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Mesoscopic 2-D ordering of inorganic/organic hybrid materials 总被引:1,自引:0,他引:1
O. Karthaus X. Cieren N. Maruyama M. Shimomura 《Materials science & engineering. C, Materials for biological applications》1999,10(1-2):103-106
Organic–inorganic hybrid materials with micronsized (i.e., mesoscopic) network structures are expected to have interesting properties and applications in various fields, such as separation, catalysis, biomineralization, or quantum optics. Here a new method is introduced to produce thin films of two-dimensionally ordered honeycomb structures. Casting a chloroform solution of a mixture of organic amphiphiles with metal acetylacetonates or -alkoxides at high atmospheric humidity leads to the formation of a closely packed layer of water droplets on top of the organic solvent. The water acts as a template, After evaporation of the chloroform and the water, a honeycomb structure remains. Pyrolysis of the metal alkoxides films lead to the formation of microporous metal oxide (e.g., anatase, one of the catalytic active titanium oxides). 相似文献
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Boissiere C Grosso D Chaumonnot A Nicole L Sanchez C 《Advanced materials (Deerfield Beach, Fla.)》2011,23(5):599-623
The major advances in the field of the designed construction of hierarchically structured porous inorganic or hybrid materials wherein multiscale texturation is obtained via the combination of aerosol or spray processing with sol-gel chemistry, self-assembly and multiple templating are the topic of this review. The available materials span a very large set of structures and chemical compositions (silicates, aluminates, transition metal oxides, nanocomposites including metallic or chalcogenides nanoparticles, hybrid organic-inorganic, biohybrids). The resulting materials are manifested as powders or smart coatings via aerosol-directed writing combine the intrinsic physical and chemical properties of the inorganic or hybrid matrices with defined multiscale porous networks having a tunable pore size and connectivity, high surface area and accessibility. Indeed the combination of soft chemical routes and spray processing provides "a wind of change" in the field of "advanced materials". These strategies give birth to a promising family of innovative materials with many actual and future potential applications in various domains such as catalysis, sensing, photonic and microelectronic devices, nano-ionics and energy, functional coatings, biomaterials, multifunctional therapeutic carriers, and microfluidics, among others. 相似文献
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C Jeffrey Brinker 《Current Opinion in Solid State & Materials Science》1996,1(6):798-805
The field of porous, inorganic materials is experiencing explosive growth, as is shown by more than 6000 literature citations since 1994 along with numerous recent symposia and workshops that have been devoted to this topic. Much of the recent interest has been fueled by new synthetic strategies, such as ‘supramolecular templating’, that have enabled precise engineering of pore size, shape, and connectivity on the mesoscopic scale. In general, template-based approaches involving the cooperative organization of organic—inorganic assemblies as intermediates are emerging as a promising conceptual basis for future developments in the field of porous inorganic materials, such as the synthesis of hierarchical morphologies that mimic the intricate structures found so often in nature. 相似文献
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《Current Opinion in Solid State & Materials Science》2003,7(4-5):273-281
Significant advances in bioinorganic materials chemistry during the past eighteen months have provided much impetus for current developments in nanostructured materials. In particular, studies on biomolecules that are either directly associated with the deposition of biominerals, or involved in specific molecular recognition/self-assembly processes coupled to inorganic phases have continued to inspire new strategies for the design of complex materials at all length scales. 相似文献
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以4-[乙基-(2-羟乙基)胺]-4’-硝基偶氮苯(DRl)为生色团,甲基丙烯酸甲酯(MMA)和正硅酸乙酯frEOS)为先体,通过原位溶胶-凝胶技术制备了新型的以PMMA/SiO2复合材料为掺杂基质的二阶非线性光学杂化材料,并运用提拉法在洁净的ITO导电玻璃上制备出均匀、透明的厚度为1μm左右的杂化薄膜。DSC测得杂化材料的玻璃化转变温度为130℃;二次谐波产生(SHG)测量结果表明杂化薄膜在电晕极化后二阶非线性系数d33为1.02×10^7esu;用UV-vis光谱对杂化膜在极化前后的取向和取向稳定性进行的研究表明此材料具有较高的取向度,且常温下的取向稳定性也较好,60d后取向序参数φ仍有初始值的85%。 相似文献
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In this paper, a new terbium complex/inorganic/polymeric molecular hybrid material was prepared and its optical properties were studied. At first, 4-nitrobenzoic acid was modified by (3-aminopropyl) trimethoxysilane to form a precursor and coordinated with terbium ion. Then it was polymerized with inorganic host tetraethoxysilane or polymer host polyvinyl alcohol and formed hybrid material. 1H NMR Fourier transform infrared (FT-IR), scanning electron microscope and TGA were applied to characterize the structure of the precursor. UV-vis spectrophotometer and fluorescence spectra were applied to characterize the photophysical properties of the obtained hybrid material. The strong luminescence of Tb3+ substantiates optimum energy couple and effective intramolecular energy transfer between the triplet state energy of modified ligand bridge and emissive energy level of Tb3+. 相似文献
