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Journal articles on the topic 'Matrice nanostructurée'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Yakimchuk, Dzmitry V., Victoria D. Bundyukova, Jon Ustarroz, Herman Terryn, Kitty Baert, Artem L. Kozlovskiy, Maxim V. Zdorovets, et al. "Morphology and Microstructure Evolution of Gold Nanostructures in the Limited Volume Porous Matrices." Sensors 20, no. 16 (August 6, 2020): 4397. http://dx.doi.org/10.3390/s20164397.

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The modern development of nanotechnology requires the discovery of simple approaches that ensure the controlled formation of functional nanostructures with a predetermined morphology. One of the simplest approaches is the self-assembly of nanostructures. The widespread implementation of self-assembly is limited by the complexity of controlled processes in a large volume where, due to the temperature, ion concentration, and other thermodynamics factors, local changes in diffusion-limited processes may occur, leading to unexpected nanostructure growth. The easiest ways to control the diffusion-limited processes are spatial limitation and localized growth of nanostructures in a porous matrix. In this paper, we propose to apply the method of controlled self-assembly of gold nanostructures in a limited pore volume of a silicon oxide matrix with submicron pore sizes. A detailed study of achieved gold nanostructures’ morphology, microstructure, and surface composition at different formation stages is carried out to understand the peculiarities of realized nanostructures. Based on the obtained results, a mechanism for the growth of gold nanostructures in a limited volume, which can be used for the controlled formation of nanostructures with a predetermined geometry and composition, has been proposed. The results observed in the present study can be useful for the design of plasmonic-active surfaces for surface-enhanced Raman spectroscopy-based detection of ultra-low concentration of different chemical or biological analytes, where the size of the localized gold nanostructures is comparable with the spot area of the focused laser beam.

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2

Abdelraheem, Amira, Ahmed H. El-Shazly, and M. F. El-Kady. "Nanofiber Polyaniline and Polyaniline-Clay Nanocomposite Prepared via Sonochemical and Sol-Gel Techniques." Materials Science Forum 860 (July 2016): 12–16. http://dx.doi.org/10.4028/www.scientific.net/msf.860.12.

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Polyaniline (PANI) and polyaniline-clay (PANI-clay) composite nanostructured materials were prepared via both ultrasonic irradiation and sol-gel preparation techniques. The molecular structure of prepared PANI and PANI-clay composite samples were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The characterization results confirm the nanostructure of prepared samples. BET surface area results were obtained for the prepared matrices. TEM and SEM images showed the morphology of the fabricated nanomaterials.

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Gutiérrez González, Jessica, Ruth N. Schmarsow, Úrsula M. Montoya Rojo, Julieta Puig, Walter F. Schroeder, and Ileana Alicia Zucchi. "Block Copolymer Micelles Generated by Crystallization-Driven Self-Assembly in Polymer Matrices." Science Reviews - from the end of the world 1, no. 3 (June 12, 2020): 47–64. http://dx.doi.org/10.52712/sciencereviews.v1i3.17.

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In this review, we show how Crystallization-Driven Self-Assembly (CDSA), a method originally employed for the self-assembly of block copolymers in solution, was extended to the synthesis of elongated micellar nanostructures in polymer matrices. By highlighting some of the works published by our group in this area, the conditions to synthesize nanostructured polymers by CDSA are discussed. The knowledge of these conditions will allow developing a new generation of nanomaterials with tailored architecture based on a given application.

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4

Gasa-Falcon, Ariadna, Isabel Odriozola-Serrano, Gemma Oms-Oliu, and Olga Martín-Belloso. "Nanostructured Lipid-Based Delivery Systems as a Strategy to Increase Functionality of Bioactive Compounds." Foods 9, no. 3 (March 11, 2020): 325. http://dx.doi.org/10.3390/foods9030325.

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Acquisition of a healthy lifestyle through diet has driven the food manufacturing industry to produce new food products with high nutritional quality. In this sense, consumption of bioactive compounds has been associated with a decreased risk of suffering chronic diseases. Nonetheless, due to their low solubility in aqueous matrices, high instability in food products during processing and preparation as well as poor bioavailability, the use of such compounds is sometimes limited. Recent advancements in encapsulation and protection of bioactive compounds has opened new possibilities for the development of novel food products. In this direction, the present review is attempting to describe encapsulation achievements, with special attention to nanostructured lipid-based delivery systems, i.e., nanoemulsions, multi-layer emulsions and liposomes. Functionality of bioactive compounds is directly associated with their bioavailability, which in turn is governed by several complex processes, including the passage through the gastrointestinal tract and transport to epithelial cells. Therefore, an overview of recent research on the properties of these nanostructured lipid-based delivery systems with a strong impact on the functionality of bioactive compounds will be also provided. Nanostructured lipid-based delivery systems might be used as a potential option to enhance the solubility, stability, absorption and, ultimately, functionality of bioactive compounds. Several studies have been performed in this line, modifying the composition of the nanostructures, such as the lipid-type or surfactants. Overall, influencing factors and strategies to improve the efficacy of encapsulated bioactive compounds within nanostructures have been successfully identified. This knowledge can be used to design effective targeted nanostructured lipid-based delivery systems for bioactive compounds. However, there is still a lack of information on food interactions, toxicity and long-term consumption of such nanostructures.

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5

O'Dwyer, C., V. Lavayen, M. A. Santa Ana, E. Benavente, G. González, and C. M. Sotomayor Torres. "Anisotropic Vanadium Oxide Nanostructured Host Matrices for Lithium Ion Intercalation." Research Letters in Physical Chemistry 2007 (August 28, 2007): 1–5. http://dx.doi.org/10.1155/2007/32528.

