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Literatura académica sobre el tema "Coreshell structures"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Coreshell structures"

Tsai, Yu Sheng, Xin Dai Lin, Wei Lun Chan, Shang Che Tsai, Wei Jen Liao, Yew Chung Sermon Wu y Hsiang Chen. "Morphological, Material, and Optical Properties of ZnO/ZnS/CNTs Nanocomposites on SiO2 Substrate". Nanomaterials 10, n.º 8 (4 de agosto de 2020): 1521. http://dx.doi.org/10.3390/nano10081521.

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Ultraviolet A light (UV-A, 320–400 nm), which is unblockable by sunscreen, requires careful detection for disease avoidance. In this study, we propose a novel photosensing device capable of detecting UV-A. Cancer-causing UV light can be simultaneously monitored with tiny rapid response sensors for a high carrier transition speed. In our research, a multifunctional ZnO/ZnS nanomaterial hybrid-sprinkled carbon nanotube (CNT) was created for the purpose of fabricating a multipurpose, semiconductorbased application. For our research, ZnO nanorods (NRs) were grown by using a facile hydrothermal method on SiO2 substrate, then vulcanized to form ZnO/ZnS coreshell nanorods, which were sprinkled with carbon nanotubes (CNTs). Results indicate that SiO2/ZnO/ZnS/CNT structures exhibited a stronger conducting current with and without light than those samples without CNTs. Multiple material characterizations of the nanostructures, including of atomic force microscopy (AFM) surface morphology evaluation, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) indicate that CNTs could be successfully spread on top of the ZnO/ZnS coreshell structures. Furthermore, chemical binding properties, material crystallinity, and optical properties were examined by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and photoluminescence (PL). Owing to their compact size, simple fabrication, and low cost, ZnO/ZnS coreshell NRs/CNT/SiO2-based nanocomposites are promising for future industrial optoelectronic applications.

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Mahmed, Norsuria, Oleg Heczko y Simo Pekka Hannula. "Influence of Hydrochloric Acid Concentrations on the Formation of AgCl-Doped Iron Oxide-Silica Coreshell Structures". Advances in Science and Technology 77 (septiembre de 2012): 184–89. http://dx.doi.org/10.4028/www.scientific.net/ast.77.184.

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Silver chloride (AgCl) nanoparticles with the average size of about 45 nm have successfully been doped onto the iron oxide-silica coreshell surfaces by a simple room temperature wet chemistry method under ambient atmosphere. The Stöber process has been used to make the coreshell structure, followed by adsorption of Ag+ species on silica surface prior to the addition of hydrochloric acid (HCl) and polyvinylpyrrolidone (PVP). The concentration of HCl acid that was used to induce the growth of AgCl particles was varied from 0.12 mM to 12x103 mM of concentrations. Results showed that at a very high concentration of HCl (12x103 mM), large AgCl agglomerates (0.3-0.6 microns) with irregular cubic-like morphology were obtained while at a very low, 12 mM HCl concentration, 30-50nm AgCl particles having a uniform cubic morphology were observed. Concentrations below 12 mM result in irregular and nearly spherical morphology of AgCl particles with a smaller size (28-60 nm). UV-Vis absorption of the composite materials showed absorption in the visible wavelength indicating that Ag nanoclusters might coexist together with AgCl particles.

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Husni, Hazreen Nadihah, Norsuria Mahmed, Yanling Ge, Mohd Natashah Norizan, Dewi Suriyani Che Halin, Kamrosni Ab Razak y Ili Salwani Mohamad. "Magnetic-Based Coreshell Nanoparticles as Potential Adsorbents for the Removal of Cu²⁺ Under Ultraviolet (UV) Light". Journal of Physics: Conference Series 2080, n.º 1 (1 de noviembre de 2021): 012032. http://dx.doi.org/10.1088/1742-6596/2080/1/012032.

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Abstract The magnetite (Fe3O4) and maghemite (γFe2O3) nanopartides, magnetite-silica-silver chloride (Fe3O4-SiO2-AgCl) and maghemite-silica-silver chloride (γFe2O3-SiO2-AgCl) coreshell structures have successfully been synthesized by using a simple wet chemistry method. The efficiency of these particles as the adsorbents for the removal of copper ion, Cu2+ in aqueous solution under UV light was investigated. Two different parameters were studied, namely the adsorbents contact time (60, 120, 180, 240 and 300s) and the solution-stirring rate (100, 200 and 300 rpm). From the results, the removal percentage of the copper ions from the solution were above 90% after 5 hours of adsorption process at 300 rpm by using Fe3O4 (94%) and γFe2O3 (92%) nanoparticles. The maximum removal of copper ions was nearly 100% when yFe2O3-SiO2-AgCl & Fe3O4-SiO2-AgCl coreshell particles were used. The samples that were prepared without magnetic core such as AgCl-SiO2, AgCl and SiO2 particles, showed lower percentage of the copper ions removal (78%, 60% and 20%, respectively). This situation shows that the magnetic nanoparticles plays and important role during the adsorption process due to their large active sites for the adsorption to occur.

