/10.1088/1755-1315/1201/1/012084.

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Abstract Water pollution caused by bacteria is a significant global environmental issue that can pose serious risks to public health and ecological systems. Developing high-activity antibacterial agents is therefore crucial. This study describes the eco-friendly synthesis of Ag nanoparticle-decorated MgO microspheres, using C. xanthorrhiza extract as a reducing agent, without the use of stabilizers or surfactants. The Ag nanoparticles immobilized on the MgO microsphere support were analyzed using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The Ag/MgO microspheres exhibited antibacterial properties against both gram-positive and gram-negative bacteria. The findings suggest that Ag nanoparticle-decorated MgO microspheres could be a promising alternative for treating bacteria-contaminated wastewater, owing to their ease of preparation, low cost, environmentally friendly nature, and high antibacterial activity.

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Dawas, Huda Saad y Faiq Hassan Ali. "Impact of MgONPs and its Effect on Chlorophyll, Carotene and Leaf Area of Soft Wheat Plant". NeuroQuantology 20, n.º 3 (26 de marzo de 2022): 39–42. http://dx.doi.org/10.14704/nq.2022.20.3.nq22037.

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Goal of this project is to synthesize MgO nanoparticles using environmentally friendly and low-cost ingredients. Plant extracts could be using to make oxide nanoparticles, which could be a cheaper alternative to established chemical methods. In this study examined the effects of four different MgO nanoparticle concentrations (0,100,200 and 300 ppm) and 3 different methods (seed soak, foliar application also seed soak + foliar application together) on chlorophyll, carotene, and leaf area content in two different wheat plant types (abaa 95 also rasheed), When the wheat plant was subjected to MgO nanoparticles, the results revealed an increase in all important indicators compared to the control treatment, which produced the greatest results for seed soak also foliar application together treatment. In comparison controller treatment, which offered the greatest result content for spray application & seed soak, treatment, results revealed rise all indicators remembered previously after exposed to MgONPS as value (3.86 Chlorophyll a+b), (0.97 Carotien), (31.25 Leaf area) of the wheat plant abaa 95 in compar with rasheesd which have the lower value. Despite the fact that magnesium is essential for plants, this study discovered that when it is present in nanoparticle form, it behaves significantly better.

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Alajmi, Zafer, Tao Fu, Yan Tao Zhao, Shui Yun Yang y Jia Mao Sun. "Ag-Enhanced Antibacterial Property of MgO Film". Materials Science Forum 859 (mayo de 2016): 90–95. http://dx.doi.org/10.4028/www.scientific.net/msf.859.90.

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MgO and silver-containing MgO (AgMgO, 3.3, 9.1 at% Ag) films were sol-gel coated on titanium to improve its antibacterial property. Thermal analyses of MgAc2·4H2O powder revealed that MgO was crystallized at 400 °C. X-ray diffraction analysis showed that MgO was converted to Mg(OH)2 or Mg5(CO3)4(OH)2·4H2O during the ageing in air. Silver nanoparticles at the surface of AgMgO films were identified by scanning electron microscopy and x-ray photoelectron spectroscopy. The MgO film was about 1.5 um thick. The potentiodynamic polarization test in the Ca-free Hank’s balanced salt solution showed that the coated titanium samples had better corrosion resistance than the polished one. The dissolution of silver nanoparticles resulted in a current peak in the polarization plots. In the antibacterial test against E. Coli, the inhibition zone width was 0.3, 1.6, 2.0 mm for the films with 0, 3.3, 9.1 at% Ag, respectively. The bactericidal mechanisms of the MgO and AgMgO films were discussed. The present work would provide a facile method for antibacterial surface modification of titanium based osteo-implants.

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Steinerová, D., A. Kalendová, J. Machotová y M. Kohl. "Anticorrosion coatings based on novel acrylate binders containing MeO nanoparticles". Koroze a ochrana materialu 63, n.º 4 (1 de diciembre de 2019): 153–58. http://dx.doi.org/10.2478/kom-2019-0020.

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Abstract Water based paints are increasingly attracting interest mainly with a view to reducing air pollution with volatile organic compounds (VOC). However, the protective properties of water-based paints are inferior to those of solvent-based paints and so new ways to increase the resistance of water-based systems are sought. The present contribution describes the preparation and testing of environmentally friendly anti-corrosion paints based on novel water-based self-crosslinking acrylate latexes containing appropriate pigments and ZnO or MgO nanoparticles at a concentration of 1.5 % (with respect to the monomers) compared to the same systems free from the nanoparticles. Both the effect of the MeO nanoparticles and the effects of the pigment species and particle shapes on the paint film properties were examined. The MeO nanoparticles were found to improve all the properties tested. The latexes with MgO exhibited the highest resistance to flash corrosion while the latexes with ZnO exhibited the highest anticorrosion resistance. Furthermore, the systems with the calcium-aluminium polyphosphosilicate based pigment were superior to all the remaining systems in this respect. It is concluded that binders with nanoparticles can be used as a basis for anticorrosion coatings provided that a suitable pigment is selected.

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Li, Xi, Yong-tao Yi, Pei-yu Guo, Ru-dan Zhou y Hua Li. "A Convergent Fabrication of Silk Fibroin Coated Magnesium Oxide Conjugated Phosphate Functionalized Chitosan Hydrogel for Bone Regeneration". Journal of Biomedical Nanotechnology 19, n.º 8 (1 de agosto de 2023): 1400–1412. http://dx.doi.org/10.1166/jbn.2023.3652.

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The potential of injectable hydrogels based on natural polysaccharides (NPH) for repairing significant bone defects seems promising. Yet their osteogenic, angiogenic, and mechanical characteristics fall short of expectations. To overcome these disadvantages of chitosan-based hydrogels, silk fibroin-coated magnesium oxide nanoparticles (SF-MgO-NPs) were integrated into fabricated aqueous-soluble phosphocreatine-functionalized chitosan (CMP) solution to create a CMP@SF-MgO-NPs injectable hydrogel via supramolecular assembly. This hydrogel’s phosphocreatine acts as a reservoir to regulate Mg2+ release and as a location for supramolecular interaction with MgO-NPs. Injectable CMP@SF-MgO hydrogels encouraged in vitro calcium phosphate (CaP) deposition, ALP activity, and proliferation to MC3T3-E1 cells. This hydrogel (CMP@SF-MgO-NPs(5)) was also highly effective in stimulating the growth of new bone in calvarial lesions of critical size in rats. Therefore, the injectable hydrogel made of CMP@SF-MgO-NPs shows promising potential for bone regeneration.

