Understanding and Manipulating Helical Nanofilaments in Binary Systems with Achiral Dopants

Cao, Yu; Tan, Tianyi; Walba, David M.; Clark, Noel A.; Ungar, Goran; Zhu, Chenhui; Zhang, Lei; Liu, Feng

doi:10.1021/acs.nanolett.2c01525

Title: Understanding and Manipulating Helical Nanofilaments in Binary Systems with Achiral Dopants

Journal Article · 18 May 2022 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.2c01525 · OSTI ID:1963447

^[1]; Tan, Tianyi ^[2]; Walba, David M. ^[3]; Clark, Noel A. ^[3];

^[2]; Zhu, Chenhui ^[4];

^[2];

^[2]

Xi'an Jiaotong Univ. (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Xi'an Jiaotong Univ. (China)
Univ. of Colorado, Boulder, CO (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Here, in this paper, we report the relationship between helical pitch of the helical nanofilament (HNF) phase formed by bent-core molecule NOBOW and the concentration of achiral dopants 5CB and octane, using linearly polarized resonant soft X-ray scattering (RSoXS). Utilizing theory-based simulation, which fits well with the experiments, the molecular helices in the filament were probed and the superstructure of helical 5CB directed by groove of HNFs was observed. Quantitative pitch determination with RSoXS reveals that helical pitch variation is related to 5CB concentration with no temperature dependence. Doping rodlike immiscible 5CB led to a pitch shortening of up to 30%, which was attributed to a change in interfacial tension. By shedding light not only on phase behavior of binary systems but also enabling control over pitch length, our work may benefit various applications of HNF-containing binary systems, including optical rotation devices, circularly polarized light emitters, and chirality transfer agents.

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

Sponsoring Organization:: China Scholarship Council (CSC); National Natural Science Foundation of China (NSFC); Science and Technology Agency of Shaanxi Province; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1963447

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 11 Vol. 22; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Understanding and Manipulating Helical Nanofilaments in Binary Systems with Achiral Dopants

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