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首页> 外文期刊>Journal of nanoscience and nanotechnology >Inorganic-Salts Assisted Self-Assembly of Pluronic F127-Organosilica into Ordered Mesostructures
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Inorganic-Salts Assisted Self-Assembly of Pluronic F127-Organosilica into Ordered Mesostructures

机译：无机盐辅助将Pluronic F127-有机硅自组装为有序介观结构

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摘要

Periodic mesoporous organosilicas (PMOs) have been synthesized through the condensation of organosilicates 1,2-bis(trimethoxysilyl) ethane around inorganic-electrolyte-stabilized Pluronic F127 [(EO)(106)(PO)(70)(EO)(106)] triblock copolymer micelles in a sodium bicarbonate (NaHCO3)/sodium carbonate (Na2CO3) buffer solution (pH approximate to 9.9). It is found that the addition of inorganic sulfate salts in the synthesis is crucial factor to ensure the formation of ordered mesostructures. The addition of Na2SO4 and MgSO4 in the synthesis system can lead to the formation of ordered 2-D hexagonal (P6mm) and 3-D cubic (Im3m) mesostructure, respectively. The effects of other inorganic sulfate salts such as CuSO4, NiSO4, and ZnSO4 have also been investigated. Apparently, the interaction between Pluronic F127 micelle and organosilica oligomers is enhanced by the presence of these inorganic salts. The mechanism for PMOs formation has been proposed on the basis of inorganic salts assisted micelles-organosilicates closed packing under mild synthetic condition. The findings from this work contribute fundamental understanding towards a new formation route of these ordered mesoporous materials, thus providing a new strategy to fabricate mesoporous silicas with controllable structures for emerging applications.
机译：周期性介孔有机二氧化硅（PMO）是通过有机硅酸盐1,2-双（三甲氧基甲硅烷基）乙烷在无机电解质稳定的Pluronic F127周围缩合而合成的（（EO）（106）（PO）（70）（EO）（106））在碳酸氢钠（NaHCO3）/碳酸钠（Na2CO3）缓冲溶液（pH约9.9）中的三嵌段共聚物胶束。发现在合成中添加无机硫酸盐是确保形成有序介观结构的关键因素。在合成系统中添加Na2SO4和MgSO4可以分别形成有序的2-D六角形（P6mm）和3-D立方（Im3m）介观结构。还研究了其他无机硫酸盐如CuSO4，NiSO4和ZnSO4的作用。显然，这些无机盐的存在增强了Pluronic F127胶束与有机硅低聚物之间的相互作用。在温和的合成条件下，基于无机盐辅助的胶束-有机硅酸盐密堆积，提出了PMOs的形成机理。这项工作的发现为这些有序介孔材料的新形成途径提供了基本的理解，从而为制造具有可控结构的新兴应用的介孔二氧化硅提供了新的策略。

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