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Toward Optimal Design of Piezoelectric Transducers Based on Multifunctional and Smoothly Graded Hybrid Material Systems

Rubio, Wilfredo Montealegre; Silva, Emilio Carlos Nelli; Paulino, Gláucio Hermógenes
Fonte: SAGE PUBLICATIONS LTD Publicador: SAGE PUBLICATIONS LTD
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
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This work explores the design of piezoelectric transducers based on functional material gradation, here named functionally graded piezoelectric transducer (FGPT). Depending on the applications, FGPTs must achieve several goals, which are essentially related to the transducer resonance frequency, vibration modes, and excitation strength at specific resonance frequencies. Several approaches can be used to achieve these goals; however, this work focuses on finding the optimal material gradation of FGPTs by means of topology optimization. Three objective functions are proposed: (i) to obtain the FGPT optimal material gradation for maximizing specified resonance frequencies; (ii) to design piezoelectric resonators, thus, the optimal material gradation is found for achieving desirable eigenvalues and eigenmodes; and (iii) to find the optimal material distribution of FGPTs, which maximizes specified excitation strength. To track the desirable vibration mode, a mode-tracking method utilizing the `modal assurance criterion` is applied. The continuous change of piezoelectric, dielectric, and elastic properties is achieved by using the graded finite element concept. The optimization algorithm is constructed based on sequential linear programming...

Supramolecular Approach to Gold Nanoparticle/Triruthenium Cluster Hybrid Materials and Interfaces

TOMA, Sergio H.; SANTOS, Jonnatan J.; ARAKI, Koiti; TOMA, Henrique E.
Fonte: WILEY-BLACKWELL Publicador: WILEY-BLACKWELL
Tipo: Artigo de Revista Científica
ENG
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A systematic and comprehensive study of the interaction of citrate-stabilized gold nanoparticles with triruthenium cluster complexes of general formula [Ru(3)(CH(3)COO)(6)(L)](+) [L = 4-cyanopyridine (4-CNpy), 4,4`-bipyridine (4,4`-bpy) or 4,4`-bis(pyridyl)ethylene (bpe)] has been carried out. The cluster-nanoparticle interaction in solution and the construction of thin films of the hybrid materials were investigated in detail by electronic and surface plasmon resonance (SPR) spectroscopy, Raman scattering spectroscopy and scanning electron microscopy (SEM). Citrate-stabilized gold nanoparticles readily interacted with [Ru(3)O(CH(3)COO)(6)(L)(3)](+) complexes to generate functionalized nanoparticles that tend to aggregate according to rates and extents that depend on the bond strength defined by the characteristics of the cluster L ligands following the sequence bpe > 4,4`-bpy >> 4-CNpy. The formation of compact thin films of hybrid AuNP/[Ru(3)O(CH(3)COO)(6)(L)(3)](+) derivatives with L = bpe and 4,4`-bpy indicated that the stability/lability of AuNP-cluster bonds as well as their solubility are important parameters that influence the film contruction process. Fluorine-doped tin oxide electrodes modified with thin films of these nanomaterials exhibited similar electrocatalytic activity but much higher sensitivity than a conventional gold electrode in the oxidation of nitrite ion to nitrate depending on the bridging cluster complex...

Novos materiais funcionais organo-híbridos baseados em óxidos metálicos e diimidas aromáticas; New hybrid functional materials based in metal oxides and aromatic diimides

Chagas-Silva, Fatima Aparecida das
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 18/05/2012 PT
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O uso e estudo de materiais híbridos para desenvolver novos materiais com qualidades superiores para aplicações em fotônica, sensores e áreas afins é um desafio para o químico. Neste contexto deve-se especular sobre as propriedades de associação de materiais orgânicos e inorgânicos para alcançar novas e melhores propriedades. Neste estudo, os óxidos metálicos (óxidos de cério em particular), uma classe especial entre nanopartículas inorgânicas, foram selecionados para explorar as suas aplicações com uma classe, também especial de compostos orgânicos, sendo no nosso estudo as Naftaleno Diimidas. Óxido de cério é um semicondutor, com uma “bandgap” larga, conhecido por sua capacidade catalítica e por sua simples manipulação para preparar filmes finos e nanopartículas. Derivados de Naftaleno Diimidas são conhecidos por sua superior atividade eletroquímica comparáveis aos dos Paraquat (metilviologênio), mas com amplitude maior de aplicações fotoquímicas. Foram sintetizadas Naftaleno Diimidas carregados positivamente e negativamente com propriedades surfactantes. Após a caracterização detalhada das Naftaleno Diimidas, incluindo auto-associação e interação com moléculas de surfactantes...

