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Articles de revues sur le sujet « Calcium hydroxide nanoparticles »

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Auteur : Grafiati
Publié le 10 mars 2023

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1

V., Dr Abirami, Dr A. Shafie Ahamed, Dr Bhavani S. et Dr Rajaraman G. « Comparative evaluation of anti-bacterial efficacy of silver nanoparticle, nanoparticle calcium hydroxide and calcium hydroxide against enterococcus faecalis biofilm- An In vitro study ». International Journal of Dental Research 6, no 2 (27 juin 2018) : 57. http://dx.doi.org/10.14419/ijdr.v6i2.13743.

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The purpose of this study was to evaluate the antibacterial efficacy of silver Nanoparticles, Nanoparticle calcium hydroxide and calcium hydroxide as intracanal medicament against Enterococcus faecalis bio film formed on root dentinThe Minimal inhibitory concentration test and Anti microbial test were conducted for silver nanoparticle, Nanoparticle calcium hydroxide. Teeth were inoculated with E.faecalis strains for 1month to establish a standard mono species bio film model. Biofilm formation is confirmed using SEM. The intracanal medicaments were placed inside the canal and colony forming units (CFU) were counted before and 7 days later the placement of the medicament.MIC for AGNP is 25µg/200µl and for NCH is 12.5µg/200µl. The Antimicrobial test conducted shows zone of inhibition about 11mm and 14mm for AGNP and NCH respectively at 500µg. The calcium hydroxides do not show any antibacterial activity at this concentration. In antibacterial efficacy test using CFU count, the AGNP and NCH shows 75% and 61% of antibacterial efficacy respectively whereas calcium hydroxide has exhibited just 11% of antibacterial efficacy. Silver Nanoparticles and nanoparticle calcium hydroxide had statistically significant difference in the reduction in the number of colonies when compared to calcium hydroxide by post hoc turkey test and p-value of <0.01 was considered as significant in this study.
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Nasim, Iffat. « Effect of nanoparticle based intra-canal medicaments on root dentin micro-hardness ». Bioinformation 18, no 3 (31 mars 2022) : 226–30. http://dx.doi.org/10.6026/97320630018226.

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Complete eradication of bacterial infection from the root canal with minimum or no effect on the microhardness of the dentin is desirable for the success of endodontic treatment. The effect of nanoparticle based intracanal medicaments on the root dentine microhardness was assessed. The medicaments used were combination of calcium hydroxide - silver nanoparticles, Combination of graphene oxide - silver nanoparticles, Calcium hydroxide and a control group. Vickers hardness value were evaluated and compared at coronal, middle and apical third level. Graphene oxide - silver nanoparticles based intracanal medicament showed least effect on the microhardness of the root dentin compared to calcium hydroxide and calcium hydroxide combined with silver nanoparticle based intracanal medicaments.
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Riaz, Zudia, Muhammad Raza, Amjad Hanif, Beenish Haider, Sadia Akram et Shamayem Safdar. « Antibacterial Efficacy of Silver Nanoparticles Impregnated Calcium Hydroxide : An in Vitro Study ». Journal of the Pakistan Dental Association 31, no 01 (4 avril 2022) : 1–4. http://dx.doi.org/10.25301/jpda.311.1.

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OBJECTIVE: To compare the in-vitro antibacterial effectiveness in terms of enterococcus faecalis elimination of conventional unmodified calcium hydroxide paste with an experimental calcium hydroxide impregnated with 1% silver nanoparticles. METHODOLOGY: This in vitro study was conducted during the period July 2019 - January 2020 at Materials Research Laboratory, Centralized Resource Laboratory (University of Peshawar) and Pathology Laboratory (Peshawar Medical College). Sixty human premolar teeth having single root with mature apices were obtained. These were distributed into two groups randomly (n=30); experimental group for testing the antibacterial efficacy of calcium hydroxide impregnated with 0.1% by weight silver nanoparticles and the other was used as a control group for testing the antibacterial efficacy of unmodified calcium hydroxide. Dentine specimens (size 4 x 4x 1mm) were prepared from the teeth using slow speed cutting saw machine. Smear layer was removed with EDTA. Specimens were autoclaved to sterilize them. Then each specimen was contaminated with enterococcus faecalis and incubated anaerobically for 24 hours at 37?C. After the application of medicaments, the zone of inhibition was measured and number of viable bacteria were determined using SEM. Statistical significance was calculated using t-test. p<0.05 was taken as significant. RESULTS: After the application of medicament, the zone of inhibition was greater (9.63mm) in experimental group when compared to control group (4mm) (p<0.001). Number of viable bacteria before application of medicament were 239 and 208 while after application of medicament reduced to 90 and 54 in control and experimental groups respectively (p<0.001). CONCLUSION: The addition of silver nanoparticles to calcium hydroxide significantly enhanced its potential to eliminate biofilm of enterococcus faecalis on dentin specimens. KEYWORDS: Silver nanoparticles, Calcium hydroxide, Root canal infections, Root canal medicament.
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Kroftová, Klára, David Škoda, Ivo Kuřitka et Jan Kubát. « TECHNOLOGY OF PREPARATION OF BARIUM AND MAGNESIUM HYDROXIDE NANODISPERSION AND POSSIBILITIES OF THEIR USE IN MONUMENT CARE ». Acta Polytechnica CTU Proceedings 21 (21 mars 2019) : 21–23. http://dx.doi.org/10.14311/app.2019.21.0021.

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An application of hydroxide nanoparticles in preservation of cultural heritage attracted great interest. The nanodispersions of calcium, magnesium or barium hydroxides exhibit high performance in consolidation abilities. In this work we focused on preparation of magnesium and barium hydroxide nanoparticles. For the synthetic procedure we used acetate precursors and sodium hydroxide. Obtained particles were dispersed in 2-propanol. Hydroxide nanoparticles were characterized by powder X-Ray diffraction, infrared spectroscopy and scanning electron microscopy. It was observed that smaller particles were achieved in case of magnesium hydroxide. Presented work demonstrates that this reaction procedure can be applied for preparation of materials used in cultural heritage preservation.
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Nasim, Iffat. « Antioxidant and anti-inflammatory activity of a nanoparticle based intracanal drugs ». Bioinformation 18, no 5 (31 mai 2022) : 450–54. http://dx.doi.org/10.6026/97320630018450.

