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Artículos de revistas sobre el tema "Metal-containing nanoparticles"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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1

Wang, Ji Fen, Hua Qing Xie, Zhong Xin, Yang Li y Jing Li. "Thermal Properties of Composites Containing Metal Oxide Nanoparticles". Materials Science Forum 694 (julio de 2011): 146–49. http://dx.doi.org/10.4028/www.scientific.net/msf.694.146.

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We prepared a series of paraffin wax (PW) based phase change composite containing ZnO, Al2O3 and Fe2O3 nanoparticles, respectively. DSC results showed that there is a decrease trend in phase change latent heat capacity (Ls) with an increase of metal oxide nanoparticle loadings. ZnO/PW has higher Ls than those of Fe2O3/PW and Al2O3/PW with same metal oxide nanoparticle loadings. Transient short-hot-wire (SHW) method was used to measure thermal conductivity of these composites. The results showed that nanoparticle addition leads to substantial enhancement in the thermal conductivity of the composites. The highest thermal conductivity of the measured composites is about 0.27 W/(m•K) of Fe2O3/PW with 3.0 wt% nanoparticles and Al2O3/PW with 5.0 wt% nanoparticles at 15 oC, which higher than that of PW by about 30%. The lowest thermal conductivity of composites is that of Al2O3/PW and ZnO/PW with 1.0 wt% nanoparticles at 60 oC, which higher than that of PW by about 7%.

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2

Kapustina, E. A., E. A. Titov y М. А. Novikov. "GENOTOXICITY OF METAL-CONTAINING NANOPARTICLES". Aerospace and Environmental Medicine 56, n.º 1 (2022): 26–31. http://dx.doi.org/10.21687/0233-528x-2022-56-1-26-31.

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No more than 100 nm large, nanoparticles (NPs) are distinguished by unusual mechanical, electrical, optical, thermal and magnetic properties. They are used in biology, pharmacology, medicine, chemistry, physics, materials technology and engineering industry. Nanoparticles penetrate in organism through the skin, GIT and airways. Their genotoxicity depends on size, form, mode of action and composition. Two principal mechanisms of NPs genotoxicity are primary and secondary. The primary mechanism is realized in direct interaction with the genome; the secondary mechanism is achieved through mediation of the active forms of oxygen. NPs can modulate the epigenome by altering the gene functions and do not change the DNA sequence directly. Consequences of prolonged exposure to low NPs doses on the human organism still remain uninvestigated.

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3

Zheng, Bin, Mutsunori Uenuma, Yukiharu Uraoka y Ichiro Yamashita. "Bioconjugates Containing Ferritin and Metal Nanoparticles". Advanced Materials Research 463-464 (febrero de 2012): 833–36. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.833.

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Novel assemblies of gold nanoparticles or gold nanoparticles with other inorganic nanoparticles have received considerable interest due to their fascinating properties desired for various detection applications. Here we present a bioconjugate containing ferritin and gold nanoparticles. In this bioconjugate, there is a central ferritin, and a several gold nanoparticles are located around by DNA base-pairing.

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4

Kurbanova, N. I., Z. N. Huseynova, N. Y. Ishenko, A. T. Aliyev, T. M. Guliyeva, S. K. Ragimova y S. A. Rzaeva. "METAL-CONTAINING NANOPARTICLES IN A MALEINIZED POLYETHYLENE MATRIX AS NANOFILLERS FOR POLYPROPYLENE". Azerbaijan Chemical Journal, n.º 1 (19 de marzo de 2019): 54–58. http://dx.doi.org/10.32737/0005-2531-2019-1-54-58.

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5

Liu, Fangfei y Xiong Liu. "Amphiphilic Dendronized Copolymer-Encapsulated Au, Ag and Pd Nanoparticles for Catalysis in the 4-Nitrophenol Reduction and Suzuki–Miyaura Reactions". Polymers 16, n.º 8 (12 de abril de 2024): 1080. http://dx.doi.org/10.3390/polym16081080.

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The branched structures of dendronized polymers can provide good steric stabilization for metal nanoparticle catalysts. In this work, an amphiphilic dendronized copolymer containing hydrophilic branched triethylene glycol moieties and hydrophobic branched ferrocenyl moieties is designed and prepared by one-pot ring-opening metathesis polymerization, and is used as the stabilizer for metal (Au, Ag and Pd) nanoparticles. These metal nanoparticles (Au nanoparticles: 3.5 ± 3.0 nm; Ag nanoparticles: 7.2 ± 4.0 nm; Pd nanoparticles: 2.5 ± 1.0 nm) are found to be highly active in both the 4-nitrophenol reduction and Suzuki–Miyaura reactions. In the 4-nitrophenol reduction, Pd nanoparticles have the highest catalytic ability (TOF: 2060 h−1). In addition, Pd nanoparticles are also an efficient catalyst for Suzuki–Miyaura reactions (TOF: 1980 h−1) and possess good applicability for diverse substrates. The amphiphilic dendronized copolymer will open a new door for the development of efficient metal nanoparticle catalysts.

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6

Paulraj, Prabhavathi, Sankareswaran Muruganantham, Anbalagan S, Manikandan A y Karthikeyan G. "GREEN SYNTHESIS AND CHARACTERIZATION OF SILVER NANOPARTICLES FROM WITHANIA SOMNIFERA (L.) DUNAL". Asian Journal of Pharmaceutical and Clinical Research 9, n.º 5 (1 de septiembre de 2016): 34. http://dx.doi.org/10.22159/ajpcr.2016.v9i5.13204.