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A. Barthelemy C. Duchamp J.-P. Uttaro C. Rousseau B. Fenet G. Ananchenko S. Lang A.W. Coleman J. Ripmeester C. Guillard L. Elsellami R. Lamartine C. Felix F. Vocanson 《Materials science & engineering. C, Materials for biological applications》2008,28(5-6):977-984
Translucent organic–inorganic hybrid porous silica materials have been prepared via the acid-catalysed hydrolysis and condensation of TEOS and various p-sulphonatocalix[n]arene derivatives. Xerogels and aerogels have been prepared. The morphology of the gels was characterized by electron microscopy (SEM and ESEM) and by hyperpolarized 129Xe NMR. The aerogels showed a porous structure not influenced by the size of the calixarene derivative incorporated in the gel. The efficiency of these new materials towards the retention of ammonium ions was discussed. 相似文献
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The room-temperature setting process in compacts of various silicate and non-silicate mineral particles bonded with sodium silicate was found to be markedly accelerated by treatment with the acidic gases CO2, S02 and H2S, but was unaffected by neutral or alkaline gases. Strength development increases with gassing time up to a maximum value which depends on the Si to Na ratio of the sodium silicate, the nature of the mineral matter and the gas used. Longer gassing times are needed to achieve ultimate strength with sodium silicates of higher pH and gases of lower solubility in water. The chemical species formed by reaction of CO2, S02 and H2S with sodium silicate were investigated by IR spectroscopy, X-ray diffraction and 29-Si solid state NMR spectroscopy. 相似文献
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《Current Opinion in Solid State & Materials Science》1998,3(2):132-136
In recent years, research into the chemistry of high temperature superconducting copper oxides has witnessed a noticeable shift towards a detailed investigation of chemical manipulation of the anion (rather than the cation) sublattice, not only to achieve optimum electronic properties but also to create new superconducting phases. Reactions involving the low temperature insertion of fluorine have played a key role, and have rekindled interest in alternative synthetic strategies for oxide fluoride superconductors. Fluorine insertion into fullerenes has also attracted attention due to its potential for the synthesis of new materials with unique properties. 相似文献
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Throughout history, scientists and engineers have relied on the slow and serendipitous trial-and-error process for discovering and developing new materials. In contrast, an emerging theme in modern materials science is the notion of intelligent design of materials. Pioneered by the pharmaceutical industry and adapted for the purposes of materials science and engineering, the combinatorial approach represents a watershed in the process of accelerated discovery, development and optimization of materials. To survey large compositional landscapes rapidly, thousands of compositionally varying samples may be synthesized, processed and screened in a single experiment. Recent developments have been aided by innovative rapid characterization tools, and by advanced materials synthesis techniques such as laser molecular beam epitaxy which can be used to perform parallel-processed design and control of materials down to the atomic scale. Here we review the fast-growing field of combinatorial materials science, with an emphasis on inorganic functional materials. 相似文献
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V. I. Sagadeev 《Journal of Engineering Physics and Thermophysics》1990,58(1):91-94
Monochromatic reflectivity is measured on compacted specimens of powdered inorganic materials. The measured spectra are compared with literature data.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 58, No. 1, pp. 105–108, January, 1990. 相似文献
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Dongfeng Xue Keyan Li Jun Liu Congting Sun Kunfeng Chen 《Materials Research Bulletin》2012,47(10):2838-2842
In this article, we briefly summarized our recent work on the studies of crystallization and functionality of inorganic materials. On the basis of the chemical bonding theory of single crystal growth, we can quantitatively simulate Cu2O crystallization processes in solution system. We also kinetically controlled Cu2O crystallization process in the reduction solution route. Lithium ion battery and supercapacitor performances of some oxides such as Co3O4 and MnO2 were shown to elucidate the important effect of crystallization on functionality of inorganic materials. This work encourages us to create novel functionalities through the study of crystallization of inorganic materials, which warrants more chances in the field of functional materials. 相似文献
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对高马赫数导弹天线罩材料的性能要求进行了评述,综述了国外天线罩材料的研究进展,特别是重点介绍了美国等军事强国近年来研制的天线罩材料的温度、强度、介电特性以及工艺性能。分析了我国在该领域的研究现状,并提出了今后的发展方向。 相似文献