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The most common intracanal medication is calcium hydroxide. Its efficacy can be affected by a number of factors, including pH, serum proteins, collagen, and dentin. It's also ineffective against E. faecalis and fungus, lacks an anti-inflammatory component, and has mixed reviews when it comes to pain relief. Natural alternatives to synthetic intracanal medication are being researched at the moment. We evaluated the antioxidant and anti-inflammatory activity of green synthesized silver nanoparticle based intracanal medicaments. Silver nanoparticles integrated into calcium hydroxide and graphene oxide nanoparticles were the experimental groups and Calcium hydroxide served as the control. Antioxidant activity was determined using the DPPH and Nitric oxide assays, while anti-inflammatory activity was determined using the protein denaturation and Xanthine Oxidase Inhibition assays. Both experimental groups had higher antioxidant activity than the control group based on DPPH and Nitric oxide assays. Calcium hydroxide combined with silver nanoparticles demonstrated improved anti-inflammatory efficacy in a protein denaturation and Xanthine oxidase inhibition assay. Within the constraints of an in vitro study, it can be concluded that intracanal medicaments containing silver nanoparticles can be employed efficiently during root canal preparation. In comparison to standard calcium hydroxide-based intracanal medicaments, it has effective antioxidant and anti-inflammatory effects.
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Yong, Lee Li, S. V. A. D. Namal Jayasanka Perera, Agusril Syamsir, Endene Emmanuel, Suvash Chandra Paul et Vivi Anggraini. « Stabilization of a Residual Soil Using Calcium and Magnesium Hydroxide Nanoparticles : A Quick Precipitation Method ». Applied Sciences 9, no 20 (15 octobre 2019) : 4325. http://dx.doi.org/10.3390/app9204325.

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The current study examines the potential of using calcium and magnesium hydroxide nanoparticles synthetized through a quick precipitation method as soil stabilizers for improving the engineering properties of tropical residual soil. The engineering properties of untreated and nanoparticles-treated soil were studied by carrying out a series of geotechnical tests including compaction, Atterberg limits, falling head permeability, and unconfined compressive strength (UCS). The stabilization mechanisms associated with soil–chemical reactions were further explored by performing microstructural analyses such as x-ray diffraction (XRD), variable-pressure scanning electron microscope (VP-SEM), and energy-dispersive x-ray spectroscopy (EDX). The findings revealed that the calcium hydroxide and magnesium hydroxide nanoparticles improved the geotechnical properties of residual soils in terms of reduced hydraulic conductivity and increased UCS. The percentage reduction of the hydraulic conductivity of magnesium and calcium hydroxide nanoparticles-treated soils compared to untreated soil after seven weeks of permeation were 85.14% and 98.70%, respectively. The magnesium and calcium hydroxide nanoparticles-treated soils subjected to 14 days of curing recorded a percentage increase in the UCS of 148.05% and 180.17%, respectively compared to untreated soil. Hence, it can be concluded that both magnesium and calcium hydroxide nanoparticles can be effectively utilized as environmental-friendly stabilizers.
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Tanomaru-Filho, Mario, Juliane M. Guerreiro-Tanomaru, Gisele Faria, Alana Souza Aguiar et Renato Toledo Leonardo. « Antimicrobial Activity and pH of Calcium Hydroxide and Zinc Oxide Nanoparticles Intracanal Medication and Association with Chlorhexidine ». Journal of Contemporary Dental Practice 16, no 8 (2015) : 624–29. http://dx.doi.org/10.5005/jp-journals-10024-1732.

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ABSTRACT Aim To evaluate pH and antibacterial activity of pastes with calcium hydroxide [Ca(OH)2] and zinc oxide (ZnO) microparticles (micro) or nanoparticles (nano) and association with 0.4% chlorhexidine against Enterococcus faecalis. Materials and methods The following pastes were analyzed: Ca(OH)2/ZnO micro, (2) Ca(OH)2/ZnO nano, (3) Ca(OH)2/ ZnO micro + 0.4% chlorhexidine, (4) Ca(OH)2/ZnO nano + 0.4% chlorhexidine. Antibacterial activity against E. faecalis was evaluated by agar diffusion test. The direct contact test on planktonic cells of E. faecalis was performed for 30 and 60 seconds. Root canals from bovine teeth were filled with the pastes and pH was evaluated after 1, 7, 14, 21, 30 and 60 days. The data obtained were submitted to the statistical tests analysis of variance (ANOVA) and Tukey or Kruskal-Wallis and Dunn test, with a 5% significance level. Results Calcium hydroxide and zinc oxide nano, and the pastes with 0.4% chlorhexidine were more effective in agar diffusion test. In the direct contact test, the pastes with chlorhexidine showed the highest effect after 30 seconds. All pastes eliminated E. faecalis after 60 seconds. All pastes promoted an increase in pH. The highest increase in pH was observed with nanoparticle medications after 1 and 7 days (p < 0.05). After this period, the pastes presented similar pH increase. Conclusion It was concluded that calcium hydroxide and zinc oxide nanoparticles promoted greater initial alkalinization. The antimicrobial activity of the pastes against E. faecalis is favored by the association with chlorhexidine. Clinical significance Although nanoparticles of calcium hydroxide and zinc oxide promoted antibacterial effect, the activity against E. faecalis is favored by association with chlorhexidine. How to cite this article Aguiar AS, Guerreiro-Tanomaru JM, Faria G, Leonardo RT, Tanomaru-Filho M. Antimicrobial Activity and pH of Calcium Hydroxide and Zinc Oxide Nanoparticles Intracanal Medication and Association with Chlorhexidine. J Contemp Dent Pract 2015;16(8):624-629.
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Taglieri, Giuliana, Valeria Daniele et Ludovico Macera. « Synthesizing Alkaline Earth Metal Hydroxides Nanoparticles through an Innovative, Single-Step and Eco-Friendly Method ». Solid State Phenomena 286 (janvier 2019) : 3–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.286.3.

