Lugger Jody A M, Mulder Dirk J, Bhattacharjee Subham, Sijbesma Rint P
Institute for Complex Molecular Systems , Eindhoven University of Technology , P.O. Box 513, Eindhoven , Netherlands 5600 MB.
Laboratory of Supramolecular Polymer Chemistry, Department of Chemical Engineering and Chemistry , Eindhoven University of Technology , P.O. Box 513, Eindhoven , Netherlands 5600 MB.
ACS Nano. 2018 Jul 24;12(7):6714-6724. doi: 10.1021/acsnano.8b01822. Epub 2018 Jul 10.
Nanostructured polymer films with continuous, membrane-spanning pores from polymerizable hexagonal columnar discotic liquid crystals (LCs) were fabricated. A robust alignment method was developed to obtain homeotropic alignment of columns between glass surfaces by adding a small amount of a tri(ethylene glycol) modified analogue of the mesogen as a dopant that preferentially wets glass. The homeotropic LC alignment was fixated via a photoinitiated free radical copolymerization of a high-temperature tolerant trisallyl mesogen with a divinyl ester. Removal of the hydrogen-bonded template from the aligned columns afforded a nanoporous network with pores of nearly 1 nm in diameter perpendicular to the surface, and without noticeable collapse of the nanopores. The effect of pore orientation was demonstrated by an adsorption experiment in which homeotropic film showed a threefold increase in the initial uptake rate of methylene blue compared to planarly aligned films.
制备了具有连续的、跨膜孔的纳米结构聚合物薄膜，这些孔来自可聚合的六方柱状盘状液晶（LCs）。开发了一种稳健的取向方法，通过添加少量作为掺杂剂的介晶三（乙二醇）改性类似物来获得玻璃表面之间柱状体的垂直取向，该掺杂剂优先润湿玻璃。通过高温耐受的三烯丙基介晶与二乙烯基酯的光引发自由基共聚来固定垂直的LC取向。从取向的柱状体中去除氢键模板得到了纳米多孔网络，其垂直于表面的孔径接近1nm，且纳米孔没有明显塌陷。通过吸附实验证明了孔取向的影响，其中垂直取向的薄膜与平面取向的薄膜相比，亚甲基蓝的初始摄取速率提高了三倍。
