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Artículos de revistas sobre el tema "Nanostructured materials, porous materials"

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Autor: Grafiati

Publicado: 7 de septiembre de 2023

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1

Chen, Huige, Run Shi y Tierui Zhang. "Nanostructured Photothermal Materials for Environmental and Catalytic Applications". Molecules 26, n.º 24 (13 de diciembre de 2021): 7552. http://dx.doi.org/10.3390/molecules26247552.

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Solar energy is a green and sustainable clean energy source. Its rational use can alleviate the energy crisis and environmental pollution. Directly converting solar energy into heat energy is the most efficient method among all solar conversion strategies. Recently, various environmental and energy applications based on nanostructured photothermal materials stimulated the re-examination of the interfacial solar energy conversion process. The design of photothermal nanomaterials is demonstrated to be critical to promote the solar-to-heat energy conversion and the following physical and chemical processes. This review introduces the latest photothermal nanomaterials and their nanostructure modulation strategies for environmental (seawater evaporation) and catalytic (C1 conversion) applications. We present the research progress of photothermal seawater evaporation based on two-dimensional and three-dimensional porous materials. Then, we describe the progress of photothermal catalysis based on layered double hydroxide derived nanostructures, hydroxylated indium oxide nanostructures, and metal plasmonic nanostructures. Finally, we present our insights concerning the future development of this field.

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2

Menzel, Nadine, Erik Ortel, Ralph Kraehnert y Peter Strasser. "Electrocatalysis Using Porous Nanostructured Materials". ChemPhysChem 13, n.º 6 (14 de febrero de 2012): 1385–94. http://dx.doi.org/10.1002/cphc.201100984.

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3

Manova, Elina, Pilar Aranda, M. Angeles Martín-Luengo, Sadok Letaïef y Eduardo Ruiz-Hitzky. "New titania-clay nanostructured porous materials". Microporous and Mesoporous Materials 131, n.º 1-3 (junio de 2010): 252–60. http://dx.doi.org/10.1016/j.micromeso.2009.12.031.

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4

Zhang, Xin Xin, Ying Xia Jin, Hai Peng Wang y Yu Yang. "Development and Application of Porous Anodic Alumina Template". Applied Mechanics and Materials 320 (mayo de 2013): 558–66. http://dx.doi.org/10.4028/www.scientific.net/amm.320.558.

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Various porous alumina structures are formed in different electrolyte systems. Adjusting the anodizing parameters can yield different apertures and regularities of the porous alumina template. Thus, porous alumina is widely applied in the preparation of ordered nanostructured materials. This study introduces the porous alumina structure, including its formation mechanism, manufacturing technology, and application in the manufacture of nanostructure materials.

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5

Kajii, H., H. Take y K. Yoshino. "Novel Properties of periodic porous nanostructured carbon materials". Synthetic Metals 121, n.º 1-3 (marzo de 2001): 1315–16. http://dx.doi.org/10.1016/s0379-6779(00)01296-0.

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6

Moshnikov, Vyacheslav A., Irina E. Gracheva, Vladimir V. Kuznezov, Alexsandr I. Maximov, Svetlana S. Karpova y Alina A. Ponomareva. "Hierarchical nanostructured semiconductor porous materials for gas sensors". Journal of Non-Crystalline Solids 356, n.º 37-40 (agosto de 2010): 2020–25. http://dx.doi.org/10.1016/j.jnoncrysol.2010.06.030.

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7

Zemtsova, Elena, Denis Yurchuk y Vladimir Smirnov. "The Process of Nanostructuring of Metal (Iron) Matrix in Composite Materials for Directional Control of the Mechanical Properties". Scientific World Journal 2014 (2014): 1–12. http://dx.doi.org/10.1155/2014/979510.

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We justified theoretical and experimental bases of synthesis of new class of highly nanostructured composite nanomaterials based on metal matrix with titanium carbide nanowires as dispersed phase. A new combined method for obtaining of metal iron-based composite materials comprising the powder metallurgy processes and the surface design of the dispersed phase is considered. The following stages of material synthesis are investigated: (1) preparation of porous metal matrix; (2) surface structuring of the porous metal matrix by TiC nanowires; (3) pressing and sintering to give solid metal composite nanostructured materials based on iron with TiC nanostructures with size 1–50 nm. This material can be represented as the material type “frame in the frame” that represents iron metal frame reinforcing the frame of different chemical compositions based on TiC. Study of material functional properties showed that the mechanical properties of composite materials based on iron with TiC dispersed phase despite the presence of residual porosity are comparable to the properties of the best grades of steel containing expensive dopants and obtained by molding. This will solve the problem of developing a new generation of nanostructured metal (iron-based) materials with improved mechanical properties for the different areas of technology.

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8

Zheng, Xin, Keliang Jiang, Linlin Zhang y Cheng Wang. "N-doped 3D porous carbon materials derived from hierarchical porous IRMOF-3 using a citric acid modulator: fabrication and application in lithium ion batteries as anode materials". Dalton Transactions 49, n.º 27 (2020): 9369–76. http://dx.doi.org/10.1039/d0dt01706j.