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We report on unique high-volume low-dimensional V2O5-based turbostratic nanostructures, prepared using sol-gel synthetic methods from V2O5⋅nH2O xerogels. Electrochemical intercalation of Li+ to form Li0.65V2O5 resulted in a maximum measured charge capacity of 1225 mAh g−1 as the β-LixV2O5 phase. Conductivities of the order of 10−3 S cm−1 were found on compressed-nanotube parallelepipedal samples, which exhibit an anisotropy factor of 70 at room temperature by preferential alignment of the nanotubes. The improved electrochemical properties observed in novel vanadium oxide nanostructured arrays are attributed to the increased volumetric density for ion intercalation, shorter diffusion paths to the intercalation sites, and a high degree of crystallinity of the individual nanotubular host structures.

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6

Kosnikov, Gennadiy, Oleg Figovsky, and Adnan Eldarkhanov. "Metal Matrix Micro- and Nanostructural Composites (Review)." Chemistry & Chemical Technology 9, no. 2 (May 15, 2015): 165–70. http://dx.doi.org/10.23939/chcht09.02.165.

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7

Prolongo, S. G., A. Jiménez-Suárez, B. G. Melitón, M. Campo, and A. Ureña. "Optimum Dispersion Technique of Carbon Nanotubes in Epoxy Resin as a Function of the Desired Behaviour." Journal of Nano Research 26 (December 2013): 177–86. http://dx.doi.org/10.4028/www.scientific.net/jnanor.26.177.

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The use of carbon nanostructures for epoxy matrices modification has been widely studied, nevertheless there are several alternative methods for manufacturing that try to avoid difficulties related to their tendency to keep entangled. The use of the calendering approach and high shear mixing alternatives is common for dispersing these nanoreinforcements. The present article compares these two methods as well as possible synergies from the use of the two alternatives together. It has been found that the dispersion technique used modifies the final dispersion level reached as well as on the final properties of the different nanocomposites. Nevertheless, this effect depends on the type of nanoreinforcement (structure and functionalization) and the property measured. Results suggest that each carbon nanostructure requires an individual design of the dispersion stage to get the optimum properties. Thus, the optimum technique may be different depending on the final desired properties, and the dispersion cycle should be designed carefully depending of the final material aim and the nanostructure used. Nevertheless, typical dispersion cycles are currently applied for different type of nanoreinforcements.

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8

Gorokh, G. G., I. A. Taratyn, A. N. Pligovka, A. A. Lazavenka, and A. I. Zakhlebayeva. "AUTOELECTRONIC CATHODES BASED ON ARRAYS OF NIOBIUM-OXIDE COLUMNAR NANOSTRUCTURES FOR FIELD EMISSION DISPLAYS." Doklady BGUIR, no. 7 (125) (December 7, 2019): 51–58. http://dx.doi.org/10.35596/1729-7648-2019-125-7-51-58.

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The article discusses the prospects of creating controlled field-effect cathodes based on arrays of columnar oxide niobium nanostructures for field emission displays. Geometrical models of field-emission cathodes and vacuum elements have been developed and investigated. The distribution of the electric field in the vacuum device at various distances between the cathode and the anode, the applied voltages between them, the shape and microgeometry of the cathodes were obtained. The optimal geometric parameters of nanostructured autoelectronic cathodes and matrices of these were calculated based on the simulation. The technological route has been developed for the production of autoelectronic cathode matrices based on arrays of niobium-oxide columnar nanostructures formed by electrochemical anodization of Al/Nb thin-film system. The samples of controlled arrays of autoelectronic cathodes were fabricated and the current-voltage characteristics with interelectrode gap of 2, 5 and 10 μm in various electric modes with change in the electric field strength from 3 to 85 V/μm were studied. At 2 μm gap between the anode and cathode, the emission occurs at minimum threshold voltages, but it is characterized by limited current values. The increasing in the interelectrode gap allows rising the emission currents, however, the threshold voltages increase. In the pulsed mode, the large emission currents are achieved. The threshold voltage of autoelectronic cathode matrices with interelectrode gap of 5 μm was 9.16 V, the maximum currents reached 350 μA at voltage of 22.5 V. In the pulsed mode, the emission arose at 11.06 V, the maximum current reached 1500 μA at 40 V.

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Kikuchi, Masanori, and M. Tanaka. "Synthesis of Bone-Like Hydroxyapatite/Collagen Nano-Composites by Soft-Nanotechnology." Advances in Science and Technology 49 (October 2006): 1–8. http://dx.doi.org/10.4028/www.scientific.net/ast.49.1.

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Soft-nanotechnologies are based upon the synthesis technologies of nanomaterials and construction technologies of nanostructures by life forms. They are expected as new preparation methods for biomaterials that could be recognized as regular extracellular matrices (ECM) in our body by cells. We applied the soft-nanotechnology to synthesis of artificial bones made of HAp and collagen with bone-like nanostructure and examined their physical and biological properties. The nanocomposite obtained indicates bone-like nanostructure. Computer simulation and FT-IR suggested that the self-organization of HAp and collagen is based on chemical interaction between calcium ions on HAp surface and carboxy groups on collagen. After implantation in rats and dogs, the nanocomposites are resorbed by osteoclasts followed by osteogenesis; therefore, the nanocomposites are recognized as bone in the living body. Resorption rate can be controlled by crosslinkage. We also prepared sponge-like elastic porous body by gel-lyophilization technique using additional small amount of collagen solution. Bone tissue reactions of it are the same as the nanocomposites as prepared. The nanocomposites are now in clinical research in Japan to be commercialized in near future by Pentax Co.

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10

Ferrone, Eloisa, Rodolfo Araneo, Andrea Notargiacomo, Marialilia Pea, and Antonio Rinaldi. "ZnO Nanostructures and Electrospun ZnO–Polymeric Hybrid Nanomaterials in Biomedical, Health, and Sustainability Applications." Nanomaterials 9, no. 10 (October 12, 2019): 1449. http://dx.doi.org/10.3390/nano9101449.

