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Formation mechanism of nano- and meso-scale integrated ordered structure using molecular assemblies as template

以分子组装体为模板的纳米和介观尺度集成有序结构的形成机制

基本信息

批准号：
12650750
负责人：
ADACHI Motonari
金额：
$ 2.37万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650750/
关键词：
nano structure integrated ordered structure formation mechanism liquid liquid interface silica titania nanotubes photocatalytic activity

项目摘要

1. Formation mechanism of nano-size unit structure1-1 Formation mechanism of nano-size silica structureVarious morphologies of microstructure were synthesized by pH variation in silica nano-structure formation by templating mechanism in laurylamine hydrochloride/tetraethoxysilane system. Integrated ordered structure such as hexagonal array was formed in the narrow pH region from 10 to 11.5.1-2 Formation mechanism of titania anotubesHighly photocatalytic single crystalline anatase titania nanotubes can be synthesized by templating mechanism in laurylamine hydrochloride/tetraisopropylorthotitanate modified with acetylacetone. Titania nanotubes were synthesized as amorphous phase and were crystallized in the rection process at 80 ℃ for 3days. The pore-size became large with proceeding crystallization.2. Elucidation of formation mechanism of the integrated ordered structure of silica Liquid-liquid interface between the organic and aqueous phases played an essential role for the formation of integrated ordered structure of silica at pH 10 to 11.5. The formation processes of integrated ordered structure in a few minutes at pH 10.5 were measured in every second by small angle X-ray scattering using syncrotron orbit radiation high power X-ray at SPring 8. We found that independent cylinders were formed first at the liquid-liquid interface and gathered with each other on the two-dimensional space of the interface to make an two- and three-dimensional integrated ordered structure.

1. 纳米单元结构的形成机理1-1纳米二氧化硅结构的形成机理在盐酸十二胺/四乙氧基硅烷体系中，通过pH的变化，通过模板机制形成二氧化硅纳米结构，合成了不同形态的微观结构。在10 ~ 11.5.1的狭窄pH范围内，形成了六方阵列等完整有序结构。1-2二氧化钛纳米管的形成机理在乙酰丙酮修饰的盐酸十二胺/四异丙基氯钛酸酯中，采用模板法制备了具有高光催化性能的单晶锐钛矿二氧化钛纳米管。以非晶相的形式合成二氧化钛纳米管，并在80℃的反应条件下结晶3天。随着结晶的进行，孔隙尺寸逐渐变大。在pH值为10 ~ 11.5的条件下，有机相与水相之间的二氧化硅液-液界面整体有序结构的形成机理的阐明对二氧化硅整体有序结构的形成起着至关重要的作用。利用同步轨道辐射高功率x射线在spring8上进行小角x射线散射，以每秒为单位测量了pH值10.5下几分钟内整体有序结构的形成过程。我们发现在液-液界面处首先形成独立的圆柱体，然后在界面的二维空间上相互聚集，形成二维和三维的整体有序结构。