Relevant bibliographies by topics / Oxide matrices

Academic literature on the topic 'Oxide matrices'

Author: Grafiati
Published: 7 July 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Journal articles on the topic "Oxide matrices":

1

Azeem, Muhammad, and Muhammad Azhar Saleem. "A Raman Spectroscopic Study of Calcium Silicate Hydrate (CSH) in the Cement Matrix with CNTs and Oxide Additives." Journal of Spectroscopy 2022 (April 26, 2022): 1–6. http://dx.doi.org/10.1155/2022/2281477.

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The calcium silicate hydrate (CSH) concentration in the cement paste mixed with different types of carbon nanotubes (CNTs) and oxide additives is compared by using Raman spectroscopy. The pristine, hydroxyl and carboxyl functionalized CNTs are used in this work. The oxide additives are zinc oxide (ZnO), gadolinium oxide (Gd2O3), and silicon oxide (SiO2). A laser wavelength of 785 nm was used to collect the Raman spectra. It was observed that the concentration of calcium silicate hydrate (CSH) is unaffected in CNTs-OPC matrices regardless of the type and weight percentage of the CNTs. The oxides, as expected, show significant effects on the concentration of the CSH in the matrices. An increase in the CSH concentration is observed in the ZnO and Gd2O3 matrices with cement. For the SiO2 cement paste matrix, however, the CSH concentration appears to be decreased. This study shows CSH concentration can be controlled by using oxide additives whereas CNTs do not react chemically with the cement composites.
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Azeem, Muhammad, and Muhammad Azhar Saleem. "A Raman Spectroscopic Study of Calcium Silicate Hydrate (CSH) in the Cement Matrix with CNTs and Oxide Additives." Journal of Spectroscopy 2022 (April 26, 2022): 1–6. http://dx.doi.org/10.1155/2022/2281477.

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The calcium silicate hydrate (CSH) concentration in the cement paste mixed with different types of carbon nanotubes (CNTs) and oxide additives is compared by using Raman spectroscopy. The pristine, hydroxyl and carboxyl functionalized CNTs are used in this work. The oxide additives are zinc oxide (ZnO), gadolinium oxide (Gd2O3), and silicon oxide (SiO2). A laser wavelength of 785 nm was used to collect the Raman spectra. It was observed that the concentration of calcium silicate hydrate (CSH) is unaffected in CNTs-OPC matrices regardless of the type and weight percentage of the CNTs. The oxides, as expected, show significant effects on the concentration of the CSH in the matrices. An increase in the CSH concentration is observed in the ZnO and Gd2O3 matrices with cement. For the SiO2 cement paste matrix, however, the CSH concentration appears to be decreased. This study shows CSH concentration can be controlled by using oxide additives whereas CNTs do not react chemically with the cement composites.
3

Egorin, Andrei, Eduard Tokar, Anna Matskevich, Nikita Ivanov, Ivan Tkachenko, Tatiana Sokolnitskaya, and Larisa Zemskova. "Composite Magnetic Sorbents Based on Iron Oxides in Different Polymer Matrices: Comparison and Application for Removal of Strontium." Biomimetics 5, no. 2 (May 18, 2020): 22. http://dx.doi.org/10.3390/biomimetics5020022.

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Introduction of magnetic nanoparticles into composite sorbents based on polymer matrices has received great attention due to the possibility of using cheap iron oxides and removing spent sorbents by means of magnetic separation. In the present paper, we discuss the problem of creating magnetic sorbents using two types of matrices as host materials: synthetic cation exchange resin and natural aminopolysaccharide chitosan. The possibilities of applying matrices for the in situ formation of oxide phases of a specified composition with the required content of an inorganic component in a composite material were estimated. The composition of the oxide phase formed in the composite material was studied, and particle sizes were evaluated by the method of X-ray diffraction analysis. Magnetic characteristics were investigated. Sorption characteristics with respect to strontium for the composites containing iron oxides were determined.
4

Frolova, Elena, Tobias Otto, Nikolai Gaponik, and Vladimir Lesnyak. "Incorporation of CdTe Nanocrystals into Metal Oxide Matrices Towards Inorganic Nanocomposite Materials." Zeitschrift für Physikalische Chemie 232, no. 9-11 (August 28, 2018): 1335–52. http://dx.doi.org/10.1515/zpch-2018-1139.

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Abstract In this work we present a technique of incorporation of semiconductor CdTe nanocrystals (NCs) into metal oxide matrices prepared by inorganic sol-gel method. As the matrices, we chose alumina and aluminum tin oxide, which are optically transparent in the visible region. Among them the first is electrically insulating, while the second is conductive and thus can be used in optoelectronic devices. We found optimal synthetic parameters allowing us to maintain optical properties of the NCs in both matrices even after heating up to 150°C in air. Therefore, in our approach we overcame a common problem of degradation of the optical properties of semiconductor NCs in oxide matrices as a result of the incorporation and subsequent interaction with the matrix. The resulting materials were characterized in detail from the point of view of their optical and structural properties. Based on the results obtained, we suggest the formation mechanism of these materials. Semiconductor NCs embedded in robust and optically transparent metal oxides offer promising applications in optical switching, optical filtering, waveguides, light emitting diodes, and solar concentrators.
5

Silva, Nuno João O., Angel Millan, Vitor S. Amaral, Fernando Palacio, Lianshe Fu, Luís D. Carlos, and V. de Zea Bermudez. "Iron Oxide and Oxide-Hydroxide Nanoparticles in Organic-Inorganic Matrices." Materials Science Forum 514-516 (May 2006): 142–46. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.142.

