材料科学
多孔性
氧化剂
金属
配体(生物化学)
化学工程
电导率
纳米纤维
聚合物
超临界流体
金属有机骨架
超临界干燥
纳米技术
复合材料
有机化学
冶金
化学
受体
吸附
物理化学
工程类
生物化学
作者
D. Vallejo-Sánchez,Pilar Amo‐Ochoa,Garikoitz Beobide,Óscar Castillo,Michael Fröba,Frank Hoffmann,Antonio Luque,P. Ocón,Sonia Pérez‐Yáñez
标识
DOI:10.1002/adfm.201605448
摘要
Metal‐organic gels (MOGs) appear as a blooming alternative to well‐known metal‐organic frameworks (MOFs). Porosity of MOGs has a microstructural origin and not strictly crystalline like in MOFs; therefore, gelation may provide porosity to any metal‐organic system, including those with interesting properties but without a porous crystalline structure. The easy and straightforward shaping of MOGs contrasts with the need of binders for MOFs. In this contribution, a series of MOGs based on the assembly of 1D‐coordination polymer nanofibers of formula [M(DTA)] n (M II : Ni, Cu, Pd; DTA: dithiooxamidato) are reported, in which properties such as porosity, chemical inertness, mechanical robustness, and stimuli‐responsive electrical conductivity are brought together. The strength of the MS bond confers an unusual chemical resistance, withstanding exposure to acids, alkalis, and mild oxidizing/reducing chemicals. Supercritical drying of MOGs provides ultralight metal‐organic aerogels (MOAs) with densities as low as 0.03 g cm −3 and plastic/brittle behavior depending on the nanofiber aspect ratio. Conductivity measurements reveal a semiconducting behavior (10 −12 to 10 −7 S cm −1 at 298 K) that can be improved by doping (10 −5 S cm −1 ). Moreover, it must be stressed that conductivity of MOAs reversibly increases (up to 10 −5 S cm −1 ) under the presence of acetic acid.
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