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ZnO-based nanomaterials are a subject of increasing interest within current research, because of their multifunctional properties, such as piezoelectricity, semi-conductivity, ultraviolet absorption, optical transparency, and photoluminescence, as well as their low toxicity, biodegradability, low cost, and versatility in achieving diverse shapes. Among the numerous fields of application, the use of nanostructured ZnO is increasingly widespread also in the biomedical and healthcare sectors, thanks to its antiseptic and antibacterial properties, role as a promoter in tissue regeneration, selectivity for specific cell lines, and drug delivery function, as well as its electrochemical and optical properties, which make it a good candidate for biomedical applications. Because of its growing use, understanding the toxicity of ZnO nanomaterials and their interaction with biological systems is crucial for manufacturing relevant engineering materials. In the last few years, ZnO nanostructures were also used to functionalize polymer matrices to produce hybrid composite materials with new properties. Among the numerous manufacturing methods, electrospinning is becoming a mainstream technique for the production of scaffolds and mats made of polymeric and metal-oxide nanofibers. In this review, we focus on toxicological aspects and recent developments in the use of ZnO-based nanomaterials for biomedical, healthcare, and sustainability applications, either alone or loaded inside polymeric matrices to make electrospun composite nanomaterials. Bibliographic data were compared and analyzed with the aim of giving homogeneity to the results and highlighting reference trends useful for obtaining a fresh perspective about the toxicity of ZnO nanostructures and their underlying mechanisms for the materials and engineering community.

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Vallet-RegÃ, M. "Nanostructured mesoporous silica matrices in nanomedicine." Journal of Internal Medicine 267, no. 1 (January 2010): 22–43. http://dx.doi.org/10.1111/j.1365-2796.2009.02190.x.

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12

Chauhan, Indu, Sudiksha Aggrawal, Chandravati Chandravati, and Paritosh Mohanty. "Metal oxide nanostructures incorporated/immobilized paper matrices and their applications: a review." RSC Advances 5, no. 101 (2015): 83036–55. http://dx.doi.org/10.1039/c5ra13601f.

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13

Yatsyshen, Valeriy, Kseniya Verevkina, and Anton Popov. "Calculation of the Energy Coefficients of Reflection and Transmission for the Layered Periodic Media." NBI Technologies, no. 3 (February 2020): 37–45. http://dx.doi.org/10.15688/nbit.jvolsu.2019.3.6.

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Currently, much attention is paid to the study of photonic crystals – materials with an ordered structure characterized by a strictly periodic change in the refractive index at scales comparable to the wavelengths of radiation in visible and near infrared ranges. This is a dynamically developing direction of modern materials science. It is connected with the possibility of creating LEDs with high efficiency, new types of lasers with low threshold generation, light waveguides, optical switches, filters, as well as digital computing devices based on Photonics. The aim of this work is to calculate the reflection and transmission of a polarized light wave from a layered system of nanostructures that form a periodic medium. The calculation is carried out by two methods: the method of characteristic matrices and the method based on the use of Chebyshev polynomials. The authors have created a basic component of the computer program for calculating the reflection coefficient and the transmittance of layered nanostructures. The paper calculates the spectra of reflection and transmission coefficients and presents the analysis of the results obtained. The basic element is chosen as a basic nanostructure: a layer of magnesium oxide MgO 100 nm thick, a diamond layer 160 nm thick, an arsenic layer AsBr3 tribromide 80 nm thick, a silicon layer 120 nm thick. The authors compare the two methods used: the results are almost the same, which makes it possible in practice for such structures to use a simpler method for the computational procedure based on Chebyshev polynomials.

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Huang, Yu-Hui, Chia-Wei Wang, Wen-Tsen Chen, Li-Yi Chen, and Huan-Tsung Chang. "Nanomaterial based mass spectrometry of oligodeoxynucleotide–drug complexes." Analytical Methods 7, no. 15 (2015): 6360–64. http://dx.doi.org/10.1039/c5ay00990a.

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15

Khatoon, Nafeesa, Mao Quan Chu, and Chun Hui Zhou. "Nanoclay-based drug delivery systems and their therapeutic potentials." Journal of Materials Chemistry B 8, no. 33 (2020): 7335–51. http://dx.doi.org/10.1039/d0tb01031f.

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16

Lamberti, Andrea, Alessandro Virga, Angelo Angelini, Alessandro Ricci, Emiliano Descrovi, Matteo Cocuzza, and Fabrizio Giorgis. "Metal–elastomer nanostructures for tunable SERS and easy microfluidic integration." RSC Advances 5, no. 6 (2015): 4404–10. http://dx.doi.org/10.1039/c4ra12168f.

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17

László, István. "Geometry of nanostructures and eigenvectors of matrices." physica status solidi (b) 250, no. 12 (November 13, 2013): 2732–36. http://dx.doi.org/10.1002/pssb.201300091.

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18

Campuzano, Susana, Paloma Yáñez-Sedeño, and José M. Pingarrón. "Electrochemical Affinity Biosensors Based on Selected Nanostructures for Food and Environmental Monitoring." Sensors 20, no. 18 (September 8, 2020): 5125. http://dx.doi.org/10.3390/s20185125.

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The excellent capabilities demonstrated over the last few years by electrochemical affinity biosensors should be largely attributed to their coupling with particular nanostructures including dendrimers, DNA-based nanoskeletons, molecular imprinted polymers, metal-organic frameworks, nanozymes and magnetic and mesoporous silica nanoparticles. This review article aims to give, by highlighting representative methods reported in the last 5 years, an updated and general overview of the main improvements that the use of such well-ordered nanomaterials as electrode modifiers or advanced labels confer to electrochemical affinity biosensors in terms of sensitivity, selectivity, stability, conductivity and biocompatibility focused on food and environmental applications, less covered in the literature than clinics. A wide variety of bioreceptors (antibodies, DNAs, aptamers, lectins, mast cells, DNAzymes), affinity reactions (single, sandwich, competitive and displacement) and detection strategies (label-free or label-based using mainly natural but also artificial enzymes), whose performance is substantially improved when used in conjunction with nanostructured systems, are critically discussed together with the great diversity of molecular targets that nanostructured affinity biosensors are able to quantify using quite simple protocols in a wide variety of matrices and with the sensitivity required by legislation. The large number of possibilities and the versatility of these approaches, the main challenges to face in order to achieve other pursued capabilities (development of antifouling, continuous operation, wash-, calibration- and reagents-free devices, regulatory or Association of Official Analytical Chemists, AOAC, approval) and decisive future actions to achieve the commercialization and acceptance of these devices in our daily routine are also noted at the end.