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Nguyen, Duy Khang Vu, Thuy Loan Thi Pham, My Hanh Thi Tran, Tuong Vi Tran y Dang Khoa Nguyen Vo. "Graphene Oxide and Graphene Oxide-TiO2 Nanocomposites: Synthesis, Characterization, and Rhodamine B Photodegradation Investigation". Journal of Nanoscience and Nanotechnology 21, n.º 3 (1 de marzo de 2021): 1507–16. http://dx.doi.org/10.1166/jnn.2021.19076.

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In this study, graphene oxide (GO) sheets were successfully synthesized using two routes: conventional Hummers' (HGO) and modified Hummers' (or Marcano's) (MGO) methods. GO sheets were then assembled with TiO2 nanoparticles to form nanocomposites (i.e., HGO–TO and MGO–TO). The properties of HGO and MGO and their nanocomposites with TiO2 were evaluated by Fouriertransform infrared (FTIR), Raman, ultraviolet-visible (UV-Vis) adsorption, and diffuse reflectance (DRS) spectroscopies, X-ray diffraction (XRD), and thermal gravimetric analysis (TGA). The specific surface area, pore volume, and pore size of MGO, determined by Brunauer-Emmett-Teller (BET) equation, were 565 m2g−1, 376 cm3 g−1, and 30 nm, respectively; all of these parameters decreased after MGO was combined with TiO2. In addition, compared with HGO, MGO possessed higher oxidation level and more stable bonding with TiO2 nanoparticles. The morphology of HGO and MGO, which were characterized by scanning electron (SEM) and transmission electron microscopies (TEM), together with energy-dispersive X-ray (EDX) spectroscopy and elemental mapping technique, was determined to consist of TiO2 nanoparticle-assembled GO sheets. All GO–TiO2 nanocomposite samples exhibited a very high activity (˜100%) toward rhodamine B (RhB) dye photodegradation under natural sunlight exposure within 60 min. The obtained results for the GO–TiO2 nanocomposite showed the potential of its application in wastewater purification and other environmental aspects.

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Seghir, Bachir Ben, Meriem Hima, Fatima Moulatti, Ibtihal Sahraoui, Ilham Ben Amor, Soumeia Zeghoud, Hadia Hemmami et al. "Exploring the Antibacterial Potential of Green-Synthesized MgO and ZnO Nanoparticles from Two Plant Root Extracts". Nanomaterials 13, n.º 17 (26 de agosto de 2023): 2425. http://dx.doi.org/10.3390/nano13172425.

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The green approach-based nanoparticle synthesis is considered a more cost-effective and ecologically responsible method of producing nanoparticles than other standard techniques. A major accomplishment in resolving these issues is the use of nanoparticles for environmental pollution remediation. This article describes a simple method for producing MgO and ZnO nanoparticles (NPs) using aqueous extracts of Zingiber officinale and Glycyrrhiza roots as the stabilizing and reducing agents, respectively. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersed X-ray (EDX) spectroscopy methods were used to characterize the biologically synthesized metal oxide nanoparticles (MO NPs). The XRD results showed that the mean crystallite sizes of synthesized ZnO and MgO NPs, which have excellent purity, are 12.35 nm and 4.83 nm, respectively. The spherical or elliptical shape of the synthesized NPs was confirmed by the SEM analysis. The antibacterial activity of the synthesized NPs against both Gram-negative and Gram-positive bacteria was thoroughly investigated. With a medium zone of inhibition of 7 to 10 mm, the as-synthesized MgO NPs and ZnO NPs demonstrated moderate antibacterial activity towards various bacterial strains.

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Chereches, Elena Ionela y Alina Adriana Minea. "Experiments on the Electrical Conductivity of PEG 400 Nanocolloids Enhanced with Two Oxide Nanoparticles". Nanomaterials 13, n.º 9 (5 de mayo de 2023): 1555. http://dx.doi.org/10.3390/nano13091555.

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This paper aims to provide some insights into the pH and electrical conductivity of two classes of nanocolloids with PEG 400 as the base fluid. Thus, nanoparticles of two oxides—MgO and TiO2—were added to the base fluid in 5 mass concentrations in the range 0.25–2.5 %wt. The stability was evaluated in terms of pH at ambient temperature, while the electrical conductivity was discussed at both ambient temperature and up to 333.15 K. The electrical conductivity of PEG 400 was previously discussed by this group, while the behavior of the new nanocolloids was debated in terms of the state of the art. More precisely, the influence of MgO increases electrical conductivity, and an enhancement of up to 48% for 0.25% MgO was found, while the influence of TiO2 nanoparticles was found to be in similar ranges. In conclusion, electrical conductivity varies with temperature and the addition of nanoparticles to the base fluid, although the mechanisms that are driving the nanoparticle type and concentration influence are not yet entirely assumed in the available literature.

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Hornak, Jaroslav. "Synthesis, Properties, and Selected Technical Applications of Magnesium Oxide Nanoparticles: A Review". International Journal of Molecular Sciences 22, n.º 23 (25 de noviembre de 2021): 12752. http://dx.doi.org/10.3390/ijms222312752.

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In the last few decades, there has been a trend involving the use of nanoscale fillers in a variety of applications. Significant improvements have been achieved in the areas of their preparation and further applications (e.g., in industry, agriculture, and medicine). One of these promising materials is magnesium oxide (MgO), the unique properties of which make it a suitable candidate for use in a wide range of applications. Generally, MgO is a white, hygroscopic solid mineral, and its lattice consists of Mg2+ ions and O2− ions. Nanostructured MgO can be prepared through different chemical (bottom-up approach) or physical (top-down approach) routes. The required resultant properties (e.g., bandgap, crystallite size, and shape) can be achieved depending on the reaction conditions, basic starting materials, or their concentrations. In addition to its unique material properties, MgO is also potentially of interest due to its nontoxicity and environmental friendliness, which allow it to be widely used in medicine and biotechnological applications.

