期刊
SOFT MATTER
卷 15, 期 16, 页码 3283-3290出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8sm02338g
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资金
- U.S. National Science Foundation (NSF) [DMR-1506018, DMR 1307674]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- NSF REU [CHE-1659571]
The effect of the molecular chirality of chiral additives on the nanostructure of the twist-bend nematic (N-TB) liquid crystal phase with ambidextrous chirality and nanoscale pitch due to spontaneous symmetry breaking is studied. It is found that the ambidextrous nanoscale pitch of the N-TB phase increases by 50% due to 3% chiral additive, and the chiral transfer among the biphenyl groups disappears in the N-TB* phase. Most significantly, a twist-grain boundary (TGB) type phase is found at c > 1.5 wt% chiral additive concentrations below the usual N* phase and above the non-CD active N-TB* phase. In such a TGB type phase, the adjacent blocks of pseudo-layers of the nanoscale pitch rotate across the grain boundaries.
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