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ABSTRACTThe metal nanoparticle synthesis is highly explored the field of nanotechnology. The biological methods seem to be more effective because of slowreduction rate and polydispersity of the final products. The main aim of this study is too the rapid and simplistic synthesis of silver nanoparticlesby Withania somnifera Linn. at room temperature. The exposure of reaction mixtures containing silver nitrate and dried leaf powder of W. somniferaresulted in reduction of metal ions within 5 minutes. The extracellular synthesized silver nanoparticles were characterized by ultraviolet-visible,infrared (IR) spectroscopy, X-ray diffraction studies, zeta potential, Fourier transform IR, and scanning electron microscopy. The antibacterial andantifungal studies showed significant activity as compared to their respective standards. From the results, W. somnifera sliver nanoparticle has attainedthe maximum antimicrobial against clinical pathogens and also seen very good stability of nanoparticle throughput processing. As we concluded, thistype of naturally synthesized sliver nanoparticle could be a better green revolution in medicinal chemistry.Keywords: Antimicrobial activity, Silver nanoparticles, Withania somnifera.

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7

Batsmanova, Ludmila, Nataliya Taran, Yevheniia Konotop, Svitlana Kalenska y Nataliya Novytska. "Use of a colloidal solution of metal and metal oxide-containing nanoparticles as fertilizer for increasing soybean productivity". Journal of Central European Agriculture 21, n.º 2 (2020): 311–19. http://dx.doi.org/10.5513/jcea01/21.2.2414.

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8

Gouda, M., AA Hebeish y AI Aljaafari. "New route for development of electromagnetic shielding based on cellulosic nanofibers". Journal of Industrial Textiles 46, n.º 8 (21 de enero de 2016): 1598–615. http://dx.doi.org/10.1177/1528083715627166.

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A radically new innovation was established for development of electromagnetic interference shielding. The innovation emphasis synthesis of carboxymethyl cellulose (CMC), carboxymethyl cellulose composite containing different metal nanoparticles (CMC-MNPs), and carboxymethyl cellulose nanofiber mat (CMC-NF) and carboxymethyl cellulose containing metal nanofiber mat (CMC-MNPs nanofiber mat) by electrospinning technique. Metal nanoparticles used include copper nanoparticles, iron nanoparticles, zinc nanoparticles, cadmium nanoparticles, and cobalt nanoparticles. Synthesized CMC–MNPs were characterized by using scanning electron microscopy coupled with high-energy dispersive X-ray and UV–visible spectroscopy that was used for confirmation of nanoparticles formation. The scanning electron microscopy images clearly showed regular flat shape with semiporous surface. All metal nanoparticles were well distributed inside the backbone of the cellulose without aggregation. The average particle diameter was 29–39 nm for zinc nanoparticles, 29–33 nm for cadmium nanoparticles, 25–33 nm for cobalt nanoparticles, 23–27 nm for copper nanoparticles, and 22–26 nm for iron nanoparticles. Electrospun carboxymethyl cellulose and CMC–MNPs nanofiber mats were synthesized by electrospinning technique and characterized using scanning electron microscopy, energy dispersive X-ray, and transmission electron microscopy. Scanning electron microscopy images of electrospun carboxymethyl cellulose and CMC–MNPs nanofibers reveal smooth and uniformly distributed nanofibers without bead formation with average fiber diameters in the range of 300–450 nm. Moreover, the diameters of electrospun carboxymethyl cellulose nanofiber mat were not affected by the presence of metal nanoparticles. Metal nanoparticles’ content inside the electrospun CMC–MNPs nanofibers was investigated by using atomic absorption spectroscopy. Electromagnetic interference shielding of electrospun carboxymethyl cellulose and CMC–MNPs nanofiber mats was evaluated. Data showed that the EMI-SE was increased in presence of metal nanoparticles and depending on both the metal nanoparticle contents and the electrical conductivity of metal nanoparticles.

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9

Валуева, С. В., Л. Н. Боровикова, М. Э. Вылегжанина, О. В. Назарова y Е. Ф. Панарин. "Стабилизированные (био)полимерами наночастица металлов и металлоида: спектральные и структурно-морфологические характеристики". Журнал технической физики 92, n.º 7 (2022): 924. http://dx.doi.org/10.21883/jtf.2022.07.52645.315-21.

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A comparative study of the spectral and structural-morphological characteristics of the metal (copper, silver) and metalloid (selenium) containing nanodispercions based on biocompatible water-soluble stabilizers: bovine serum albumin, random copolymers of 2-deoxy-2-methacrylamide-D-glucose or 4-acryloyl-morpholine with 2-dimethylaminoethyl-methacrylate was carried out by means of the UV-spectroscopy, atomic-force and transmission electronic microscopy. Effect of the nature of the nanoparticle as well as polymeric stabilizer on the spectral and structural-morphological characteristics and mechanism of formation of the nanostructures/nanoparticles was shown. It has been established that structures with different organization of the organic phase around nanoparticles are formed in the studied nanodispersions. It has been shown that for the studied polymer carriers, metal-containing nanostructures/nanoparticles have smaller dimensions than metalloid-containing systems.

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10

Kalenskii, A. V., A. A. Zvekov, E. V. Galkina y D. R. Nurmuhametov. "Modeling spectral properties of transparent matrix composites containing core-shell nanoparticles". Computer Optics 42, n.º 2 (24 de julio de 2018): 254–62. http://dx.doi.org/10.18287/2412-6179-2018-42-2-254-262.

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Optical properties of transparent matrix composites containing metal nanoparticles coated with an oxide shell were numerically simulated based on the Aden-Kerker theory applicable for concentric spheres. Using pentaerythritol tetranitrate composites (containing Al/Al2O3 nanoparticles) as an example, the linear scattering and absorption coefficients as well as the total reflectance and transmittance and collimated beam transmittance were shown to be determined by the sample thickness, the nanoparticle radius, the mass fraction of nanoparticles, and mass fraction of the oxide in the nanoparticles. An approach to determining the said parameters based on the comparison of the calculated spectral dependencies of the reflectance and transmittance with the experimental ones was suggested. The nanoparticle radius was determined with the minimum error (of about 2 – 3 %), while the nanoparticle mass fraction and oxide mass fraction were weak parameters determined with a 25 % error.