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Hazra, Mukul, Sudeshna Chatterjee, and Jayati Datta. "Multi-elemental chalcogeniden-BiCdSe films grown under controlled depth voltammetry: improved photo-electrochemical behaviour toward energy conversion." New Journal of Chemistry 42, no. 12 (2018): 9837–46. http://dx.doi.org/10.1039/c8nj01304g.

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In this study, a combinatorial approach was developed for fabricating nanostructured composite semiconductor matrices, which exhibited promising photo-response, appreciable photo-current potential and enhanced energy conversion efficiency.

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Barisien, Thierry, Laurent Legrand, Zhao Mu, and Sophie Hameau. "Excitonic linewidth of organic quantum wires generated in reduced dimensionality matrices." Physical Chemistry Chemical Physics 18, no. 18 (2016): 12928–37. http://dx.doi.org/10.1039/c6cp00629a.

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Müller, R. H., M. Radtke, and S. A. Wissing. "Nanostructured lipid matrices for improved microencapsulation of drugs." International Journal of Pharmaceutics 242, no. 1-2 (August 2002): 121–28. http://dx.doi.org/10.1016/s0378-5173(02)00180-1.

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Pryjmaková, Jana, Markéta Kaimlová, Tomáš Hubáček, Václav Švorčík, and Jakub Siegel. "Nanostructured Materials for Artificial Tissue Replacements." International Journal of Molecular Sciences 21, no. 7 (April 5, 2020): 2521. http://dx.doi.org/10.3390/ijms21072521.

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This paper review current trends in applications of nanomaterials in tissue engineering. Nanomaterials applicable in this area can be divided into two groups: organic and inorganic. Organic nanomaterials are especially used for the preparation of highly porous scaffolds for cell cultivation and are represented by polymeric nanofibers. Inorganic nanomaterials are implemented as they stand or dispersed in matrices promoting their functional properties while preserving high level of biocompatibility. They are used in various forms (e.g., nano- particles, -tubes and -fibers)—and when forming the composites with organic matrices—are able to enhance many resulting properties (biologic, mechanical, electrical and/or antibacterial). For this reason, this contribution points especially to such type of composite nanomaterials. Basic information on classification, properties and application potential of single nanostructures, as well as complex scaffolds suitable for 3D tissues reconstruction is provided. Examples of practical usage of these structures are demonstrated on cartilage, bone, neural, cardiac and skin tissue regeneration and replacements. Nanomaterials open up new ways of treatments in almost all areas of current tissue regeneration, especially in tissue support or cell proliferation and growth. They significantly promote tissue rebuilding by direct replacement of damaged tissues.

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SASIKALA, N. T., S. BOOMINATHASELLARAJAN, and BALA PRAVEEN CHAKKRAVARTHY RAGHUPATHY. "FABRICATION OF NANOSTRUCTURES USING POROUS ANODIC ALUMINA TEMPLATE." International Journal of Nanoscience 10, no. 04n05 (August 2011): 783–86. http://dx.doi.org/10.1142/s0219581x11008897.

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Nanoporous alumina template was fabricated in dilute oxalic acid solution using a two step anodization process at voltage range of ~34 V. This was used as a template to form nanopillar matrices of copper by metal evaporation and direct deposition. Heat treatment of the copper nanopillars resulted in copper oxide ordered nanostructures which were characterized using electron microscopy. When these nanostructures were used as an electrochemical sensor for quantitative analysis of glucose in aqueous solutions, the electrodes modified with nanopillars showed a high degree of sensitivity compared to flat electrodes.

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VAUCHELET, NICOLAS. "DIFFUSIVE TRANSPORT OF PARTIALLY QUANTIZED PARTICLES: L log L SOLUTIONS." Mathematical Models and Methods in Applied Sciences 18, no. 04 (April 2008): 489–510. http://dx.doi.org/10.1142/s0218202508002759.

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The paper is devoted to the analysis of a drift-diffusion-Schrödinger–Poisson (DDSP) system. From the physical point of view, it describes the transport of a quasi-bidimensional electron gas confined in a nanostructure. Existence, uniqueness and long-time behavior of a weak solution were already obtained in Ref. 8 for constant scalar diffusion matrices. Here, we develop an L log L existence theory for the DDSP system for a general class of smooth diffusion matrices. Our argument relies on a Trudinger estimate for the entropy functional and a sharp bound on the Hamiltonian's spectrum.

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Belyanin, Alexey, Alexander Bagdasarian, Sergey Bagdasarian, Petr Luchnikov, and Natalya Katakhova. "Magnetic Nanocomposites Based on Opal Matrices." Key Engineering Materials 781 (September 2018): 149–54. http://dx.doi.org/10.4028/www.scientific.net/kem.781.149.

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Features of obtaining magnetic nanocomposites based on the lattice packing of SiO2 nanoscale (opal matrices) with clusters of multiferroic materials (Li-Zn, Bi, Fe, Dy, Gd and Yb titanates) in their interstitial cavities have been considered. For magnetic nanocomposites creation opal matrices with SiO2 nanoscale of ~ 260 nm in diameter have been used. The composition of nanocomposites has been also studied using X-ray diffractometry and Raman spectroscopy. The results of the frequency dependences measurement for the dielectric constant of the nanostructures obtained have been presented. Hysteresis loops have been examined for the samples obtained in the temperature range from 2 to 400 K.