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Nanometric ferrihydrite, maghemite and magnetite particles formed within an organicinorganic hybrid matrix were obtained by the sol-gel process. In contrast to precipitation techniques, sol-gel process appears as suitable way to achieve size-controlled nanoscopic magnetic particles anchored in a hybrid structure. The hybrid matrix here reported, named di-ureasil, is composed of poly(oxyethylene) chains grafted to siloxane groups by means of urea cross-linkages. The formation of ferrihydrite particles was achieved incorporating iron nitrate during the sol-gel process, at low pH. The formation of maghemite takes place after the incorporation of a mixture of Fe3+ and Fe2+ ions and treatment with an ammonia solution, after the sol-gel process. Magnetite nanoparticles are formed after the incorporation of Fe2+ ions and treatment with ammonia at 80°C. The AC magnetic susceptibility shows thermal irreversibility with a blocking temperature TB≈13K and ≈25K depending on frequency for the ferrihydrite and maghemite particles, respectively. The magnetite nanoparticles are blocked at room temperature. Above the irreversibility the magnetization of ferrihydrite and maghemite follows a Langevin function modified with a linear term, as found in antiferromagnetic and ferrimagnetic particles.
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Hubicki, Rafał, Maria Richert, and Piotr Łebkowski. "Influence of Operating Temperature on the Service Life of Aluminum Extrusion Dies." Materials 15, no. 19 (September 26, 2022): 6656. http://dx.doi.org/10.3390/ma15196656.

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The article investigates the effect of temperature and annealing time on the surface quality of WNLV nitrided steel used for the production of dies for extrusion of aluminum alloys. Eight annealing variants were tested, differing in the total annealing time at temperatures of 460 °C and 590 °C. The results show the effect of the annealing time on the width of the diffusion layer, which increased with the increasing length of the annealing time. The hardness decreased as the annealing time increased. It was found that annealing of the steel causes its oxidation. The oxide layer formed consisted of two layers, more specifically, an Fe2O3 oxide layer and a lower Fe3O4 oxide layer adhering to the steel surface. The surface of sections pressed on oxidized matrices was tested. The roughness of the surface of the oxide layers was also tested. The research revealed that an increase in the surface roughness of the oxides deposited on the matrices causes an increase in the roughness of the extruded sections. These results can potentially be used to improve the efficiency of the extrusion process and the quality of the extruded sections.
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Terencio, Tercio Bezerra Correia, Valter Bavastrello, and Claudio Nicolini. "Calcium Oxide Matrices and Carbon Dioxide Sensors." Sensors 12, no. 5 (May 8, 2012): 5896–905. http://dx.doi.org/10.3390/s120505896.

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Estrada, C., J. A. Gonzalez, A. Kunold, J. A. Reyes-Esqueda, and P. Pereyra. "Photoluminescence of nanocrystals embedded in oxide matrices." physica status solidi (c) 4, no. 2 (February 2007): 248–52. http://dx.doi.org/10.1002/pssc.200673264.

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Larichev, Timothy, Natalia Fedorova, Yuri Zakharov, Valerii Pugachev, Tatiana Sergina, and Liudmila Khitsova. "Catalytic thermo-oxidation of carbon matrix in the nanocomposite electrode material for supercapacitors preparation process." E3S Web of Conferences 460 (2023): 10041. http://dx.doi.org/10.1051/e3sconf/202346010041.

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The study of thermal oxidation in air of carbon matrix in the presence of nanosized particles of filler - cobalt oxide Co3O4, as well as mixed oxides NiCo2O4 and ZnxCo1-xOy was carried out. The particles of transition metal oxides were created by thermal decomposition of precursor compounds (azides and hydroxides). It is shown that vigorous oxidation in the air of the porous carbon matrix starts after the formation of Co3O4 at temperatures above 300 ° C. The intensity of oxidation is directly proportional to the filler concentration in the carbon-transition metal oxide composite system. Carbon matrices based on multilayer carbon tubes show higher resistance to oxidation processes.
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Ros Madi, Nur Alia Farhana, Nurfatehah Wahyuny Che Jusoh, Yuki Nagao, Lian See Tan, and Mariam Firdhaus Mad Nordin. "Utilizing metal oxide/fabric composites for photocatalytic degradation of wastewater." E3S Web of Conferences 516 (2024): 03004. http://dx.doi.org/10.1051/e3sconf/202451603004.

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The growing concern over water pollution has increased the search for innovative and sustainable approaches to wastewater treatment. This manuscript offers a concise exploration of the utilization of composite materials comprising metal oxides and fabrics for the purpose of photocatalytic degradation. Metal oxides, including titanium dioxide (TiO2), zinc oxide (ZnO), and etc possess inherent photocatalytic properties that, when combined with fabric matrices, present a synergistic approach for pollutant removal. The incorporation of metal oxides and fabrics enhances the photocatalytic performance through the improvement of the catalyst properties. This review covers the photocatalytic mechanisms and properties of metal oxide fabric composites as well as the applications of these composites in environmental remediation and wastewater treatment. As a promising avenue for sustainable pollutant mitigation, further research in this field holds the key to unlocking the full potential of metal oxide fabric composites in diverse environmental applications.
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Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Oxide matrices":

1

Frazier, Laura M. "Superabsorbent Nanofiber Matrices." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1164646276.