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11

Kim, Ki-Hwan, Emmanuel Lefeveure, Marc Châtelet y Costel-Sorin Cojocaru. "Porous Alumina Template based Versatile and Controllable Direct Synthesis of Silicon nanowires". MRS Proceedings 1439 (2012): 11–16. http://dx.doi.org/10.1557/opl.2012.940.

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ABSTRACTHighly densely packed, self-organized silicon nanowires with very narrow diameter distribution were synthesized within porous anodic alumina templates with electrodeposited catalytic metal nanoparticles. For successful catalytic metal nanoparticle deposition, electrochemical-, and chemical barrier layer thinning process was investigated following anodization process. Controlled pulsed electrodeposition process was carried out for a volume calibration of desired catalytic metal nanoparticle deposition inside nanopore arrays using different metal-ion containing electrolyte. Not only single metal nanoparticles, but also multi metal nanoparticles layers were filled inside PAA to enhance metal filling aspect, and to control the volume of nanoparticles more precisely. Using multilayered metal nanoparticles resulted on different SiNW’s growth behavior depending on the types of underlying metal nanoparticles.SiNWs were successfully synthesized using hot-filament assisted chemical vapor deposition system. Although silicon precursor gas can generally be dissociated at relatively low temperatures, the use of a hot filament activation help decreasing process temperature, and also, highly activated atomic hydrogen generation via the tungsten hot filament placed at gas inlet helps preventing parasitic amorphous silicon deposition on either the alumina membrane surface or the pore wall which hinders appropriate growth of SiNWs in PAA by nanopores clogging. Such densely packed, self-organized SiNWs are of high interest in many application fields like nanoelectronics, optoelectronics, and energy storage/conversion devices etc.

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12

Karlsson, Hanna L. y Andrea Hartwig. "Lung Cell Toxicity of Metal-Containing Nanoparticles". Nanomaterials 12, n.º 17 (2 de septiembre de 2022): 3044. http://dx.doi.org/10.3390/nano12173044.

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13

YONEZAWA, Tetsu. "Overlook of Gold Nanoparticles and Other Metal Nanoparticles Containing Gold". Oleoscience 14, n.º 1 (2014): 11–15. http://dx.doi.org/10.5650/oleoscience.14.11.

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14

Staroń, Anita, Olga Długosz, Jolanta Pulit-Prociak y Marcin Banach. "Analysis of the Exposure of Organisms to the Action of Nanomaterials". Materials 13, n.º 2 (12 de enero de 2020): 349. http://dx.doi.org/10.3390/ma13020349.

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The rapid development of the production of materials containing metal nanoparticles and metal oxides is a potential risk to the environment. The degree of exposure of organisms to nanoparticles increases from year to year, and its effects are not fully known. This is due to the fact that the range of nanoparticle interactions on cells, tissues and the environment requires careful analysis. It is necessary to develop methods for testing the properties of nanomaterials and the mechanisms of their impact on individual cells as well as on entire organisms. The particular need to raise public awareness of the main sources of exposure to nanoparticles should also be highlighted. This paper presents the main sources and possible routes of exposure to metal nanoparticles and metal oxides. Key elements of research on the impact of nanoparticles on organisms, that is, in vitro tests, in vivo tests and methods of detection of nanoparticles in organisms, are presented.

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15

Barrera, Gabriele, Paola Tiberto, Paolo Allia, Barbara Bonelli, Serena Esposito, Antonello Marocco, Michele Pansini y Yves Leterrier. "Magnetic Properties of Nanocomposites". Applied Sciences 9, n.º 2 (9 de enero de 2019): 212. http://dx.doi.org/10.3390/app9020212.

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The magnetic properties of various families of nanocomposite materials containing nanoparticles of transition metals or transition-metal compounds are reviewed here. The investigated magnetic nanocomposites include materials produced either by dissolving a ferrofluid containing pre-formed nanoparticles of desired composition and size in a fluid resin submitted to subsequent curing treatment, or by generating the nanoparticles during the very synthesis of the embedding matrix. Two typical examples of these production methods are polymer nanocomposites and ceramic nanocomposites. The resulting magnetic properties turn out to be markedly different in these two classes of nanomaterials. The control of nanoparticle size, distribution, and aggregation degree is easier in polymer nanocomposites, where the interparticle interactions can either be minimized or exploited to create magnetic mesostructures characterized by anisotropic magnetic properties; the ensuing applications of polymer nanocomposites as sensors and in devices for Information and Communication Technologies (ICT) are highlighted. On the other hand, ceramic nanocomposites obtained from transition-metal loaded zeolite precursors exhibit a remarkably complex magnetic behavior originating from the simultaneous presence of zerovalent transition-metal nanoparticles and transition-metal ions dissolved in the matrix; the applications of these nanocomposites in biomedicine and for pollutant remediation are briefly discussed.

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16

Zhu, Jing, Yang Liu, Juan He, Hong Liang Wei y Hui Juan Chu. "Carbon Nanotubes Containing Metal Nanoparticles-Graft-Hyperbranched Polyglycerols Nanocomposites". Advanced Materials Research 284-286 (julio de 2011): 360–64. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.360.

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New water soluble multiwall carbon nanotubes (MWCNTs) containing silver nanoparticles-grafted-hyperbranched polyglycerols (HPG) nanocomposites were synthesized and characterized successfully. In this work, MWCNTs were opened using HNO3/H2SO4mixture and filled by metal nanoparticles such as silver nanoparticles through wet chemcial method. Then MWCNTs containing silver nanoparticles (MWCNTs(Ag)) were used as macroinitiator for ring opening polymerization of glycidol and MWCNTs(Ag)-g-HPG nanocomposites were obtained. Structure of nanocomposites was evaluated by TEM, TGA and spectroscopy methods. With the solubility of MWCNTs(Ag)-g-HPG greatly improved, the new nanocomposites exhibit potential application in biomedicine and nanomedicine.