Materiais híbridos baseados em argilas catiônicas e espécies com potencial terapêutico; Hybrid materials based on cationic clays and species with therapeutic potential

Mangoni, Ana Paula
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 12/02/2014 PT
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Os argilominerais são empregados na área farmacêutica e cosmética tanto como excipientes quanto ingredientes ativos. Esses compostos inorgânicos são inertes quimicamente, apresentam estruturas definidas e alta estabilidade térmica, o que contribui para o uso nessas áreas. Atualmente a indústria farmacêutica busca modificações no sistema de entrega de drogas (melhorias no tempo, local e taxa de liberação), objetivando um aumento na estabilidade das drogas e a prevenção e diminuição de efeitos colaterais. Nesse sentido, surge a necessidade de desenvolver novas formulações farmacêuticas, novos métodos de preparação e novos materiais. Considerando o fato dos argilominerais incorporarem espécies diversas entre suas lamelas, é interessante explorar a possibilidade de uso dessas matrizes inorgânicas como carregadores de espécies bioativas. O principal objetivo do presente trabalho foi preparar e caracterizar argilas de uso farmacêutico e/ou cosmético intercaladas com espécies que apresentam potencial terapêutico. Para tanto, usou-se duas argilas esmectitas naturais do tipo montmorilonita (Cloisita Sódica e Veegum HS) e uma esmectita sintética do tipo hectorita (Laponita RD). Os aminoácidos L-lisina, L-arginina e L-ornitina...

Métodos de análise de materiais híbridos: um estudo comparativo entre fluorescência de raios-x com detecção dispersiva em energia usando fonte tradicional e luz síncroton; Hybrid Materials Analysis Methods: A comparative study of X-ray Fluorescence Detection in Energy Dispersive using Traditional Source and Synchrotron Light

Ysnaga, Orlando Armando Elguera
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 10/06/2015 PT
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47.8752%
Os Ormosils pertencem aos sistemas nanoestruturados, apresentando uma grande diversidade de estruturas e permitindo o controle das propriedades dos materiais obtidos. Os Ormosils contribuem ao desenvolvimento de materiais multifuncionais pela sua estrutura flexível (matriz hospedeira), que permite a oclusão de diversas espécies (moleculares, iônicas), a qual pode ser ajustada pela mudança dos grupos funcionais dos silanos precursores. Os filmes dos Ormosils têm potencial aplicação em fitas dosimétricas, janelas inteligentes, selos antifraude, dispositivos fotônicos, filmes fotocatalíticos e dispositivos fotocrômicos. Esta Tese abordou a determinação qualitativa, semiquantitativa e quantitativa dos filmes dos Ormosils (contendo nanopartículas de TiO2, ZnO e Fosfotungstatos ([PW12O40]3)) e aqueles constituídos por uma rede interpenetrante de sílica, sesquisiloxano e hidroxiuretana de poli(dimetilsiloxano) contendo Fosfotungstatos, com potencial aplicação em membranas para células combustíveis e na produção de janelas fotocrômicas. Outro dos materiais analisados constituíram Ormosils ocluídos na matriz de Poli(imidas), com potencial aplicação no armazenamento de Hidrogênio, membranas para células combustíveis e revestimentos isolantes e anticorrosivos.

A quantificação e mapeamento dos elementos fotoativos são relevantes para a melhoria no desenvolvimento destes materiais...

