Preparation of periodic mesoporous organosilica with large mesopores using silica colloidal crystals as templates
Preparation of periodic mesoporous organosilica with large mesopores using silica colloidal crystals as templates
复制标题
以二氧化硅胶体晶体为模板制备具有大介孔的周期性介孔有机二氧化硅
DOI：
10.1039/d0nr03837g
复制
发表时间：
2020-11-07
期刊：
影响因子：
6.7
通讯作者：
Shimojima, Atsushi
中科院分区：
文献类型：
--
作者：
Muramoto, Naho;Sugiyama, Tomoaki;Shimojima, Atsushi
具有周期性有序孔道的有机硅氧烷基介孔材料（周期性介孔有机硅，PMO）由于其多种有机功能、高比表面积和大孔体积而具有许多应用。使用表面活性剂模板（软模板）的传统方法在有机硅烷前体的多样性和对相对较大介孔区域（10-50 nm）孔径的精确控制方面受到限制。本文展示了以单分散二氧化硅纳米球胶体晶体为模板，制备具有精确控制孔径（直径>10 nm）和各种有机硅氧烷骨架的PMO。通过水解有机烷氧基硅烷[(EtO)(3)Si-R-Si(OEt)(3)，R = C2H4、CHvCH和C6H4的缩聚反应，获得具有互连球形介孔的反蛋白石结构； PhSi(OEt)(3)]，在二氧化硅胶体晶体的空隙中，然后在良好控制的碱性条件下优先溶解二氧化硅。孔径随二氧化硅纳米球的尺寸而变化。该方法的多功能性将允许广泛调整有机硅氧烷基介孔材料的物理和化学性质。
Organosiloxane-based mesoporous materials with periodically ordered pores (periodic mesoporous organosilica, PMO) have many applications due to their various organic functions, high surface areas, and large pore volumes. Conventional methods using surfactant templates (soft templates) are limited in terms of the diversity of organosilane precursors and precise control over the pore size in a relatively large mesopore region (10-50 nm). This paper demonstrates the preparation of PMOs with precisely controlled pore sizes (>10 nm in diameter) and various organosiloxane frameworks, using colloidal crystals of monodisperse silica nanospheres as a template. An inverse opal structure with interconnected spherical mesopores was obtained through polycondensation of hydrolyzed organoalkoxysilanes [(EtO)(3)Si-R-Si(OEt)(3), R = C2H4, CHvCH, and C6H4; PhSi(OEt)(3)], within the voids of silica colloidal crystals, followed by the preferential dissolution of silica under well-controlled basic conditions. The pore size varied depending on the size of the silica nanospheres. The versatility of this method will allow for the wide tuning of the physical and chemical properties of organosiloxane-based mesoporous materials.