The adsorption of fluorinated dopants at the surface of 5CB: a neutron reflection study

The adsorption of fluorinated dopants at the surface of 5CB: a neutron reflection study
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氟化掺杂剂在 5CB 表面的吸附:中子反射研究

DOI:
10.1080/02678292.2014.986769
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发表时间:
2015
期刊:
影响因子:
2.2
通讯作者:
Mears L
Mears L
中科院分区:
化学3区
文献类型:
--
作者:
Mears L

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利用中子反射研究了 5CB 表面掺杂剂的吸附。掺杂剂是具有部分氟化链的 11OCB 版本,5CB 与空气或经过碳氟化合物或碳氢化合物涂层处理的二氧化硅相连接。在空气界面处,F17-11OCB 垂直吸附,并且冷却到 5CB 向列相时吸附量增加。在低温下,向列相的吸附似乎在双层处饱和。在固体界面处,有一些证据表明表面存在薄的平面层,但大多数吸附的掺杂剂呈扩散层的形式。在这两种情况下,掺杂剂浓度的增加都会导致吸附量增加。对于 F17-11OCB,氟化涂层的吸收量比碳氢化合物涂层表面的吸收量要大得多。也没有检测到 F3-11OCB 的吸附,这表明吸附过程是由疏油效应驱动的。结果表明,使用类表面活性剂掺杂剂来控制液晶的表面性质是可能的。
The adsorption of dopants at the surface of 5CB has been studied using neutron reflection. The dopants were versions of 11OCB with partly fluorinated chains, and the 5CB was interfaced with air or with silica treated with fluorocarbon or hydrocarbon coatings. At the air interface, the F17-11OCB adsorbed homeotropically, and the amount increased on cooling into the nematic phase of 5CB. At low temperatures, the adsorption from the nematic phase appeared to saturate at a bilayer. At the solid interfaces, there was some evidence for a thin planar layer at the surface, but most of the adsorbed dopant was in the form of diffuse layers. In both cases, an increase in dopant concentration caused higher adsorbed amounts. For F17-11OCB, the amount absorbed was much greater for a fluorinated coating as opposed to a hydrocarbon-coated surface. Also no adsorption of the F3-11OCB could be detected, suggesting that the adsorption process is driven by the oleophobic effect. The results demonstrate that it is possible to manipulate surface properties of liquid crystals using surfactant-like dopants.
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