Novel cellulose/NbOPO 4.nH 2O hybrid material from sugarcane bagasse

Pereira, Paulo Henrique Fernandes; Voorwald, Herman Jacobus Cornelis; Cioffi, Maria Odila Hilario; da Da Silva, Maria Lucia Caetano Pinto
Fonte: Universidade Estadual Paulista Publicador: Universidade Estadual Paulista
Tipo: Artigo de Revista Científica Formato: 867-878
ENG
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In recent years studies concerning the applications of lignocellulosic/ inorganic couples have resulted in the development of an interesting class of functional materials. In this work a cellulose/NbOPO 4.nH 2O hybrid using cellulose from surgacane bagasse was prepared and characterized in order to test for adsorption applications. The preparation process was conducted by carrying out metallic niobium dilution in hydrofluoric acid in the presence of nitric acid, then adding boric acid to form the complex and, finally, the cellulose sugar cane bagasse was added. Concentrated phosphoric acid was also inserted to precipitate hydrous niobium phosphate particles in the cellulose fiber. This material was characterized by X-ray diffractometry (XRD), thermogravimetry (TG/DTG), and scanning electronic microscopy (SEM) connected to an energy dispersive spectrophotometer (EDS). Results by SEM/EDS show that NbOPO 4.nH 2O was present in structure of the cellulose. During the preparation of the material, using boric acid it was observed that the formation of precipitate occurred in a shorter time than the material prepared without boric acid.

Bonelike/PLGA hybrid materials for bone regeneration : preparation route and physicochemical characterisation

Oliveira, Joaquim M.; Miyazaki, T.; Lopes, M. A.; Ohtsuki, C.; Santos, J. D.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Artigo de Revista Científica
Publicado em //2005 ENG
Relevância na Pesquisa
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Bonelike R /PLGA hybrid materials have been developed using γ -MPS as silane-coupling agent between the inorganic and organic phases for controlled drug delivery applications. Silanization showed to be more effective when cyclohexane was used as a non-polar solvent (nP method) due to a chemical interaction between Bonelike R and the silane film, while by using a 95/5 (V/V) methanol/water as a polar solvent (P method), a much thinner film was achieved. Functional groups of PLGA, such as the carbonyl group (C O), were identified using Raman and FTIR-ATR analysis and therefore these groups may be used to link therapeutic molecules. These novel hybrid materials prepared by combining silanization and post-hybridisation processes are expected to find use in medical applications of bone regeneration and as drug delivery carrier for therapeutic molecules.

Biocompatible Polymer/Quantum Dots Hybrid Materials: Current Status and Future Developments

Shen, Lei
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
Publicado em 02/12/2011 EN
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Quantum dots (QDs) are nanometer-sized semiconductor particles with tunable fluorescent optical property that can be adjusted by their chemical composition, size, or shape. In the past 10 years, they have been demonstrated as a powerful fluorescence tool for biological and biomedical applications, such as diagnostics, biosensing and biolabeling. QDs with high fluorescence quantum yield and optical stability are usually synthesized in organic solvents. In aqueous solution, however, their metallic toxicity, non-dissolubility and photo-luminescence instability prevent the direct utility of QDs in biological media. Polymers are widely used to cover and coat QDs for fabricating biocompatible QDs. Such hybrid materials can provide solubility and robust colloidal and optical stability in water. At the same time, polymers can carry ionic or reactive functional groups for incorporation into the end-use application of QDs, such as receptor targeting and cell attachment. This review provides an overview of the recent development of methods for generating biocompatible polymer/QDs hybrid materials with desirable properties. Polymers with different architectures, such as homo- and co-polymer, hyperbranched polymer, and polymeric nanogel, have been used to anchor and protect QDs. The resulted biocompatible polymer/QDs hybrid materials show successful applications in the fields of bioimaging and biosensing. While considerable progress has been made in the design of biocompatible polymer/QDs materials...