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Nunes, D., J. B. Correia, and P. A. Carvalho. "Nanodiamond Dispersions in Nanostructured Metals." Microscopy and Microanalysis 18, S5 (August 2012): 73–74. http://dx.doi.org/10.1017/s1431927612013025.

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A microstructure refined to the nanometer scale originates mechanical property improvements [1]. However ultra-fine grain metals present low thermal stability, requiring the presence of particle dispersions to delay coarsening by grain boundary pinning. Nanoscale dispersions of diamond or graphite offer therefore thermal stability potential, combined with high hardness and thermal conductivity for diamond, and self-lubricating properties in the case of graphite. Copper-diamond (Cu-nD) and copper-graphite (Cu-G), nickel-diamond (Ni-nD) and nickel-graphite (Ni-G), as well as tungsten-diamond (W-nD) and tungsten-graphite (W-G) nanostructured composites have been produced by mechanical synthesis and subsequent heat-treatments. Fundamental challenges involve bonding carbon phases to the chosen matrices: copper exhibits an intrinsically difficult bonding with carbon; while tungsten is a strong carbide former; with Ni exhibiting intermediate characteristics. In addition, carbon phases are prone to amorphization by high-energy milling. Transmission electron microscopy (TEM) observations showed homogeneous particle distributions and intimate bonding between the metallic matrix and the carbon phases. Ring diffraction patterns of the chemically extracted carbon phases demonstrated that nanodiamond milled with Cu preserved crystallinity (Figure 1), while an essentially amorphous nature could be inferred for graphite. Systematic variation of the processing parameters enabled to minimize carbide formation with Ni and W matrices. Heat-treatment of the nanostructured of Ni-nD composites induced the transformation of nanodiamond into onion-like carbons (OLC) inside the Ni nanostructured matrix (Figure 2). Hardening mechanisms and the load transfer ability to the reinforcement particles, as well as thermal stability, have been evaluated through microhardness tests.

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Урюпин, О. Н., and А. А. Шабалдин. "Установка по измерению термоэлектрических свойств ультратонких проволок." Физика и техника полупроводников 53, no. 5 (2019): 702. http://dx.doi.org/10.21883/ftp.2019.05.47567.25.

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AbstractAn experimental setup is developed to measure the thermoelectric properties of semiconductor nanowires with diameters of up to 5 nm in dielectric matrices. This setup makes it possible to measure the electrical resistance and thermoelectric power of nanostructured samples in the temperature range of 77–400 K.

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Fuchs, Konrad, Thorsten Bauer, Ralf Thomann, Chun Wang, Christian Friedrich, and Rolf Mülhaupt. "Nanostructure Formation via Association of Tectons in Amorphous Polymer Matrices." Macromolecules 32, no. 25 (December 1999): 8404–12. http://dx.doi.org/10.1021/ma9912406.

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Ulbrich, Stefan, Jens Friedrichs, Monika Valtink, Simo Murovski, Clemens M. Franz, Daniel J. Müller, Richard H. W. Funk, and Katrin Engelmann. "Retinal Pigment Epithelium Cell Alignment on Nanostructured Collagen Matrices." Cells Tissues Organs 194, no. 6 (2011): 443–56. http://dx.doi.org/10.1159/000323653.

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Fernández-Blázquez, Juan P., Sandro Setzer, and Aránzazu del Campo. "Nanostructured Polymer Fibers with Enhanced Adhesion to Epoxy Matrices." Plasma Processes and Polymers 10, no. 3 (November 5, 2012): 207–12. http://dx.doi.org/10.1002/ppap.201200105.

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Muñoz-Rojas, David, Judith Oró-Solé, Omar Ayyad, and Pedro Gómez-Romero. "Shaping hybrid nanostructures with polymer matrices: the formation mechanism of silver–polypyrrole core/shell nanostructures." J. Mater. Chem. 21, no. 7 (2011): 2078–86. http://dx.doi.org/10.1039/c0jm01449d.

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Salem, Hanadi G., Sherif El-Eskandarany, Amr Kandil, and Hassan Abdul Fattah. "Bulk Behavior of Ball Milled AA2124 Nanostructured Powders Reinforced with TiC." Journal of Nanomaterials 2009 (2009): 1–12. http://dx.doi.org/10.1155/2009/479185.

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In the current research work, a top-down approach was employed for the refinement of a micron scale AA2124 alloy powder 40 μm in average size using high-energy ball milling up to 60 hours. The produced nanopowders were investigated compared to the micron gas atomized powder both in the monolithic and the reinforced composite states. 1 μm powder of TiC with internal structure <100 nm was used for the reinforcement of the 2124-Al matrices. Milling time of 36 hours produced a <100 nm nanopowders with internal structure size <20 nm. The nanopowder monolithic consolidates exhibited compressive strength of 388 MPa compared to 313 MPa for micronpowder one. Addition of TiC nanostructured powder to the nanopowder consolidated matrix resulted in increase of 130% in compressive strength compared to that produced for the microscale one. Nanopowder of Alalloys produced by mechanical milling reinforced with 10 wt% TiC is recommended for products suitable for high wear and erosion resistance applications. Peak aging increased the hardness and compressive strength of the as compacted micronpowder matrices by an average of 188% and 123%, while increased that of the nanopowder matrices by an average of 110% and 117%, respectively.

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Dynich, R. A., A. D. Zamkovets, A. N. Ponyavina, and E. М. Shpilevsky. "Dependence of a surface plasmon resonance absorption band on the concentration of gold nanoparticles in carbon-bearing matrixes." Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series 55, no. 2 (June 28, 2019): 232–41. http://dx.doi.org/10.29235/1561-2430-2019-55-2-232-241.

