Switching in Orientation of Macromolecular Helical Rod Silicon on the Solid Surfaces
Switching in Orientation of Macromolecular Helical Rod Silicon on the Solid Surfaces
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DOI：
10.1021/ma062019d
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发表时间：
2007-02
期刊：
影响因子：
5.5
通讯作者：
M. Naito;Naho Saeki;M. Fujiki;A. Ohira
中科院分区：
文献类型：
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作者：
M. Naito;Naho Saeki;M. Fujiki;A. Ohira
本文报道了具有Si−H末端的棒状和无规卷曲的聚二烷基硅烷S在HO存在的衬底上的自有序行为。利用石英晶体微天平、镜面反射紫外光谱和原子力显微镜研究了二烷基硅烷S及其衬底的刚性和分子长度的影响。将HO存在的底物简单地浸泡在聚正十二烷基异丁基硅烷(PDBS)/异辛烷中，就可以操纵从水平取向到几乎垂直于底物方向的协同结构相变。此外，垂直自组装PDBS的取向行为依赖于其相对分子质量。另一方面，聚甲基正丙基硅烷的无规卷曲只能水平固定，导致在HO存在的底物上形成蘑菇状结构。从这些研究中获得的知识可能会导致一种新的、简单的方法，旨在制造垂直和/或水平的自适应能力。
The present paper reports the self-ordering behavior of rod-like and random-coiled poly(dialkylsilane)s with Si−H termini on HO-presented substrates. The effects of stiffness and molecular length of poly(dialkylsilane)s and substrates were investigated by a combination of quartz crystal microbalance, specular reflectance UV spectroscopy, and atomic force microscopy. A simple immersion of the HO-presented substrates into poly(n-decylisobutylsilane) (PDBS)/isooctane enabled the manipulation of cooperative structural phase transition from horizontal to almost vertical orientation to the substrate. Furthermore, the orientation behavior of vertically self-assembled PDBS depended on its molecular weight. On the other hand, a random-coiled poly(methyl-n-propylsilane) was only horizontally immobilized, resulting in the formation of a mushroom-like structure on HO-presented substrates. Knowledge gained from these studies may lead to a new, simple approach designed to fabricate vertically and/or horizontally self-a...