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首页> 外文期刊>Journal of Sol-Gel Science and Technology >New Approach for the Organisation and the Shaping of Organo-Bridged Silicas:An Overview
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New Approach for the Organisation and the Shaping of Organo-Bridged Silicas:An Overview

机译：组织和形成有机桥二氧化硅的新方法：概述

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摘要

A new and general route to synthesize shape-controlled bridged silsesquioxanes has been developed by the hydrolysis-condensation of molecularly designed precursors bearing urea groups.The auto-association of the bridging organic units,owing to the hydrogen bonds developing between the urea groups,has been exploited to create new multifunctional organo-bridged silicas with peculiar shapes from the nano- to the micro-scale.Helical fibers with controlled handedness,hollow tubes and spheres,and lamellar plates have been produced according to the main organic substructure and also depending on the reaction conditions (catalyst,solvent and temperature).Spectroscopic techniques (solid state ~(13)C and ~(29)Si NMR,FTIR and X-ray diffraction) and electronic microscopic measurements (SEM and TEM) allowed the characterisation of these hybrid materials.
机译：通过对带有脲基团的分子设计前体进行水解缩合，已开发出一种新的，通用的合成形状可控的桥型倍半硅氧烷的方法。由于脲基团之间形成氢键，桥连有机单元的自动缔合可以开发出新型的，多功能的，从纳米级到微米级的特殊形状的有机桥连二氧化硅。根据主要的有机亚结构，还根据不同的有机结构，制备了具有可控手性的螺旋纤维，空心管和球体以及层状板。光谱技术（固态〜（13）C和〜（29）Si NMR，FTIR和X射线衍射）和电子显微镜测量（SEM和TEM）可以表征这些反应条件（催化剂，溶剂和温度）。混合材料。

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