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For fullerene matrixes doped by gold nanoparticles we have established experimentally a miss of a red concentration-induced shift of surface plasmon resonance absorption band maximum. Theoretical modeling has been made for spectral characteristics of carbon–bearing nanostructures. Numerical calculations of extinction factors for a spherical metallic particle in an absorbing surrounding medium were based on the Mie theory. Transmission spectra coefficients of densely packed plasmonic nanoparticles monolayers were calculated with the use of the single coherent scattering approximation modified for absorbing matrices. Thin-film Au-air and Au–C60 nanostructures have been fabricated on glass and quartz substrates by thermal evaporation and condensation in vacuum at an air pressure of 2 · 10–3 Pа. The surface mass density of Au into Au–C60 nanostructures was varied in the range (3.86–7.98) · 10–6 g/cm2. The comparison of theoretical and experimental data allowed making a conclusion that the absorbency in carbon-bearing matrix leads to the attenuation of lateral electrodynamics coupling and blocks collective plasmon resonance in densely packed gold nanostructures.

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34

de la Rosa-Fox, Nicolás, Victor Morales-Flórez, Manuel Piñero, and Luis Maria Esquivias Fedriani. "NanoStructured Sonogels." Key Engineering Materials 391 (October 2008): 45–78. http://dx.doi.org/10.4028/www.scientific.net/kem.391.45.

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Acoustic cavitation effects in sol-gel liquid processing permits to obtain nanostructured materials, with size-dependent properties. The so-called “hot spots” produce very high temperatures and pressures which act as nanoreactors. Ultrasounds force the dissolution and the reaction stars. The products (alcohol, water and silanol) help to continue the dissolution, being catalyst content, temperature bath and alkyl group length dependent. Popular choices used in the preparation of silica-based gels are tetramethoxysilane (TMOS), Si(OCH3)4, and tetraethoxysilane (TEOS), Si(OC2H5)4. The resultant “sonogels” are denser gels with finer and homogeneous porosity than those of classic ones. They have a high surface/volume ratio and are built by small particles (1 nm radius) and a high cross-linked network with low –OH surface coverage radicals. In this way a cluster model is presented based on randomly-packed spheres in several hierarchical levels that represent the real sonoaerogel. Organic modified silicates (ORMOSIL) were obtained by supercritical drying in ethanol of the corresponding alcogel producing a hybrid organic/inorganic aerogel. The new material takes the advantages of the organic polymers as flexibility, low density, toughness and formability whereas the inorganic part contributes with surface hardness, modulus strength, transparency and high refractive index. The sonocatalytic method has proven to be adequate to prepare silica matrices for fine and uniform dispersion of CdS and PbS quantum dots (QDs), which show exciton quantum confinement. We present results of characterization of these materials, such as nitrogen physisorption, small angle X-ray/neutrons scattering, electron microscopy, uniaxial compression and nanoindentation. Finally these materials find application as biomaterials for tissue engineering and for CO2 sequestration by means the carbonation reaction.

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Isaeva, Vera I., Kostantinos E. Papathanasiou, and Leonid M. Kustov. "Zeolite-Like Boron Imidazolate Frameworks (BIFs): Synthesis and Application." Crystals 10, no. 7 (July 15, 2020): 617. http://dx.doi.org/10.3390/cryst10070617.

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This review is devoted to discussion of the latest advances in design and applications of boron imidazolate frameworks (BIFs) that are a particular sub-family of zeolite-like metal–organic frameworks family. A special emphasis is made on nanostructured hybrid materials based on BIF matrices and their modern applications, especially in environment remediation and energy conversion.

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Harper, Jason C., Constantine Y. Khirpin, Eric C. Carnes, Carlee E. Ashley, DeAnna M. Lopez, Travis Savage, Howland D. T. Jones, et al. "Cell-Directed Integration into Three-Dimensional Lipid−Silica Nanostructured Matrices." ACS Nano 4, no. 10 (September 17, 2010): 5539–50. http://dx.doi.org/10.1021/nn101793u.

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Beltiukov, A., R. Valeev, and R. Zakirova. "Optical properties of Ge nanostructures embedded into porous alumina matrices." Materials Research Express 3, no. 4 (April 18, 2016): 045901. http://dx.doi.org/10.1088/2053-1591/3/4/045901.

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Tan, Wei, Raj Krishnaraj, and Tejal A. Desai. "Evaluation of Nanostructured Composite Collagen–Chitosan Matrices for Tissue Engineering." Tissue Engineering 7, no. 2 (April 2001): 203–10. http://dx.doi.org/10.1089/107632701300062831.

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39

Gaines, Michelle K., Steven D. Smith, Jon Samseth, Saad A. Khan, and Richard J. Spontak. "Nanoparticle Network Formation in Nanostructured and Disordered Block Copolymer Matrices." Nanoscale Research Letters 5, no. 10 (September 14, 2010): 1712–18. http://dx.doi.org/10.1007/s11671-010-9775-y.

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40

Fedosyuk, V. M. "Matrices, based on nanostructured porous anodic alumina, for functional applications." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 66, no. 1 (April 2, 2021): 37–46. http://dx.doi.org/10.29235/1561-8358-2021-66-1-37-46.

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Two-step electrochemical anodization was used for obtaining matrices based on porous anodic alumina (MPAA). Three series of experimental samples were made: 1 – PAAM with thickness 1.3–2.5 μm and 70 nm diameter, 2 – 70.0 μm thickness and 50–75 nm diameter and 3 – 13.5–60.0 μm thickness and 100–200 nm diameter. The pore filling of MPAA was realized using electrochemical deposition. As a result Ni nanopillars, Ni and multilayered Cu/CoNi nanowires were formed. The scanning electron microscopy, vibrating magnetometry, voltammetry techniques and four-probe method were used for experimental samples investigations. The magnetic characteristics of Ni nanowires showed that nanowires in MPAA have ferromagnetic properties, since the coercitivity riches up to 750 kOe and squareness ratio up to 0.65. The study of the electrochemical behavior of the Ti/Al2O3/Ni nanocomposite material in the potential range from –450 to +450 mV in 0.9 % NaCl aqueous solution demonstrated its high corrosion resistance properties. The correlation of the GMR of multilayered Cu/CoNi nanowires to the topological parameters of MPAA, the number of layers, the MPAA and partial layers thickness, and chemical purity has been determined. Thus, it has been demonstrated the prospects of use of matrices based on porous anodic alumina as a base material for the template synthesis of functional ferromagnetic nanomaterials for various practical applications.