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Leite, Rubim Rafael. "Graphene oxide sheets confined within anisotropic fluid matrices." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0209/document.

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Dès sa découverte, le graphène oxydé (GO), le plus accessible des précurseurs du graphène, a été largement utilisé pour des applications en science et technologie. La motivation de ce travail est d'étudier, d'un point de vue fondamental, le couplage entre des bicouches amphiphiles auto-associées (lesquelles peuvent être vues comme une matrice anisotrope formée d'objets bidimensionnels) et un objet lui-même bidimensionnel, en l'occurrence le feuillet de graphène oxydé, quand ils sont dispersés dans un solvant commun. La compétition entre les élasticités intrinsèques des bicouches et des feuillets de GO, ainsi que les interactions directes bicouche-bicouche, bicouche-GO et GO-GO, permet d'envisager un riche polymorphisme en fonction de la composition du système. Après avoir développé une procédure destinée à contrôler, dans une gamme étendue de teneur en GO, le système binaire GO-eau, le domaine confiné des dispersions aqueuses de GO a été exploré et, par la suite, le diagramme de phases ternaire a été construit. Les systèmes obtenus ont été caractérisés par des techniques comme la microscopie optique et la diffusion du rayonnement (diffusion dynamique de la lumière et diffusion des rayons-X aux petits angles). Les propriétés élastiques et thermodynamiques ont été décrites par l'application de modèles initialement conçus pour les phases lamellaires à deux constituants et adaptés dans le cadre de cette étude
Since the discovery of graphene oxide (GO), the most accessible of the precursors of graphene, this material has been widely studied for applications in science and technology. The motivation of this work is to study with a fundamental perspective the coupling between amphiphilic bilayers, which can be seen as an anisotropic matrix formed of two-dimensional objects, and another two-dimensional object, namely the graphene oxide sheet when they are dispersed in a common solvent. The competition between the intrinsic elasticities of the bilayers and GO sheets, as well as between direct bilayer-bilayer, bilayer-GO and GO-GO interactions allows us to envisage a rich polymorphism, depending on the composition of the system. Following the development of a dedicated procedure for controlling in an extended range of GO content the binary GO-water system, the confined domain of aqueous GO dispersions was first investigated, and the ternary phase diagram then constructed. The obtained systems have been characterised, using techniques such as optical microscopy, light and x-ray scattering. Elastic and thermodynamic properties have been described by applying, and adapting to the scope of this study, models for two-component lamellar stacks
Desde sua descoberta, o grafeno oxidado (GO), o mais acessível dos precursores do grafeno,tem sido amplamente utilizado para aplicações na ciéncia e tecnologia. A motivação destetrabalho é de estudar, de um ponto de vista fundamental, o acoplamento entre bicamadas anfifílicas auto-organizadas (que podem ser vistas como uma matriz anisotrópica formada por objetos bidimensionais) e um objeto ele mesmo bidimensional, neste caso a folha de óxido de grafeno, quando estão dispersados em um solvente comum.A competição entre as elasticidades intrínsecas das bicamas e das folhas de GO, assimcomo as interaçãoes diretas bicamada-bicamada, bicamada-GO e GO-GO, permitem esperar um rico polimorfismo em função da composição do sistema. Seguindo o desenvolvimento de um procedimento destinado ao controle, em um intervalo extendido da quantidade de GO, o sistema binário GO-água, o domínio confinado de dispersões aquosas de GO foi explorado e, em seguida, o diagrama de fases ternário contruído.Os sistemas obtidos foram caracterizados por t_ecnicas como microscopia ótica, espalhamento dinâmico de luz e espalhamento de raios-x à baixos ângulos. As propriedadeselásticas e termodinâmicas foram descritas pela aplicação de modelos inicialmente concebidos para fases lamelares à dois constituintes e adaptados ao escopo deste estudo
3

Silva, Nuno João de Oliveira. "Structural and magnetic studies on iron oxide nanoparticles in hybrid matrices." Doctoral thesis, Universidade de Aveiro, 2006. http://hdl.handle.net/10773/8944.