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N-doped 3D porous carbon nanostructured materials exhibiting excellent lithium storage capacity and cycling stability when used as anode materials for LIBs were fabricated by calcinating hierarchical porous IRMOF-3 materials.

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9

Li, Chenyang, Jiaqian Qin, Montree Sawangphruk, Xinyu Zhang y Riping Liu. "Rational design and synthesis of SiC/TiC@SiOx/TiO2 porous core–shell nanostructure with excellent Li-ion storage performance". Chemical Communications 54, n.º 89 (2018): 12622–25. http://dx.doi.org/10.1039/c8cc07673a.

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Porous SiC/TiC@TiO₂/SiO_x core–shell nanostructure can be fabricated by partial oxidation of Ti₃SiC₂-derived SiC/TiC nanostructured materials for excellent Li ion storage performance.

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10

Alfarisa, Suhufa, Suriani Abu Bakar, Azmi Mohamed, Norhayati Hashim, Azlan Kamari, Illyas Md Isa, Mohamad Hafiz Mamat, Abdul Rahman Mohamed y Mohamad Rusop Mahmood. "Carbon Nanostructures Production from Waste Materials: A Review". Advanced Materials Research 1109 (junio de 2015): 50–54. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.50.

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Research innovation in finding new carbon sources for carbon nanostructured material production was intensively done lately. In this review, we present the production of carbon nanostructures such as carbon fibers, nanotubes, nanowhiskers, microspheres and porous carbon from several waste materials. The benefit of the use of waste materials such as waste cooking palm oil, chicken fat, waste natural oil, glycerol, printed circuit board, plastic wastes, waste engine oil, scrap tyre, heavy oil residue and deoiled asphalt is not only in the term of their environmentally friendly approach but also the economic value to reduce the high cost of carbon material production using common sources. On the other hand, these materials are easy access sources and can be alternative utilization to convert waste materials into high value nanomaterials.

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11

Cheung, Maurice C., Ka Yi Yung, Huina Xu, Nadine D. Kraut, Ke Liu, Vamsy P. Chodavarapu, Alexander N. Cartwright y Frank V. Bright. "Porous Nanostructured Encapsulation and Immobilization Materials for Optical Biosensors". IEEE Journal of Selected Topics in Quantum Electronics 18, n.º 3 (mayo de 2012): 1147–59. http://dx.doi.org/10.1109/jstqe.2011.2165276.

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12

Panella, Barbara y Michael Hirscher. "Raman studies of hydrogen adsorbed on nanostructured porous materials". Physical Chemistry Chemical Physics 10, n.º 20 (2008): 2910. http://dx.doi.org/10.1039/b719678d.

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13

Lu, A. H. y F. Schüth. "Nanocasting: A Versatile Strategy for Creating Nanostructured Porous Materials". Advanced Materials 18, n.º 14 (18 de julio de 2006): 1793–805. http://dx.doi.org/10.1002/adma.200600148.

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14

Zhang, Xue-Jun, Tian-Yi Ma y Zhong-Yong Yuan. "Nanostructured Titania–Diphosphonate Hybrid Materials with a Porous Hierarchy". European Journal of Inorganic Chemistry 2008, n.º 17 (junio de 2008): 2721–26. http://dx.doi.org/10.1002/ejic.200701368.

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15

Pryjmaková, Jana, Markéta Kaimlová, Tomáš Hubáček, Václav Švorčík y Jakub Siegel. "Nanostructured Materials for Artificial Tissue Replacements". International Journal of Molecular Sciences 21, n.º 7 (5 de abril de 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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16

Islam, Md Shahinul, Mahfuza Mubarak y Ha-Jin Lee. "Hybrid Nanostructured Materials as Electrodes in Energy Storage Devices". Inorganics 11, n.º 5 (24 de abril de 2023): 183. http://dx.doi.org/10.3390/inorganics11050183.

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The global demand for energy is constantly rising, and thus far, remarkable efforts have been put into developing high-performance energy storage devices using nanoscale designs and hybrid approaches. Hybrid nanostructured materials composed of transition metal oxides/hydroxides, metal chalcogenides, metal carbides, metal–organic frameworks, carbonaceous compounds and polymer-based porous materials have been used as electrodes for designing energy storage systems such as batteries, supercapacitors (SCs), and so on. Different kinds of hybrid materials have been shown to be ideal electrode materials for the development of efficient energy storage devices, due to their porous structures, high surface area, high electrical conductivity, charge accommodation capacity, and tunable electronic structures. These hybrid materials can be synthesized following various synthetic strategies, including intercalative hybridization, core–shell architecture, surface anchoring, and defect control, among others. In this study, we discuss applications of the various advanced hybrid nanostructured materials to design efficient batteries and SC-based energy storage systems. Moreover, we focus on their features, limitations, and real-time resolutions.

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17

Hu, Fei, Bin Yan, Erhui Ren, Yingchun Gu, Shaojian Lin, Lanlin Ye, Sheng Chen y Hongbo Zeng. "Constructing spraying-processed complementary smart windows via electrochromic materials with hierarchical nanostructures". Journal of Materials Chemistry C 7, n.º 47 (2019): 14855–60. http://dx.doi.org/10.1039/c9tc04204k.