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17

Pandey, P. C., Atul Kumar Tiwari, Munesh Kumar Gupta, Govind Pandey y Roger J. Narayan. "Effect of the Organic Functionality on the Synthesis and Antimicrobial Activity of Silver Nanoparticles". Nano LIFE 10, n.º 03 (16 de julio de 2020): 2050002. http://dx.doi.org/10.1142/s1793984420500026.

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In this paper, the effects of the organic reducing agent and 3-aminopropyltrimethoxysilane on the synthesis and properties of mono-, bi-, and trimetallic noble metal nanoparticles were considered; the antimicrobial activity of these nanomaterials was also evaluated. It was shown that 3-aminoptopyltrimethoxysilane-treated noble metal cations undergo rapid conversion into nanoparticles in the presence of three organic reducing agents, namely, 3-glycidoxypropyltrimethoxysilane (3-GPTMS), cyclohexanone and formaldehyde; the nanoparticles were formed on the order of one minute under microwave incubation. Bimetallic nanoparticles were formed by simultaneous or sequential reduction of metal cations; the formation of trimetallic nanoparticles containing gold, silver and palladium was demonstrated using a similar approach. The nanoparticles were characterized using UV-Visible light spectrophotometry, transmission electron microscopy and zeta potential measurements. All three nanoparticles exhibited a size [Formula: see text]10[Formula: see text]nm size. The nanoparticles showed antimicrobial activity against Acinetobacter baumannii. Scanning electron microscopy imaging showed an alteration in the size and shape of nanoparticle-treated bacterium, with bleb formation and cell wall disruption observed within 1[Formula: see text]h of incubation at the MBC values of the nanoparticles. Fluorescence spectrophotometric imaging of silver nanoparticle-Acinetobacter baumannii interactions suggested selective binding of silver nanoparticles to surface proteins. Our results showed the preparation of the novel silver nanoparticles with potent Anti-Acinetobacter baumannii activity, which can serve as an alternative to conventional antimicrobial agents.

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18

Li, Yongjiang, Xiaoyan Ma, Jingyu Ma, Zongwu Zhang, Zhaoqi Niu y Fang Chen. "Fabrication of Pore-Selective Metal-Nanoparticle-Functionalized Honeycomb Films via the Breath Figure Accompanied by In Situ Reduction". Polymers 13, n.º 3 (20 de enero de 2021): 316. http://dx.doi.org/10.3390/polym13030316.

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Honeycomb films pore-filled with metal (Au, Ag, and Cu) nanoparticles were successfully prepared by combining the breath figure method and an in situ reduction reaction. First, a polyhedral oligomeric silsesquioxane (POSS)-based star-shaped polymer solution containing metal salt was cast under humid conditions for the formation of honeycomb films pore-filled with metal salt through the breath figure method. The morphology of the honeycomb films was mainly affected by the polymer molecular structure and the metal salt. Interestingly, the promoting effect of the metal salt in the breath figure process was also observed. Then, honeycomb films pore-filled with metal nanoparticles were obtained by in situ reduction of the honeycomb films pore-filled with metal salt using NaBH4. Notably, the metal nanoparticles can be selectively functionalized in the pores or on the surface of the honeycomb films by controlling the concentration of the NaBH4. Metal-nanoparticle-functionalized honeycomb films can prospectively be used in catalysis, flexible electrodes, surface-enhanced Raman spectroscopy (SERS), and wettability patterned surfaces.

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19

Konotop, Ye O., M. S. Kovalenko, V. Z. Ulynets, A. O. Meleshko, L. M. Batsmanova y N. Yu Taran. "Phytotoxicity of colloidal solutions of metal-containing nanoparticles". Cytology and Genetics 48, n.º 2 (marzo de 2014): 99–102. http://dx.doi.org/10.3103/s0095452714020054.

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20

IWAKOSHI, Ayako y Toshikatsu KOBAYASHI. "Coating Materials Containing Metal Nanoparticles Protected by Polymer". Kobunshi 53, n.º 10 (2004): 813–18. http://dx.doi.org/10.1295/kobunshi.53.813.

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21

Stepanov, A. L., D. E. Hole y P. D. Townsend. "Optical reflectance of insulators containing implanted metal nanoparticles". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 161-163 (marzo de 2000): 913–16. http://dx.doi.org/10.1016/s0168-583x(99)00782-x.

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22

Dzhardimalieva, G. I., A. D. Pomogailo, N. D. Golubeva, S. I. Pomogailo, O. S. Roshchupkina, G. F. Novikov, A. S. Rozenberg y M. Leonowicz. "Metal-containing nanoparticles with core-polymer shell structure". Colloid Journal 73, n.º 4 (agosto de 2011): 458–66. http://dx.doi.org/10.1134/s1061933x11040041.

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23

Finogenova, Y. A., A. A. Lipengolts, V. A. Skribitsky, K. E. Shpakova, A. V. Smirnova, A. V. Skribitskaya, N. N. Sycheva y E. Y. Grigorieva. "Metal Nanoparticles as Radiosensitizers for Cancer Radiotherapy in Vivo". Meditsinskaya Fizika, n.º 3 (2 de octubre de 2023): 70–86. http://dx.doi.org/10.52775/1810-200x-2023-99-3-70-86.

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Metal nanoparticles are capable of enhancing the destructive effect of ionizing radiation on biological tissue, which allows them to be used as radiosensitizers for improving the efficacy of cancer radiotherapy. The most promising nanoparticles are those with a high atomic number (Z>52), since they can serve both as dose-enhancing agents for contrast-enhanced radiotherapy and as contrast media for computed tomography. Due to the high metal content in each particle and the ability to selectively accumulate in tumor tissue, nanoscale agents can deliver more metal atoms to the tumor compared to low-molecular compounds. At present, only two metal nanoparticle agents (NBTXR3 and AGuIX) are undergoing clinical trials as radiosensitizers. However, a wide range of nanoparticles with different composition and structure is being extensively studied in laboratory animals. This review summarizes the results of in vivo studies where nanoparticles containing gold, bismuth or gadolinium were used in combination with external photon irradiation in order to inhibit the growth of model tumors in small laboratory animals.