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The objective of this paper is to introduce a patented and eco-friendly method to synthesize aqueous suspension of all types of alkaline-earth metal hydroxides nanoparticles (NPs). This method is based on an ion exchange process; the exchange takes place at ambient temperature/pressure, starts from cheap or renewable reagents and, in one single step, results in the creation of the crystalline desired nanoparticles in only a few minutes. In terms of structural and morphological features, the synthesized nanoparticles are characterized by means of XRD-Rietveld refinement, FTIR, and TEM. In particular, we obtained pure and crystalline magnesium and calcium hydroxide suspensions, showing the typical brucite crystal structure with a hexagonal lamellar morphology and dimensions generally <100 nm. With respect to the strontium and barium hydroxide suspensions, we observed different kinds of hydroxides (either anhydrous and hydrate forms), characterized by orthorhombic or monoclinic crystal lattices with rod-like nanostructured morphologies. Despite the different morphologies, all synthesized nanoparticles appear constituted by a superimposition of primary nanoparticles, of dimensions ranging from a few to 15 nm, correlated to the increase in the atomic number of the alkaline earth metal.
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Atchudan, Raji, Suguna Perumal, Jin Joo et Yong Rok Lee. « Synthesis and Characterization of Monodispersed Spherical Calcium Oxide and Calcium Carbonate Nanoparticles via Simple Pyrolysis ». Nanomaterials 12, no 14 (15 juillet 2022) : 2424. http://dx.doi.org/10.3390/nano12142424.

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In this study, calcium carbonate nanoparticles (CCNPs) and calcium oxide nanoparticles (CONPs) are synthesized by the carbonization/calcination of calcium oleate. CONPs are an essential inorganic material, and they are used as catalysts and as effective chemisorbents for toxic gases. CCNPs are widely used in plastics, printing ink, and medicines. Here, calcium oleate is used as a starting material for the preparation of CCNPs and CONPs. This calcium oleate is prepared from calcium hydroxide and oleic acid in ethanol under mild reflux conditions. The effect of the calcination temperature of calcium oleate is examined during the synthesis of CCNPs and CONPs. By simple carbonization/calcination, calcite-type CCNPs and CONPs are prepared at <550 °C and >600 °C, respectively. The synthesized nanomaterials are analyzed by various physicochemical characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA) with derivative thermogravimetry (DTG), and scanning electron microscopy (SEM) with energy dispersive X-ray analysis. An X-ray diffractometer and the Scherrer formula are used to analyze the crystalline phase and crystallite size of prepared nanoparticles. TGA techniques confirm the thermal stability of the calcium oleate, CCNPs, and CONPs. The SEM analysis illustrates the dispersive behavior and cubic/spherical morphologies of CCNPs/CONPs. Furthermore, the obtained results are compared to the CCNP and CONP samples prepared using calcium hydroxide. As a result, the carbonization/calcination of calcium oleate produces monodispersed CONPs, which are then compared to the CONPs from calcium hydroxide. Additionally, from calcium oleate, CONPs can be prepared on a large scale in a cheap, convenient way, using simple equipment which can be applied in various applications.
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Nugroho, Juni Jekti, et Fanny Ayu Elfira. « Antibacterial effectiveness of moringa leaf (Moringa oleifera) nanoparticle paste with different concentration against Enterococcus faecalis ». Makassar Dental Journal 11, no 1 (1 avril 2022) : 6–8. http://dx.doi.org/10.35856/mdj.v11i1.497.

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Background: Endodontic is a treatment that aims to eliminate bacteria from the root canal system. One of the bacteria that causes root canal treatment failure is Enterococcus faecalis. Chemomechanical preparation and root canal irrigation are not sufficient to eliminate bacteria completely, so root canal medication is necessary to make it more efficient. Moringa leaves contain tannins, flavonoids and saponins which have antibacterial properties. Objective: To determine whether moringa leaf nanoparticle paste had antibacterial effectiveness against the bacterium E.faecalis. Method: Experimental laboratory with posttest with control group design with Kirby-Bauer method. The sample consisted of moringa leaf nanoparticles with concentrations of 1% and 2.5%, calcium hydroxide and aquadest with each of them being repeated 3 times. The diameter of the inhibition zone was de-termined based on the inhibitory ability of the bacteria saturated on MHA agar media. Results: the result showed that the ave-rage diameter of the inhibition zone of moringa leaf nanoparticle paste with concentrations of 1% was 8.48 mm, 2.5% was 9.17 mm and calcium hydroxide was 10.2 mm. Data processing showed that the 2.5% moringa leaf nanoparticle paste group had the same antibacterial effect as the calcium hydroxide group. Conclusion: Moringa leaf nanoparticle paste (Moringa oleifera) with concentrations of 1% and 2.5% was quite effective in inhibiting the growth of E.faecalis.
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Faridi-Majidi, Reza, Naser Sharifi-Sanjani et Mohammad Madani. « Synthesis of Calcium Carbonate-Polyethylene Oxide Hybrid Nanofibers Through In-Situ Electrospinning ». Journal of Nanoscience and Nanotechnology 8, no 5 (1 mai 2008) : 2627–31. http://dx.doi.org/10.1166/jnn.2008.18295.