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18

Li, Chunyang, Yan Liu, Guojun Li y Ruiming Ren. "Preparation and electrochemical properties of nanostructured porous spherical NiCo2O4 materials". RSC Advances 10, n.º 16 (2020): 9438–43. http://dx.doi.org/10.1039/d0ra00259c.

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19

Mondal, Kunal, Monsur Islam, Srujan Singh y Ashutosh Sharma. "Fabrication of High Surface Area Microporous ZnO from ZnO/Carbon Sacrificial Composite Monolith Template". Micromachines 13, n.º 2 (20 de febrero de 2022): 335. http://dx.doi.org/10.3390/mi13020335.

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Fabrication of porous materials from the standard sacrificial template method allows metal oxide nanostructures to be produced and have several applications in energy, filtration and constructing sensing devices. However, the low surface area of these nanostructures is a significant drawback for most applications. Here, we report the synthesis of ZnO/carbon composite monoliths in which carbon is used as a sacrificial template to produce zinc oxide (ZnO) porous nanostructures with a high specific surface area. The synthesized porous oxides of ZnO with a specific surface area of 78 m2/g are at least one order of magnitude higher than that of the ZnO nanotubes reported in the literature. The crucial point to achieving this remarkable result was the usage of a novel ZnO/carbon template where the carbon template was removed by simple heating in the air. As a high surface area porous nanostructured ZnO, these synthesized materials can be useful in various applications including catalysis, photocatalysis, separation, sensing, solar energy harvest and Zn-ion battery and as supercapacitors for energy storage.

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20

Davi, Martin, Sebastian Peter y Adam Slabon. "Fabrication of hierarchically ordered porous scheelite-related monoclinic BiVO4 nanotubes by electrochemical deposition". Functional Materials Letters 09, n.º 03 (junio de 2016): 1650036. http://dx.doi.org/10.1142/s1793604716500363.

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Scheelite-related monoclinic BiVO4 is one of the most promising metal oxide photoanode materials. It is therefore highly desirable to explore its new nanostructured morphologies in order to achieve higher performance. We present a new method for the fabrication of porous BiVO4 nanotubes. Powder XRD experiments show that the electrodeposited BiVO4 nanotubes crystallize in the scheelite-related monoclinic phase. The produced BiVO4 nanotubes are highly hierarchically ordered and aligned perpendicular to the electrically conductive substrate. The nanostructures were produced by template-assisted electrochemical deposition inside porous anodized alumina oxide. Our method may be extended to other semiconductor materials used in photoelectrochemical systems, such as Bi2WO6 and [Formula: see text]-Bi2MoO6.

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21

Santos, Hélder A. y Jouni Hirvonen. "Nanostructured porous silicon materials: potential candidates for improving drug delivery". Nanomedicine 7, n.º 9 (septiembre de 2012): 1281–84. http://dx.doi.org/10.2217/nnm.12.106.

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22

Piao, Yuanzhe, Hyunchang Lim, Ji Young Chang, Won-Yong Lee y Hasuck Kim. "Nanostructured materials prepared by use of ordered porous alumina membranes". Electrochimica Acta 50, n.º 15 (mayo de 2005): 2997–3013. http://dx.doi.org/10.1016/j.electacta.2004.12.043.

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23

Menzel, Nadine, Erik Ortel, Ralph Kraehnert y Peter Strasser. "Inside Cover: Electrocatalysis Using Porous Nanostructured Materials (ChemPhysChem 6/2012)". ChemPhysChem 13, n.º 6 (16 de abril de 2012): 1366. http://dx.doi.org/10.1002/cphc.201290025.

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24

Boissiere, Cedric, David Grosso, Alexandra Chaumonnot, Lionel Nicole y Clement Sanchez. "Aerosol Route to Functional Nanostructured Inorganic and Hybrid Porous Materials". Advanced Materials 23, n.º 5 (20 de octubre de 2010): 599–623. http://dx.doi.org/10.1002/adma.201001410.

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25

SU, FABING, LU LV y X. S. ZHAO. "SYNTHESIS OF NANOSTRUCTURED POROUS CARBON". International Journal of Nanoscience 04, n.º 02 (abril de 2005): 261–68. http://dx.doi.org/10.1142/s0219581x05003127.

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In this paper, high-surface-area porous carbons with crumpled nanowalls were synthesized by carbonization of sucrose in the presence of zeolite template. The pore structures of the carbon materials were characterized using physical adsorption of nitrogen. Their surface chemistry was analyzed using X-ray photoelectron spectrometer (XPS). The microscopic structure features of the samples were imaged by field-emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM). The nanostructure of synthesized porous carbon with a combination of micro-, meso- and macropores has been obtained.

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26

Yang, Shengchun y Xiao Luo. "Mesoporous nano/micro noble metal particles: synthesis and applications". Nanoscale 6, n.º 9 (2014): 4438–57. http://dx.doi.org/10.1039/c3nr06858g.

