Heliconical smectic phases formed by achiral molecules

Abberley, Jordan P.; Killah, Ross; Walker, Rebecca; Storey, John M.  D.; Imrie, Corrie T.; Salamo?czyk, Miros?aw; Zhu, Chenhui; Gorecka, Ewa; Pociecha, Damian

doi:10.1038/s41467-017-02626-6

Heliconical smectic phases formed by achiral molecules

Journal Article · Mon Jan 15 00:00:00 EST 2018 · Nature Communications

DOI:https://doi.org/10.1038/s41467-017-02626-6· OSTI ID:1433133

Abberley, Jordan P. ^[1]; Killah, Ross ^[1]; Walker, Rebecca ^[1]; Storey, John M. D. ^[1]; Imrie, Corrie T. ^[1]; ^[2]; Zhu, Chenhui ^[3]; Gorecka, Ewa ^[4]; Pociecha, Damian ^[4]

Univ. of Aberdeen, King's College, Aberdeen, Scotland (United Kingdom)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Kent State Univ., Kent, OH (United States). Dept. of Physics and Liquid Crystal Inst.
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of Warsaw (Poland). Faculty of Chemistry

Chiral symmetry breaking in soft matter is a hot topic of current research. Recently, such a phenomenon was found in a fluidic phase showing orientational order of molecules - the nematic phase; although built of achiral molecules, the phase can exhibit structural chirality - average molecular direction follows a short-pitch helix. Here in this paper, we report a series of achiral asymmetric dimers with an odd number of atoms in the spacer, which form twisted structures in nematic as well as in lamellar phases. The tight pitch heliconical nematic (N_TB) phase and heliconical tilted smectic C (SmC_TB) phase are formed. The formation of a variety of helical structures is accompanied by a gradual freezing of molecular rotation. In the lowest temperature smectic phase, HexI, the twist is expressed through the formation of hierarchical structure: nanoscale helices and mesoscopic helical filaments. The short-pitch helical structure in the smectic phases is confirmed by resonant X-ray measurements.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1433133

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Schiff base/ester liquid crystals with different lateral substituents: mesophase behaviour and DFT calculations Ahmed, H. A.; Hagar, M.; El-Sayed, T. H. Taylor & Francis https://doi.org/10.6084/m9.figshare.7792124.v1	text	January 2019
Isoflavone-based trimer liquid crystals: synthesis, characterization, thermal and mesomorphic properties evaluations Mohammad, Abdulkarim-Talaq; Srinivasa H., T.; Alrawi, Rusul Yousif Taylor & Francis https://doi.org/10.6084/m9.figshare.8273657	text	January 2019
Symmetrical and asymmetrical liquid crystal dimers: synthesis, characterisation and mesomorphic behaviour Al-Hamdani, Uhood Jabbar; Abbo, Hanna S.; Shaheeb, Ebtahal Hamid Taylor & Francis https://doi.org/10.6084/m9.figshare.8304653	text	January 2019
Symmetrical and asymmetrical liquid crystal dimers: synthesis, characterisation and mesomorphic behaviour Al-Hamdani, Uhood Jabbar; Abbo, Hanna S.; Shaheeb, Ebtahal Hamid Taylor & Francis https://doi.org/10.6084/m9.figshare.8304653.v1	text	January 2019
Sulfur-linked cyanobiphenyl-based liquid crystal dimers and the twist-bend nematic phase Cruickshank, Ewan; Salamończyk, Mirosław; Pociecha, Damian Taylor & Francis https://doi.org/10.6084/m9.figshare.9210365	text	January 2019
Sulfur-linked cyanobiphenyl-based liquid crystal dimers and the twist-bend nematic phase Cruickshank, Ewan; Salamończyk, Mirosław; Pociecha, Damian Taylor & Francis https://doi.org/10.6084/m9.figshare.9210365.v1	text	January 2019
Structure-property relationships in azobenzene-based twist-bend nematogens Abberley, Jordan P.; Storey, John M. D.; Imrie, Corrie T. Taylor & Francis https://doi.org/10.6084/m9.figshare.9777557.v1	text	January 2019
Liquid crystal dimers containing Cholesteryl and Triazole-containing mesogenic units Al-Shargabi, Arwa; Yeap, Guan-Yeow; Mahmood, Wan Ahmad Kamil Taylor & Francis https://doi.org/10.6084/m9.figshare.9884018.v1	text	January 2019

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