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In this work, calcium carbonate nanoparticles-polyethylene oxide nanofibers as organic–inorganic hybrid were prepared via in-situ electrospinning. Thus, electrospinning of polyethylene oxide solution saturated with calcium hydroxide was carried out in gaseous carbon dioxide atmosphere. Transmission electron microscopy (TEM) showed that calcium carbonate (CaCO3) nanoparticles were formed on the produced nanofibers of 200–300 nm in diameter. The existence of the formed CaCO3 was also proved by thermogravimetric analysis (TGA) via loss of gaseous CO2 related to the decomposition of CaCO3 at about 500–840 °C. X-ray diffraction (XRD) analysis of the nanofibers showed that the formed CaCO3 nanoparticles have vaterite morphology. DSC analysis was used to determine melting point and to calculate the crystallinity of the produced hybrid nanofibers. The TEM, TGA, XRD and DSC analyses results of the obtained nanofibers were compared with those of the nanofibers produced in electrospinning of pure polyethylene oxide solution and polyethylene oxide solution having calcium hydroxide, both in air.
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Fan, Huiming, Helong Song, Yuqing Rao, Xueqin Wang, Guanyu Zhu, Qinchi Wang, Yanan Qi, Gaopeng Zhu, Da Gao et Jianan Liu. « Effect of calcium hydroxide concentration and stirring rate on the crystallization of the calcium carbonate on the surface of fly ash ». BioResources 13, no 3 (31 juillet 2018) : 7017–25. http://dx.doi.org/10.15376/biores.13.3.7017-7025.

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To improve the whiteness of fly ash, fly ash was prepared using calcium hydroxide, water, and carbon dioxide as the reaction system to coat calcium carbonate crystals on the surface of the fly ash. This study investigated the effect of the calcium hydroxide content and stirring rate on the crystallization of the calcium carbonate on the fly ash surface. The results showed that the calcium carbonate nanoparticles prepared with a 7% calcium hydroxide concentration and stirring rate of 500 rpm were coated on the surface of the fly ash, and the whiteness of the modified fly ash reached a maximum of 59.7% ISO. The microscopic process of heterogeneous nucleation of calcium carbonate and the LaMer model were explored to explain the influence of the precursor reactant concentration and stirring rate on the nucleation and growth of the crystal.
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Rodriguez-Navarro, Carlos, Amelia Suzuki et Encarnacion Ruiz-Agudo. « Alcohol Dispersions of Calcium Hydroxide Nanoparticles for Stone Conservation ». Langmuir 29, no 36 (26 août 2013) : 11457–70. http://dx.doi.org/10.1021/la4017728.

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Hassan, Mohammad, Osama . Elfeky et Nehad . Ahmed. « Calcium hydroxide nanoparticles for deacidification of canvas oil paintings ». مجلة کلیة الآثار . جامعة القاهرة 8, no 2020 (1 janvier 2020) : 47–62. http://dx.doi.org/10.21608/jarch.2020.102356.

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L. Hassan, Mohammad, Osama Elfeky et Nehad Ahmed. « Calcium hydroxide nanoparticles for deacidification of canvas oil paintings ». مجلة کلیة الآثار . جامعة القاهرة 8, no 2020 (30 juin 2020) : 19–34. http://dx.doi.org/10.21608/jarch.2020.99381.

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Chatzigrigoriou, Aikaterini, Ioannis Karapanagiotis et Ioannis Poulios. « Superhydrophobic Coatings Based on Siloxane Resin and Calcium Hydroxide Nanoparticles for Marble Protection ». Coatings 10, no 4 (1 avril 2020) : 334. http://dx.doi.org/10.3390/coatings10040334.

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Calcium hydroxide (Ca(OH2)) nanoparticles are produced following an easy, ion exchange process. The produced nanoparticles are characterized using transmission electron microscopy (TEM) and Fourier- transform infrared spectroscopy (FTIR) and are then dispersed in an aqueous emulsion of silanes/siloxanes. The dispersions are sprayed on marble and the surface structures of the deposited coatings are revealed using scanning electron microscopy (SEM). By adjusting the nanoparticle concentration, the coated marble obtains superhydrophobic and water repellent properties, as evidenced by the high static contact angles of water drops (> 150°) and the low sliding angles (< 10°). Because Ca(OH)2 is chemically compatible with limestone-like rocks, which are the most common stones found in buildings and objects of the cultural heritage, the produced composite coatings have the potential to be used for conservation purposes. For comparison, the wetting properties of another superhydrophobic and water repellent coating composed of the same siloxane material and silica (SiO2) nanoparticles, which were commonly used in several previously published reports, were investigated. The suggested siloxane+Ca(OH)2 composite coating offers good protection against water penetration by capillarity and has a small effect on the aesthetic appearance of marble, according to colorimetric measurements.
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Camerini, Rachel, Giovanna Poggi, Francesca Ridi et Piero Baglioni. « The kinetic of calcium silicate hydrate formation from silica and calcium hydroxide nanoparticles ». Journal of Colloid and Interface Science 605 (janvier 2022) : 33–43. http://dx.doi.org/10.1016/j.jcis.2021.06.168.

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Karthik, K., S. Dhanuskodi, C. Gobinath, S. Prabukumar et S. Sivaramakrishnan. « Dielectric and antibacterial studies of microwave assisted calcium hydroxide nanoparticles ». Journal of Materials Science : Materials in Electronics 28, no 21 (22 juillet 2017) : 16509–18. http://dx.doi.org/10.1007/s10854-017-7563-5.

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Lopez-Arce, Paula, et Ainara Zornoza-Indart. « Carbonation acceleration of calcium hydroxide nanoparticles : induced by yeast fermentation ». Applied Physics A 120, no 4 (16 juillet 2015) : 1475–95. http://dx.doi.org/10.1007/s00339-015-9341-7.

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Darroudi, Majid, Maryam Bagherpour, Hasan Ali Hosseini et Mahmoud Ebrahimi. « Biopolymer-assisted green synthesis and characterization of calcium hydroxide nanoparticles ». Ceramics International 42, no 3 (février 2016) : 3816–19. http://dx.doi.org/10.1016/j.ceramint.2015.11.045.

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Zhang, Mei Mei, Hong Shi Zhao, Hong Liu, Jian An Liu, Xiu Xiu Han et Wen He. « A Novel Mixed Hydroxide Method for Hydroxyapatite Preparation ». Advanced Materials Research 152-153 (octobre 2010) : 1399–403. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.1399.