Carbon nanotube based hybrid nanostructures: Synthesis and applications

Ou, Fung Suong
Fonte: Universidade Rice Publicador: Universidade Rice
ENG
Relevância na Pesquisa
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Hybrid nanostructures are fascinating materials for their promising applications in future nanoelectronics, electrical interconnects and energy storage devices. Practical ways of connecting individual carbon nanotubes to metal contacts for their use as interconnects and in electronic devices have been challenging. In this thesis, carbon nanotube based hybrids that combine the best properties of carbon nanotubes and metal nanowires have been fabricated. The electrical properties and Raman spectra of the hybrid nanowires are also studied. This thesis will focus on our recent results in the development of carbon nanotube hybrids for various applications. Various hybrid structures of multiwalled carbon nanotubes and metal nanowires can be fabricated using a combination of electrodeposition and chemical vapor deposition techniques. Controlled fabrication of multi-segmented structures will be studied. Several novel applications of these structures, for example, as electrodes in ultra-high power supercapacitors, multi-functional smart materials are also studied. The thesis will also highlight the development of carbon nanotube hybrids based smart materials. Hybrid nanowires with hydrophobic carbon nanotube tails and hydrophilic metal nanowire heads...

Materiais híbridos nanoestruturados à base de hidróxidos duplos lamelares e o fármaco sulindaco; Nanostructured hybrid materials based on layered double hydroxides and the sulindac drug

Rocha, Michele Aparecida
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 05/08/2015 PT
Relevância na Pesquisa
48.173203%
Os hidróxidos duplos lamelares (HDLs) são matrizes inorgânicas bidimensionalmente estruturadas que apresentam propriedades diversas e interessantes para a formação de materiais híbridos. Em especial na área medicinal e farmacológica, o emprego de HDLs com lamelas contendo os íons Mg/Al e Zn/Al tem mostrado resultados promissores como antiácidos e como carregadores de fármacos. Por outro lado, anti-inflamatórios não esteroidais como o sulindaco são moléculas orgânicas ionizáveis que podem ser intercalados em HDLs levando à formação de materiais híbridos com potencial para uso na área farmacêutica. Este trabalho consistiu na síntese e na caracterização de materiais híbridos baseados em matrizes de HDLs de ZnRAl e MgRAl (R é a razão molar MII/Al) e o ânion derivado do fármaco sulindaco (abreviados M2IIAl-Sul). Foram avaliadas as condições experimentais mais apropriadas para a obtenção de materiais com alta cristalinidade e alto conteúdo do fármaco. Os materiais híbridos preparados por um método simples de coprecipitação (one pot) à temperatura ambiente e a 55°C apresentaram capacidade de carregamento de 50 a 55% (em massa) de sulindaco. Os difratogramas de raios X dos híbridos M2IIAl-Sul indicaram a formação de materiais mais cristalinos a 55°C...

Synthesis and characterization of inorganic-organic hybrid materials based on the intercalation of stable organic radicals into a fluoromica clay

Zeng, Zhaoyang; Matuschek, David; Studer, Armido; Schwickert, Christian; Pöttgenc, Rainer; Eckert, Hellmut
Fonte: Royal Society of Chemistry - RSC; Cambrige Publicador: Royal Society of Chemistry - RSC; Cambrige
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
47.576074%
Hybrid materials, in which stable organic radical cations are intercalated into layered inorganic host materials, can be successfully synthesized via an ion exchange reaction in a layered fluoromica clay, to yield recyclable heterogeneous catalysts for oxidation of various alcohols. We have conducted systematic synthetic and structural studies on the intercalation of the radical cations 4-(diethylmethylammonium)- 2,2,6,6-tetramethylpiperidin-1-oxyl (DEMTEP), 1-[2-(4-amino-2,2,6,6-tetramethyl-1-piperidinyloxyl)-2- oxoethyl]-1'-methyl-4,4'-bipyridinium (VIOTEP), and 2-(3-N-methylpyridinium)-4,4,5,5-tetramethyl-4,5- dihydro-1H-imidazol-1-oxyl-3-N-oxide (m-MPYNN) into a synthetic fluoromica clay named Somasif® ME 100, Na2xMg3.0−xSi4O10(FyOH1−y)2 (x = 0.33, y = 0.98). The guest-host interactions in these intercalation compounds have been characterized by X-ray powder diffraction and solid-state NMR of the constituent nuclei (23Na, 19F, and 29Si) of the Somasif structure. The intercalation process can be conveniently monitored using 23Na MAS-NMR. Guest-guest interactions have been probed by magnetic susceptibility measurements as well as EPR and 1H MAS NMR experiments. The 1H MAS-NMR line widths and chemical shifts probe modifications in the electron spin density distributions and/or intermolecular interactions between the electron spins of the guest species. Despite these indications of weakly interacting spins...

