Immobilization of polymer-decorated liquid crystal droplets on chemically tailored surfaces.
Immobilization of polymer-decorated liquid crystal droplets on chemically tailored surfaces.
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DOI：
10.1021/la100376u
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发表时间：
2010-06-15
期刊：
影响因子：
--
通讯作者：
Lynn DM
中科院分区：
文献类型：
--
作者：
Kinsinger MI;Buck ME;Abbott NL;Lynn DM
我们证明，在分散在水溶液中的微米级热致液晶(LC)液滴的界面上组装两亲性多胺可以促进LC液滴在化学功能化表面的固定。聚合物1设计为同时含有疏水性(烷基官能化)和亲水性(伯胺和叔胺官能化)侧链官能团。这种聚合物在液滴水分散界面上的组装是通过从水溶液中自发吸附聚合物来实现的。通过偏振光和明场显微镜观察，聚合物吸附引发了液晶取向有序性的转变。我们证明，这些液滴界面上聚合物1的存在可以通过共价键的形成(例如，对于涂有反应性氮内酯官能团的聚合物多层膜的表面)或通过静电相互作用(例如，对于涂有含有水解氮内酯官能团的多层膜的表面)，将液滴固定在平面固体表面上。通过偏振、荧光和激光扫描共聚焦显微镜对固定化液滴的表征表明，聚合物涂层液滴在固定化后保持一般的球形，并且固定化导致液滴内发生额外的有序化转变，这取决于液滴所接触的表面的性质。经聚乙二亚胺(PEI)处理的聚合物多层膜不能固定聚合物1官能化液滴。我们证明，设计表面促进或阻止聚合物功能化液滴固定的能力可以被用来在表面上固定液滴。这项研究的结果提供了一种方法的基础，该方法可用于定制分散LC乳液的性质，并在广泛的基本和应用环境中将这些液滴固定在感兴趣的功能表面上。
We demonstrate that the assembly of an amphiphilic polyamine on the interfaces of micrometer-sized droplets of a thermotropic liquid crystal (LC) dispersed in aqueous solutions can be used to facilitate the immobilization of LC droplets on chemically functionalized surfaces. Polymer 1 was designed to contain both hydrophobic (alkyl-functionalized) and hydrophilic (primary and tertiary amine-functionalized) side chain functionality. The assembly of this polymer at the interfaces of aqueous dispersions of LC droplets was achieved by spontaneous adsorption of polymer from aqueous solution. Polymer adsorption triggered transitions in the orientational ordering of the LCs, as observed by polarized light and bright-field microscopy. We demonstrate that the presence of polymer 1 on the interfaces of these droplets can be exploited to immobilize LC droplets on planar solid surfaces through covalent bond formation (e.g., for surfaces coated with polymer multilayers containing reactive azlactone functionality) or through electrostatic interactions (e.g., for surfaces coated with multilayers containing hydrolyzed azlactone functionality). Characterization of immobilized LC droplets by polarized, fluorescence, and laser scanning confocal microscopy revealed the general spherical shape of the polymer-coated LC droplets to be maintained after immobilization, and that immobilization led to additional ordering transitions within the droplets that was dependent on the nature of the surfaces with which they were in contact. Polymer 1-functionalized LC droplets were not immobilized on polymer multilayers treated with poly(ethylene imine) (PEI). We demonstrate that the ability to design surfaces that promote or prevent the immobilization of polymer-functionalized LC droplets can exploited to pattern the immobilization of LC droplets on surfaces. The results of this investigation provide the basis of an approach that could be used to tailor the properties of dispersed LC emulsions and to immobilize these droplets on functional surfaces of interest in a broad range of fundamental and applied contexts.
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影响因子：
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作者：
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