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27

Al-AJILI, ADWAN. "CONTINUOUS-WAVE PHOTOLUMINESCENCE AND NANOSTRUCTURAL PROPERTIES OF POROUS SILICON". International Journal of Nanoscience 08, n.º 03 (junio de 2009): 311–18. http://dx.doi.org/10.1142/s0219581x09006079.

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The photoluminescence (PL) emitted by porous silicon has been investigated by using the continuous tuneable UV Synchrotron Radiation Source. One sample was investigated for orange PL emission wavelength at temperatures 77–295 K. The PL peak is found to shift to higher frequency with decreasing temperature. Information about the nanostructure of porous silicon has been determined from PL and Extended X-ray Absorption Fine Structure (EXAFS), as well as from electron microscopy. In particular, the optical properties of silicon-based nanostructured materials, obtained from PL and photoluminescence excitation measurements, have been correlated with structural information from Si –K-edge EXAFS. Electron microscopy was used to study the relation between the nanostructure and PL of porous Si , and to investigate porous Si structure. Platelet Si and Si crystallites in porous Si layers were observed. The size of crystallites ranged from 4 to 6.5 nm. Diffraction patterns show these porous Si samples have a crystalline structure.

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28

Rodríguez-Lorenzo, Luis M., R. García-Carrodeguas, M. A. Rodríguez, S. De Aza, J. Jiménez, A. López-Bravo, M. Fernandez y Julio San Román. "Wollastonite-Poly(Ethylmethacrylate-Co-Vinylpyrrolydone) Nanostructured Materials: Mechanical Properties and Biocompatibility". Key Engineering Materials 309-311 (mayo de 2006): 1149–52. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.1149.

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Synthetic pseudowollastonite (psW) and a nanostructured copolymer made of a biostable component, Poly(ethylmethacrylate) (PEMA) and a bioresorbable component, vinylpyrrolidone (VP) are used in this work for the preparation of a new family of bone substitutes that allow osseointegration and mechanical stability. Composites are prepared by bulk polymerization of the desired composition in 15 mm diameter cylindrical plastic moulds. Polymerization was induced thermally at 50°C using 1wt% azobis(isobutyronitrile) (AIBN) as free-radical initiator. The moulds were filled to a height of 100 mm and 1 mm height discs were cut with a diamond saw. Specimens with a ceramic/polymer ratio 58/42, 33/67,17/83 and 0/100 were obtained. Compression stress in the range 39-59 MPa and elastic modulus between 2.64 and 4.14 GPa are obtained where the greater values correspond to the specimens prepared with a 60% ceramic load. Degradation in SBF produces a porous nanostructure in the polymeric component indicating microdomains of different solubility and the formation of an apatite-like layer on the surface of the wollastonite component. All the compositions assayed present a biocompatibility at least of the level or even superior than the Thermanox® control used.

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29

Riva, Laura, Nadia Pastori, Alice Panozzo, Manuela Antonelli y Carlo Punta. "Nanostructured Cellulose-Based Sorbent Materials for Water Decontamination from Organic Dyes". Nanomaterials 10, n.º 8 (10 de agosto de 2020): 1570. http://dx.doi.org/10.3390/nano10081570.

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Nanostructured materials have been recently proposed in the field of environmental remediation. The use of nanomaterials as building blocks for the design of nano-porous micro-dimensional systems is particularly promising since it can overcome the (eco-)toxicological risks associated with the use of nano-sized technologies. Following this approach, we report here the application of a nanostructured cellulose-based material as sorbent for effective removal of organic dyes from water. It consists of a micro- and nano-porous sponge-like system derived by thermal cross-linking among (2,2,6,6-Tetramethylpiperidin-1-yl)oxyl (TEMPO)-oxidized cellulose nanofibers (TOCNF), branched polyethylenimine 25 kDa (bPEI), and citric acid (CA). The sorbent efficiency was tested for four different organic dyes commonly used for fabric printing (Naphthol Blue Black, Orange II Sodium Salt, Brilliant Blue R, Cibacron Brilliant Yellow), by conducting both thermodynamic and kinetic studies. The material performance was compared with that of an activated carbon, commonly used for this application, in order to highlight the potentialities and limits of this biomass-based new material. The possibility of regeneration and reuse of the sorbent was also investigated.

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30

Srinivasan, R. y K. Ramachandran. "Thermal diffusion in nanostructured porous InP". Bulletin of Materials Science 31, n.º 6 (noviembre de 2008): 863–68. http://dx.doi.org/10.1007/s12034-008-0138-6.

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31

Wang, Meng, Xindong Wang, Ming Chen, Zhaoyi Yang y Chaozhen Dong. "Nanostructured electrocatalytic materials and porous electrodes for direct methanol fuel cells". Chinese Journal of Catalysis 37, n.º 7 (julio de 2016): 1037–48. http://dx.doi.org/10.1016/s1872-2067(16)62477-4.

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32

Zakharchenko, R. V., L. L. Díaz-Flores, J. F. Pérez-Robles, J. González-Hernández y Y. V. Vorobiev. "Nanostructured porous sol-gel materials for applications in solar cells engineering". physica status solidi (c) 2, n.º 9 (junio de 2005): 3308–13. http://dx.doi.org/10.1002/pssc.200461151.