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Doutoramento em Física
Este trabalho aborda algumas propriedades magnéticas e estruturais de nanopartículas de óxidos e óxidos-hidróxidos de ferro crescidos em matrizes híbridas orgânicas-inorgânicas. As matrizes híbridas, denominadas di-ureasils e obtidas pelo processo sol-gel, são compostas por uma rede siliciosa ligada covalentemente por pontes ureia a cadeias orgânicas de diferente peso molecular. A estrutura local dos di-ureasils não dopados está modelada como grupos de domínios siliciosos com dimensões nanométricas, estruturalmente correlacionados no seio de uma matriz rica em polímero. Neste trabalho mostra-se que os di-ureasils permitem o crescimento controlado de óxidos e óxidos-hidróxidos de ferro, incluindo a magnetite, maguemite, oxihidroxinitrato de ferro e ferrihidrite. O crescimento das nanopartículas de ferrihidrite dá-se em condições ácidas à superfície dos domínios siliciosos, junto aos grupos carbonilo, que funcionam como pontos de nucleação. Desse modo dá-se uma nucleação heterogénea, onde o tamanho das nanopartículas depende da concentração de ferro (entre 1 e 6% em massa), sendo a concentração de partículas constante. As propriedades magnéticas das nanopartículas de ferrihidrite revelam a existência de interacções antiferromagnéticas e de momentos descompensados. A contribuição destas duas componentes nas curvas de magnetização em função do campo magnético pode ser separada usando um método aqui proposto, o que permite um adequado estudo da evolução do momento magnético com a temperatura. O estudo das propriedades magnéticas dinâmicas das partículas de ferrihidrite, através de susceptibilidade ac, medidas de relaxação e medidas de efeito Mossbauer, permitiu estudar a evolução das interacções dipolares em função da concentração de ferro, bem como determinar a distribuição de barreiras de energia de anisotropia no caso em que essas interacções são desprezáveis. É apresentado um novo método para comparação desta distribuição com a distribuição de tamanhos, que permitiu concluir que os momentos magnéticos descompensados estão aleatoriamente distribuídos em volume. Usando baixas concentrações de água, foi possível crescer fases de oxihidroxinitrato de ferro com diferentes graus de cristalinidade, sendo algumas precursoras da ferrihidrite (como observado noutros trabalhos) e sendo outras novas fases. O crescimento de nanopartículas de maguemite e magnetite acontece após incorporação de iões de Fe2+ e Fe3+ seguidos de tratamento básico e térmico. Estes sistemas apresentam propriedades magnéticas típicas de nanopartículas superparamagnéticas sem interacções dipolares. As propriedades magnéticas dependem criticamente da existência de grupos isocianato livres, que actuarão como pontos de nucleação.
The present work focus on the structure and the magnetic properties of iron oxide and iron oxide hydroxide nanoparticles grown in organic-inorganic hybrids. The sol-gel derived matrix, termed di-ureasils, is a siliceous network to which oligopolyoxyethilene chains with different molecular weight are grafted by means of urea cross-links. The di-ureasils local structure was modelled as groups of nanometric siloxane correlated domains embedded in a polymericrich media. In this thesis, the controlled growth of ferrihydrite, iron(III) oxyhydroxynitrate phases, maghemite and magnetite in di-ureasils is demonstrated. Ferrihydrite nanoparticles are formed at low pH on the siliceous surface, where the carbonyl groups act as nucleation points. This implies an heterogeneous nucleation, where the nanoparticles size depend on the amount of iron (in the 1 to 6% wt range) and the nanoparticles concentration is constant. The ferrihydrite nanoparticles have antiferromagnetic and uncompensated/canted moments, responsible for linear and saturation components in the dependence of the magnetization with field, respectively. These components can be separated by a new method here presented and an accurate dependence of the magnetic moment with temperature determined. The dynamic magnetic properties of ferrihydrite were studied by ac susceptibility, relaxation and Mossbauer measurements. These studies allowed the determination of the evolution of the dipolar interactions with the iron content and the determination of the anisotropy energy barrier distribution in cases where such interactions are negligible. Comparing the energy barrier distribution with the size distribution allowed to conclude that the uncompensated moments are randomly distributed in volume. This conclusion is based on a new method here presented, that uses distributions to investigate the power law relation between physical quantities. Antiferromagnetic iron(III) oxyhydroxynitrate phases with different degrees of crystallinity are formed when using low water concentrations in the sol-gel process. Some of these are precursors of ferrihydrite, as previously found in literature, but others constitute new phases. Maghemite and magnetite nanoparticles can be grown inside diureasils after the incorporation of Fe2+ and Fe3+ ions, followed by basic and thermal treatment. The magnetic properties show the existence of noninteracting superparamagnetic nanoparticles. Evidence for the possibility of tuning the magnetic properties of the system by allowing the existence of free isocyanate groups acting as nucleation sites was found.
4

Bowes, Sarah-Jane. "The study of Si-O bonds in low temperature matrices and in the gas phase." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342658.

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Rodríguez, Martínez Yerila. "Plasmonic Cu nanoparticles inclusion in ZnO and Cu2O matrices for enhanced photoconversion of all-oxide optoelectronics." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0208.

