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

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.

doi:10.1039/c8sm02338g

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

Journal Article · Fri Mar 22 00:00:00 EDT 2019 · Soft Matter

DOI:https://doi.org/10.1039/c8sm02338g· OSTI ID:1580828

Murachver, Matthew T. ^[1]; Nemati, Ahlam ^[1]; ^[1]; Bullock, Carson ^[2]; Sabata, Zachary ^[3]; Rahmani, Haumed ^[1]; Vorobiova, Tetiana ^[1]; Izadnegahdar, Alain ^[4]; Salili, Seyyed Muhammad ^[5]; ^[6]; Zhu, Chenhui ^[6]; ^[1]; Sprunt, Samuel N. ^[1]; Gleeson, James T. ^[1]; ^[1]

Kent State Univ., Kent, OH (United States)
Kent State Univ., Kent, OH (United States); College of Wooster, OH (United States)
Kent State Univ., Kent, OH (United States); Univ. of Nebraska, Omaha, NE (United States)
Advanced Precision Systems, Inc., Chagrin Falls, OH (United States)
Kent State Univ., Kent, OH (United States); Univ. of Pennsylvania, Philadelphia, PA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1580828

Journal Information:: Soft Matter, Journal Name: Soft Matter Journal Issue: 16 Vol. 15; ISSN SMOABF; ISSN 1744-683X

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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