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Title: Indication of a twist-grain-boundary-twist-bend phase of flexible core bent-shape chiral dimers

Abstract

The consequence 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 observed 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.

Authors:
 [1];  [1]; ORCiD logo [1];  [2];  [3];  [1];  [1];  [4];  [5]; ORCiD logo [6];  [6]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]
  1. Kent State Univ., Kent, OH (United States)
  2. Kent State Univ., Kent, OH (United States); College of Wooster, OH (United States)
  3. Kent State Univ., Kent, OH (United States); Univ. of Nebraska, Omaha, NE (United States)
  4. Advanced Precision Systems, Inc., Chagrin Falls, OH (United States)
  5. Kent State Univ., Kent, OH (United States); Univ. of Pennsylvania, Philadelphia, PA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1580828
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Soft Matter
Additional Journal Information:
Journal Volume: 15; Journal Issue: 16; Journal ID: ISSN 1744-683X
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats

Murachver, Matthew T., Nemati, Ahlam, Salamończyk, Mirosław, Bullock, Carson, Sabata, Zachary, Rahmani, Haumed, Vorobiova, Tetiana, Izadnegahdar, Alain, Salili, Seyyed Muhammad, Norman, Victoria, Zhu, Chenhui, Hegmann, Torsten, Sprunt, Samuel N., Gleeson, James T., and Jakli, Antal I. Indication of a twist-grain-boundary-twist-bend phase of flexible core bent-shape chiral dimers. United States: N. p., 2019. Web. doi:10.1039/c8sm02338g.
Murachver, Matthew T., Nemati, Ahlam, Salamończyk, Mirosław, Bullock, Carson, Sabata, Zachary, Rahmani, Haumed, Vorobiova, Tetiana, Izadnegahdar, Alain, Salili, Seyyed Muhammad, Norman, Victoria, Zhu, Chenhui, Hegmann, Torsten, Sprunt, Samuel N., Gleeson, James T., & Jakli, Antal I. Indication of a twist-grain-boundary-twist-bend phase of flexible core bent-shape chiral dimers. United States. doi:10.1039/c8sm02338g.
Murachver, Matthew T., Nemati, Ahlam, Salamończyk, Mirosław, Bullock, Carson, Sabata, Zachary, Rahmani, Haumed, Vorobiova, Tetiana, Izadnegahdar, Alain, Salili, Seyyed Muhammad, Norman, Victoria, Zhu, Chenhui, Hegmann, Torsten, Sprunt, Samuel N., Gleeson, James T., and Jakli, Antal I. Fri . "Indication of a twist-grain-boundary-twist-bend phase of flexible core bent-shape chiral dimers". United States. doi:10.1039/c8sm02338g.
@article{osti_1580828,
title = {Indication of a twist-grain-boundary-twist-bend phase of flexible core bent-shape chiral dimers},
author = {Murachver, Matthew T. and Nemati, Ahlam and Salamończyk, Mirosław and Bullock, Carson and Sabata, Zachary and Rahmani, Haumed and Vorobiova, Tetiana and Izadnegahdar, Alain and Salili, Seyyed Muhammad and Norman, Victoria and Zhu, Chenhui and Hegmann, Torsten and Sprunt, Samuel N. and Gleeson, James T. and Jakli, Antal I.},
abstractNote = {The consequence of the molecular chirality of chiral additives on the nanostructure of the twist-bend nematic (NTB) liquid crystal phase with ambidextrous chirality and nanoscale pitch due to spontaneous symmetry breaking is studied. It is observed that the ambidextrous nanoscale pitch of the NTB phase increases by 50% due to 3% chiral additive, and the chiral transfer among the biphenyl groups disappears in the NTB* 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 NTB* phase. In such a TGB type phase, the adjacent blocks of pseudo-layers of the nanoscale pitch rotate across the grain boundaries.},
doi = {10.1039/c8sm02338g},
journal = {Soft Matter},
number = 16,
volume = 15,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
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