Films delgados mesoporosos de óxidos metálicos, mixtos e híbridos. Hacia un diseño racional de nanomateriales funcionales; Mesoporus metallic, mixed and hybrid oxide thin films. Towards a rational design of functional nanomaterials

Angelomé, Paula C.
Fonte: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires Publicador: Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires
Tipo: info:eu-repo/semantics/doctoralThesis; tesis doctoral; info:eu-repo/semantics/publishedVersion Formato: application/pdf
Publicado em //2008 SPA
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58.29976%
Los óxidos mesoporosos son materiales que presentan poros monodispersos (de tamaños de entre 2 y 50 nm) altamente ordenados, de elevada área específica (100 - 1000 m2/g). Se sintetizan mediante la combinación de dos procesos: reacciones sol gel, que dan lugar al material inorgánico o híbrido, y autoensamblado de moléculas anfifílicas, que actúan como molde de los poros. Entre las aplicaciones de estos materiales se encuentran: (foto)catálisis, sorción, sensores y otros dispositivos, etc. En este trabajo se realizó un estudio de la síntesis de films delgados mesoporosos de óxidos metálicos, mixtos e híbridos orgánico-inorgánicos. Estos films delgados se obtuvieron mediante dip coating a través del proceso conocido como Autoensamblado Inducido por Evaporación, y fueron caracterizados mediante una gran variedad de técnicas de microscopía, espectroscopia y difracción, de manera de conocer cabalmente la estructura a nivel micro, meso y macroscópico. En una primera parte, se presenta la síntesis de films delgados mesoporosos de TiO2, ZrO2 y óxidos mixtos Ti-Si, Zr-Si. En todos los casos, se estudió la relación existente entre la estructura del material obtenido y las condiciones de síntesis (composición del sol...

Chemical synthesis of hybrid materials based on PAni and PEDOT with polyoxometalates for electrochemical supercapacitors

Vaillant, Julien; Lira-Cantú, Monica; Cuentas Gallegos, A. K.; Casañ Pastor, Nieves; Gómez-Romero, P.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artículo Formato: 579917 bytes; image/jpeg
ENG
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Advanced Functional Nanomaterials - from NanoscaleObjects to Nanostructered Inorganic and Hybrid Materials; Hybrid organic–inorganic materials based on conjugated polymers constitute state-of-the-art compounds with recognized technological implications. In the area of energy conversion, production and storage devices, these materials have been applied as electrodes for batteries, supercapacitors, fuel cells or solar cells, among others. Their importance relies on the wide variety of organic and inorganic counterparts that these hybrids can be made of. The properties from each part can be tailored in order to contribute to a final desired characteristic or the combined properties from both. The unique combination of useful properties found in these materials include electronic conductivity (e− or h+), ionic transport, reversible electroactivity, electrooptical properties typical of semiconductors as well as electrochromic, pH- and composition-dependent properties, all of them to add to their polymeric nature. This is an excellent basis for the design of hybrid materials in which either of these properties or their combinations work to enhance or combine with those of a myriad inorganic phases with electronic, magnetic, photochemical...