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Hu, Shukai. "Mxenes applications in different metal ion batteries". Applied and Computational Engineering 3, n.º 1 (25 de mayo de 2023): 336–40. http://dx.doi.org/10.54254/2755-2721/3/20230537.

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Mxenes, with unique two-dimensional structures, possess excellent electrical conductivity and low diffusion barriers, which are potential materials used in different metal ion batteries. Herein this paper focuses on synthesising MXenes applications through a literature review method. In relevant analysis, Mxenes can be Constructed in Ultrathin Layered with TiN in Heterostructure to Facilitate the Favorable Catalytic Capability of LithiumSulfur Batteries. For Potassium-Ion Batteries, MXene coated in Carbon to form a Three-Dimensional MXene/Iron Selenide Ball with CoreShell Structure shows a high reversible capacity with significant cycle stability. Ti3C2Tx MXene Electrolyte Additive prevents zinc ion batteries from Zinc Dendrite Deposition. Lastly, customizing the MXene nitrogen terminals for Na-Ion Batteries facilitates fast charging and stable cycling even when the temperature is low.

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Wu, Zhao Yang, Guang Qiang Li, Xi'an Fan, Yu Meng Xu, Zhan Zhang y Xiang Liang Wan. "Microstructure and Properties of Fe-6.5wt%Si Alloys Cores with Core-Shell Structures Prepared by Mechanical Alloying and Spark Plasma Sintering Methods". Advanced Materials Research 881-883 (enero de 2014): 980–85. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.980.

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In this work, the Fe-6.5wt%Si alloy cores with core-shell structures were prepared by Mechanical Alloying and Spark Plasma Sintering methods. The microstructure and magnetic properties of the samples were investigated with differential scanning calorimetry, X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. The results show that the synthesis of the Fe-6.5wt%Si powder with core-shell structures can be completion during mechanical alloying process. And the coreshell structure, Fe-6.5wt%Si as core and SiO2as shell, apparently exists in the sinter cores. The relative densities of sintered cores would ascend with increasing the sintering temperature. The Ms offered upgrade tendency with increasing the sintering temperature, while the Hc curves evolve with almost opposite phases. For the core sintered at 1050 °C, the following magnetic data were observed: Ms = 167.84 emu/g, Mr = 2.26 emu/g, Hc = 11.77 Oe, ρ = 2 μΩm and P15/400 = 2.47 W/kg.

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Saleh, Hoda H., Rehab Sokary y Zakaria I. Ali. "Radiation – induced preparation of polyaniline/poly vinyl alcohol nanocomposites and their properties". Radiochimica Acta 107, n.º 8 (26 de julio de 2019): 725–35. http://dx.doi.org/10.1515/ract-2018-3003.

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Abstract Polyaniline (PANI) nanoparticles and PANI/poly vinyl alcohol (PVA) nanocomposite films were synthesized by the oxidative polymerization of aniline and ammonium peroxodisulfate (APS), as an oxidizing agent in aqueous medium. The PANI/PVA nanocomposite films were exposed to γ-irradiation after oxidative polymerization. Synthesized polyaniline (PANI) nanoparticles and PANI/PVA nanocomposite films were characterized by attenuated total reflectance infrared spectroscopy (FTIR-ATR), X-ray diffraction, high resolution scanning electron microscopy, (HRSEM) high resolution transmission electron microscopy, (HRTEM) and UV-VIS absorption spectroscopy. Energy band gap of PANI nanofibers was determined from Tauc’s plots which equal 4.2 eV. Scanning electron microscopy images show that chemically synthesized of polyaniline has nanofibers structure and irradiated PANI/PVA nanocomposite have a mixture of nanorod and nanosphere structures. The transmission electron microscopy show that chemically synthesized of polyaniline has average length in the range 34 ± 10 nm with less wide distribution, where as the irradiated PANI/PVA nanocomposite has coreshell structure.

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Jiang, Hai Hui, Yan Zhou, Xiao Yun Han, Xin Cheng Chen, Yun Hua Hou y Li Gang Gai. "Core-Shell Structured Fe₃O₄/PPy Microspheres with High Magnetization for Purification of Plasmid DNA". Advanced Materials Research 716 (julio de 2013): 314–19. http://dx.doi.org/10.4028/www.scientific.net/amr.716.314.

