Institute for Physical Chemistry, Bulgarian Academia of Sciences , 1113 Sofia, Bulgaria.
Institut für Physik, Johannes Gutenberg Universität Mainz , 55099 Mainz, Germany.
Nano Lett. 2017 Aug 9;17(8):4924-4928. doi: 10.1021/acs.nanolett.7b01948. Epub 2017 Jul 11.
Molecular dynamics simulations of semiflexible polymers in a good solvent reveal a dense adsorbed layer when the solution is exposed to an attractive planar wall. This layer exhibits both a nematic and a smectic phase (smA for short and smC for longer chains) with bond vectors aligned strictly parallel to the wall. The tilt angle of the smC phase increases strongly with the contour length of the polymers. The isotropic-nematic transition is a Kosterlitz-Thouless transition and also the nematic-smectic transition is continuous. Our finding demonstrates thus a two-dimensional realization of different liquid crystalline phases, ubiquitous in three dimensions, that occurs in a single monomolecular layer ordered at least over mesoscopic scales.
在良溶剂中，对处于有吸引力的平面壁的溶液中的半刚性聚合物进行分子动力学模拟，发现当溶液暴露于有吸引力的平面壁时，会出现致密的吸附层。该层表现出向列相和近晶相（长链的 smC），其键矢量严格平行于壁排列。smC 相的倾斜角随聚合物的轮廓长度强烈增加。各向同性-向列相转变是科斯特利茨-图尔苏斯转变，向列相-近晶相转变也是连续的。因此，我们的发现证明了在单个单分子层中至少在介观尺度上有序的二维实现了在三维中普遍存在的不同液晶相。