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Hydroxyapatite(HAP) nanoparticles were synthesized by a mixed hydroxide method using calcium nitrate tetrahydrate[Ca(NO3)24H2O] and phosphoric pentoxide(P2O5) as raw materials. The synthesized nanoparticles were analyzed by x-ray diffraction (XRD), infrared spectroscopy (IR) and transmission electron microscopy (TEM) methods. The effects of reaction temperature, time and concentration of reactants on the microstructure of the nano-particles have been discussed. The results show that the hydroxyapatite particles synthesized have features of uniform morphology, pure phase and well crystallized nano size. The particle size is in the range of 30-200 nm.
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Giorgi, Rodorico, Moira Ambrosi, Nicola Toccafondi et Piero Baglioni. « Nanoparticles for Cultural Heritage Conservation : Calcium and Barium Hydroxide Nanoparticles for Wall Painting Consolidation ». Chemistry - A European Journal 16, no 31 (23 juillet 2010) : 9374–82. http://dx.doi.org/10.1002/chem.201001443.

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Lungkapinth, P., et P. Louwakul. « Reduction of Endotoxin from Human Root Canals by Calcium Hydroxide Nanoparticles ». IOP Conference Series : Materials Science and Engineering 526 (8 août 2019) : 012020. http://dx.doi.org/10.1088/1757-899x/526/1/012020.

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Barros, Amanda Diniz, Lêda Christiane de F. Lopes Lucena et Daniel Beserra Costa. « Rheological properties of hydroxide and calcium oxide nanoparticles in asphalt binder ». Petroleum Science and Technology 35, no 7 (3 avril 2017) : 738–45. http://dx.doi.org/10.1080/10916466.2016.1252774.

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GUERREIRO-TANOMARU, Juliane Maria, Alana Priscila SOUZA AGUIAR, Gisselle Moraima CHÁVEZ-ANDRADE, Maria Inês Basso BERNARDI et Mário TANOMARU-FILHO. « Antibacterial activity of intracanal medications based on calcium hydroxide and zinc oxide micro- or nanoparticles : an ex vivo study ». Revista de Odontologia da UNESP 46, no 3 (29 mai 2017) : 153–57. http://dx.doi.org/10.1590/1807-2577.22816.

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Abstract Introduction Nanoparticles and associations to calcium hydroxide can be used to increase antimicrobial activity. Objective To evaluate antibacterial activity against Enterococcus faecalis and pH of intracanal medications (IM) based on calcium hydroxide (CH) and zinc oxide (ZnO) micro- or nanoparticles, and their association with 0.4% chlorhexidine (CHX). Material and method Root canals from single-rooted human teeth were inoculated and incubated for 21 days. After sample (S1), the root canals were filled with the medications for 7 days and samples were collected immediately after medication (S2) and 7 days later (S3). Counting of CFU mL-1 was performed. Polyethylene tubes filled with the medications were used for the pH evaluation after 3, 7, 14 and 28 days. Data were submitted to ANOVA and Tukey tests (p<0.05). Result All IM promoted elimination of E. faecalis immediately after medication (S2). All the pastes promoted a similar pH increase. Conclusion CH/ZnO micro- or nanoparticles associated with CHX promoted greater bacterial reduction in the root canals and similar pH.
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Vu, Hong, Mohd Khan, Ramakrishna Chilakala, Tuan Lai, Thriveni Thenepalli, Ji Ahn, Dong Park et Jeongyun Kim. « Utilization of Lime Mud Waste from Paper Mills for Efficient Phosphorus Removal ». Sustainability 11, no 6 (13 mars 2019) : 1524. http://dx.doi.org/10.3390/su11061524.

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In this study, we utilized lime mud waste from paper mills to synthesize calcium hydroxide (Ca(OH)2) nanoparticles (NPs) and investigate their application for the removal of phosphorus from aqueous solution. The NPs, composed of green portlandite with hexagonal shape, were successfully produced using a precipitation method at moderately high temperature. The crystal structure and characterization of the prepared Ca(OH)2 nanoparticles were analyzed by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. The effects of Ca(OH)2 NP dosage and contact time on removal of phosphorus were also investigated. The results show that the green portlandite NPs can effectively remove phosphorus from aqueous solution. The phosphorus removal efficiencies within 10 min are 53%, 72%, 78%, 98%, and 100% with the different mass ratios of Ca(OH)2 NPs/phosphorus (CNPs/P) of 2.2, 3.5, 4.4, 5.3, and 6.2, respectively. Due to the efficient phosphorus removal, the calcium hydroxide nanoparticles (CNPs) could be a potential candidate for this application in domestic or industrial wastewater treatment.
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Hassan, Nermine, Alaa Diab et Geraldine Ahmed. « Post-operative Pain and Antibacterial Efficacy of Silver Nanoparticles Formulations Intracanal Medication : A Randomized Controlled Clinical Study ». Open Access Macedonian Journal of Medical Sciences 9, no D (9 octobre 2021) : 248–56. http://dx.doi.org/10.3889/oamjms.2021.6503.

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AIM: To evaluate the effect of using combined calcium hydroxide/silver nanoparticles or silver nanoparticles (AgNPs) or calcium hydroxide (Ca(OH)2) individually as intracanal medications in reducing postoperative pain and intracanal bacterial count. MATERIALS AND METHODS: Thirty patients with necrotic mandibular anterior teeth were randomly divided into 3 groups; Ca(OH)2 + AgNPs or AgNPs gel (Intervention Groups) or Ca(OH)2 (Control Group). Patients received a standard 2-visit endodontic treatment and recorded their pain levels after 4, 24, 48, 72 and 96 hours following the first and second visit on a modified visual analogue scale (VAS). Intracanal bacterial counts were assessed using culturing before and after instrumentation and intracanal medication. Outcome data were statistically analyzed using Kruskal-Wallis and Fisher’s Exact tests to compare between the groups and Friedman’s test to assess the changes by time. RESULTS: At 24 hours interappointment the incidence of pain was statistically significant (P = .005) as well as at 48 hours (P = .001). There was a statistically significant difference between the mean percentage reduction of anaerobic bacterial counts in the three groups with the highest percentage in the Ca(OH)2 + AgNPs group at 98.9% followed by AgNPs group 98.5% and Ca(OH)2 at 85.3% (P <0.001). CONCLUSIONS: Combined calcium hydroxide/silver nanoparticles reduced the intracanal bacterial counts significantly, but adversely affected the interappointment pain. Based on that finding, this combination should be tested in different concentrations with different ratios to reach the most effective combination that reduce pain with high antibacterial efficacy.
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Chen, Peiyuan, Yonghui Wang, Shicheng He, Pengju Wang, Ying Xu et Liheng Zhang. « Green Synthesis of Spherical Calcium Hydroxide Nanoparticles in the Presence of Tannic Acid ». Advances in Materials Science and Engineering 2020 (10 octobre 2020) : 1–6. http://dx.doi.org/10.1155/2020/9501897.