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Dans ce travail, nous présentons dans une première partie les résultats de la croissance in situ de nanoparticules (NPs) plasmoniques de cuivre (Cu) dans une matrice de p-Cu2O en utilisant la pulvérisation cathodique magnétron réactive d'une cible de Cu et en ajustant le débit d'oxygène. Il a été possible d'observer, dans des conditions pauvres en oxygène, la formation de films composites CuNPs-Cu2O présentant la signature du phénomène de résonance plasmon de surface localisée (LSPR). Les dispositifs basés sur les nanocomposites étudiés interfacés avec de l'oxyde de zinc (ZnO) ont été caractérisés par des mesures J-V et des mesures spectrales de photocourant, montrant une augmentation de la densité de photocourant sous illumination optique comme conséquence de l'incorporation des particules plasmoniques et de l'injection conséquente de porteurs chauds. La deuxième partie du manuscrit présente les résultats du recuit thermique rapide (RTA) des films composites CuNPs-Cu2O dans des conditions pauvres en oxygène et l'évolution de leurs propriétés lorsque la température augmente. Après un recuit à une température de recuit supérieure à 150 ºC, il a été possible de constater une ségrégation du cuivre vers la surface, une augmentation de l'orientation cristalline préférentielle du Cu2O et une amélioration du signal LSPR. La réponse électrique des dispositifs constitués des composites interfacés avec ZnO puis recuits à 200 ºC a montré une augmentation supplémentaire du photocourant en raison de la LSPR des nanoparticules de Cu à la surface des dispositifs. Enfin, la synthèse de nanoparticules de Cu par une source d'agrégation de gaz (GAS) et la fabrication ultérieure de structures multicouches ZnO-CuNPs avec une réponse plasmonique ont été étudiées. Le composite obtenu a révélé une réponse LSPR et la présence de particules de Cu agissant comme points de nucléation pour des grains coniques de ZnO hautement orientés
In this work we present the results on in-situ growth of plasmonic copper (Cu) nanoparticles (NPs) into a p-Cu2O matrix by using reactive magnetron sputtering of a Cu target and adjusting the oxygen flowrate. It was possible to observe, for oxygen-poor conditions, the formation of CuNPs-Cu2O composites presenting the signature of the localized surface plasmon resonance (LSPR) phenomenon. Devices based on the studied nanocomposites interfaced with zinc oxide (ZnO) were characterized by J-V and spectral photocurrent measurements, showing a photocurrent density increase under optical illumination as a result of the plasmonic particles incorporation and consequent hot carriers injection. In the second part of the manuscript, the results about the rapid thermal annealing (RTA) of the CuNPs-Cu2O composites under oxygen-poor conditions and their properties evolution when temperature increases are presented. At temperature higher than 150 ºC it was possible to see a copper segregation towards the surface, increase in the crystal preferential orientation of Cu2O and improvement of the LSPR signal. Electrical response of devices constituted by the composite layers interfaced with ZnO and annealed at 200 ºC showed a further increase in the photocurrent resulting from the LSPR of Cu NPs at the devices surface. Finally, the synthesis of Cu nanoparticles through a gas aggregation source (GAS) and the subsequent fabrication of ZnO-CuNPs multilayer structure with plasmonic response were studied. The resulted composite revealed LSPR response and the presence of Cu particles acting as nucleation points for highly oriented ZnO conical grains
6

Xuankun, Li. "Effect of Surfactants on the Behaviors and Transport of Metal Oxide Nanomaterials in Aqueous Matrices and Porous Media." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225578.

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Thumma, Sridhar. "Characterization of water insoluble and water soluble drugs in hot-melt poly (ethylene oxide) matrices for oral transmucosal delivery /." Full text available from ProQuest UM Digital Dissertations, 2008. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1850456491&SrchMode=1&sid=3&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1279304005&clientId=22256.

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Thesis (Ph.D.)--University of Mississippi, 2008.
Typescript. Vita. "March 2008." Major professor: Dr. Michael Repka Includes bibliographical references (leaves 306-326). Also available online via ProQuest to authorized users.
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Sim, Seok-Hoon. "Modifications of polyimides and polyimide-inorganic oxide hybrids with perfluoroether oligomers for use as matrices for carbon-fibre composites." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/35624.

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The performance of a polyimide derived from a low molecular weight polyamic acid (Skybond 703) and the corresponding polyimide-silica hybrids, used as matrices for Carbon-fibre composites, was evaluated. The study involved the incorporation of telechelically modified perfluoroether oligomers into the resin systems. Telechelic modifications of the hydroxyl-terminated perfluoroether oligomer were carried out in order to achieve the required compatibility with the polyimide phase through grafting reactions with the polyamic acid precursor. In the case of hybrids, the compatibility requirements were extended also to the prehydrolysed alkoxysilane solution added to the polyamic acid mixtures. The latter was achieved with the incorporation of a silane coupling agent (γ-glycidyloxypropyltrimethoxysilane), which resulted in the formation of nano-scale silica domains in the polyimide.
9

Vallerini, Barbosa Itália. "Nanocristaux oxydes luminescents pour le développement de nanosondes de température in vivo." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI125.