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Amino group-functionalized magnetic particles have wide applications in enzyme immobilization, DNA extraction, drug delivery, water purification, catalysis, and sensor. In this paper, Fe3O4/PPy microspheres with a well-defined coreshell structure have been prepared through an interfacial polymerization approach without surfactant. The magnetic composite spheres were characterized with XRD, FTIR, SEM, TEM, and magnetometry techniques, and further tested as the adsorbent to isolate plasmid DNA from Escherichia coli (E. coli) DH5α cells. The magnetic separation yields high-quality plasmid DNA in satisfying productivity as compared to the conventional phenolchloroform extraction.

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Vichitchote, Koravee, Poonsub Threepopnatkul, Supakij Suttiruengwong y Chanin Kulsetthanchalee. "In Vitro Drug Release Activity from Core/Shell Electrospun MATS of sPLA-cPEG/GS and sPLA/CA-cPEG/GS". Materials Science Forum 714 (marzo de 2012): 263–70. http://dx.doi.org/10.4028/www.scientific.net/msf.714.263.

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In this research, the core-shell structured fiber was fabricated by coaxial electrospinning technique. A set of biodegradable polymers namely polylactic acid (PLA) and cellulose acetate (CA) were used as the shell material. Gentamicin sulfate (GS) as antimicrobial drug with polyethylene glycol (PEG) was used as the core structure. PEG formed the core section of the coreshell fibers for GS encapsulation.In-vitrodrug release activity of the core-shell fibers was determined by total immersion method in pH 7.4 phosphate buffer solutions (PBS). It was found that core-shell fibers sPLA-cPEG/GS exhibit higher initial release compared to that of core-shell fibers sPLA/CA-cPEG/GS.

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Haurat, Margaux y Michel Dumon. "Amorphous Polymers’ Foaming and Blends with Organic Foaming-Aid Structured Additives in Supercritical CO2, a Way to Fabricate Porous Polymers from Macro to Nano Porosities in Batch or Continuous Processes". Molecules 25, n.º 22 (14 de noviembre de 2020): 5320. http://dx.doi.org/10.3390/molecules25225320.

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Organic polymers can be made porous via continuous or discontinuous expansion processes in scCO2. The resulting foams properties are controlled by the interplay of three groups of parameters: (i) Chemical, (ii) physico-chemical, and (iii) technological/process that are explained in this paper. The advantages and drawbacks of continuous (extrusion, injection foaming) or discontinuous (batch foaming) foaming processes in scCO2, will be discussed in this article; especially for micro or nano cellular polymers. Indeed, a challenge is to reduce both specific mass (e.g., ρ < 100 kg·m−3) and cell size (e.g., average pore diameter ϕaveragepores < 100 nm). Then a particular system where small “objects” (coreshells CS, block copolymer MAM) are perfectly dispersed at a micrometric to nanometric scale in poly(methyl methacrylate) (PMMA) will be presented. Such “additives”, considered as foaming aids, are aimed at “regulating” the foaming and lowering the pore size and/or density of PMMA based foams. Differences between these additives will be shown. Finally, in a PMMA/20 wt% MAM blend, via a quasi one-step batch foaming, a “porous to nonporous” transition is observed in thick samples. A lower limit of pore size (around 50 nm) seems to arise.

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Bao, Yuping, Hector Calderon y Kannan M. Krishnan. "Controlled Synthesis and Characterization of Co-Au Core-shell Nanoparticles". MRS Proceedings 877 (2005). http://dx.doi.org/10.1557/proc-877-s3.4.

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AbstractCo-Au Core-shell nanoparticles are synthesized by slowly reducing an organo-gold compound on pre-made cobalt seeds with a weak reducer at mild condition. For the first time, these coreshell nanoparticles are generated in non-polar solvent in a controlled manner. The formation theory of core-shell structure, especially the seed size effect, is addressed as well. These coreshell structures are confirmed with a wide range of transmission electron microscopy (TEM) methods, which includes routine TEM images, high resolution TEM, and z-contrast imaging.

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Tesis sobre el tema "Coreshell structures"

Pishchagin, Anton. "Diameter engineering in III-V nanowire heterostructures - Experiments and modelling". Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS516.

