一维无机半导体纳米材料的制备及其表面可逆浸润性研究（英文）     

封心建  江雷 《中国科学院研究生院学报》2007,24(4):537-542

智能材料与界面材料有机结合，赋予界面材料智能特性将是研究智能材料的一个新领域. 通过水溶液以及低温水热合成方法，我们分别制备了氧化锌以及氧化钛一维无机半导体纳米棒薄膜。结合它们特殊的微观/宏观表面几何结构以及表面紫外光敏感性，在紫外光以及暗处保存的交替作用下，我们实现了表面超疏水以及超亲水的可逆转变性能。在这里，我们还讨论了一维纳米材料表面浸润性可逆转变的机理。这一原理可以拓展到其它具有类似纳米结构和外场相应性的纳米表面中。这些具有智能相应性的材料具有极其重要和广泛的工业用前景。  相似文献   

A partially fluorinated ligand for two super-hydrophobic porous coordination polymers with classic structures and increased porosities     

Chao Wang  Dong-Dong Zhou  You-Wei Gan  Xue-Wen Zhang  Zi-Ming Ye  Jie-Peng Zhang 《国家科学评论(英文版)》2021,8(3)

3-Ethyl-5-trifluoromethyl-1,2,4-triazole is synthesized by a one-pot reaction. Using this asymmetric triazole ligand bearing one trifluoromethyl and one ethyl as side groups, we construct two new porous coordination polymers, MAF-9 and MAF-2F, being isostructural with the classic hydrophobic and flexible materials, FMOF-1 and MAF-2, based on symmetric triazole ligands bearing two trifluoromethyl groups or two ethyl groups, respectively. MAF-9 and MAF-2F can adsorb large amounts of organic solvents but completely exclude water, showing superhydrophobicity with water contact angles of 152^o in between those of FMOF-1 and MAF-2. MAF-9 exhibits very large N₂-induced breathing and colossal positive and negative thermal expansions like FMOF-1, but the lower molecular weight and smaller volume of MAF-9 give 16% and 4% higher gravimetric and volumetric N₂ uptakes, respectively. In contrast, MAF-2F is quite rigid and does not show the inversed temperature-dependent N₂ adsorption and large guest-induced expansion like MAF-2. Further, despite the higher molecular weight and larger volume, MAF-2F possesses 6% and 25% higher gravimetric and volumetric CO₂ uptakes, respectively. These results can be explained by the different pore sizes and side group arrangements in the two classic framework prototypes, which demonstrate the delicate roles of ligand side groups in controlling porosity, surface characteristic and flexibility.  相似文献