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Alsaedi, Sally A., Sihama I. Salih y Fadhil A. Hashim. "Preparation and Characterization of Polymer Blend and Nano Composite Materials Based on PMMA Used for Bone Tissue Regeneration". Engineering and Technology Journal 38, n.º 4A (25 de abril de 2020): 501–9. http://dx.doi.org/10.30684/etj.v38i4a.383.

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As the elderly population increases, the need for bone loss treatments is increasing. Vital substances used in such treatments are required to continue for a longer period and work more effectively. The particularly important biological material is poly methyl methacrylate (PMMA) bone cement, which is widely used in damaged bone replacement surgery. So, this study focused on the role of added some nanoparticles consist of zirconia (ZrO2), and magnesia (MgO) on the binary polymeric blend (Acrylic bone cement: 15% PMMA) for a bone scaffold. Where, ZrO2 and MgO nanoparticle was added with selected weight percentages (0, 0.5, 1, 1.5 and 2 wt.%), which were added to the polymer blend matrix. Some mechanical properties were studied including the tensile strength and young modulus for all the prepared samples. The chemical bonding of nanoparticles and synthetic binary polymeric blend composites was evaluated by Fourier Transform Infrared (FTIR) spectroscopy. Tensile strength and young modulus of binary polymeric blend reinforced with 1.5 wt.% ZrO2, and 1 wt.% MgO, significantly increased. The surface morphology of the fracture surface of tensile specimens was examined by Scanning electron microscope (SEM). The SEM images confirmed that the homogenous distribution of nanoparticles (ZrO2, and MgO) within the polymeric blend matrix.

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Fomenko, Elena, Igor Altman y Igor E. Agranovski. "Effect of External Charging on Nanoparticle Formation in a Flame". Materials 14, n.º 11 (28 de mayo de 2021): 2891. http://dx.doi.org/10.3390/ma14112891.

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This paper attempts to demonstrate the importance of the nanoparticle charge in the synthesis flame, for the mechanism of their evolution during formation processes. An investigation was made of MgO nanoparticles formed during combustion of magnesium particles. The cubic shape of nanoparticles in an unaffected flame allows for direct interpretation of results on the external flame charging, using a continuous unipolar emission of ions. It was found that the emission of negative ions applied to the flame strongly affects the nanoparticle shape, while the positive ions do not lead to any noticeable change. The demonstrated effect emphasizes the need to take into account all of the phenomena responsible for the particle charge when modeling the nanoparticle formation in flames.

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Zhao, Feiyue, Tingli Tang, Sijie Hou y Yanchun Fu. "Preparation and Synergistic Effect of Chitosan/Sodium Phytate/MgO Nanoparticle Fire-Retardant Coatings on Wood Substrate through Layer-By-Layer Self-Assembly". Coatings 10, n.º 9 (31 de agosto de 2020): 848. http://dx.doi.org/10.3390/coatings10090848.

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Fire-retardant chitosan/sodium phytate/MgO nanoparticle (CH/SP/nano-MgO) coatings were loaded on a wood substrate via electrostatic layer-by-layer self-assembly and characterized by scanning electron microscopy and energy-dispersive spectrometry. The flammability and thermal degradation of the original wood and wood samples treated with chitosan, chitosan/sodium phytate, chitosan/sodium phytate/MgO nanoparticles were studied by limiting oxygen index (LOI), exposure combustion experiments and thermogravimetric analysis (TGA), respectively. The CH/SP/nano-MgO coating served as an intumescent fire-retardant system that created a physical protection cover and exhibited the best fire retardant performance. The LOI value was 30.2% and required approximately 16–17 s to self-extinguish when exposed to air. The TGA curves also showed that char formation protected the wood from combustion.

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M, Muthulakshmi y Madhumitha G. "Exploring the characterization of Ni doped MgO nanoparticles using co-precipitation method". Nanoscale Reports 3, n.º 1 (30 de abril de 2020): 30–33. http://dx.doi.org/10.26524/nr.3.6.

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Nanotechnology is a field of applied science focused on design, synthesis and characterization of nanomaterials. The nickel and magnesium have improved their applications in transparent electrodes and nano electronics. In addition, magnesium oxide has moisture resistance and high melting point properties. In the present work has been carried out in the development of green crystalline powder of nickel doped magnesium oxide nanoparticles by Co-precipitation method, from the mixture of nickel chloride and magnesium chloride with KOH as solvent. From the XRD results, crystalline size of the particle can be observed. Spherical structure of Ni doped MgO nanoparticles were indicated by SEM results and powdered composition of samples were obtained from FTIR. EDAX represents the peak composition of the nanoparticle. The above analytical techniques have confirmed that the Ni doped MgO nanoparticles obtained from the mixture of NiCl2 and MgCl2.

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Zhou, Yutao, Shufeng Yang, Jingshe Li, Wei Liu y Anping Dong. "Effects of Heat-Treatment Temperature on the Microstructure and Mechanical Properties of Steel by MgO Nanoparticle Additions". Materials 11, n.º 9 (13 de septiembre de 2018): 1707. http://dx.doi.org/10.3390/ma11091707.

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The characteristics and formation mechanisms of intragranular acicular ferrite (IAF) in steel with MgO nanoparticle additions were systematically investigated for different isothermal heat-treatment temperatures, and its influence on mechanical properties was also clarified. The results indicate that the inclusions were finely dispersed and refined after adding MgO nanoparticles. In addition, with decreasing heat-treatment temperature, the microstructure changed from grain boundary ferrite (GBF) and polygonal ferrite (PF) to intragranular acicular ferrite. Moreover, the steel with MgO additions had excellent mechanical properties in the temperature range of 973 to 823 K and an average Charpy absorbed energies value of around 174 J at 873 K due to the significant refinement of the microstructure and nucleation of intragranular acicular ferrite.