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Les changements thermiques biologiques sont des événements courants lors d'activités métaboliques cellulaires anormales. En effet, les aberrations thermiques – telles qu'une augmentation de la température locale des tissus – sont directement liées à la détection de zones enflammées, à la présence de tumeurs ou d'autres maladies. En plus de contribuer au diagnostic des maladies, la détermination de la température locale dans les systèmes biologiques peut également aider à leur traitement. Par exemple, dans l'hyperthermie, une élévation de température doit être induite dans les tissus tumoraux à des niveaux cytotoxiques afin de détruire les cellules cancéreuses et de fournir un traitement contre le cancer. Cependant, la montée en température doit être réalisée de manière contrôlée et bien localisée sur les cellules cibles cancéreuses, tout en évitant un échauffement des tissus sains environnants. De plus, pour déterminer de telles maladies, les variations de température doivent être déterminées avec précision. Des études antérieures en nanothermométrie luminescente montrent qu’il n’y a encore de sondes thermiques adéquates pour les environnements biologiques. Il est donc nécessaire de développer des nanothermomètres luminescents avec une morphologie et une taille adéquate, fonctionnant avec des longueurs d'onde d'excitation et d'émission dans le domaine de transparence des tissus. Pour répondre à cette demande, nous avons mené une étude de différents nanocristaux d'oxydes dopés avec des ions lanthanides afin de développer des nanothermomètres luminescents capables de déterminer la température dans des systèmes in vivo à haute résolution thermique. Les performances thermométriques ont été déterminées en calculant la sensibilité thermique relative (S_r) à l'aide de l'approche d'intensité de luminescence ratiométrique. Par ailleurs, notre étude a permis de soulever quelques hypothèses pouvant contribuer efficacement aux performances thermométriques. Nous avons mis en jeu la technique du rapport d’intensité de deux pics de luminescence pour laquelle les valeurs de S_r peuvent être optimisées en co-dopant les nanocristaux avec deux, ou plusieurs, ions Ln3+ et en utilisant des matrices oxydes présentant différentes énergies de phonons. Ainsi, du fait de sa nature générique et de sa souplesse de synthèse, la méthode Pechini a été choisie pour synthétiser plusieurs matrices oxydes, Y2O3, Y2Ge2O7, Y3Al5O12 (YAG), Y3BO6 et YBO3. Les nanocristaux ont tout d’abord été mono-dopés avec Nd3+, puis co-dopés avec Nd3+ -Yb3+ pour améliorer les propriétés de sonde thermiques dans les fenêtres biologiques du proche IR. De plus, nous avons optimisé les concentrations de dopage dans les matrices hôtes pour une plus grande efficacité dans la détection de la luminescence dans les organismes biologiques. Nous avons observé expérimentalement que les valeurs de Sr sont fortement impactées sur l'énergie des phonons de la matrice. Nous avons observé que par co-dopage Nd3+-Yb3+ les performances thermométriques des nanocristaux sont améliorées par rapport aux nanocristaux mono dopés Nd3+. Notre étude de ce différent oxyde a montré que le YAG et Y2O3 sont des matrices les plus prometteuses, pour l'application de la nanothermométrie luminescente in vivo. Enfin, des nanocristaux individuels (non agglomérés comme dans le cas des synthèses Péchini) de YAG de taille 60 nm et de morphologie contrôlée ont été obtenus en solution par la méthode solvothermale pour faire avancer les études dans les futures applications biologiques. Nous avons observé que les nanothermomètres YAG adaptés à cet objectif ont un Sr égal à 0,47 %·K-1 et une résolution thermique de 0,3 K. Des tests expérimentaux in vivo seront bien sûr nécessaires pour valider les résultats de cette étude; cependant, nos résultats obtenus sur les performances des nanocristaux YAG:Nd3+-Yb3+ démontrent dès à présent un fort potentiel pour des applications in vivo de nanothermométrie luminescente ratiométrique
Biological thermal modifications are common events during abnormal cellular metabolic activities. Indeed, thermal aberrations – such as an increase in local tissue temperature – are directly related to the detection of inflamed areas, the presence of tumors, or other diseases. In addition to contributing to the diagnosis of diseases, the determination of local temperature in biological systems can also help with their treatment. For instance, in hyperthermia, the increase in temperature must be induced in tumor tissues up to cytotoxic levels in order to kill cancer cells and therefore, it assists in the cancer treatment. However, the increase in temperature must be carried out in a controlled and well-localized manner to target cancer cells, while avoiding overheating of surrounding healthy tissue. Furthermore, to determine such biological aberrations, temperature variations must be accurately determined. The thermometric performance of the nanothermometers was determined by calculating the relative thermal sensitivity (S_r) using the ratiometric luminescence intensity approach. Furthermore, our study made it possible to raise some hypotheses that can effectively contribute to the thermometric performance of thermal probes. We use the technique of the intensity ratio of two luminescence peaks for which the values of S_r can be optimized by co-doping the nanocrystals with two, or more, Ln3+ ions and by using oxide matrices presenting different phonon energies. Thus, due to its generic nature and synthesis flexibility, the Pechini method was chosen to synthesize several oxide matrices, Y2O3, Y2Ge2O7, Y3Al5O12 (YAG), Y3BO6 and YBO3. The nanocrystals were firstly monodoped with Nd3+ and posteriorly, codoped with Nd3+ -Yb3+ to improve the thermal probe properties within the biological windows of near infrared. In addition, we optimized the doping concentrations in the host matrices for greater efficiency in luminescence detection in biological organisms. We experimentally observed that Sr values are strongly impacted to the phonon energy of the matrix. We analyzed that by Nd3+ -Yb3+ codoping the thermometric performance of nanocrystals is improved compared to nanocrystals mono doped with Nd3+. Our study of different oxides shows that the YAG and Y2O3 matrices are the most promising matrices for the luminescence nanothermometry in vivo application. Lastly, YAG individual nanocrystals (non-agglomerated as in the case of Pechini syntheses) of size 60 nm and controlled morphology were obtained in solution by the solvothermal method to advance in further studies in biological applications. We observed that the YAG nanothermometers suitable for the purpose have a S_r equal to 0.47 %·K-1 and a thermal resolution of 0.3 K. In vivo experimental tests are required to validate the findings of this study; however, our results obtained on the performance of YAG: Nd3+ -Yb3+ nanocrystals has been showing high potential for in vivo applications of ratiometric luminescence nanothermometry
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Molloy, James. "Argon and argon-chlorine plasma reactive ion etching and surface modification of transparent conductive tin oxide thin films for high resolution flat panel display electrode matrices." Thesis, University of Ulster, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243741.