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This study proposes a green, low-cost, and robust method to synthesize spherical calcium hydroxide (CH) nanoparticles based on the co-precipitation of Ca2+ and OH− in the presence of tannic acid (TA), an inexpensive plant-derived polyphenol. It has been found that the morphology and crystalline phase of the produced CH nanoparticles can be controlled by TA. With the increasing dosage of TA, the crystallinity of the CH particles reduces, changing from well crystallization to amorphous phases. Experimental evidence suggests that complexion reaction took place between TA and Ca2+, which gave the Ca2+ a strong bond effect. As a result, the nucleation and growth of CH were significantly affected. CH nanoparticles with sizes of about 50 nm have been successfully synthesized by using 0.3% or more TA.
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Wu, Yanheng, Wenyi Gu, Li Li, Chen Chen et Zhi Xu. « Enhancing PD-1 Gene Silence in T Lymphocytes by Comparing the Delivery Performance of Two Inorganic Nanoparticle Platforms ». Nanomaterials 9, no 2 (28 janvier 2019) : 159. http://dx.doi.org/10.3390/nano9020159.

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Suitable carriers are crucial to RNAi applications for cancer genotherapy and T-cell immunotherapy. In this research, we selected two extensively-investigated biocompatible inorganic nanoparticle carriers, i.e., layered double hydroxide (LDH) and lipid-coated calcium phosphate (LCP) and then compared their efficacy for siRNA delivery in T cells, in order to understand which carrier is more efficient in delivering functional programmed cell death protein 1 siRNA (PD-1 siRNA) to suspended T lymphocytes. Both LDH and LCP nanoparticles quickly delivered gene segment to mouse T cell lines (EL4), while the LCP nanoparticles exhibited more cellular uptake and higher PD-1 gene silence efficiency. We further demonstrated that LCP nanoparticles successfully reduced the expression of PD-1 in human ex vivo tumor infiltrating lymphocytes (TILs). Thus, LCP nanoparticles can be used as a better nano-carrier for gene therapy in lymphocytes, especially in regards to TIL-related cancer immunotherapy.
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Khan, Shanza Rauf, Saba Jamil, Hummayun Rashid, Shahid Ali, Safyan A. Khan et Muhammad Ramzan Saeed Ashraf Janjua. « Agar and egg shell derived calcium carbonate and calcium hydroxide nanoparticles : Synthesis, characterization and applications ». Chemical Physics Letters 732 (octobre 2019) : 136662. http://dx.doi.org/10.1016/j.cplett.2019.136662.

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Drdácký, Miloš, Zuzana Slížková et Gerald Ziegenbalg. « Α Nano Approach to Consolidation of Degraded Historic Lime Mortars ». Journal of Nano Research 8 (septembre 2009) : 13–22. http://dx.doi.org/10.4028/www.scientific.net/jnanor.8.13.

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This paper presents a comparative study of the effects of calcium hydroxide based agents on consolidating a lean lime mortar. In the first part, it describes the properties and characteristics of CaLoSiL® – a new stone strengthener based on colloidal suspensions of lime nanoparticles in various solvents. It further summarizes the results of recent tests on the influence of applying nano-agents based on colloidal calcium hydroxide dispersed in ethanol or isopropyl alcohol (CaLoSiL®), and compares them with the effects of lime water and with a traditional barium hydroxide treatment. The tests were carried out on non-standard test specimens fabricated from a lean mortar (1:9) and developed specially for the purpose of testing the relatively low strengthening effects that are typical for lime water consolidation. The comparison presented in this paper is based on the mechanical characteristics of consolidated lime mortar.
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Vu, Minh X., Ha T. T. Le, Lan T. Pham, Nam H. Pham, Huong T. M. Le, Lu T. Le et Dung T. Nguyen. « SYNTHESIS OF MAGNETIC NANOPARTICLES FROM SPENT PICKING LIQUORS IN AQUEOUS SATURATED SOLUTION OF CALCIUM HYDROXIDE ». IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, no 9-10 (22 octobre 2018) : 59–63. http://dx.doi.org/10.6060/ivkkt20186109-10.5861a.

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Spent pickling liquor is a considered hazardous waste because of its very high level of acidity and high metal concentration, and the conventional neutralization method regenerates an excessive quantity of sludge that poses a serious problem concerning to the landfill disposal and risk of ground water contamination. Therefore, recovery of spent pickling liquor is necessary. Several approaches have been investigated for spent pickling liquor recovery, but they are generally costly and lead to produce various iron salts or oxides which have a limited value. In the present study, we explore the potential of using spent pickling liquor as iron precursor for the synthesis of magnetic nanoparticles. Here, Fe3O4 nanoparticles were prepared easily by oxidation-precipitation from spent hydrochloride acid pickling liquors in aqueous saturated solution of calcium hydroxide at room temperature, in the air, and under suitable speed of rotation. The FT-IR, XRD and TEM results shown that monodisperse Fe3O4 nanoparticles in the size range of 10-25 nm were obtained, with a high level of crystallinity. The BET surface area was about 46 m2 g-1. The synthesized Fe3O4 nanoparticles exhibited the superparamagnetic behavior with relatively high saturation magnetization, Ms = 73 emu/g. The synthesis procedure of magnetic nanoparticles revealed here will provide a new possibility for spent pickling liquors recovery more effectively. For citation: Vu Minh X., Le Ha T. T., Pham Lan T., Pham Nam H., Le Huong T. M., Le Lu T. Nguyen Dung T. Synthesis of magnetic nanoparticles from spent picking liquors in aqueous saturated solution of calcium hydroxide. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 9-10. P. 59-63
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Sanaa G. Al Attas, Faten Al-Hazmi, Reem Alwafi, Ahlam A. Alahmadi, Diana A. H. Al-Quwaie, Ahmed Bahieldin et Sherif Edris. « Bactericidal Efficacy of New Types of Magnesium Hydroxide and Calcium Carbonate Nanoparticles ». Molecular Genetics, Microbiology and Virology 34, no 4 (octobre 2019) : 252–62. http://dx.doi.org/10.3103/s0891416819040086.