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33

Islam, Mobinul, Ghulam Ali, Min-Gi Jeong, Hyung-Seok Kim, Wonchang Choi, Kyung Yoon Chung y Hun-Gi Jung. "Unveiling the mechanism of sodium ion storage for needle-shaped ZnxCo3−xO4 nanosticks as anode materials". Nanoscale 11, n.º 3 (2019): 1065–73. http://dx.doi.org/10.1039/c8nr08868c.

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Lee, Jinho, Donghwi Cho, Haomin Chen, Young-Seok Shim, Junyong Park y Seokwoo Jeon. "Proximity-field nanopatterning for high-performance chemical and mechanical sensor applications based on 3D nanostructures". Applied Physics Reviews 9, n.º 1 (marzo de 2022): 011322. http://dx.doi.org/10.1063/5.0081197.

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In this era of the Internet of Things, the development of innovative sensors has rapidly accelerated with that of nanotechnology to accommodate various demands for smart applications. The practical use of three-dimensional (3D) nanostructured materials breaks several limitations of conventional sensors, including the large surface-to-volume ratio, precisely tunable pore size and porosity, and efficient signal transduction of 3D geometries. This review provides an in-depth discussion on recent advances in chemical and mechanical sensors based on 3D nanostructures, which are rationally designed and manufactured by advanced 3D nanofabrication techniques that consider structural factors (e.g., porosity, periodicity, and connectivity). In particular, we focus on a proximity-field nanopatterning technique that specializes in the production of periodic porous 3D nanostructures that satisfy the structural properties universally required to improve the performance of various sensor systems. State-of-the-art demonstrations of high-performance sensor devices such as supersensitive gas sensors and wearable strain sensors realized through designed 3D nanostructures are summarized. Finally, challenges and outlooks related to nanostructures and nanofabrication for the practical application of 3D nanostructure-based sensor systems are proposed.

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35

Perko, Sebastjan, Ales Dakskobler y Tomaz Kosmac. "High-Performance Porous Nanostructured Ceramics". Journal of the American Ceramic Society 93, n.º 9 (12 de abril de 2010): 2499–502. http://dx.doi.org/10.1111/j.1551-2916.2010.03835.x.

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Kryazhev, Yury G., Irina V. Anikeeva, Mikhail V. Trenikhin, Tatiana I. Gulyaeva, Valeriy P. Melnikov, Vladimir A. Likholobov y Olga B. Belskaya. "Porous Carbon–Carbon Composite Materials Obtained by Alkaline Dehydrochlorination of Polyvinyl Chloride". Materials 15, n.º 21 (30 de octubre de 2022): 7636. http://dx.doi.org/10.3390/ma15217636.

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Porous carbon–carbon composite materials (PCCCM) were synthesized by the alkaline dehydrochlorination of polyvinyl chloride solutions in dimethyl sulfoxide containing the modifying additives of a nanostructured component (NC): graphite oxide (GO), reduced graphite oxide (RGO) or nanoglobular carbon (NGC), with subsequent two-step thermal treatment of the obtained polyvinylene–NC composites (carbonization at 400 °C and carbon dioxide activation at 900 °C). The focus of the study was on the analysis and digital processing of transmission electron microscopy images to study local areas of carbon composite materials, as well as to determine the distances between graphene layers. TEM and low-temperature nitrogen adsorption studies revealed that the structure of the synthesized PCCCM can be considered as a porous carbon matrix in which either carbon nanoglobules (in the case of NGC) or carbon particles with the “crumpled sheet” morphology (in the case of GO or RGO used as the modifying additives) are distributed. Depending on the features of the introduced 5–7 wt.% nanostructured component, the fraction of mesopores was shown to vary from 11% to 46%, and SBET—from 791 to 1115 m2 g−1. The synthesis of PCCNC using graphite oxide and reduced graphite oxide as the modifying additives can be considered as a method for synthesizing a porous carbon material with the hierarchical structure containing both the micro- and meso/macropores. Such materials are widely applied and can serve as adsorbents, catalyst supports, elements of power storage systems, etc.

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37

Arzhakova, Olga V., Andrei I. Nazarov, Arina R. Solovei, Alla A. Dolgova, Aleksandr Yu Kopnov, Denis K. Chaplygin, Polina M. Tyubaeva y Alena Yu Yarysheva. "Mesoporous Membrane Materials Based on Ultra-High-Molecular-Weight Polyethylene: From Synthesis to Applied Aspects". Membranes 11, n.º 11 (28 de octubre de 2021): 834. http://dx.doi.org/10.3390/membranes11110834.

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The development of new porous polymeric materials with nanoscale pore dimensions and controlled morphology presents a challenging problem of modern materials and membrane science, which should be based on scientifically justified approaches with the emphasis on ecological issues. This work offers a facile and sustainable strategy allowing preparation of porous nanostructured materials based on ultra-high-molecular-weight polyethylene (UHMWPE) via the mechanism of environmental intercrystallite crazing and their detailed characterization by diverse physicochemical methods, including SEM, TEM, AFM, liquid and gas permeability, DSC, etc. The resultant porous UHMWPE materials are characterized by high porosity (up to ~45%), pore interconnectivity, nanoscale pore dimensions (below 10 nm), high water vapor permeability [1700 g/(m2 × day)] and high gas permeability (the Gurley number ~300 s), selectivity, and good mechanical properties. The applied benefits of the advanced UHMWPE mesoporous materials as efficient membranes, breathable, waterproof, and insulating materials, light-weight materials with reduced density, gas capture and storage systems, porous substrates and scaffolds are discussed.