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Díez, Rebeka, Oscar E. Medina, Lady J. Giraldo, Farid B. Cortés y Camilo A. Franco. "Development of Nanofluids for the Inhibition of Formation Damage Caused by Fines Migration: Effect of the Interaction of Quaternary Amine (CTAB) and MgO Nanoparticles". Nanomaterials 10, n.º 5 (11 de mayo de 2020): 928. http://dx.doi.org/10.3390/nano10050928.

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Fines migration is a common problem in the oil and gas industry that causes a decrease in productivity. In this sense, the main objective of this study is to develop nanocomposites based on the interaction of quaternary amine (hexadecyltrimethylammonium bromide—CTAB) and MgO to enhance the capacity of retention of fine particles in the porous medium. MgO nanoparticles were synthesized by the sol–gel method using Mg(NO3)2·6H2O as a precursor. Nanoparticles were characterized by dynamic light scattering (DLS), the point of zero charge (pHpzc), thermogravimetric analysis, and Fourier transform infrared spectroscopy (FT-IR). Different nanoparticle sizes of 11.4, 42.8, and 86.2 nm were obtained, which were used for preparing two system nanofluids. These systems were evaluated in the inhibition of fines migration: in the system I MgO nanoparticles were dispersed in a CTAB-containing aqueous solution, and system II consists of a nanocomposite of CTAB adsorbed onto MgO nanoparticles. The fines retention tests were performed using Ottawa sand 20/40 packed beds and fine particles suspensions at concentrations of 0.2% in a mass fraction in deionized water. Individual and combined effects of nanoparticles and CTAB were evaluated in different treatment dosages. The analysis of the interactions between the CTAB and the MgO nanoparticles was carried out through batch-mode adsorption and desorption tests. The best treatment in the system I was selected according to the fines retention capacity and optimized through a simplex-centroid mixture design for mass fractions from 0.0% to 2.0% of both CTAB and MgO nanoparticles. This statistical analysis shows that the optimal concentration of these components is reached for a mass fraction of 0.73% of MgO nanoparticles and 0.74% in mass fraction of CTAB, where the retention capacity of the porous medium increases from 0.02 to 0.39 mg·L−1. Based on the experimental results, the nanofluids combining both components showed higher retention of fines than the systems treated only with CTAB or with MgO nanoparticles, with efficiencies up to 400% higher in the system I and higher up to 600% in the system II. To evaluate the best performance treatment under reservoir conditions, there were developed core flooding tests at fixed overburden pressure of 34.5 MPa, pore pressure at 6.9 MPa and system temperature at 93 °C. Obtaining critical rate increases in 142.8%, and 144.4% for water and oil flow in the presence of the nanofluid. In this sense, this work offers a new alternative for the injection of nanocomposites as a treatment for the problem of fines migration to optimize the productivity of oil and gas wells.

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Ullah, Habib, Ikram Ullah, Gauhar Rehman, Muhammad Hamayun, Sajid Ali, Abdur Rahman y In-Jung Lee. "Magnesium and Zinc Oxide Nanoparticles from Datura alba Improve Cognitive Impairment and Blood Brain Barrier Leakage". Molecules 27, n.º 15 (25 de julio de 2022): 4753. http://dx.doi.org/10.3390/molecules27154753.

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Epilepsy is a neurological disorder involving persistent spontaneous seizures and uncontrolled neuronal excitability that leads to cognitive impairments and blood–brain barrier (BBB) disruption. Currently available antiepileptic drugs present side effects and researchers are trying to discover new agents with properties to overcome these drawbacks. The aim was to synthesize magnesium oxide (MgO) and zinc oxide (ZnO) nanoparticles from Datura alba fresh leaf extracts and evaluate their anti-epileptic potential in mice kindling or a repetitive seizures model. The phytoassisted synthesized nanoparticles were characterized using spectroscopy; FT-IR, XRD, SEM, and EDX. Analysis of the NPs confirmed the crystalline pleomorphic shape using the salts of both zinc and magnesium possibly stabilized, functionalized and reduced by bioactive molecules present in plant extract. By using several characterization techniques, NPs were confirmed. UV-Vis spectroscopy of biologically produced ZnO and MgO revealed distinctive peaks at 380 nm and 242 nm, respectively. Our findings categorically demonstrated the reductive role of biomolecules in the formation of ZnO and MgO NPs. The mice kindling model was induced using seven injections of Pentylenetetrazole (PTZ, 40 mg/kg, i.p) for 15 days alternatively. The results showed that mice post-treated with either ZnO or MgO nanoparticles (10 mg/kg, i.p) significantly improved in respect of behavior and memory as confirmed in the Morris water maze (MWM), open field (OF), novel object recognition (NOR) test compared with PTZ treated mice. Furthermore, the ZnO and MgO nanoparticle treatment also maintained the integrity of the BBB, reducing the leakage, as confirmed by Evans blue dye (EBD) compared with PTZ treated mice only. In summary, the current finding demonstrates that green synthesized ZnO and MgO nanoparticles have neuroprotective, ant-epileptic potential, molecular mechanisms, and clinical implications need to be further explored.

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Rashid, Farhan Lafta, Ahmed Hashim, M. H. Abbas y Aseel Hadi. "Exploring the Optical and Electrical Characteristics of MgO/SiC-H2O Nanofluids for Thermal Energy Storage". East European Journal of Physics, n.º 1 (2 de marzo de 2023): 181–84. http://dx.doi.org/10.26565/2312-4334-2023-1-23.

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Heat is transferred to storage medium during the charging phase of thermal energy storage (TES), and it is then released during the discharging phase. It may be used to industrial operations like metallurgical transformations or solar power facilities. Heat is stored in materials that alter temperature, phase, or chemical composition in sensible, latent, and thermochemical media, respectively. Optimal heat storage has a long history. This study describes investigating the optical and electrical properties of MgO/SiC-H2O nanofluids for applications including thermal energy storage. Results indicate that when MgO/SiC NP concentrations were raised to 1.2 gm/L, absorbance rose by approximately 66.9% and transmittance by about 54%. Additionally, the increase in MgO/SiC NP concentration will raise absorbance, which indicates improved nanofluid dispersion. Additionally, when MgO/SiC nanoparticle concentrations approach 1.2 gm/L, the electrical conductivity of nanofluids increases by roughly 49.2%, and the melting time reduces as the concentration of MgO/SiC nanoparticles rises.

