期刊
ACS NANO
卷 12, 期 7, 页码 6714-6724出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b01822
关键词
liquid crystals; nanoporous membranes; adsorption; polymer network; homeotropic alignment
类别
资金
- Ministry of Education, Culture and Science of The Netherlands [024.001.035]
- Netherlands Organisation for Scientific Research (NWO) [729.002.003]
- research program of the Dutch Polymer Institute (DPI) [776]
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.
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