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38

Böttger-Hiller, Falko, Patrick Kempe, Gisela Baumann, Michael Hietschold, Philipp Schäfer, Dietrich R. T. Zahn, Albrecht Petzold, Thomas Thurn-Albrecht y Stefan Spange. "The Controlled Synthesis of Carbon Tubes and Rods by Template-Assisted Twin Polymerization". Advances in Materials Science and Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/872019.

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The application of porous carbon is versatile. It is used for high-performance catalyst support, electrode material in batteries, and gas storage. In each of these application fields nanostructuring improves the material properties. Supercapacitors store a high energy density. Exactly adapted carbon structures increase the life of lithium batteries and protect catalysts with increasing reaction rate and selectivity. Most of porous carbon materials have a spherical shape. To the best of our knowledge, there is no procedure to synthesize nanostructured cylindrical porous carbon systematically. Here, template glass fibres and SiO2-tubes were modified with nanostructured SiO2/phenolic resin and SiO2/poly(furfuryl alcohol) layers by surface twin polymerization (TP) of 2,2′-spirobi[4H-1,3,2-benzodioxasiline] and tetrafurfuryloxysilane. Afterwards the SiO2/polymer layer on the template is thermally transformed into a defect-free nanostructured SiO2/carbon layer. After completely removing the SiO2components microporous carbon tubes or rods are finally achieved. The diameters of the carbon rods and the inner as well as the outer diameter of the carbon tubes are adjustable according to the shape and size of the template. Thus, a huge variety of microporous carbon materials can be easily produced by template-assisted TP.

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39

Kim, Hyoung Seop y Jai Sung Lee. "Strength of Nanostructured Materials Using a Phase Mixture Model". Key Engineering Materials 306-308 (marzo de 2006): 1085–90. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.1085.

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A phase mixture model (PMM) was considered in which materials are treated as a mixture of grain interior phase, grain boundary phase and pores (if the material is porous) for the elasticity and plasticity of nanostructured materials (NSMs). In order to investigate the effects of grain size and porosity on the elastic modulus, a self-consistent method in conjunction with PMM was employed. The calculated results are compared with the experimental measurements in the literature. The elastic modulus of NSMs decreases with a decrease of the grain size and the decrement is relatively large at grain sizes below about 10 nm. The effect of porosity, however, is substantially greater than the grain size effect. For the plasticity of NSMs, grain size effects were introduced both via the dislocation glide mechanism and through the diffusion mechanisms providing mass transfer via grain boundaries. A good agreement between the calculated deformation behavior and experiment was found. The quality of the above predictions with regard to strength, strain hardening, strain sensitivity and ductility behavior testify the adequacy of the model. It is concluded that the model can be used as a convenient tool for simulating the deformation behavior of NSMs.

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40

Chen, Xuewen. "Preparation of Au-Ag Bimetals and Large-Size Porous Gold Nanostructured Materials". Advances in Materials Science and Engineering 2021 (13 de diciembre de 2021): 1–9. http://dx.doi.org/10.1155/2021/4160735.

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Gold, silver, and other precious metals are very important nonferrous metals and have been widely applied in fields such as electronics, medicine, metallurgy, pharmaceuticals, and transportation. Adjustable properties of precious metals are mainly attributed to controlled synthesis of precious metals by structure, size, composition, and morphology. Synthesis of binary metals focuses on coordination of physical and chemical properties of metal elements in components, with the aim to give full play to the advantages of the two metals. Gold (Au) and silver (Ag) have similar lattice constants, which provide important theoretical basis for obtaining the binary bimetallic nanostructure of the two metals by coreduction at room temperature. Ag–Au alloy was prepared at different molar ratios of Ag+/AuIII, and the bimetallic nanomaterials obtained had similar Ag/Au ratios to the molar ratio at reaction. This suggested that the bimetallic nanomaterials reacted completely, with the maximum average size in Ag90.1–Au9.9 and the minimum average size in Ag83.2–Au16.8 and Ag66.9–Au33.1. Due to the deficiency of conventional etching agents, the “regrowth etching” method was proposed in this study. Specifically, with AuI as the etching agent, the porous gold nanomaterials with the size of more than 300 nm were successfully prepared, achieving the regrowth etching effect and a good structural stability. According to the analysis based on the catalytic reduction reaction with p-nitrophenol, the properties of the large-size porous gold nanomaterials were related to the quantity and size of pores.

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41

Zaharov, Yuriy A., Valeriy M. Pugachev, Kseniya A. Datiy, Anna N. Popova, Anastasiya S. Valnyukova, Artem S. Bogomyakov y Vadim G. Dodonov. "Nanostructured Polymetallic Powders to Create New Functional Materials on its Base". Key Engineering Materials 670 (octubre de 2015): 49–54. http://dx.doi.org/10.4028/www.scientific.net/kem.670.49.