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36

M. Jebur, Yousif y Frial G. Abd. "effect of MgO NPs that synthesis by Streptococcus spp. on immune system in rabbits". Al-Kufa University Journal for Biology 15, n.º 3 (31 de diciembre de 2023): 88–89. http://dx.doi.org/10.36320/ajb/v15.i3.13374.

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Abstract The current study describes a low-cost, environmentally friendly, and repeatable magnesium oxide nanoparticle manufacturing process mediated by Streptococcus spp. The UV spectrophotometer, Atomic Force Microscopy (AFM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Field Emission Scanning Electron Microscopy (FE-SEM) were all used to characterize the nanoparticles. The crystallographic cubic pattern seen by the XRD indicates that the structure of nanoparticles is mostly crystalline. The characterisation peaks and functional groups of MgO nanoparticles were identified using FTIR analysis. Furthermore, the study of MgO NPS produced by S. salivarius and S. mutans using field-emission scanning electron microscopy (FESEM) revealed that their average diameters were 49.85 nm and 66.15 nm, respectively. The findings of all immunological tests conducted in this investigation showed that MgO NPs produced by S. mutans and S. salivarius were substantially different from the control group (P 0.05) for systemic and mucosal antibody, respectively. In comparison to the control group, which had a mean value of (10)(1), MgO NPs biosynthesized from S. mutans and S. salivarius generated titers with mean values (1280)(2560) and (128)(256), respectively. In contrast to the control group, where the mitotic index resulted in a mean value of (3.56), the findings for the mitotic index were (10.16)(7.83). LIF in the test groups (51.33)(44.1) were significant compared to the control group (102.5).The MgO NPs elicited cellular immunity (delayed type hypersensitivity), which led to an increase in the spleen weight index in both test groups compared to the control.

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Garai, Mrinmoy, Arianit A. Reka, Basudeb Karmakar y Atiar R. Molla. "Microstructure–mechanical properties of Ag0/Au0 doped K–Mg–Al–Si–O–F glass-ceramics". RSC Advances 11, n.º 19 (2021): 11415–24. http://dx.doi.org/10.1039/d0ra10519h.

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In understanding the catalytic efficacy of silver (Ag⁰) and gold (Au⁰) nanoparticles (NPs) on glass-ceramic (GC) crystallization, the microstructure–machinability correlation of a SiO₂–MgO–Al₂O₃–B₂O₃–K₂O–MgF₂ system is studied.

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Abdulwaahb, Hala Mahmood, Bassam G. Rasheed y Hanadi H. Altawil. "Deposition of MgO Nanoparticles by Laser Pyrolysis". Al-Nahrain Journal for Engineering Sciences 25, n.º 1 (3 de abril de 2022): 20–27. http://dx.doi.org/10.29194/njes.25010020.

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Magnesium oxide nanoparticles were deposited by laser pyrolysis process. Three types of lasers were employed CW CO2, Q-switched Nd-YAG (short pulses) and long pulses Nd-YAG lasers. The size and density of nanoparticles vary with laser energy, power, pulse duration and the scanning speed of the laser. In this method, MgO nanoparticles were deposited by a laser beam on a quartz substrate from aqueous solution of magnesium nitrate. AFM images reveal formation of small nanoparticle size of 24.5 nm with surface roughness 6.97nm by Q-switched Nd-YAG laser (10 ns) when the energy was 1J. While for CO2 laser, the smallest size was 18.8 nm at 0.4mm/s scanning speed with surface roughness 5.21nm at the same scanning speed. Moreover, long Nd-YAG pulses laser produces relatively larger average size of 37.5nm at 0.8ms pulse duration. The absorption spectra from UV-Visible spectroscopy were also conducted. The best absorption intensity was obtained at a wavelength ranging between 420-430 nm for both lasers. Finally, Thermal analysis using COMSOL Multiphysics software for the deposition process reveals that maximum temperature about 440Kfor Q-Switched Nd-YAG laser at 1J laser energy. While for RF CO2 laser, the maximum temperature obtained at 0.4mm/s scanning speed is 850K.This work provides a good knowledge for the deposition of nanoparticles using laser beams.

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Taher, Fatemah A., Mohamed Gouda, Mai M. Khalaf, Saad Shaaban, Alnoor Y. A. Al Bosager, Dania A. A. Algafly, Metwally K. Mahfouz, Manal F. Abou Taleb y Hany M. Abd El-Lateef. "Magnesium Ortho-Vanadate/Magnesium Oxide/Graphene Oxide Embedded through Cellulose Acetate-Based Films for Wound Healing Applications". Materials 16, n.º 8 (11 de abril de 2023): 3009. http://dx.doi.org/10.3390/ma16083009.

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A multifunctional nano-films of cellulose acetate (CA)/magnesium ortho-vanadate (MOV)/magnesium oxide/graphene oxide wound coverage was fabricated. Through fabrication, different weights of the previously mentioned ingredients were selected to receive a certain morphological appearance. The composition was confirmed by XRD, FTIR, and EDX techniques. SEM micrograph of Mg3(VO4)2/MgO/GO@CA film depicted that there was a porous surface with flattened rounded MgO grains with an average size of 0.31 µm was observed. Regarding wettability, the binary composition of Mg3(VO4)2@CA occupied the lowest contact angle of 30.15 ± 0.8o, while pure CA represents the highest one at 47.35 ± 0.4°. The cell viability % amongst the usage of 4.9 µg/mL of Mg3(VO4)2/MgO/GO@CA is 95.77 ± 3.2%, while 2.4 µg/mL showed 101.54 ± 2.9%. The higher concentration of 5000 µg/mL exhibited a viability of 19.23%. According to optical results, the refractive index jumped from 1.73 for CA to 1.81 for Mg3(VO4)2/MgO/GO@CA film. The thermogravimetric analysis showed three main stages of degradation. The initial temperature started from room temperature to 289 °C with a weight loss of 13%. On the other hand, the second stage started from the final temperature of the first stage and end at 375 °C with a weight loss of 52%. Finally, the last stage was from 375 to 472 °C with 19% weight loss. The obtained results, such as high hydrophilic behavior, high cell viability, surface roughness, and porosity due to the addition of nanoparticles to the CA membrane, all played a significant role in enhancing the biocompatibility and biological activity of the CA membrane. The enhancements in the CA membrane suggest that it can be utilized in drug delivery and wound healing applications.