Hybrid materials. Functional properties. From Maya Blue to 21st century materials

Gómez-Romero, P.; Sánchez, Clément
Fonte: Royal Society of Chemistry (Great Britain) Publicador: Royal Society of Chemistry (Great Britain)
Tipo: Artículo Formato: 808619 bytes; application/pdf
ENG
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The field of hybrid organic-inorganic materials has reached a stage of ripeness that is beginning to make possible extraordinary new developments. On the one hand the field has witnessed a trend towards the design of functionality in hybrids materials, while broadening spectacularly the variety of hybrid combinations explored. On the other hand, improved understanding and control of the chemistry, processing and microstructure of these versatile nanocomposite systems announce a new landscape of opportunities in dealing with increasingly complex chemistries and materials.; Peer reviewed

Integration of Hexacyanoferrate as Active Species in a Molecular Hybrid Material. Transport Properties and Application of PAni/HCF as Cathode in Rechargeable Lithium Batteries

Torres-Gómez, G.; Tejada Rosales, E. M.; Gómez-Romero, P.
Fonte: American Chemical Society Publicador: American Chemical Society
Tipo: Artículo Formato: 579917 bytes; image/jpeg
ENG
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47.73234%
Especial Issue on Nanocomposite Materials.; The hybrid organic-inorganic material formed by polyaniline and the hexacyanoferrate anion (PAni/HCF) constitutes a molecular hybrid where the anchoring of the electroactive anion within the polymer leads to its application as a functional material that harnesses the activity of the molecular species. Transport measurements of the hybrid have been carried out, both by cyclic voltammetry at different scan rates and ac impedance spectroscopy. An apparent diffusion coefficient of 5 10-8 cm2/s and an activation energy of 15.5 kJ/mol (0.16 eV) have been obtained. The particular application of these hybrids to energy storage is shown here through their use as cathodes in lithium rechargeable cells. In this respect, the PAni/HCF hybrids show very good cyclabilities and high specific charges of up to 140 A.h/ kg, unprecedented for this type of hybrid materials; This work was funded by CICYT (Spain) (MAT98-0807-C02-02). We thank the Ministry of Education and Culture (Spain) for predoctoral fellowships awarded to G.T.G. and E.M.T.R.; Peer reviewed

Hybrid Nanocomposite Materials

Gómez-Romero, P.; Lira-Cantú, Monica
Fonte: John Wiley & Sons Publicador: John Wiley & Sons
Tipo: Capítulo de libro Formato: 579917 bytes; image/jpeg
ENG
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In: Kirk-Othmer Encyclopedia of Chemical Technology; Hybrid organic–inorganic materials constitute a fast-growing field that has already led to a very large variety of materials and applications. These nanocomposite materials abound both with organic or inorganic matrices and represent oportunities to design eclectic materials by taking advantage of the best properties of their components. But the hybrid concept can even go beyond this approach by creating materials with novel structures or supramolecular architectures, with synergic properties, or even with activities impossible for the isolated components. This article is a general review of the field, discussing the different categories of materials according to their chemical nature and their applications as structural or functional materials. A variety of hybrids with organic matrics (most commonly polymers) are distinguished from these in which the dominating phase is inorganic (polymeric or extended in nature). To the category of silicon-based hybrids that predominated in the early literature a larger variety of hybrids has followed which includes, among many others, inorganic molecular species intergrated in organic polymers, perovskites built with organic and inorganic building blocks or polymer-inserted inorganic phases. All of them are categorized and discussed with emphasis on their many different applications and commercial developments.; Peer reviewed

Hybrid Organic-Inorganic Materials - In Search of Synergic Activity

Gómez-Romero, P.
Fonte: John Wiley & Sons Publicador: John Wiley & Sons
Tipo: Artículo Formato: 579917 bytes; image/jpeg
ENG
Relevância na Pesquisa
67.774473%
Full-text available Open Access at: http://www.cienciateca.com/PGR_Review_Hybrids_AdvMat2001.pdf; This review surveys the work developed in the field of functional hybrid materials, especially those containing conducting organic polymers (COPs), in combination with a variety of inorganic species, from molecular to extended phases, including clusters and nano-sized inorganic particles. Depending on the dominating structural matrix, we distinguish and analyze organic-inorganic (OI) hybrids, nanocomposite materials, and inorganic-organic (IO) phases. These materials have been used in a wide variety of applications, including energy-storage applications, electrocatalysis, the harnessing of electrochromic and photoelectrochromic properties, application in display devices, photovoltaics, and novel energy-conversion systems, proton-pump electrodes, sensors, or chemiresistive detectors, which work as artificial noses.; Peer reviewed