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24

Pan, Hong Cheng, Wei Hong Liu, Xue Peng Li, Yan Bin Ren y Shan Hu Liu. "Metal-Modulated Growth of Au Nanoparticles by Electropolymerized 8-Hydroxyquinoline Films". Advanced Materials Research 503-504 (abril de 2012): 334–37. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.334.

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8-hydroxyquinoline (8-Hq) films were electropolymerized on indium-tin-oxide-coated (ITO) glass slides by using cyclic voltammetry. The 8-Hq electropolymerized on ITO electrode (8-Hq/ITO) was immersed in a 5-mL solution containing 0.01 M phosphate buffer solution (PBS, pH 7.0), 0.8 mM cetyltrimethylammonium chloride, 20 µL of HAuCl4 (1%, w/w), and 50 µL of Au nanoparticle seeds. The mixture was incubated at 57oC for 3 h. Then Au nanoparticles were grown and deposited onto the 8-Hq/ITO electrode. It was found that some metal ions (Zn2+, Cd2+, Mg2+, and Pb2+) could inhibit the growth of Au nanoparticles. The metal-modulated growth of Au nanoparticles was studied by UV-vis spectra and differential pulse voltammetry.

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25

Ding, Lingling, Zhidong Liu, Mike Aggrey, Chunhua Li, Jing Chen y Ling Tong. "Nanotoxicity: The Toxicity Research Progress of Metal and Metal- Containing Nanoparticles". Mini-Reviews in Medicinal Chemistry 15, n.º 7 (24 de abril de 2015): 529–42. http://dx.doi.org/10.2174/138955751507150424104334.

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26

Yamamoto, Shunya, Hiroshi Koshikawa, Tomitsugu Taguchi y Tetsuya Yamaki. "Precipitation of Pt Nanoparticles inside Ion-Track-Etched Capillaries". Quantum Beam Science 4, n.º 1 (6 de febrero de 2020): 8. http://dx.doi.org/10.3390/qubs4010008.

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Ion-track-etched capillaries containing nanoparticles of precious metals (e.g., Pt, Au, and Ag) can be applied to plasmonic absorber materials. The precipitation of homogeneous and highly dispersed precious metal nanoparticles inside capillaries represents a key process. Ion-track-etched capillaries (diameter: ~500 nm, length: ~25 μm) were created in polyimide film by 350 MeV Xe irradiation (3 × 107 ions/cm2) and chemical etching (using a sodium hypochlorite solution). The films with capillaries were immersed in an aqueous solution containing 0.1–10 mmol/L H2PtCl6 and 0.5 vol% C2H5OH, and then irradiated with a 2 MeV electron beam up to a fluence of 1.4 × 1016 e/cm2. The Pt particles inside the capillaries were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The precipitation of Pt nanoparticles and isolated aggregates inside the capillaries was confirmed by TEM. The Pt nanoparticles tended to aggregate under increasing concentrations of H2PtCl6 in the aqueous solution; meanwhile, no changes in nanoparticle size were noted under increasing electron beam fluence. The results suggest that the proposed method can be used to form metal nanoparticles in nanosized capillaries with a high aspect ratio.

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27

Kurbanova, N. I., N. A. Alimirzoeva, Z. N. Huseynova, N. Y. Ishenko, A. T. Aliyev, T. M. Guliyeva y S. K. Ragimova. "Metal-containing nanocomposites based on isotactic polypropylene". Plasticheskie massy, n.º 1-2 (19 de marzo de 2020): 23–25. http://dx.doi.org/10.35164/0554-2901-2020-1-2-23-25.

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The eﬀect of additives of metal-containing nanoﬁllers, including zinc oxide nanoparticles, on the properties of nanocomposites based upon isotactic polypropylene (PP), using X-ray phase analysis (XPA) and thermogravitometric (TGA) analysis was studied.The improvement of the strength and rheological indexes, as well as the thermooxidative stability of the nanocomposites obtained was revealed.

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28

Ragimova, S. K. "OBTAINING THE METAL-CONTAINING NANOPARTICLES IN POLYETHYLENE MATRIX BY MECHANO-CHEMICAL METHOD AND STUDY OF THEIR PROPERTIES". Azerbaijan Chemical Journal, n.º 2 (18 de junio de 2020): 20–25. http://dx.doi.org/10.32737/0005-2531-2020-2-20-25.

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29

Haryono, Agus, Sri Budi Harmami y Dewi Sondari. "Preparation of Magnetite Nanoparticles by Thermal Decomposition of Iron (III) Acetylacetonate with Oleic Acid as Capping Agent". Materials Science Forum 737 (enero de 2013): 153–58. http://dx.doi.org/10.4028/www.scientific.net/msf.737.153.

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The thermal decomposition of organometallic compounds was used to synthesize magnetite nanoparticles in high boiling point organic solvent containing stabilizing surfactants. Iron (III) acetylacetonate was used as the organometallic precursor in this work. Thermal decomposition of cationic metal center leads directly to the metal oxide, in the presence of 1,2-hexadecanediol, oleylamine, and oleic acid in diphenyl ether. Characterization with the Particle Size Analyzer (PSA) showed the size of the obtained magnetite nanoparticles was 2.1 ± 0.9 nm with polydispersity index of 0.327. The morphology and chemical structure of the obtained magnetite nanoparticle was characterized by using of Transmition Electron Microscopy (TEM) and Fourier-Transformed Infrared (FTIR) spectroscopy. The application of magnetite nanoparticles in the industrial wastewater treatment was also discussed.

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Yannopapas, Vassilios. "An atomistic-electrodynamics theory for the optical response of periodic lattices of metallic nanoparticles in the quantum size regime". International Journal of Modern Physics B 31, n.º 24 (30 de septiembre de 2017): 1740001. http://dx.doi.org/10.1142/s021797921740001x.