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Mansha, Muhammad Tamoor, Ayesha Maqbool, Nabeela Nadir, Ali Imran Mallhi, Sehar Arshad, Maira Munir, Fahad Ali Nadeem, Mubashir Ahmad y Aftab Hussain. "Functional Assessment of MGO Nanoparticle Supplementation in an Acute Liver Injury Rat Model". Haya: The Saudi Journal of Life Sciences 8, n.º 11 (2 de diciembre de 2023): 233–34. http://dx.doi.org/10.36348/sjls.2023.v08i11.001.

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Magnesium supplements have been effective for modulating process of bile resistance, decrease oxidative stress and systemic inflammation. Current study was designed to functionally evaluate the MgO nanoparticle supplementation in an acute liver injury rat model. The animals were randomly divided into five groups. All groups were administrated with CCl4 to induce hepatic injury except of negative control group which received only vehicle. CCl4 administration is followed by MgO nanoparticles in the concentration of 150 and 300 mg/kg in low dose and high dose treated group respectively except of standard control group. After 21 days of treatment, the animals were sacrificed to collect blood and liver samples. Serum levels of bilirubin, AST, ALT and ALP were determined. Liver sample was also subjected to RNA isolation by Trizol method followed by the cDNA synthesis and Real Time PCR. In addition, lipid profile was also assessed. The data obtained was analyzed by one way analysis of variance (ANOVA). The results showed that levels of bilirubin, AST, ALT and ALP were significantly elevated in positive control group while MgO treated groups, somehow, had normal ranges of these enzymes. Furthermore, the qPCR results showed that the expression of Farnesoid X receptor (FXR), transcriptional regulator of the bile salt export pump (BSEP) and sodium taurocholate cotransporting polypeptide (NTCP), is reduced in positive control group, while nanoparticles treated groups had normal expression of these genes. In conclusion, our data showed that MgO nanoparticles possess hepatoprotective activity against hepatic injury.

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Al-Fahdawi, Mohamed Qasim, Abdullah Rasedee, Faris AJ Al-Doghachi, Rozita Rosli, Yun Hun Taufiq-Yap y Mothanna Sadiq Al-Qubaisi. "Anticancer palladium-doped magnesia nanoparticles: synthesis, characterization, and in vitro study". Nanomedicine 15, n.º 6 (marzo de 2020): 547–61. http://dx.doi.org/10.2217/nnm-2019-0178.

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Aim: To prepare, physicochemically characterize and determine the anticancer effects of palladium-doped magnesia (Pd/MgO) nanoparticles. Materials & methods: Pd/MgO nanoparticles were prepared by the co-precipitation method from the aqueous solution of Mg(NO3)2.6H2O using K2CO3 and the impregnation of MgO into palladium acetylacetonate. Results: Pd/MgO nanoparticles were between 47 and 70 nm in size, cuboid in shape, and tended to form aggregates. Nanoparticles were more antiproliferative toward cancer than the normal cells. In cancer cells, Pd/MgO nanoparticles induced apoptosis by increasing caspase activities and stimulating cytochrome C release. The anticancer effects of Pd/MgO nanoparticles were accentuated by the upregulation of Bax and p53 and downregulation of Bcl-2 protein expressions. Conclusion: Pd/MgO nanoparticles have potential to be developed as an anticancer compound.

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Arokya, Michael Jenis J. "Characterization of magnesium oxide nanoparticle for water-based drilling mud formulation". i-manager's Journal on Material Science 10, n.º 2 (2022): 1. http://dx.doi.org/10.26634/jms.10.2.19040.

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This research is based on the synthesis and analysis to determine the efficiency and cost effectiveness of nanoparticle materials used in drilling fluid during oilfield exploration process. The study was carried out in the formulation of a waterbased drilling fluid, in which the prepared additives were treated with magnesium oxide (MgO) nanoparticles. The rheological properties of nanoparticle materials, such as flow time, viscosity, shear rate, shear stress, torque difference, and separation of solids and liquids, have been determined. The study also analyzed the fluid loss with respect to time in a manual filter press for low temperature and low pressure versus high pressure and high temperature using filter press hydraulic dead weight assembly in high temperature and high pressure. The nanoparticle used for the study was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffractometer and particle size analyzer. Viscosity parameters were optimized using a multi-speed viscometer, lubricity tester and pH meter at effective concentration, as well as contact time, temperature and pressure changes as a function of concentration. The study suggests the use of MgO nanoparticle as an additive for water-based mud exploration in oilfields.

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Pachiyappan, Jayakaran, Nirmala Gnanansundaram, Selvaraju Sivamani, Naveen Prasad Balakrishna Pillai Sankari, Nachiappan Senthilnathan y Gizachew Assefa Kerga. "Preparation and Characterization of Magnesium Oxide Nanoparticles and Its Application for Photocatalytic Removal of Rhodamine B and Methylene Blue Dyes". Journal of Nanomaterials 2022 (28 de julio de 2022): 1–6. http://dx.doi.org/10.1155/2022/6484573.

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In this research work, MgO nanoparticles were synthesized by a single-step coprecipitation approach using Kappaphycus alvarezii extract as stabilizer. The synthesized MgO nanoparticles exhibit cubic crystal structure, which were confirmed by XRD and FTIR. The purity of MgO nanomaterials was confirmed by P-XRD. The diffraction crests of MgO nanomaterials are in accordance with customary patterns of pure MgO (JCPDS No.00–004-0821). Electron microscopic analysis demonstrated the appearance of MgO nanoflakes. The UV-DRS was used to calculate the optical band gap of MgO nanoparticles and found to be 4.71 eV. MgO nanoparticles have substantial photocatalytic activity for the deterioration of rhodamine B (RhB) and methylene blue (MB) dyes under visible light irradiation. The experimental data fitted first-order kinetics and around >95% degeneration of both dyes was achieved by photocatalysis using synthesized MgO nanoparticles. Thus, the data obtained from this research can effectively be utilized in large-scale industrial applications during wastewater treatments.