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Books on the topic "Oxide matrices":

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Molloy, James. Argon and argon-chlorine plasma reactive ion etching and surface modification of transparent conductive tin oxide thin films for high resolution flat panel display electrode matrices. [s.l: The Author], 1997.

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Kreuzer, Paul Erich. Kinetik der Permeation von gasförmigem und in verschiedenen Matrizes gelöstem Ethylenoxid durch die Haut von Ratte, Meerschweinchen und Mensch. Neuherberg: GSF-Forschungszentrum für Umwelt und Gesundheit, 1992.

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Vakhrushev, Alexander V., Rishat G. Valeev, Aleksey Yu Fedotov, and Dmitrii I. Petukhov. Nanostructured Semiconductors in Porous Alumina Matrices. Taylor & Francis Group, 2019.

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Vakhrushev, Alexander V., Rishat G. Valeev, Aleksey Yu Fedotov, and Dmitrii I. Petukhov. Nanostructured Semiconductors in Porous Alumina Matrices. Taylor & Francis Group, 2021.

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Vakhrushev, Alexander V., Rishat G. Valeev, Aleksey Yu Fedotov, and Dmitrii I. Petukhov. Nanostructured Semiconductors in Porous Alumina Matrices: Modeling, Synthesis, and Properties. Apple Academic Press, Incorporated, 2019.

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Vrinceanu, Narcisa, Emanuela Ciolan, and Paraschiva Postolache. Novel Approach of Added-Value Zinc Oxide Powders for Polymeric Fibrous Matrices with Engineered Architectures for High Performance Textiles. Nova Science Publishers, Incorporated, 2015.

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Book chapters on the topic "Oxide matrices":

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Valeev, Rishat G., Alexander V. Vakhrushev, Aleksey Yu Fedotov, and Dmitrii I. Petukhov. "Porous Anodic Aluminum Oxide: Structure, Properties, and Application in Semiconductor Technology." In Nanostructured Semiconductors in Porous Alumina Matrices, 19–36. Includes bibliographical references and index.: Apple Academic Press, 2019. http://dx.doi.org/10.1201/9780429398148-2.

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Martin, Lawrence M., and Ali R. Rajabi-Siahboomi. "Applications of Polyethylene Oxide (POLYOX) in Hydrophilic Matrices." In Hydrophilic Matrix Tablets for Oral Controlled Release, 123–41. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4939-1519-4_5.

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Valeev, Rishat G., Alexander V. Vakhrushev, Aleksey Yu Fedotov, and Dmitrii I. Petukhov. "Results of Modeling the Deposition Processes of Nanofilms onto Aluminum Oxide Templates." In Nanostructured Semiconductors in Porous Alumina Matrices, 205–45. Includes bibliographical references and index.: Apple Academic Press, 2019. http://dx.doi.org/10.1201/9780429398148-10.

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Funahashi, Yoshihiro, Toru Shimamori, Toshio Suzuki, Yoshinobu Fujishiro, and Masanobu Awano. "Microstructure Control of Cathode Matrices for the Cube-Type SOFC Bundles." In Advances in Solid Oxide Fuel Cells III, 195–202. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470339534.ch19.

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Mileiko, S. T. "Novel Oxide Fibers to Reinforce Ceramic and Metal Matrices." In Ceramic Transactions Series, 27–38. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119407270.ch4.

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Valeev, Rishat G., Alexander V. Vakhrushev, Aleksey Yu Fedotov, and Dmitrii I. Petukhov. "Theoretical Models for Investigating The Processes of Nanofilm Deposition onto Porous Templates of Aluminum Oxide." In Nanostructured Semiconductors in Porous Alumina Matrices, 85–140. Includes bibliographical references and index.: Apple Academic Press, 2019. http://dx.doi.org/10.1201/9780429398148-6.

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Mileiko, S. T. "Novel Oxide Fibres to Reinforce Metal, Intermetallic and Ceramic Matrices." In Advanced Multilayered and Fibre-Reinforced Composites, 333–52. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-007-0868-6_22.

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Lambert, J. F., and M. Che. "Towards a better understanding and terminology of the Oxide / Transition Metal Complex interactions." In Catalysis by Unique Metal Ion Structures in Solid Matrices, 1–19. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0782-5_1.

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Corrias, Anna, and Maria Francesca Casula. "Aerogels Containing Metal, Alloy, and Oxide Nanoparticles Embedded into Dielectric Matrices." In Aerogels Handbook, 335–63. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-7589-8_16.

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Corrias, Anna, Danilo Loche, and Maria Francesca Casula. "Aerogels Containing Metal, Alloy, and Oxide Nanoparticles Embedded into Dielectric Matrices." In Springer Handbook of Aerogels, 809–33. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-27322-4_31.