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We present a new theoretical method for calculating the optical properties of periodic arrays of metallic nanoparticles whose dimensions are in the quantum-size limit and cannot, therefore, be described by macroscopic electrodynamic theory based on Maxwell’s equations. In the first stage, the method calculates the scattering matrix for a single metal nanoparticle described as a polyhedral cluster of atoms, via a discrete-dipole approximation/point-matching technique. The resulting scattering matrix is incorporated into a layer-multiple-scattering technique which allows the modeling of two- and three-dimensional nanostructures containing very small metal nanoparticles. The method is demonstrated for square arrays of silver nanoparticles with radii below 2 nm and the corresponding results are compared against classical local and nonlocal electrodynamic approaches.

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Merijs Meri, Remo, Andris Shutka, Ilmars Zalite y Andrzej K. Bledzki. "Metal Oxide Mineral Filler Containing Polymer Nanocomposites". Solid State Phenomena 151 (abril de 2009): 154–58. http://dx.doi.org/10.4028/www.scientific.net/ssp.151.154.

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Metal oxide mineral filled polycarbonate (PC) nanocomposites have been investigated. Plasma-chemical synthesis has been used to obtain metal oxide nanoparticles (MON). Melt mixing has been utilized to obtain PC/MON composites with regularly organized nanostructure. Consequently, an increasing in MON content caused a small decrease of surface and volume resistivities and an increase of nanocomposites magnetic activity.

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32

Rayhan, Tara Hafiz, Chi Nam Yap, Arma Yulisa, Rubiyatno, Irina Popescu, Jose Arturo Alvarez y Risky Ayu Kristanti. "Engineered Nanoparticles for Wastewater Treatment System". Civil and Sustainable Urban Engineering 2, n.º 2 (10 de octubre de 2022): 56–66. http://dx.doi.org/10.53623/csue.v2i2.113.

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Industrial and commercial use of engineered nanoparticles is rising. Less care is given to the negative effects on the environment and wastewater treatment systems, which could release hazardous pathogens and microorganisms and threaten human health. Due to their size and features, artificial nanoparticles can easily enter wastewater systems and impair treatment. This paper aimed to focus on nanoparticle detection limitations and their effects on wastewater treatment technologies. Nanoparticles have the potential to be utilised in the treatment of waste water. By virtue of its exceptionally high surface area, it can effectively remove poisonous metal ions, microorganisms that cause disease, as well as organic and inorganic solutes from water. Various groups of nanomaterials, such as metal-containing nanoparticles, carbonaceous nanomaterials, zeolites, and dendrimers, have been demonstrated to be effective for water purification. Composites are two or more materials assembled synthetically. Nanocomposites are vital for environmental rehabilitation because pollution is one of the world's biggest concerns and polluted water management. Population growth has increased the need for clean water. This includes ceramics, metal-based polymers, carbon, and iron-based graphene. Nanocomposites such as carboxyl methyl may adsorb a heavy metal ion and pesticide at a satisfactory rate. This study found that nanocomposites are good for restoring the environment and can be used in countries with low incomes.

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Torimoto, Tsukasa, Yasuhiro Ohta, Kazuki Enokida, Daisuke Sugioka, Tatsuya Kameyama, Takahisa Yamamoto, Tamaki Shibayama, Kazuki Yoshii, Tetsuya Tsuda y Susumu Kuwabata. "Ultrathin oxide shell coating of metal nanoparticles using ionic liquid/metal sputtering". Journal of Materials Chemistry A 3, n.º 11 (2015): 6177–86. http://dx.doi.org/10.1039/c4ta06643j.

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Anikina, Ekaterina V. y Alphiya R. Tsygankova. "Cellular markers of chronic obstructive pulmonary disease from exposure to nanoparticlecontaining aerosols". Russian Journal of Occupational Health and Industrial Ecology 60, n.º 11 (3 de diciembre de 2020): 723–26. http://dx.doi.org/10.31089/1026-9428-2020-60-11-723-726.

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Introduction. The role of industrial aerosol nanoparticles in the development of chronic obstructive pulmonary disease is still poorly understood. The aim of study is to determine the distribution of monocyte subpopulations in patients with chronic obstructive pulmonary disease under the influence of industrial aerosols containing nanoparticles. Materials and methods. A single-center cohort observational study included patients with chronic obstructive pulmonary disease (COPD) (GOLD 2011 criteria) who were exposed to industrial aerosols (n=32), COPD patients, tobacco smokers (n=35), and conditionally healthy individuals without occupational hazards (n=29). Nanoparticles in the air of the working area were determined by inductively coupled plasma atomic emission spectrometry and scanning electron microscopy. Metal-containing nanoparticles (Pb, Fe, Cr) predominated in the casters' workplaces, while the grinders were mainly exposed to silicon dioxide nanoparticles. The groups were comparable by gender, age, and duration of COPD. Monocyte subpopulations in peripheral blood were determined by flow cytofluorometry. Results. In COPD patients who worked in contact with an industrial aerosol containing metal nanoparticles, the proportion of "classical" CD14+CD16- monocytes was increased, and the proportion of "intermediate" CD14+CD16+ and "non-classical" CD14dimCD16+ was reduced. The percentage of "non-classical" monocytes exposed to silicon dioxide nanoparticles was increased, and the percentage of "intermediate" monocytes was reduced. At the same time, the proportion of classical monocytes was highest in patients with COPD who worked under the influence of metal nanoparticles (84.3%±6.3%), intermediate monocytes - in patients with COPD due to tobacco smoking (6.1%±1.5%), non-classical monocytes - in the group of COPD and contact with silicon dioxide nanoparticles (20.45%±0.25%). Conclusions. COPD under the influence of industrial aerosol containing metal nanoparticles is characterized by an increase in the proportion of "classical' monocytes, and silicon dioxide nanoparticles - "non-classical”. The level of subpopulations of blood monocytes is a promising marker of professionally caused COPD.