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44

Zhao, Yuzhen, Jinqian Li, Yang Yu, Yang Zhao, Zhun Guo, Ruijuan Yao, Jianjing Gao, Yongming Zhang y Dong Wang. "Electro-Optical Characteristics of Polymer Dispersed Liquid Crystal Doped with MgO Nanoparticles". Molecules 27, n.º 21 (26 de octubre de 2022): 7265. http://dx.doi.org/10.3390/molecules27217265.

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In this paper, inorganic oxide MgO nanoparticles-doped polymer dispersed liquid crystal (PDLC) films were made from a mixture of the prepolymer, SLC1717 liquid crystal, and MgO nanoparticles by the polymerization induced phase separation (PIPS) process. To observe the effect of MgO concentration, PDLC was dispersed with 0.2, 0.4, 0.6, and 0.8 wt.% MgO. Electro-optical properties of the films have been investigated using LCD parameter meter and Scanning Electron Microscope (SEM) at room temperature. It is established that MgO nanoparticles affect the microstructure of PDLC films significantly because of the formed agglomerates of MgO nanoparticles. Results show an improvement in the electro-optical properties and a decrease in the driving voltage for doped systems with MgO nanoparticles. When the doping amount of MgO is 0.8 wt.%, the threshold voltage (Vth) is reduced to about 7.5 V. Therefore, MgO-doped PDLC is expected to become an excellent choice in the field of energy-saving.

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45

Shruthi, K. N., V. Ramaraja Varma, Mohan Kumar, Sushma y Ganesh Sanjeev. "Structural and Optical Properties of PMMA-MgO Nanocomposite Film". IOP Conference Series: Materials Science and Engineering 1300, n.º 1 (1 de abril de 2024): 012020. http://dx.doi.org/10.1088/1757-899x/1300/1/012020.

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Abstract This study investigates the structural, morphological, and optical properties of poly(methyl methacrylate) (PMMA) films incorporated with magnesium oxide (MgO) nanoparticles. The PMMA-MgO polymer nanocomposite (PNC) films were fabricated via solution casting method using varying weight percentages (1-4 wt%) of MgO nanoparticles. X-ray diffraction analysis confirmed the integration of MgO nanofillers in the PMMA matrix. Fourier transform infrared spectroscopy revealed interactions between PMMA and MgO nanoparticles. Atomic force microscopy demonstrated increased surface roughness in PNC films with higher MgO loading. Optical characterization using UV-visible spectroscopy showed enhanced absorption in the UV region and a noticeable peak at 280 nm due to MgO nanoparticles. The refractive index of PMMA-MgO PNCs increased with rising MgO content while the optical bandgap marginally decreased. The study highlights the potential of PMMA-MgO PNC films for advanced optoelectronic applications requiring high optical transparency and tuneable refractive index.

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46

Sadeq, Jawaher Abdulelah, Aseel Mustafa Abdul Majeed, Randa Kamel Hussain y Salim F. Bamsaoud. "Synthesis and Characterization of PMMA/HAP/MgO Nanocomposite as an Antibacterial Activity for Dental Applications". Al-Mustansiriyah Journal of Science 34, n.º 2 (30 de junio de 2023): 129–34. http://dx.doi.org/10.23851/mjs.v34i2.1330.

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The current work focuses on the preparation of magnesium oxide nanoparticles using aqueous magnesium chloride salts and sodium hydroxide powder by a simple chemical precipitation method and at an annealing temperature of 700 °C for 6 hours. The structural and morphological properties of the magnesium oxide nanoparticles were investigated using X-ray diffraction (XRD). Polycrystalline cube and using the Scherer equation showed a crystalline size of 17.23 nm. EDS analyzes showed high purity. Scanning electron microscopy (FESEM) showed the spherical shape of the magnesium oxide particles. With particle size within the range (65-185) nm. While a (PMMA)-HAP nanocomposite was synthesized. -MgO) for use in dental applications such as fillings and dentures. A nanocomposite (PMMA-HAP-MgO) was manufactured by manual molding method by strengthening the poly methyl methacrylate polymer with certain weight ratios(1%,5%,and 10%) from a mixture of nano powder where the added ratios were (99%PMMA-1%HAP,95%PMMA-7.4%HAP-0.3%MgO,and 90%PMMA-9.4%HAP-0.3%MgO). The topographical properties (surface roughness) of the nanocomposite samples were studied by testing them with an atomic force microscope. The results showed an increase in the value of pure PMMA, where the use of nanoparticle filler by 5% (4.7% HAP -0.3% MgO) affected both the roughness and the root mean square ratio of the distribution of nanoparticles on the surface of the composite and the shape of the particles led to a roughness more than the polymer pure. The antibacterial activity of the polymeric overlay was examined on the bacteria that cause dental caries for (Streptococcus mutans), where the zone of inhibition were (1 mm, 2 mm, 5 mm) for the nanocomposite and no activity for pure PMMA.

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47

Amini, Maryam, Alireza Vejdani Noghreiyan, Zahra Dehghani y Mohammad Hossein Majles Ara. "Effect of gamma irradiation on the structure characteristics and mass attenuation coefficient of MgO nanoparticles". Radiochimica Acta 106, n.º 10 (25 de octubre de 2018): 857–64. http://dx.doi.org/10.1515/ract-2018-2924.