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D. Nandhini et al.,, D. Nandhini et al ,. « Synthesis, Characterization and Computation of Potassium Doped Calcium Hydroxide nanoparticles and nanotubes ». International Journal of Mechanical and Production Engineering Research and Development 9, no 1 (2019) : 441–48. http://dx.doi.org/10.24247/ijmperdfeb201943.

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Cerda-Cristerna, B. I., et S. D. Cabo-Araoz. « PEG effects on Ca 2+ release from PLGA-calcium hydroxide-loaded nanoparticles ». Dental Materials 33 (2017) : e18. http://dx.doi.org/10.1016/j.dental.2017.08.035.

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Nuryantini, Ade Yeti, Citra Deliana Dewi Sundari, Halimahtussa’diah Halimahtussa’diah et Bebeh Wahid Nuryadin. « Synthesis and Characterization of Calcium Oxide Nanoparticles from Duck Eggshells using Ball Milling Methods ». Jurnal Kimia Valensi 5, no 2 (30 novembre 2019) : 231–135. http://dx.doi.org/10.15408/jkv.v5i2.8779.

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Calcium oxide (CaO) nanoparticles have been successfully synthesized from duck eggshells using ball milling method followed by simple calcination at 700°C for 7 hours. The observation on the morphology, size and shape of the particles of the eggshells powder was conducted through scanning electron microscope (SEM). The milling time was varied, i.e. 2, 6, 10, and 20 hours to observe the difference on the size of the produced particle. SEM images shows that the smallest average particle diameter was 520 nm, achieved by 20 hours of milling. When the particles were calcined, the average diameter was further reduced to 394 nm. The X-ray diffraction (XRD) analysis shows that the resulting particles contain calcium oxide, calcium hydroxide, and calcium carbonate.
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Walsh, Dominic, Noelia M. Sanchez-Ballester, Katsuhiko Ariga, Akihiro Tanaka et Mark Weller. « Chelate stabilized metal oxides for visible light photocatalyzed water oxidations ». Green Chemistry 17, no 2 (2015) : 982–90. http://dx.doi.org/10.1039/c4gc01604a.

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Lactate-stabilized calcium manganese oxide and cobalt hydroxide nanoparticles were utilized as catalysts in visible light photocatalyzed water oxidations. Chelated bi-metallic catalysts captured decomposed cobalt based electron acceptor and gave prolonged two stage reactions. Hydroxylated Co–lactates gave high TOF and O2 yields. Chelation produced extended reactions, higher yields and reduced waste.
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Gu, Yue, Qian Ping Ran, Xin Shu, Cheng Yu, Hong Lei Chang et Kai Lv. « Synthesis of SiO2-PCE Core-Shell Nanoparticles and its Modification Effects on Cement Hydration ». Key Engineering Materials 711 (septembre 2016) : 249–55. http://dx.doi.org/10.4028/www.scientific.net/kem.711.249.

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NanoSiO2 was widely used to modify the property of cementitious materials, however, for nanoparticles used in cement-based materials, key problem is the effective dispersion. The surface modification technology can be introduced to promote dispersion of nanoparticles in aqueous system, especially in cement pore solution, which possess high concentration of ions. In this study, at first, NanoSiO2-polycarboxylate superplasticizer (SiO2-PCE) core-shell nanoparticle was synthesized from silanized polycarboxylate superplasticizer and colloidal nanoSiO2 by the “grafting to” method, then SiO2-PCE was testified by UV-Vis, FTIR, and TGA. Additionally, stability of SiO2-PCE and its effect on cement hydration were investigated. Results shows: SiO2-PCE possess higher stability in saturated calcium hydroxide solution compared to nanoSiO2, and heat development of cement hydration can be regulated by shell structure of SiO2-PCE. The research implied a new approach for nanoSiO2 to optimize cement-based composites.
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Taglieri, Giuliana, Claudia Mondelli, Valeria Daniele, Emanuela Pusceddu et Giancarlo Scoccia. « Synthesis, Textural and Structural Properties of Calcium Hydroxide Nanoparticles in Hydro-Alcoholic Suspension ». Advances in Materials Physics and Chemistry 04, no 03 (2014) : 50–59. http://dx.doi.org/10.4236/ampc.2014.43008.

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Harish, Pushpendra Kumar, Bhavey Malhotra, Priyanka Phalswal, Pawan K. Khanna, Amena Salim, Rahul Singhal et Anoop Kumar Mukhopadhyay. « Effect of reaction rate on the properties of chemically synthesized calcium hydroxide nanoparticles ». Materials Today : Proceedings 28 (2020) : 2305–10. http://dx.doi.org/10.1016/j.matpr.2020.04.581.

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Liu, Tong, Yarong Zhu, Xuanzhou Zhang, Tongwen Zhang, Tao Zhang et Xingguo Li. « Synthesis and characterization of calcium hydroxide nanoparticles by hydrogen plasma-metal reaction method ». Materials Letters 64, no 23 (décembre 2010) : 2575–77. http://dx.doi.org/10.1016/j.matlet.2010.08.050.

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Camerini, R., G. Poggi, D. Chelazzi, F. Ridi, R. Giorgi et P. Baglioni. « The carbonation kinetics of calcium hydroxide nanoparticles : A Boundary Nucleation and Growth description ». Journal of Colloid and Interface Science 547 (juillet 2019) : 370–81. http://dx.doi.org/10.1016/j.jcis.2019.03.089.