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In the paper, the particle morphology is considered and the slices of phase diagrams of nanosystems agreeable to the synthesis conditions are constructed according to the data obtained earlier by authors, as well as new results of the study of nanostructured Fe-Co, Fe-Ni, Co-Ni, Fe-Co-Ni, Fe-Pt, Cu-Ni and Ni-Cd powders. It is found that all considered polymetallic systems have common nature of the particle size spatial organization, i.e., 7-20 nm nanocrystals (for different systems) form highly compact aggregates (40-100 nm) which put together into loose porous agglomerates (up to 200-250 nm) and then into unconsolidated micron size formation of cloud type. It is classified uncovered features of nanostructured polymetallic phase diagrams in comparison with phase diagrams of bulk systems. Magnetic properties of nanosystems are studied.

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42

Macchi, Giorgio, Francesco Meinardi, Patrizia Valsesia y Riccardo Tubino. "Versatile Bottom-Up Approach to Nanostructured Functional Materials for Optoelectronic Applications". International Journal of Photoenergy 2008 (2008): 1–4. http://dx.doi.org/10.1155/2008/784691.

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A versatile strategy to load ordered mesoporous silica-based materials with functional molecular building blocks in order to obtain host-guest systems exhibiting specific functions is described. Optical microscope examination of the obtained material confirms that the addition of a chromophoric moiety to the reaction mixture is not detrimental in achieving the desired macroscopic morphology of the silica particles. A micro-photoluminescence investigation of the obtained material gave strong evidence that both surfactant micelles and the porous oxide matrix preserve the spectral features of the included molecular species in a nonconventional chemical environment.

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43

Montini, Daniele, Claudio Cara, Massimiliano D’Arienzo, Barbara Di Credico, Silvia Mostoni, Roberto Nisticò, Luca Pala y Roberto Scotti. "Recent Advances on Porous Siliceous Materials Derived from Waste". Materials 16, n.º 16 (11 de agosto de 2023): 5578. http://dx.doi.org/10.3390/ma16165578.

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In recent years, significant efforts have been made in view of a transition from a linear to a circular economy, where the value of products, materials, resources, and waste is maintained as long as possible in the economy. The re-utilization of industrial and agricultural waste into value-added products, such as nanostructured siliceous materials, has become a challenging topic as an effective strategy in waste management and a sustainable model aimed to limit the use of landfill, conserve natural resources, and reduce the use of harmful substances. In light of these considerations, nanoporous silica has attracted attention in various applications owing to the tunable pore dimensions, high specific surface areas, tailorable structure, and facile post-functionalization. In this review, recent progress on the synthesis of siliceous materials from different types of waste is presented, analyzing the factors influencing the size and morphology of the final product, alongside different synthetic methods used to impart specific porosity. Applications in the fields of wastewater/gas treatment and catalysis are discussed, focusing on process feasibility in large-scale productions.

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44

Lin, Jhih-Fong, Melinda Mohl, Mikko Nelo, Geza Toth, Ákos Kukovecz, Zoltán Kónya, Srividya Sridhar et al. "Facile synthesis of nanostructured carbon materials over RANEY® nickel catalyst films printed on Al2O3 and SiO2 substrates". Journal of Materials Chemistry C 3, n.º 8 (2015): 1823–29. http://dx.doi.org/10.1039/c4tc02442g.

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Films of porous RANEY® Ni catalyst particles deposited on substrates by stencil printing offer a facile platform for synthesizing nanostructured carbon/nickel composites for direct use as electrodes in electrochemical and field emitter devices.

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45

Lozhkomoev, A. S. y S. O. Kazantsev. "Estimation of the influence of porous nanostructured materials on blood chemistry values". IOP Conference Series: Materials Science and Engineering 447 (21 de noviembre de 2018): 012072. http://dx.doi.org/10.1088/1757-899x/447/1/012072.

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46

Irfan, Muhammad, Feray Ünlü, Khan Lê, Thomas Fischer, Hameed Ullah y Sanjay Mathur. "Electrospun Networks of ZnO-SnO2 Composite Nanowires as Electron Transport Materials for Perovskite Solar Cells". Journal of Nanomaterials 2022 (2 de agosto de 2022): 1–13. http://dx.doi.org/10.1155/2022/6043406.

