Diverse configurations of columnar liquid crystals in cylindrical   nano-and micropores

doi:10.1039/c7sm00620a

CORC > 北京大学 > 化学与分子工程学院

	Diverse configurations of columnar liquid crystals in cylindrical nano-and micropores
	Zhang, Rui-bin ; Ungar, Goran ; Zeng, Xiangbing ; Shen, Zhihao
刊名	SOFT MATTER
	2017
关键词	POROUS ALUMINA NANOCHANNELS CONFINEMENT ARRAYS CHAINS
DOI	10.1039/c7sm00620a
英文摘要	Using 2D X-ray diffraction and AFM we studied the configuration, in cylindrical confinement, of hexagonal columnar phases that anchor homeotropically, i.e. with the columns normal to the pore wall. A wide range of pore diameters, from 20 nm to 100 mu m, were explored by employing anodic alumina membranes and glass capillaries. The compounds used were a small discotic, hexakis( hexyloxy) triphenylene (HAT6), a large discotic hexa-peri-hexabenzocoronene (HBC), and a T-shaped bolaamphiphile, forming a honeycomb-type columnar phase. It was found that in pores up to tens of mm in diameter the columns adopt the "logpile'' configuration with parallel columns crossing the pore perpendicular to its axis. Starting with 20 nm pores, with increasing pore diameter up to 5 different configurations are observed, the sequence being the same for all three compounds in spite of their structural diversity. One of the {100} planes of the hexagonal logpile starts from being parallel to the pore axis, then rotates by 90 degrees as the pore size increases, and eventually becomes tilted to the pore axis by (8.5 +/- 1)degrees as the pore widens further. Finally, in glass capillaries of tens of mu m and beyond, the columns become axially oriented, parallel to the capillary axis. This latter finding was particularly unexpected as common sense would suggest axial columns to be favoured by planar anchoring, where in fact, it was shown to be hard to achieve. The present findings should help in the design of low-dimensional semiconductor or ionic conductor devices based on oriented columnar phases.; NSF-EPSRC [EP-K034308]; 1000 Talents Program of P. R. China; SCI(E); ARTICLE; 22; 4122-4131; 13
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/472800]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Zhang, Rui-bin,Ungar, Goran,Zeng, Xiangbing,et al. Diverse configurations of columnar liquid crystals in cylindrical nano-and micropores[J]. SOFT MATTER,2017.
APA	Zhang, Rui-bin,Ungar, Goran,Zeng, Xiangbing,&Shen, Zhihao.(2017).Diverse configurations of columnar liquid crystals in cylindrical nano-and micropores.SOFT MATTER.
MLA	Zhang, Rui-bin,et al."Diverse configurations of columnar liquid crystals in cylindrical nano-and micropores".SOFT MATTER (2017).