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Abstract In this work, the structure properties and mass attenuation coefficient of MgO nanoparticles were studied before and after gamma irradiation. The as-synthesized samples of MgO nanoparticles by sol–gel method were analyzed by XRD which suggested the double phase; cubic and hexagonal structures of the material. Crystal defects produced in the cubic and hexagonal lattice were studied before and after exposure to 20 kGy gamma irradiation in order to investigate the changes in the structure properties and mass attenuation coefficients of MgO nanoparticles. XRD data of gamma-irradiated and non-irradiated MgO nanoparticles show that the crystal size of MgO nanoparticles increases after radiation exposure. SEM images after irradiation indicated significant changes in the morphology. The UV-Visible absorption spectra of the nanoparticles were taken and the results of optical band gap of the MgO nanoparticles before and after irradiation show that the value of band gap has changed slightly due to gamma irradiation. The results of comparing experimental values of mass attenuation coefficient for non-irradiated MgO nanoparticles with theoretical values of mass attenuation coefficient for MgO microparticles calculated using the NIST XCOM show that the mass attenuation coefficient not only depends on the effective atomic number but also depends on the size of the particles. Also, it is observed that the mass attenuation coefficient of MgO nanoparticles decreases after the irradiation which shows that by increasing the size of the nanoparticles, the mass attenuation coefficient decreases. It could be because the cross-section of photon interaction with materials depends on the surface to volume ratio of nanoparticles. The experimental results also show that the linear and mass attenuation coefficient of MgO nanoparticles decrease with increasing the photon energy.

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48

Khatua, Ashapurna, Kajal Kumari, Deepak Khatak, Annesha Roy, Neelima Bhatt, Bernard Paul, Aparupa Naik et al. "Synthesis and Spectral Characterisation of Fabricated Cerium-Doped Magnesium Oxide Nanoparticles: Evaluation of the Antimicrobial Potential and Its Membranolytic Activity through Large Unilamellar Vesicles". Journal of Functional Biomaterials 14, n.º 2 (17 de febrero de 2023): 112. http://dx.doi.org/10.3390/jfb14020112.

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Considerable attention has been given to Magnesium oxide nanoparticles lately due to their antimicrobial potential, low toxicity to humans, high thermal stability, biocompatibility, and low cost of production. However, their successful transformation into sustainable drugs is limited due to their low membrane permeability, which reduces their bioavailability in target cells. Herein we propose Cerium-doped magnesium oxide nanoparticles (MgOCeNPs) as a powerful solution to above mentioned limitations and are compared with MgO NPs for their membrane permeability and antimicrobial activity. Both pure and Ce-doped were characterized by various spectroscopic and microscopic techniques, in which an X-ray diffraction (XRD) examination reveals the lattice patterns for doped nanoparticles. Furthermore, Atomic Force Microscopy (AFM) revealed the three-dimensional (3D) structure and height of the nanoparticle. The crystal structure (FCC) of MgO did not change with Ce doping. However, microstructural properties like lattice parameter, crystallite size and biological activity of MgO significantly changed with Ce doping. In order to evaluate the antimicrobial potential of MgOCeNPs in comparison to MgO NPs and to understand the underlying mechanisms, the antibacterial activity was investigated against human pathogenic bacteria E. coli and P. aeruginosa, and antifungal activity against THY-1, a fungal strain. MgOCeNPs were studied by several methods, which resulted in a strong antibacterial and antifungal activity in the form of an elevated zone of inhibition, reduced growth curve, lower minimum inhibitory concentration (MIC80) and enhanced cytotoxicity in both bacterial and fungal strain as compared to MgO nanoparticles. The study of the growth curve showed early and prolonged stationary phase and early decline log phase. Both bacterial and fungal strains showed dose-dependent cytotoxicity with enhancement in intracellular reactive oxygen species (ROS) generation and formation of pores in the membrane when interacting with egg-phosphatidylcholine model Large Unilamellar Vesicles (LUVs). The proposed mechanism of MgOCeNPs toxicity evidently is membranolytic activity and induction of ROS production, which may cause oxidative stress-mediated cytotoxicity. These results confirmed that MgOCeNPs are a novel and very potent antimicrobial agent with a great promise of controlling and treating other microbes.

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Dhage, S. Sagar, D. P. Biradar, Y. R. Aladakatti, S. S. Chandashekhar y Ravikumar Hosamani. "Green Synthesis and Characterization of Magnesium Oxide Nanoparticles from Leaf Extracts of Amaranthus retroflexus and Azadirachta indica". International Journal of Environment and Climate Change 13, n.º 9 (29 de junio de 2023): 214–19. http://dx.doi.org/10.9734/ijecc/2023/v13i92225.

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Among plant extracts, neem leaf extract was found effective for successful synthesis of MgO nanoparticles. The main phytochemicals present in neem leaf extract acts as reducing and capping agents for synthesis of MgO nanoparticles. The bio reduced MgO nanoparticles were characterized by using surface plasmon resonance analysis (UV–Vis spectroscopy), particle size and distribution analysis (PSA), surface morphology analysis (SEM) and elemental distribution analysis (EDX). The UV–Vis spectral analysis confirmed that the maximum absorption at 279 nm range corresponds to the intrinsic band gap of MgO nanoparticles. Particle size analyzer confirmed synthesized particles are of nanoscale i.e., 48.1 nm. SEM images confirmed synthesized nanoparticles were found to be relatively oval shaped and EDX confirmed peak is of MgO nanoparticles. This is a simple and effective method which could be an alternative for chemical and physical methods for the large-scale production of MgO nanoparticles.

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M, Mylarappa, Rekha S, Kantharaju S, Chandruvasan S y Shravana K N. "Synthesis and Characterization of ZnO and MgO Nanoparticles through Green Approach and Their Antioxidant Properties". ECS Transactions 107, n.º 1 (24 de abril de 2022): 689–95. http://dx.doi.org/10.1149/10701.0689ecst.

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The present work focus on the synthesis and structural characterization of ZnO and MgO Nanoparticles using geranium leaves extract as reducing agent through green approach. The prepared ZnO and MgO Nanoparticles were characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM).The elemental composition of ZnO and MgO Nanoparticles were investigated using Energy Dispersive X-ray analysis (EDAX). Based on the XRD data, the ZnO and MgO particles were measured to be 64 and 42 nanometers in size, respectively. The DPPH method was used to further test the antioxidant property of the synthesized Nanoparticles. MgO and ZnO were both found to be excellent free radical scavengers, as measured by their DPPH scavenging activities. The antioxidant property of MgO is enhanced when compared to ZnO nanoparticles.

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