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41

Иванов, К. А., А. Р. Губайдуллин, and М. А. Калитеевский. "Квантование электромагнитного поля в трехмерных фотонных структурах на основе формализма матрицы рассеяния (S-квантование)." Физика и техника полупроводников 52, no. 9 (2018): 1023. http://dx.doi.org/10.21883/ftp.2018.09.46150.8796.

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AbstractA technique for quantization of the electromagnetic field in photonic nanostructures with three-dimensional modulation of the dielectric constant is developed on the basis of the scattering matrix formalism ( S quantization in the three-dimensional case). Quantization is based on equating the eigenvalues of the scattering matrix to unity, which is equivalent to equating each other the sets of Fourier expansions for the fields of the waves incident on the structure and propagating away from the structure. The spatial distribution of electromagnetic fields of the modes in a photonic nanostructure is calculated on the basis of the R and T matrices describing the reflection and transmission of the Fourier components by the structure. To calculate the reflection and transmission coefficients of individual real-space and Fourier-space components, the structure is divided into parallel layers within which the dielectric constant varies as a function of two-dimensional coordinates. Using the Fourier transform, Maxwell’s equations are written in the form of a matrix connecting the Fourier components of the electric field at the boundaries of neighboring layers. Based on the calculated reflection and transmission vectors for all polarizations and Fourier components, the scattering matrix for the entire structure is formed and quantization is carried out by equating the eigenvalues of the scattering matrix to unity. The developed method makes it possible to obtain the spatial profiles of eigenmodes without solving a system of nonlinear integro-differential equations and significantly reduces the computational resources required for calculating the probability of spontaneous emission in three-dimensional systems.

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42

Homaunmir, V., S. H. Tohidi, G. Grigorya, and M. Ayatollah Zada Shirazi. "Dependence Properties of Sol-Gel Derived CuO@SiO2 Nanostructure to Diverse Concentrations of Copper Oxide." Journal of Nanoparticles 2013 (September 19, 2013): 1–5. http://dx.doi.org/10.1155/2013/156813.

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Various concentrations of copper oxide were embedded into silica matrix of xerogel forms using copper source Cu(NO3)2·3H2O. The xerogel samples were prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) with determination of new molar ratios of the components by the sol-gel method. In this paper, three samples of copper oxide were doped into silica matrices using different concentrations. We obtained 10, 20, and 30 wt.% of copper oxide in silica matrices labeled as A, B, and C, respectively. The absorption and transmittance spectra of the gel matrices were treated at different concentrations by Uv-vis spectrophotometer. Quantities of water and transparency in the silica network change the spectral characteristics of Cu2+ ions in the host silica. Absorption spectra of the samples heated to higher concentration complete the conversion of Cu2+ ions to Cu+ ions. The effects of concentration of copper oxide were characterized by X-ray diffraction (XRD) patterns, and the transmission electron microscope (TEM) micrographs. Also, textural properties of samples were studied by surface area analysis (BET method) at different concentrations.

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KOMATSU, T., D. KIM, T. KOBAYASHI, K. WATANABE, V. F. AGUEKIAN, T. KARASAWA, I. AKAI, and T. IIDA. "SIZE EFFECTS OF EXCITONS OF BiI3 IN LAYERED MATRICES." Surface Review and Letters 03, no. 01 (February 1996): 1127–31. http://dx.doi.org/10.1142/s0218625x96002011.

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The size effects on the exciton absorption and luminescence spectra are studied in nanostructure of BiI 3 embedded in the matrices of bulk BiI 3 and CdI 2 crystals. The quantum-confined exciton states are observed as the absorption lines of the series W J (J=I, II, III, …). The results are compared with a model calculation of the confined excitons in the disks with thickness L z and radius R. The disk-size distribution is directly observed with a high-resolution electron microscope. The relaxed luminescence from the BiI 3 disks in CdI 2 matrix is analyzed by the model of the confined excition interacting with acoustic phonons by taking into account the size-dependent Stokes shift and the distribution of the disk size.

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44

Colomban, Philippe. "Sol-gel control of the micro/nanostructure of functional ceramic-ceramic and metal-ceramic composites." Journal of Materials Research 13, no. 4 (April 1998): 803–11. http://dx.doi.org/10.1557/jmr.1998.0102.

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The problems encountered to tailor simultaneously various specific chemical or physical properties are discussed. Selected polymeric precursors used in association with fine powders allow the control of the nano/microstructure of composites and hence the preparation of functional (FGM) and hierarchical reinforced (HRC) composites, making it possible to combine several kinds of fibers, interphases, and matrices in the same composite (hot microwave absorbent), to control the fiber/matrix interface (long life times composites), to achieve net-shape sintering of 3D composite matrices, and to prepare thick films of metal-ceramic composites with tailored microwave absorption (radar stealthiness).

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Aminorroaya Yamini, S., D. R. G. Mitchell, and M. Avdeev. "In situ characterisation of nanostructured multiphase thermoelectric materials at elevated temperatures." Physical Chemistry Chemical Physics 18, no. 48 (2016): 32814–19. http://dx.doi.org/10.1039/c6cp05232k.

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Multiphase thermoelectric materials exhibit higher efficiencies than their single-phase counterparts. Here, we performed in situ high temperature structural characterisations and shown a strong chemical interaction between secondary phases and matrices at elevated temperatures.

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46

Nunes, D., J. B. Correia, and P. A. Carvalho. "Nanodiamond dispersions in metallic matrices with different carbon affinity." Microscopy and Microanalysis 19, S4 (August 2013): 121–22. http://dx.doi.org/10.1017/s1431927613001220.