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Conference papers on the topic "Oxide matrices":

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SHEVCHENKO, G. P., Z. M. AFANAS`EVA, V. V. SVIRIDOV, and M. V. BAYKOV. "PREPARATION OF ULTRAFINE PbCrO4 PARTICLES IN OXIDE MATRICES." In Reviews and Short Notes to Nanomeeting '97. WORLD SCIENTIFIC, 1997. http://dx.doi.org/10.1142/9789814503938_0059.

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Zhao, Hongxia, and Robert K. Y. Li. "Photo-Degradation Studies of Zinc Oxide Filled Polypropylene Nanocomposites." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-15607.

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Abstract:
With the rapid developments in polymer matrix nanocomposites, there is growing interest in understanding their behaviors under adverse service conditions. A simple literature search will show the tremendous number of publications on montmorillonite (MMT) filled nanocomposites. It is therefore natural to see that the degradation behaviors for MMT filled nanocomposites have also received a number of detailed studies [1–10]. It was observed that by introducing MMT particles into LDPE [5] and PP [6, 7] matrices, the rate of photo-oxidative degradation was much faster than the corresponding unfilled matrixes. Furthermore, the dispersion state of the MMT particles did not seem to have influence on the photo-degradation rate [5].
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Omelchenko, M. M., M. R. Panasyuk, and V. B. Kapustianyk. "Photoluminescence of ZnO nanocrystals at Cetylpyridinium Chloride and Disodium Cromoglycate matrices." In 2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2012. http://dx.doi.org/10.1109/omee.2012.6464899.

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Calvo, Mauricio, Laura Caliò, Andrea Rubino, and Hernán Míguez. "Porous metal oxide matrices as templating host of ABX3 perovskite nanocrystals." In 2nd nanoGe International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics. València: Fundació Scito, 2019. http://dx.doi.org/10.29363/nanoge.nipho.2020.047.

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Matei (Brazdis), Roxana Ioana, Maria Grapin, Valentin Raditoiu, Florentina Monica Raduly, Alina Raditoiu, Anda Maria Baroi, Toma Fistos, Irina Fierascu, and Radu Claudiu Fierascu. "Metal–Oxide Photocatalysts with Heterojunctions for Ceftriaxone Removal from Water Matrices." In NeXT-Chem 2023. Basel Switzerland: MDPI, 2023. http://dx.doi.org/10.3390/proceedings2023090019.

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6

Go¨ring, Ju¨rgen, Bernd Kanka, Martin Schmu¨cker, and Hartmut Schneider. "A Potential Oxide/Oxide Ceramic Matrix Composite for Gas Turbine Applications." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38836.

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WHIPOX® (Wound Highly Porous Oxide CMCs) are oxide/oxide composites which are composed of highly porous alumino silicate or alumina matrices and of alumino silicate (Nextel 720, 3M) or alumina (Nextel 610, 3M) fibers. The materials are fabricated by a computer-controlled winding technique, developed at DLR. After eventual forming and joining steps, the green prepegs are pressureless sintered in air at 1300°C. The high temperature behavior of the CMCs is mainly controlled by the thermo-mechanical properties of the oxide fibers. For long-term use (>10,000 h) an application limit for the composite of about 1100°C is expected. It can, however, be improved by external thermal barrier coatings up to a maximum surface temperature of 1300°C. Gas burner tests show that the composites are extremely resistant against thermal fatigue. Therefore it is a material with a high potential for the use under the long-term high temperature conditions of gas turbine engines.
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Shin, Y. C., J. H. Lee, M. J. Kim, S. W. Hong, J. W. Oh, C. S. Kim, B. Kim, J. K. Hyun, Y. J. Kim, and D. W. Han. "Graphene oxide-stimulated myogenic differentiation of C2C12 cells on PLGA/RGD peptide nanofiber matrices." In International Conference on Nano-Bio Sensing, Imaging, and Spectroscopy 2015, edited by Donghyun Kim, Min-Gon Kim, and Seung-Han Park. SPIE, 2015. http://dx.doi.org/10.1117/12.2190696.

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8

Revin, A. A., A. A. Konakov, and D. S. Korolev. "CALCULATION OF ELECTRONIC STATES OF PURE AND DOPED GALLIUM OXIDE NANOCRYSTALS IN DIELECTRIC MATRICES." In Actual problems of physical and functional electronics. Ulyanovsk State Technical University, 2023. http://dx.doi.org/10.61527/appfe-2023.145-146.

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This work is devoted to the theoretical calculation of the electronic states of dimensional quantization of the systems Al2O3: nc-Ga2O3. and SiO2: nc-Ga2O3. The electron levels of the conduction band and the holes of the valence band are calculated. The levels of small donors and acceptors were calculated. The reasons for the shift of the photoluminescence peak are discussed
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Savitsky, Andey I., Dmitry G. Gromov, and Igor V. Mel’nikov. "Localization Tailoring for Surface Plasmons in a Disordered Array of Metal Nanoparticles in Oxide Matrices." In Novel Optical Materials and Applications. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/noma.2017.notu1c.5.

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Muhlbauer, Jorg, Kurt Semmelroth, Peter Kruger, Jurgen Schreiber, Nikolai I. Mukhurov, and Norman Uhlmann. "Evaluation of X-ray imaging properties of structured aluminum oxide matrices filled with different scintillator materials." In 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference (2012 NSS/MIC). IEEE, 2012. http://dx.doi.org/10.1109/nssmic.2012.6551132.

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