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Research on Availability of Shear-induced Method for Making Bulk Colloidal-Photonic Crystals

剪切诱导法制备体胶体光子晶体的可行性研究

基本信息

批准号：
18550170
负责人：
SAWADA Tsutomu
金额：
$ 2.61万
依托单位：
National Institute for Materials Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18550170/
关键词：
Colloidal crystals Photonic crystals Crystal growth Shear effects Gelation

项目摘要

The purpose of this research is to clarify the characteristics of a new method that could be a East process to firm bulk, single-crystalline photonic crystals consisted of colloidal particles. The method proposed here is that the starting material of polycrystalline colloidal dispersion is realigned into a single-crystalline form by strong shear-flow.We investigated whether the shear-induced process was effective or not even for bulk samples as thick as millimeter size. Sheared samples were examined by optical spectrometry, and we found that transmittance of the samples was drastically increased and saturated with increasing the shear rate. Dependence of transmittance on the sample thickness was also investigated, and it was suggested that optical quality of the thick samples was as good as the thin sample. This means the shear-induced method is effective also Sir the thick (bulk) samples.However we encountered a problem for immobilizing the aligned thick colloidal crystals by means of photo-induced gelation. Attenuation of incident light causes insufficient polymerization inside, a sample especially when the sample is thick This problem could not be solved by simply strengthening light-irradiation, which caused deterioration in optical quality of gelled samples, and remained as future works.

本研究的目的是阐明一种新的方法，可以是一个东方的过程，以坚固的大块，单晶光子晶体的胶体粒子组成的特点。本文提出的方法是通过强剪切流将多晶胶体分散体的起始材料重新排列成单晶形式，我们研究了剪切诱导过程是否有效，即使对于厚至毫米尺寸的块状样品也是如此。对剪切后的样品进行了光谱分析，发现随着剪切速率的增加，样品的透过率急剧增加并达到饱和。研究了样品厚度对透射率的影响，发现厚样品的光学质量与薄样品一样好。这意味着剪切诱导法对厚样品也是有效的，但是我们遇到了一个问题，即通过光诱导凝胶化来固定排列的厚胶体晶体。入射光的衰减导致样品内部聚合不足，特别是当样品较厚时。这个问题不能通过简单地加强光照射来解决，这导致凝胶化样品的光学质量恶化，并且仍然是未来的工作。