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Here, we report on the fabrication of one-dimensional (1D) zinc oxide-tin oxide (ZnO-SnO2, ZTO) hollow nanostructures by coaxial electrospinning followed by investigations of their electron transport properties in regular perovskite solar cells (PSCs). The as-electrospun nanowires (NWs) were obtained as core-shell nanostructures comprised of polymeric core and metal oxide precursors-polymer shell. Thermal analysis studies of the as-electrospun NWs revealed the optimum calcination temperature for complete removal of the polymer and formation of phase pure ZTO. The obtained nanostructured ZTO materials revealed a porous morphology with tubular nanostructures, i.e., NTs. The porous structure of nanoparticles, i.e., NTs in this case, is of particular interest due to the following reasons: (a) structure, particularly 1D, has a profound influence on the electron transport properties, and (b) suitable porosity helps in effective infiltration of perovskite material and hence supports better charge transport at the ZTO-perovskite interface. The nanomaterials were characterized by Fourier transform infrared (FTIR), diffuse reflectance spectroscopy (DRS), and energy dispersive X-ray spectroscopy (EDX) to confirm the presence/absence of functional groups, establish band gap energies ( E g ), and determine the elemental compositions, respectively. The ZTO NTs were used as electron transport media in the fabrication of perovskite solar cells (PSCs) and established the structure-property (electron transport) relationships. The highest solar to power conversion efficiency (PCE) of 13.0% (average: 11.90%) was measured for the PSCs based on ZTO NTs obtained by calcination of as-electrospun NWs at 800°C. It indicates the fact that the calcination temperature influenced the structure which as a result influenced the electron transport property of the material used as ETL in PSCs.

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47

Lo Presti, M., R. Ragni, D. Vona, G. Leone, S. Cicco y G. M. Farinola. "In vivo doped biosilica from living Thalassiosira weissflogii diatoms with a triethoxysilyl functionalized red emitting fluorophore". MRS Advances 3, n.º 27 (2018): 1509–17. http://dx.doi.org/10.1557/adv.2018.60.

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ABSTRACTDiatoms microalgae represent a natural source of highly porous biosilica shells (frustules) with promising applications in a wide range of technological fields. Functionalization of diatoms’ frustules with tailored luminescent molecules can be envisaged as a convenient, scalable biotechnological route to new light emitting silica nanostructured materials. Here we report a straightforward protocol for the in vivo modification of Thalassiosira weissflogii diatoms’ frustules with a red emitting organic dye based on thienyl, benzothiadiazolyl and phenyl units. The metabolic insertion of the dye molecules into the diatoms shells, combined with an acidic-oxidative isolation protocol of the resulting dye stained biosilica, represents a novel strategy to develop highly porous luminescent biosilica nanostructures with promising applications in photonics.

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48

Welser, Roger E., Adam W. Sood, Jaehee Cho, E. Fred Schubert, Jennifer L. Harvey, Nibir K. Dhar y Ashok K. Sood. "Nanostructured Transparent Conductive Oxides for Photovoltaic Applications". MRS Proceedings 1493 (2013): 23–28. http://dx.doi.org/10.1557/opl.2013.30.

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ABSTRACTOblique-angle deposition is used to fabricate indium tin oxide (ITO) optical coatings with a porous, columnar nanostructure. Nanostructured ITO layers with a reduced refractive index are then incorporated into antireflection coating (ARC) structures with a step-graded refractive index design, enabling increased transmittance into an underlying semiconductor over a wide range of wavelengths of interest for photovoltaic applications. Low-refractive index nanostructured ITO coatings can also be combined with metal films to form an omnidirectional reflector (ODR) structure capable of achieving high internal reflectivity over a broad spectrum of wavelengths and a wide range of angles. Such conductive high-performance ODR structures on the back surface of a thin-film solar cell can potentially increase both the current and voltage output by scattering unabsorbed and emitted photons back into the active region of the device.

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49

Fu, Xiuli, Guijun Ban, Dan Li, Hanyuan Chen y Zhijian Peng. "Synthesis and Characterization of One-Dimensional Porous (Zn,Cd)S/SiO2Composite Nanostructural Materials". Advances in Condensed Matter Physics 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/758572.

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One-dimensional (1D) porous (Zn,Cd)S/SiO2composite nanostructural materials were synthesized by thermal evaporation of ZnS and CdS mixture powder at 950°C. The nanomaterials were collected from silicon wafers which were coated with 10 nm thick gold and were set apart from the source about 10 cm away. The diameter of the as-prepared 1D porous composite nanostructures is in the range of 1–1.5 μm and their lengths are up to tens to hundreds of micrometers. The photoluminescence spectra measured at different temperatures of the prepared nanostructures display a similar broadband signature, which can be fitted by Gaussian function into three emission peaks centered at 477, 536, and 588 nm and attributed to band edge emission, neutral oxygen vacancies, and antisymmetric stretching of Si–O–Si and nonstoichiometric SiOx(1<x<2), respectively.

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50

Taurbayev, Y. T., K. A. Gonchar, A. V. Zoteev, Victor Timoshenko, Z. Zh Zhanabayev, V. E. Nikulin y T. I. Taurbayev. "Electrochemical Nanostructuring of Semiconductors by Capillary-Cell Method". Key Engineering Materials 442 (junio de 2010): 1–6. http://dx.doi.org/10.4028/www.scientific.net/kem.442.1.

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Wafers of silicon and compound semiconductors are nanostructured by using electrochemical or chemical etching (stain etching) in etching cell with electrolyte kept by capillary forces. Atomic force microscopy, infrared spectroscopy and Raman scattering methods reveale nanoporous and nanocrystalline structure of the treated surfaces. The formed porous semiconductors demonstrate efficient photoluminescence, which is controlled by etching parameters, i.e. current density, electrolyte content, etc. These results indicate good prospects of the employed capillary-cell method for preparing nanostructured porous materials with desired structure and optical properties.

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