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模板法合成中孔炭材料 总被引:1,自引:1,他引:0
在综合分析无机模板法和有机模板法的基础上,提出矿物模板法和复合模板法是制备中孔炭的有效方法.矿物模板法原料价格低廉、来源广泛.复合模板法综合了软模板和硬模板的优点,能够拓展中孔炭的结构、性能和应用领域.以矿物模板制备的炭材料具有良好的电学、医学性能等,有望获得良好性价比的中孔炭材料. 相似文献
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介孔炭材料及介孔炭/氧化硅复合材料对大分子有机污染物的吸附 总被引:1,自引:0,他引:1
介孔炭材料与活性炭相比具有较大的孔体积和孔径,高的比表面积以及规则的孔道结构,而介孔炭/氧化硅复合材料兼顾了活性炭与介孔材料的优点,因此在吸附大分子有机污染物方面有很好的应用前景。笔者综述了近年来介孔炭,负载/修饰后的介孔炭,介孔炭/氧化硅复合材料的制备和最新研究进展。在制备方面,根据其制备机理的不同可分为硬模板法和软模板法,制备出有序的介孔炭与介孔炭/氧化硅复合材料。在应用方面,重点介绍了介孔炭材料和介孔炭/氧化硅复合材料对大分子有机污染物的吸附性能。进而对介孔炭/氧化硅复合材料在吸附方面的应用进行了展望。 相似文献
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利用具有特定结构的物质作为模板,来引导纳米有序结构的制备与组装,从而实现对纳米材料的组成、结构、形貌、尺寸、取向和排布等的控制,为研究纳米有序体系的性质提供了有利途径.模板可以分为软模板和硬模板两种,本文介绍了氧化铝、胶体晶体、胶束、生物大分子等几种常见模板的特点.利用模板法,可以制备金属、合金、氧化物、半导体和聚合物及其复合组份等多种纳米结构有序体系.本文结合我实验室最近的研究工作综述了利用模板法制备纳米有序结构体系的研究进展. 相似文献
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Y. R. Liu 《Journal of Materials Science》2009,44(13):3600-3607
Mixed amphiphilic block copolymers of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO–PPO–PEO) and polydimethylsiloxane-poly(ethylene
oxide) (PDMS–PEO) have been successfully used as co-templates to prepare ordered mesoporous polymer–silica and carbon–silica
nanocomposites by using phenolic resol polymer as a carbon precursor via the strategy of evaporation-induced self-assembly
(EISA). The ordered mesoporous materials of 2-D hexagonal (p6m) mesostructures have been achieved, as confirmed by small-angle X-ray scattering (SAXS), transmission electron microscopy
(TEM), and nitrogen-sorption measurements. Experiments show that using PDMS–PEO as co-template can enlarge the pore sizes
and reduce the framework shrinkage of the materials without evident effect on the specific surface areas. Ordered mesoporous
carbons can then be obtained with large pore sizes of 6.7 nm, pore volumes of 0.52 cm3/g, and high surface areas of 578 m2/g. The mixed micelles formed between the hydrophobic PDMS groups and the PPO chains of the F127 molecules should be responsible
for the variation of the pore sizes of the resulting mesoporous materials. Through the study of characteristics of mesoporous
carbon and mesoporous silica derived from mother carbon–silica nanocomposites, we think mesoporous carbon–silica nanocomposites
with the silica-coating mesostructure can be formed after the pyrolysis of the PDMS–PEO diblock copolymer during surfactant
removal process. Such method can be thought as the combination of surfactant removal and silica incorporation into one-step.