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Giorgi, Rodorico, David Chelazzi et Piero Baglioni. « Nanoparticles of Calcium Hydroxide for Wood Conservation. The Deacidification of the Vasa Warship ». Langmuir 21, no 23 (novembre 2005) : 10743–48. http://dx.doi.org/10.1021/la0506731.

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Taglieri, G., C. Mondelli, V. Daniele, E. Pusceddu et A. Trapananti. « Synthesis and X-Ray Diffraction Analyses of Calcium Hydroxide Nanoparticles in Aqueous Suspension ». Advances in Materials Physics and Chemistry 03, no 01 (2013) : 108–12. http://dx.doi.org/10.4236/ampc.2013.31a013.

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Poggi, Giovanna, Nicola Toccafondi, David Chelazzi, Patrizia Canton, Rodorico Giorgi et Piero Baglioni. « Calcium hydroxide nanoparticles from solvothermal reaction for the deacidification of degraded waterlogged wood ». Journal of Colloid and Interface Science 473 (juillet 2016) : 1–8. http://dx.doi.org/10.1016/j.jcis.2016.03.038.

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Sequeira, Sílvia Oliveira, César António Tonicha Laia, Alan John Lander Phillips, Eurico José Cabrita et Maria Filomena Macedo. « Clotrimazole and calcium hydroxide nanoparticles : A low toxicity antifungal alternative for paper conservation ». Journal of Cultural Heritage 24 (mars 2017) : 45–52. http://dx.doi.org/10.1016/j.culher.2016.12.004.

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Румянцев, В. А., А. Р. Бессуднова, А. В. Блинова et Н. В. Заблоцкая. « ЭФФЕКТИВНОСТЬ ИМПРЕГНАЦИИ ДЕНТИНА ЗУБОВ НАНОЧАСТИЦАМИ ГИДРОКСИДА МЕДИ-КАЛЬЦИЯ ПРИ ЭКСПЕРИМЕНТАЛЬНОМ ЛЕЧЕНИИ КАРИЕСА ». MEDICINE, SCIENCE AND EDUCATION, no 34 (novembre 2022) : 51–55. http://dx.doi.org/10.56936/18291775-2022.34-51.

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For the prevention of recurrent and secondary caries of teeth, as well as bullets, antiseptic treatment of the carious cavity, dentine adhesives, laser radiation, etc. are used. However, these methods do not allow achieving effective decontamination and obturation of dentine tubules, in which pathogenic microflora can continue to persist. In the experimental treatment of dentin caries using electron microscopy, the effectiveness of a new technique of galvanophoretic nanoimpregnation of dentin with nanoparticles of a complex preparation of copper-calcium hydroxide was studied. Galvanophoresies was performed using an aluminum foil in contact with a copper-containing preparation. After instrumental treatment of the cavity, it is advisable to carry out nanoimpregnation of dentin for 14 days. During this period, 85-90% of the dentine tubules are obturated to an average depth of 800 microns and the dentine is saturated with calcium, which contributes to the restoration of its mineral composition, disturbed as a result of microbial demineralization. The effectiveness of nanoimpregnation of dentin with copper-calcium hydroxide decreases with age of the teeth, as well as with existing carious cavity.
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Rojas, Beatriz, Nicole Soto, Marcela Villalba, Helia Bello-Toledo, Manuel Meléndrez-Castro et Gabriela Sánchez-Sanhueza. « Antibacterial Activity of Copper Nanoparticles (CuNPs) against a Resistant Calcium Hydroxide Multispecies Endodontic Biofilm ». Nanomaterials 11, no 9 (31 août 2021) : 2254. http://dx.doi.org/10.3390/nano11092254.

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Endodontic treatment reduces the amount of bacteria by using antimicrobial agents to favor healing. However, disinfecting all of the canal system is difficult due to its anatomical complexity and may result in endodontic failure. Copper nanoparticles have antimicrobial activity against diverse microorganisms, especially to resistant strains, and offer a potential alternative for disinfection during endodontic therapy. This study evaluated the antibacterial action of copper nanoparticles (CuNPs) on an ex vivo multispecies biofilm using plaque count compared to the antibacterial activity of calcium hydroxide Ca(OH)2. There were significant differences between the Ca(OH)2 and CuNPs groups as an intracanal dressing compared with the CuNPs groups as an irrigation solution (p < 0.0001). An increase in the count of the group exposed to 7 days of Ca(OH)2 was observed compared to the group exposed to Ca(OH)2 for 1 day. These findings differ from what was observed with CuNPs in the same period of time. Antibacterial activity of CuNPs was observed on a multispecies biofilm, detecting an immediate action and over-time effect, gradually reaching their highest efficacy on day 7 after application. The latter raises the possibility of the emergence of Ca(OH)2-resistant strains and supports the use of CuNPs as alternative intracanal medication.
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Drajewicz, Marcin, Maciej Pytel, Paweł Rokicki et Marek Góral. « The Properties of Refined Glasses with Aluminum Hydroxide Nano-Molecules ». Solid State Phenomena 227 (janvier 2015) : 47–50. http://dx.doi.org/10.4028/www.scientific.net/ssp.227.47.

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New refining technology of soda – calcium – silicon glass surfaces with inorganic compounds nanomolecules has been presented in the study. In order to determine modification of the glass surface SEM observation and EDX analysis have been carried out. The glass samples were subjected to the UV-VIS, photo-elasticity and ellipsometry examinations. From obtained results follows, that refining of the glass surface by nanopowder aluminum hydroxide compounds provides forming of very thin surface layers. This type of modification improves physical glass properties. As the example results of microhardness refined glass are presented in the article.Keywords: glass, surface, nanoparticles, refining
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López-Arce, P., L. S. Gómez-Villalba, S. Martínez-Ramírez, M. Álvarez de Buergo et R. Fort. « Influence of relative humidity on the carbonation of calcium hydroxide nanoparticles and the formation of calcium carbonate polymorphs ». Powder Technology 205, no 1-3 (janvier 2011) : 263–69. http://dx.doi.org/10.1016/j.powtec.2010.09.026.

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