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多壳层空心结构金属有机框架(MOF)材料的控制合成
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摘要
多层空心材料具有渗透性良好、密度低等特性,在光催化、能量存储、可控缓释等方面都具有潜在的应用前景,是一类具有良好应用价值的材料。然而,对于多层空心材料的控制合成和应用的研究多集中在无机材料,对于多层空心MOF材料的控制合成和应用方面的研究很少。我们通过多步生长以及质子刻蚀的方法合成了多壳层空心结构的MOF材料,通过XRD、BET对材料的结构进行表征,发现得到的多壳层空心MOF依然具有高度结晶性和高比表面积。并且通过改变MOF生长液的浓度,可以调控空心的壁厚。到的多壳层空心MOF表现出了良好的药物吸附性能,并且吸附性能随着空心层数的增加而增加。
Hollow-based metal–organic frameworks(MOFs) containing crystalline thin shells and enclosed large cavities have attracted great interest because of their unique properties. However, the synthesis of them still remains a challenge. Herein, we report the formation of multishell hollow MOF with single-crystalline structure by step-by-step crystal growth and subsequent etching processes. In addition, the cavity size and the shell thickness of each layer can be exquisitely tailored by regulating the reactant concentration for the synthesis of each layer and the etching time. The resultant multishell hollow MOF significantly increase drug loading capacity when using ibuprofen(IBU) and doxorubicin(DOX) as model drugs. We anticipate that the multishell hollow MOF structure is powerful for the exploration of potential applications of MOFs.
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