This simple one-pot route provides a pathway for large-scale convenient synthesis of ordered mesostructured nanocomposite
materials. 相似文献
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Irina Ursachi Aurelia Vasile Adelina Ianculescu Eugeniu Vasile Alexandru Stancu 《Materials Chemistry and Physics》2011
Iron oxide nanoparticles were stabilized within the pores of mesoporous silica MCM-41 amino-functionalized by a sonochemical method. Formation of iron oxide nanoparticles inside the mesoporous channels of amino-functionalized MCM-41 was realized by wet impregnation using iron nitrate, followed by calcinations at 550 °C in air. The effect of functionalization level on structural and magnetic properties of obtained nanocomposites was studied. The resulting materials were characterized by powder X-ray diffraction (XRD), high-resolution transmission electron microscopy and selected area electron diffraction (HRTEM and SAED), vibrating sample and superconducting quantum interface magnetometers (VSM and SQUID) and nitrogen adsorption–desorption isotherms measurements. The HRTEM images reveal that the most of the iron oxide nanoparticles were dispersed inside the mesopores of silica matrix and the pore diameter of the amino-functionalized MCM-41 matrix dictates the particle size of iron oxide nanoparticles. The obtained material possesses mesoporous structure and interesting magnetic properties. Saturation magnetization value of magnetic iron oxide nanopatricles stabilized in MCM-41 amino-functionalized by in situ sonochemical synthesis was 1.84 emu g−1. An important finding is that obtained magnetic nanocomposite materials exhibit enhanced magnetic properties than those of iron oxide/MCM-41 nanocomposite obtained by conventional method. The described method is providing a rather short preparation time and a narrow size distribution of iron oxide nanoparticles. 相似文献
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Yingjie Jin Shanlin Zhao Ping Li Zhenbo Lv Shudong Zhang 《Materials Letters》2011,65(19-20):2959-2962
The hydrothermal synthesis of various mesoporous materials with mordenite (MOR) structures is performed under perturbation conditions involving varying-temperature crystallizations and the use of ternary organic templates, and at least three types of mesoporous materials are obtained from the same starting gel containing the ternary organic templates. The greater structural diversities of these materials are found to correlate remarkably with the second-staged crystallization temperature and time. Among these materials, the two mesoporous materials crystallized incompletely over low temperature periods are differently structural composites consisting of MOR crystallites within disordered mesoporous phases, whereas the mesoporous mordenite crystallized completely over relatively high temperature period possesses the intrinsic microporosity and hierarchical mesoporosity. TEM morphological investigations on the mesoporous mordenite crystals demonstrate the formation of intracrystalline mesopores. Furthermore, an entirely new approach to synthesize mesoporous MOR zeolites is proposed based on the pore-inducing role of MOR structure defects and the adequate perturbation towards synthesis conditions. 相似文献
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AbstractMesoporous materials have been paid much attention in both scientific researches and practical applications. In this review, we focus on recent developments on preparation and functionalization of new families of mesoporous materials, especially non-siliceous mesoporous materials invented in our research group. Replica synthesis is known as the method to synthesize mesoporous materials composed of various elements using originally prepared mesoporous replica. This strategy has been applied for the syntheses of novel mesoporous materials such as carbon nanocage and mesoporous carbon nitride. Carbon nanocage has a cage-type structure with huge surface area and pore volume, which exhibits superior capabilities for biomolecular adsorption. Mesoporous carbon nitride was synthesized, for first time, by using mixed material source of carbon and nitrogen simultaneously. As a totally new strategy for synthesis of mesoporous materials, the elemental substitution method has been recently proposed by us. Direct substitution of component elements in original mesoporous materials, with maintaining structural regularity, provided novel mesoporous materials. According to this synthetic strategy, mesoporous boron nitride and mesoporous boron carbon nitride have been successfully prepared, for first time. In addition to these material inventions, hybridization of high functional materials, such as biomaterials, to mesoporous structure has been also developed. Especially, immobilization of proteins in mesopores was systematically researched, and preparation of peptidehybridized mesoporous silica was demonstrated. These new families of mesoporous materials introduced in this review would have high potentials in future practical applications in wide ranges from electronics and photonics to environmental and medical uses. 相似文献
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Ajayan Vinu Toshiyuki Mori Katsuhiko Ariga 《Science and Technology of Advanced Materials》2006,7(8):753-771
Mesoporous materials have been paid much attention in both scientific researches and practical applications. In this review, we focus on recent developments on preparation and functionalization of new families of mesoporous materials, especially non-siliceous mesoporous materials invented in our research group. Replica synthesis is known as the method to synthesize mesoporous materials composed of various elements using originally prepared mesoporous replica. This strategy has been applied for the syntheses of novel mesoporous materials such as carbon nanocage and mesoporous carbon nitride. Carbon nanocage has a cage-type structure with huge surface area and pore volume, which exhibits superior capabilities for biomolecular adsorption. Mesoporous carbon nitride was synthesized, for first time, by using mixed material source of carbon and nitrogen simultaneously. As a totally new strategy for synthesis of mesoporous materials, the elemental substitution method has been recently proposed by us. Direct substitution of component elements in original mesoporous materials, with maintaining structural regularity, provided novel mesoporous materials. According to this synthetic strategy, mesoporous boron nitride and mesoporous boron carbon nitride have been successfully prepared, for first time. In addition to these material inventions, hybridization of high functional materials, such as biomaterials, to mesoporous structure has been also developed. Especially, immobilization of proteins in mesopores was systematically researched, and preparation of peptide-hybridized mesoporous silica was demonstrated. These new families of mesoporous materials introduced in this review would have high potentials in future practical applications in wide ranges from electronics and photonics to environmental and medical uses. 相似文献
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A new and efficient method for the preparation of MCM-41 type ordered mesoporous phases using phosphate as promoter under
reflux conditions is reported. The various mesoporous materials studied were: silica (Si-MCM-41), alumino-silicate (Al-MCM-41),
and titanium-silicate (Ti-MCM-41). Our concept of promoter-assisted synthesis of zeolites and related microporous materials
was found to be applicable in the synthesis of ordered mesoporous materials as well. The addition of small catalytic quantity
of phosphate ions (PO
4
3−
), used as promoters, significantly reduced the synthesis time (by a factor of 3–4) of all these mesoporous materials. The
synthesis of new MCM-41 type organic-inorganic composite materials with unique properties is also reported. 相似文献