Functional Hybrid Materials

Fonte: Wiley-VCH Publicador: Wiley-VCH
Tipo: Libro Formato: 579917 bytes; image/jpeg
ENG
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1. Edition - December 2003.-- XVII, 417 Pages; Here, a team of highly renowned experts gives an in-depth overview of the many fascinating facets of this field, illustrating the superiority of well-designed hybrid materials over conventional materials, and their potential applications as structural or functional materials in various fields.; From the contents Hybrid Materials, Functional Applications - An Introduction Organic-Inorganic Materials - From Intercalation Chemistry to Devices Bridged Polysilsesquioxanes - Molecular-Engineering Nanostructured Hybrid Organic-Inorganic Materials Porous Inorganic-Organic Hybrid Materials Optical Properties of Functional Hybrid Organic-Inorganic Nanocomposites Electrochemistry of Sol-Gel Derived Hybrid Materials Multifunctional Hybrid Materials Based on Conducting Organic Polymers - Nanocomposite Systems with Photo-Electro-Ionic Properties and Applications Layered Organic-Inorganic Materials - A Way Towards Controllable Magnetism Building Multifunctionality in Hybrid Materials Hybrid Organic-Inorganic Electronics Bioactive Sol-Gel Hybrids; Peer reviewed

Hybrid nanocomposite materials for energy storage and conversion applications

Gómez-Romero, P.; Cuentas Gallegos, A. K.; Lira-Cantú, Monica; Casañ Pastor, Nieves
Fonte: Springer Publicador: Springer
Tipo: Artículo Formato: 579917 bytes; image/jpeg
ENG
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Functional Hybrid materials based on conducting polymers and inorganic photo-electroactive species provide a wealth of opportunities for the development of novel materials with improved properties. Polyoxometalates are one type of well-known inorganic species with most interesting photo-electrochemical activity. They are perfect models for nanometer-sized oxide quantum-dots both concerning structure, topology and electrochemical and photochemical properties. Yet, they have not been applied as materials because of their molecular nature (i.e., soluble in most solvents or electrolytes). In our group we have recently developed a research line dealing with the integration of these fascinating clusters in conducting polymer matrices to yield functional hybrid materials. Our past emphasis was on electroactivity for energy-storage applications but these materials can also be used, as it is shown here, for photoelectrochemical applications.; The authors acknowledge partial financial support from the Ministry of Science and Technology (Spain) (Grant MAT2002-04529-C03) and express his deep gratitude for the total dedication of his Ph.D. students; Peer reviewed

Developing Hybrid Material Interfaces for Microcontact Printing and Molecular Recognition

Bowers, Carleen Morris
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Dissertação
Publicado em //2012
Relevância na Pesquisa
47.888286%

Monomolecular hybrid organic-inorganic interfaces provide opportunities for applications in fields ranging from sensors to electronics. In this thesis, we report our efforts towards (1) developing a universal method for the modification and soft-lithographic patterning of inorganic materials with stable and functional organic systems; and (2) apply our surface fabrication techniques to advance our understanding of molecular recognition force microscopy.

We report the development of a novel bi-layered molecular system that, in conjunction with an inkless catalytic microcontact printing technique, can be used to accurately replicate micro- and nano-scale patterns of chemically distinctive reactive functionalities on virtually any surface, including inorganic semiconductors. Catalytic printing alleviates problems associated with ink diffusion and enables high resolution replication of patterns through specific chemical or biochemical reaction between a functional surface and a stamp-immobilized catalyst. The methodology provides precise control over shape and size of pattern features and provides access to chemically discriminated patterns that can be further functionalized with organic and biological molecules. We demonstrate catalytic printing on both oxide-free silicon and germanium...