single gyroid phase as well as the alternating double network gyroid, composed of two alternating single gyroid networks, hold a significant place in ordered nanoscale morphologies for their potential applications as photonic crystals, metamaterials and templates for porous ceramics and metals. Here, we report the first alternating network cubic liquid crystals. They form through self‐assembly of X‐shaped
X-Shaped ternary five-block molecules, composed of a rigid p-terphenyl core, two terminal glycerol groups and two flexible n-alkyl or semiperfluorinated chains fixed laterally to opposite sides of the terphenyl moiety, form liquid crystalline phases built up of honeycomb-like arrays of polygonal cylinders, where the rod-like aromatic cores form cylinder walls with a thickness equal to the width of a single molecule.
X 型三元五嵌段分子由一个刚性对三联苯内核、两个末端甘油基团和两个横向固定在对三联苯相对侧的柔性正烷基或半氟化链组成,形成由蜂窝状多角形圆柱阵列构成的液晶相,其中棒状芳香族内核形成的圆柱壁厚度等于单个分子的宽度。
Synthesis of Hexa-peri-hexobenzocoronenes Carrying Linear or Branched Perfluoroalkylated Side Chains
Substituted disc-shaped perfluoroalkylated hexa-peri-hexabenzocoronenes (HBC), known to self-assemble into conducting ordered architectures, were synthesized and characterized. A systematic variation of the linear or branched perfluoroalkylated side chains was performed in order to screen the influence of the lateral chain on their one-dimensional self-aggregation.
Synthesis and Mesogenic Property of New Bent-Core Molecules with Semifluorinated Alkanes
作者:E-Joon Choi、Hoo-Sik Sim、Liang-Chy Chien、Soo-Min Lee
DOI:10.5012/bkcs.2011.32.2.725
日期:2011.2.20
Adsorption of Gemini Surfactants with Partially Fluorinated Chains at Three Different Surfaces: Neutron Reflectometry Results
作者:Pei Xun Li、Chu Chuan Dong、Robert K. Thomas、Yi Lin Wang
DOI:10.1021/la104291w
日期:2011.1.18
The adsorption of six symmetrical cationic (dimethylammonium bromide) gemini surfactants with four different partially fluorinated chains at three different surfaces-the air/water, the hydrophilic silica/water, and the hydrophobic (octadecyltricholorosilane (OTS))/water-has been investigated by neutron reflectometry. The corresponding single chain trimethylammonium bromides have also been studied at the two solid surfaces. Four of the geminis with a C-6 spacer and chains with differing amounts of fluorocarbon have identical limiting areas per molecule at the air/water interface (106 +/- 5 angstrom(2)). This is similar to the value for the corresponding hydrocarbon gemini with a C-6 spacer and C-12 side chains, but unlike the hydrocarbon gemini, it is significantly more than twice the area per molecule of the corresponding single chain cationic. In adsorbed aggregates on hydrophilic silica the area per molecule decreases from the air/water value by an average of about 25%, indicating a substantial improvement in the packing of these geminis in the aggregate, which can be attributed to the stronger interaction between the hydrophobic chains in the interior of the aggregates. On the hydrophobic OTS surface the area per molecule in the adsorbed monolayer for three partially fluorinated geminis decreased by about 15% from the air/water value, again indicating much more favorable packing next to the hydrophobic OTS, but for one of the geminis, fC(8)C(6)-C-6-C(6)fC(8), the change in area was reversed. This reversal is accompanied by a marked thinning of the layer, which is attributed to a shift in the balance between the interactions of the hydrocarbon spacer and fluorocarbon chain fragments and the OTS surface.