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1.
Functional molecular nanoarchitectures (FMNs) are highly relevant for the development of future nanotechnology devices. Profound knowledge about the atomically controlled construction of such nanoscale assemblies is an indispensable requirement to render the implementation of such components into a real product successful. For exploiting their full potential the architectures’ functionalities have to be characterized in detail including the ways to tailor them. In recent years a plethora of sophisticated constructs were fabricated touching a wide range of research topics. 相似文献
2.
以配位聚合物凝胶为模板, 构筑均一的聚吡咯纳米线网络, 聚合后经简单处理除去模板, 得到性能优异的聚吡咯凝胶. 结果表明, 模板法合成的聚吡咯凝胶为由均一纳米线组成的三维网络结构, 具有良好的力学性能、 较大的比表面积及优异的电化学特性, 在0.28 A/g电流密度下, 比电容可达450 F/g, 在2.8 A/g电流密度下充放电1000次, 比电容仍可保持88.6%. 聚吡咯纳米线网络凝胶经葡萄糖氧化酶负载后得到柔性传感电极, 对低浓度(0.2 mmol/L)的葡萄糖具有快速响应性能, 有望用于超级电容器及生物电化学传感器等领域. 相似文献
3.
M. Douaire V. di BariJ.E. Norton A. SulloP. Lillford I.T. Norton 《Advances in colloid and interface science》2014
This review focuses on recent advances in the understanding of lipid crystallisation at or in the vicinity of an interface in emulsified systems and the consequences regarding stability, structure and thermal behaviour. Amphiphilic molecules such as emulsifiers are preferably adsorbed at the interface. Such molecules are known for their ability to interact with triglycerides under certain conditions. In the same manner that inorganic crystals grown on an organic matrix see their nucleation, morphology and structure controlled by the underlying matrix, recent studies report a templating effect linked to the presence of emulsifiers at the oil/water interface. Emulsifiers affect fat crystallisation and fat crystal behaviour in numerous ways, acting as impurities seeding nucleation and, in some cases, retarding or enhancing polymorphic transitions towards more stable forms. This understanding is of crucial importance for the design of stable structures within emulsions, regardless of whether the system is oil or water continuous. In this paper, crystallisation mechanisms are briefly described, as well as recent technical advances that allow the study of crystallisation and crystal forms. Indeed, the study of the interface and of its effect on lipid crystallisation in emulsions has been limited for a long time by the lack of in-situ investigative techniques. This review also highlights reported interfacial effects in food and pharmaceutical emulsion systems. These effects are strongly linked to the presence of emulsifiers at the interface and their effects on crystallisation kinetics, and crystal morphology and stability. 相似文献
4.
Since the discovery of ZSM-5 molecular sieves as a promising catalyst material, the synthesis of ZSM-5 has been investigated in great detail. In the first synthesis of ZSM-5,tetrapropylammonium(TPA) was used as the templating agent. However, the industrial manufacture and application of ZSM-5 molecular sieves arc limited because TPA, the templating agent, is expensive. In the attempt to search for a suitable substitute for TPA, 相似文献
5.
Qun Wang Zhongyi Jiang Yabo Wang Daimei Chen Dong Yang 《Journal of nanoparticle research》2009,11(2):375-384
Porous organic carbon-doped titania (C-TiO2) nanomaterials and their composites with Ag nanoparticles (Ag/C-TiO2) were synthesized by an eggshell membrane templating method, and their structural and photocatalytic properties were systematically
characterized. These nanomaterials, exhibiting a macroscopic morphology of a thin film, are composed of interwoven tubes,
and the tube wall consists of nanocrystals. The doped organic carbon was composed of the active carbon and carbonate species,
which could form a layer around the surface of TiO2 nanoparticles, while the silver was incorporated into Ag/C-TiO2 composites as separated Ag nanoparticles. The degradation of methylene blue under visible light irradiation was employed
to evaluate the photocatalytic activity of these as-prepared TiO2-based materials. Both C-TiO2 and Ag/C-TiO2 nanomaterials showed higher photocatalytic activity than pure TiO2 material–commercial Degussa P25. These results can be accounted for the coupling effect of the incorporation of carbon species
and Ag nanoparticles. 相似文献
6.
7.
The effect of four ionic liquids on the porous texture of silica aerogels synthesized from mixed tetramethoxysilane and methyltrimethoxysilane
and dried by the CO2 supercritical method, was studied. Two of these ionic liquids were composed of BF4
− anions while the other two included Cl− anions. The synthesis of gels from ionic liquids did not require another acidic catalyst for silica hydrolysis, nor a basic
catalyst for silica condensation. These aerogels were compared with traditional aerogels made according to a double step catalysis,
which first involved hydrolysis with HCl followed by condensation with pH 9 Tris HCl buffer. Gel mass analysis and thermogravimetric
data showed that, when the initial molar of ionic liquid to Si was 1.58, only ~2% (by mass) of the initial ionic liquids consisting
of BF4
− anions and ~10% (by mass) of ionic liquids containing Cl− anions, remained in the aerogels after supercritical drying. Moreover, X-ray diffraction confirmed that in ionic liquids
based on BF4
− anions, evaporation of the volatile components before supercritical CO2 drying led to the formation of regularly ordered mesopores. 相似文献
8.
Single-handed helical and C-shaped 3-aminophenol-formaldehyde resin nanotubes were prepared via a supramolecular templating approach. The chiral templates and 3-aminophenol were initially organized into helical nanoribbons, followed by the adsorption of formaldehyde onto the surfaces of the helical nanoribbons. Subsequent to polymerization and further thermosetting of the resin oligomers, 3-aminophenol-formaldehyde resin nanotubes were obtained after removing the templates. When low amounts of 3-aminophenol were added, straight C-shaped 3-aminophenol-formaldehyde resin nanotubes were obtained. Increasing the amount of added 3-aminophenol led to the formation of single-handed helical nanotubes instead. When the single-handed helical resin nanotubes were carbonized at 900℃ under Ar, single-handed helical carbonaceous nanotubes were obtained. Raman spectrum indicates that this carbon is predominantly amorphous. Circular dichroism spectra illustrate that both the helical resin nanotubes and the carbonaceous nanotubes exhibit optical activity. This work indicates that the added amount and the edge-adsorption mode of the precursors on the templates determine the final morphology and chirality of the products. 相似文献
9.
液晶模板法制备Au纳米线 总被引:12,自引:0,他引:12
利用非离子表面活性剂C12E4的层状液晶作为模板,以氯金酸(HAuCl4)水溶液作为体系的水相和反应物,并利用C12E4中EO基团的还原性制备了Au的纳米线.研究表明,反应物的浓度、液晶体系的组成和反应时间都将影响产物的形貌.在适当条件下,可以得到直径约为20nm,长度达到几微米的均匀金纳米线,并探讨了纳米线形成过程中层状液晶的模板作用. 相似文献
10.
胶粒晶体模板法制备三维有序大孔材料 总被引:2,自引:0,他引:2
使用胶粒模板法制备三维有序大孔材料(three-dimensional ordered macroporous material,3DOM)是一个快速发展的领域。本文综述了3DOM的合成技术,包括各种填充模板的方法、模板的去除方法以及它们在光子晶体、催化材料、生物传感器以及医学等方面的应用前景。 相似文献