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Dispersing nanodiamond (nD) particles in metallic matrices can be achieved by ball milling resulting in metal-diamond composite powders. The matrices have been selected considering the whole range of carbon affinity: copper that shows extremely reduced affinity towards carbon phases, potentially compromising the composite interfaces, and nickel and tungsten that are mild and strong carbide formers, respectively, displaying thus intermediate and strong carbon affinities. For the latter matrices, dispersing carbon phases represent a challenge due to carbide conversion.The materials produced are designated as Cu-10nD, Ni-10nD and W-20nD (where 10 and 20 indicate the atomic fraction of nD). Close monitoring of the milling conditions enabled to homogeneously disperse the carbon phases and obtain nanostructured matrices (Figures 1 (a-c)), as well as to minimize milling media contamination and carbide formation, especially in the case of the W-based composite. Apparent interfacial bonding could be inferred the from transmission electron microscopy (TEM) images.The metallic matrices have been subsequently dissolved to allow for a detailed analysis of nanodiamond. Electron diffraction demonstrated that its crystalline structure was preserved during milling (Figure 2). Microhardness measurements revealed remarkable strength enhancements of the nanostructured composites over that of pure metals of comparable grain sizes (Table 1). The strengthening mechanisms that justify the hardness increments in Cu-10nD and Ni-10nD include second-phase reinforcement (due to the potential load bearing ability of diamond), as well as Orowan and solid solution strengthening. The hardening effect observed in the W-20nD composite over that of pure milled tungsten is probably related to the nanodiamond reinforcement, nevertheless the influence of a fine dispersion of carbides cannot be ruled out.This work has been performed under the Contract of Association between EURATOM and Instituto Superior Tecnico. Financial support was also received from the Fundação para a Ciência Tecnologia (FCT) grants with references PTDC/CTM/100163/2008, Pest-OE/SADG/LA0010/2011 and PEST-OE/CTM-UI0084/2011.

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Ghelich, Raziyeh, Rouhollah Mehdinavaz Aghdam, and Mohammad Reza Jahannama. "Elevated temperature resistance of SiC-carbon/phenolic nanocomposites reinforced with zirconium diboride nanofibers." Journal of Composite Materials 52, no. 9 (September 14, 2017): 1239–51. http://dx.doi.org/10.1177/0021998317723447.

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Carbon fiber-reinforced composites with matrices containing ultra-high temperature ceramics show excellent potential as high ablation-resistant materials. In this study, two non-oxide nanostructures, ZrB2 nanofibers and SiC nanoparticles, as reinforcement phases were utilized to develop the carbon/phenolic-ZrB2-SiC (C/Ph-ZS) nanocomposite for the first time. Thermogravimetry analysis illustrated that the residue yield of C/Ph composite at high temperatures was increased by the introduction of above-mentioned nanostructure ceramics. The addition of 7 wt% of ZrB2/SiC nanoadditives homogeneously in a C/Ph composite resulted in an enhancement of the room temperature thermal diffusivity, from 0.00622 to 0.00728 cm2/s. The incorporation of 4–7 wt% of ZrB2/SiC nanofillers in C/Ph composites leads to a reinforced material with about 73% increasing of Shore D hardness. The modified thermal behavior of prepared nanocomposites was examined using oxyacetylene torch at 2500℃ for 160 s. It suggested that the C/Ph-ZS7% nanocomposites with lower density may drastically contribute to meliorate the thermal insulation and ablative properties. The linear ablation rates of C/Ph composites were decreased after adding 7 wt% ZrB2/SiC nanofillers by 18%. The formation of a dense and uniform SiO2 and ZrO2 layer on the ablated surface of C/Ph-ZS nanocomposites could function as an effective oxygen barrier which greatly reduced the ablation rates of the nanocomposites because of the evaporation at elevated temperature, which absorbs heat from the flame and reduces the erosive attack to C/Ph. The ablated C/Ph-ZS nanocomposite with complicated cross-section structure displayed four dense oxidized, porous surface, transient and matrix regions.

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Silchenko, O. B., M. V. Siluyanova, V. Е. Nizovtsev, D. A. Klimov, and A. A. Kornilov. "On the prospects of application of nanostructured heterophase polyfunctional composite materials inengine building industry." Voprosy Materialovedeniya, no. 1(93) (January 6, 2019): 50–57. http://dx.doi.org/10.22349/1994-6716-2018-93-1-50-57.

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The paper gives a brief review of properties and applications of developed extra-hard nanostructured composite materials and coatings based on them. The presentresearch suggestsaerospace applications of nanostructured composite materials based on carbides, carbonitrides and diboridesof transition and refractory metals. To improve the technical and economic performance of gas turbine engines, it is advisable to use new composite structural materials whose basic physicomechanical properties are several times superior to traditional ones. The greatest progress in developing new composites should be expected in the area of materials created on the basis of polymer, metal, intermetallic and ceramic matrices. Currently components and assemblies of gas turbine engines and multiple lighting power units with long operation life and durability will vigorously develop. Next-generation composites are studied in all developed countries, primarily in the United States and Japan.

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Korolev, E. V., V. A. Smirnov, and A. V. Evstigneev. "Nanostructure of matrices for sulfur constructional composites: methodolody, Methods and research tools." Nanotechnologies in Construction: A Scientific Internet-Journal 6, no. 6 (December 22, 2014): 130–48. http://dx.doi.org/10.15828/2075-8545-2014-6-6-106-148.

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Feldgitscher, Claudia, Herwig Peterlik, Sorin Ivanovici, Michael Puchberger, and Guido Kickelbick. "Crosslinked hybrid polymer matrices with nanostructure directing abilities for lanthanum hydroxide growth." Chemical Communications, no. 37 (2009): 5564. http://dx.doi.org/10.1039/b909923a.

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