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35

Umarov, A. V. "Study of Thermal Properties of Metal-Filled Nanocompositions Based on Polyethylene". Journal of Nature, Science & Technology 1, n.º 4 (21 de octubre de 2021): 6–10. http://dx.doi.org/10.36937/janset.2021.004.002.

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The production of metal-containing nanoparticles is one of the important problems of modern science related to the creation of nanomaterials. Nanocomposites based on polymer matrices and uniformly distributed nanoparticles (quantum dots) isolated from each other in them have unique photoluminescent properties; in addition, polymer matrices are convenient stabilizers of nanoparticle growth and have good mechanical properties. Of the nanoparticles of semiconducting materials, metal chalcogenides (CdS, Cu) are of the greatest interest. In the chemical synthesis of metal sulfides in a polymer medium, H2S or a compound containing active sulfur can act as a sulfiding agent. Samples of nanocomposites based on semiconductor sulfides and polyethylene have been synthesized. The composition, structure and structure of nanoparticles were studied by X-ray phase analysis and spectroscopy. Investigated from thermophysical properties. From studies of the temperature dependence of the heat capacity of the compositions, LDPE and CdS compositions, It can be seen that there is a peak on the curve in the temperature range of 100-2250K, which almost degenerates with an increase in the concentration of the filler. Measurements of the temperature dependence of thermal conductivity and heat capacity revealed the presence of reversible structural rearrangements in polymer composites with metal oxide fillers. Moreover, various methods, within the limits of errors, fix a constant transition temperature of electrical conductivity, thermal conductivity and heat capacity, which speaks in favor of the fact that the basis of all detected anomalies is a single mechanism, i.e. structural rearrangement of defect states of polymer composites.

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Šebesta, Martin, Hana Vojtková, Veronika Cyprichová, Avinash P. Ingle, Martin Urík y Marek Kolenčík. "Mycosynthesis of Metal-Containing Nanoparticles—Fungal Metal Resistance and Mechanisms of Synthesis". International Journal of Molecular Sciences 23, n.º 22 (15 de noviembre de 2022): 14084. http://dx.doi.org/10.3390/ijms232214084.

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In the 21st century, nanomaterials play an increasingly important role in our lives with applications in many sectors, including agriculture, biomedicine, and biosensors. Over the last two decades, extensive research has been conducted to find ways to synthesise nanoparticles (NPs) via mediation with fungi or fungal extracts. Mycosynthesis can potentially be an energy-efficient, highly adjustable, environmentally benign alternative to conventional physico-chemical procedures. This review investigates the role of metal toxicity in fungi on cell growth and biochemical levels, and how their strategies of resistance, i.e., metal chelation, biomineral formation, biosorption, bioaccumulation, compartmentalisation, and efflux of metals from cells, contribute to the synthesis of metal-containing NPs used in different applications, e.g., biomedical, antimicrobial, catalytic, biosensing, and precision agriculture. The role of different synthesis conditions, including that of fungal biomolecules serving as nucleation centres or templates for NP synthesis, reducing agents, or capping agents in the synthesis process, is also discussed. The authors believe that future studies need to focus on the mechanism of NP synthesis, as well as on the influence of such conditions as pH, temperature, biomass, the concentration of the precursors, and volume of the fungal extracts on the efficiency of the mycosynthesis of NPs.

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Sabo, Y. T., D. E. Boryo, I. Y. Chindo y A. I. Habib. "Nanocomposites Transformed from Polystyrene Waste/Antimony, Barium and Nickel Oxides Nanoparticles with Improved Mechanical Properties". Journal of Applied Sciences and Environmental Management 25, n.º 11 (10 de febrero de 2022): 1921–25. http://dx.doi.org/10.4314/jasem.v25i11.11.

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In this experiment, the oxide nanoparticles were synthesized via chemical precipitation and the nanocomposites were produced using in situ polymerization method with varying nanoparticles contents ranged from 0 to 5 g. The mechanical properties of the nanocomposites were investigated and compared with the values obtained for untreated polystyrene. It was observed that the mechanical properties were higher for the nanocomposites and increase with increasing nanoparticle concentrations in the samples. It can be observed that the untreated polystyrene gave a tensile strength of 945.25 N/mm2. At high nanoparticle content of 5 g, the nanocomposite containing NiO nanoparticles showed a tensile strength of 973.83 N/mm2 while nanocomposite containing BaO nanoparticles gave a tensile strength of 968.19 N/mm2 and nanocomposite containing Sb2O3 nanoparticle gave a tensile strength of 955.53 N/mm2. The results indicate that the tensile strength and percentage elongation of all the nanocomposites improved with the addition of metal oxides nanoparticles compared with the untreated polystyrene. Slight decrease in percentage reduction in area of the nanocomposites was recorded. Conclusively, with these results, the PS/NiO nano composite showed a better trend of behaviour due to better interfacial interaction between the nanofillers and the polymer matrix followed by PS/BaO and PS/Sb2O3 nanocomposites. It is recommended that during the production of polymer nanocomposite, PS/NiO, PS/BaO and PS/Sb2O3 nanocomposites could be used as reinforcements in the construction of buildings to add structural stability to the building.

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38

Hayashi, Yoshiaki, Shuichiro Hashi, Hiroaki Kura, Takeshi Yanai, Tomoyuki Ogawa, Kazushi Ishiyama, Masaki Nakano y Hirotoshi Fukunaga. "Electrochemical fabrication of nanocomposite films containing magnetic metal nanoparticles". Japanese Journal of Applied Physics 54, n.º 7 (11 de junio de 2015): 075201. http://dx.doi.org/10.7567/jjap.54.075201.

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39

Irzhak, V. I. "The mechanisms of the formation of metal-containing nanoparticles". Review Journal of Chemistry 6, n.º 4 (octubre de 2016): 370–404. http://dx.doi.org/10.1134/s2079978016040026.

