Suspensions of silica particles grafted with concentrated polymer brush: A new family of colloidal crystals
Suspensions of silica particles grafted with concentrated polymer brush: A new family of colloidal crystals
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DOI：
10.1021/ma0521708
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发表时间：
2006-02-07
期刊：
影响因子：
5.5
通讯作者：
Fukuda, T
中科院分区：
文献类型：
--
作者：
Ohno, K;Morinaga, T;Fukuda, T
最近发现了一种胶体晶体，用于杂化颗粒的液体悬浮液，该杂化颗粒具有球形的二氧化硅核心和定义明确的聚甲基丙烯酸甲酯“浓刷”的外壳。随着颗粒浓度的增加，悬浮液从(无序)流体发展到完全结晶的体系，经历了狭窄的晶体/流体共存区域。该晶体具有面心立方结构，具有惊人的大的最近邻粒子间距，这表明由于“集中刷子效应”而高度延伸的接枝链，施加了长程空间相互作用。这种类型的胶体晶体在长程粒间势的起源和许多系统参数的可控性方面是新的。
A colloidal crystal was newly identified for a liquid suspension of the hybrid particles having a spherical silica core and a shell of well-defined poly(methyl methacrylate) "concentrated brush". With increasing particle concentration, the suspension progressed from a (disordered) fluid to a fully crystallized system, going through a narrow crystal/fluid coexisting regime. The crystal had a face-centered cubic structure with a surprisingly large nearest-neighbor interparticle distance, suggesting that the graft chains, highly extended due to the "concentrated brush effect", exerted a long-range steric interaction. This type of colloidal crystal is new with respect to the origin of long-range interparticle potential and the controllability of many of the system parameters.