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Les nanofils (NWs) semi-conducteurs III-V présentent des propriétés physiques intéressantes pour diverses applications. Le potentiel de tels dispositifs ne se concrétisera pleinement que si on parvient à contrôler précisément ces propriétés. Cette étude porte sur les NWs auto-catalysés de GaAs et GaP fabriqués par épitaxie par jet moléculaire sur un substrat de Si, en mode vapeur-liquide-solide. Nous étudions expérimentalement et théoriquement des questions relatives au contrôle précis du diamètre d'un NW, notamment sa modification déterministe durant la croissance. Nous étudions la dynamique de la consommation d'une goutte apicale de Ga exposée à un flux de phosphore. Nous établissons les mécanismes qui contribuent à la diminution du volume de la goutte et calculons les courants de matière correspondants. Implémentation de ce modèle nous permet de moduler localement le diamètre des NWs de manière contrôlée. Nous parvenons ainsi à former un segment de NW plus fin ou plus épais, d'un diamètre stable, au sommet d'un pied du même matériau. La seconde partie du travail est dédiée aux NWs cœur-coquille à base de matériaux de paramètres de maille différents. Nous calculons les limites géométriques du rayon de cœur et d'épaisseur de coquille, au-delà desquelles la formation d'une première dislocation interfaciale est énergétiquement favorable. Nous fabriquons de tels NWs dans une large gamme de dimensions de cœur et de coquille et déterminons si des dislocations se forment ou pas. La comparaison de nos déterminations des dimensions critiques pour la relaxation plastique montre qu'il est possible de faire croître des coquilles sans défaut plus épaisses que prédit par la théorie
III-V semiconductor nanowires are highly promising building blocks for various applications. However, the full potential of nanowire-based devices will only be realized if the nanowire physical properties can be precisely tailored. This study concentrates on self-catalyzed GaAs and GaP nanowires grown on a Si substrate by molecular beam epitaxy, in the Vapor-Liquid-Solid mode. We address experimental and theoretical issues related to the precise control of the diameter of a nanowire, in particular its deterministic modification during growth. We first study the dynamics of the consumption of a Ga apical catalyst droplet under exposure to a phosphorous flux. Combining experiments and modelling, we establish the mechanisms that contribute to the decrease of the droplet volume and calculate analytically the corresponding material currents. Implementing this model allows us to modulate locally the nanowire diameter in a controllable fashion. We thus manage to form a thinner or a thicker nanowire segment with a stable diameter on top of a stem of the same material. The second part of our work is devoted to core-shell nanowires involving lattice-mismatched materials. We compute the geometrical limits for core radius and shell thickness, above which the formation of a first interfacial dislocation is energetically favorable We then grow GaAs/GaP core/shell nanowires in a wide range of core radii and shell thicknesses and determine for each geometry if dislocations form or not. The comparison of our theoretical and experimental determinations of the critical dimensions for plastic relaxation shows the possibility to grow much thicker defect-free shells than predicted by theory

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Actas de conferencias sobre el tema "Coreshell structures"

Pu, Ye, Rachel Grange, Chia-Lung Hsieh y Demetri Psaltis. "Ultrasensitive second harmonic generation nanoprobes via plasmonic coreshell structures". En 11th European Quantum Electronics Conference (CLEO/EQEC). IEEE, 2009. http://dx.doi.org/10.1109/cleoe-eqec.2009.5191508.

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Park, Y. H. y I. Hijazi. "Properties of Bimetallic Core-Shell Nanoclusters". En ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78242.

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Gold (Au) and copper (Cu) materials and their combination exhibit the most of the main wanted properties in nanostructures. Nobel metals such as Au and Cu have important magnetic, electronic, optical, catalytic and thermal properties. Compared to monometallic clusters, bimetallic nanoclusters have more degrees of freedom and distinct properties due to the presence of two different metals. It is also well known that the shape, surface topography, segregation, mixing, ordering, energetic stability, and electronic structures of bimetallic nanoclusters may depend significantly on their composition. This affords greater opportunity to control their properties by modifying composition as well as size. In this work, we investigated magnetic and electronic properties for AuCu bimetallic core-shell structures and showed that the CuAu coreshell can have a half-metal property through chemical composition modification. Half-metallic ferromagnets attract increasing research interest as potential materials for spintronic device applications.

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Psuja, P., L. Marciniak, D. Hreniak y W. Strek. "Fabrication and optical properties of selected coreshell structures with nanocrystalline rare-earth doped phosphors coated with SiO2 submicron particles". En 2007 International Students and Young Scientists Workshop on "Photonics and Microsystems". IEEE, 2007. http://dx.doi.org/10.1109/stysw.2007.4559122.

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Petrov, Alexander Yu, Guoliang Shang, Lukas Maiwald y Manfred Eich. "High-contrast structural color based on photonic glass from coreshell particles". En CLEO: Applications and Technology. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/cleo_at.2020.jw2d.27.

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