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40

Arshakuni, A. A. y S. P. Gubin. "Natural biofibers as polyfunctional ligands for metal-containing nanoparticles". Russian Journal of Coordination Chemistry 36, n.º 4 (abril de 2010): 249–53. http://dx.doi.org/10.1134/s1070328410040020.

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41

Hanson, M. P., D. C. Driscoll, C. Kadow y A. C. Gossard. "Metal/semiconductor superlattices containing semimetallic ErSb nanoparticles in GaSb". Applied Physics Letters 84, n.º 2 (12 de enero de 2004): 221–23. http://dx.doi.org/10.1063/1.1639932.

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42

Stepanov, A. L., D. E. Hole y P. D. Townsend. "Excimer laser annealing of glasses containing implanted metal nanoparticles". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 166-167 (mayo de 2000): 882–86. http://dx.doi.org/10.1016/s0168-583x(99)00731-4.

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43

Kachan, S. M. y A. N. Ponyavina. "Resonance absorption spectra of composites containing metal-coated nanoparticles". Journal of Molecular Structure 563-564 (mayo de 2001): 267–72. http://dx.doi.org/10.1016/s0022-2860(00)00882-6.

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44

Zhang, Kai, Hongtu Li, Shuang Zhao, Wei Wang, Shuwei Wang, Yaxin Xu, Wenzhi Yu y Jingyuan Wang. "Synthesis and characterization of polymer brushes containing metal nanoparticles". Polymer Bulletin 57, n.º 3 (3 de abril de 2006): 253–59. http://dx.doi.org/10.1007/s00289-006-0554-y.

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45

Azari, Ahmad. "Thermal conductivity modeling of water containing metal oxide nanoparticles". Journal of Central South University 22, n.º 3 (marzo de 2015): 1141–45. http://dx.doi.org/10.1007/s11771-015-2626-3.

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46

Sepahvand, Reza, Mohsen Adeli, Bandar Astinchap y Roya Kabiri. "New nanocomposites containing metal nanoparticles, carbon nanotube and polymer". Journal of Nanoparticle Research 10, n.º 8 (17 de junio de 2008): 1309–18. http://dx.doi.org/10.1007/s11051-008-9411-2.

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47

Angelomé, Paula C. y Luis M. Liz-Marzán. "Synthesis and applications of mesoporous nanocomposites containing metal nanoparticles". Journal of Sol-Gel Science and Technology 70, n.º 2 (10 de diciembre de 2013): 180–90. http://dx.doi.org/10.1007/s10971-013-3238-8.

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Li, Shan Shan, Ying Nan Dong, You Ning Xu, Bing Li y Mei Ling Tang. "Photochemical Synthesis of Pd Core @ Pt Shell Nanoparticles in Polyethylene Glycol (PEG) Solution System". Applied Mechanics and Materials 535 (febrero de 2014): 753–57. http://dx.doi.org/10.4028/www.scientific.net/amm.535.753.

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In the sodium citrate solution systems containing double metal ions with different Pd-Pt molar ratios and single Pt (IV) ions, Pd Core @ Pt Shell nanoparticles were synthesized by the photochemical coreduction and Pd seed method, respectively. By means of characterization of TEM, the change regularity of the composite nanoparticle sizes was studied in both preparation methods. The surface chemical state of the composite nanoparticles and their structure were analyzed by X-ray photoelectron spectroscopy (XPS), confirming that Pd @ Pt nanoparticles formed are core-shell structure. Keywords: Pd Core @ Pt Shell; Photochemical; Simultaneous reduction; Seeding growth

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49

Pushpavanam, Karthik, John Chang, Stephen Sapareto y Kaushal Rege. "Polypeptide-Facilitated Formation of Bimetallic Plasmonic Nanoparticles in Presence of Ionizing Radiation". Nano LIFE 07, n.º 01 (marzo de 2017): 1650006. http://dx.doi.org/10.1142/s1793984416500069.

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Ionizing radiation, which includes X-rays and gamma rays, is used in a variety of different applications, including in human health. However, high levels of exposure can result in significant morbidity and mortality in humans. Molecular and nanoscale systems that can detect different levels of ionizing radiation can ultimately lead to effective sensing platforms for a variety of applications. In the current work, we describe the use of polypeptide-templated formation of bimetallic metal nanoparticles with potential applications as a colorimetric reporter of elevated levels of ionizing radiation typically used in blood irradiation. Cysteine-containing elastin-like polypeptides were employed together with reducing agents in order to engender radiation-facilitated formation of bimetallic gold–silver bimetallic nanoparticles from a mixture of their respective metal salts. This formation of colored nanoparticle dispersions from colorless metal salt solutions acted as a visual reporter of ionizing radiation in the dose range of 25–100 Gy. Nanoparticles were characterized using UV–visible spectroscopy, transmission electron microscopy, elemental analyses and dynamic light scattering. Our results indicate that polypeptide-bimetallic nanoparticle systems may be attractive reporters of elevated levels of ionizing radiation.

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Keast, Vicki J. "Atmospheric Corrosion of Silver and Silver Nanoparticles". Corrosion and Materials Degradation 3, n.º 2 (24 de mayo de 2022): 221–34. http://dx.doi.org/10.3390/cmd3020013.

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Even though it is a noble metal, silver will corrode in ambient atmospheres, predominantly by reacting with sulfur-containing gases such as hydrogen sulfide (H2S) and carbonyl sulfide (OCS) to form the silver sulfide (Ag2S) acanthite. Other aspects of the environment, such as relative humidity and the presence of oxidizing species, also play a critical role. With the emergence of silver nanoparticles for a range of technological and medical applications, there has been a revival of interest in the corrosion behavior of this important metal. This article reviews the current understanding of the atmospheric corrosion of silver in both the bulk and nanoparticle forms. Gaps in our current understanding and areas for future investigation are identified.

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