Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3420-3424Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00760
Keywords
helical pitch; helix; Smectic liquid crystal; resonant soft X-ray scattering; carbon edge; nanofilament; B4; bent-core
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Funding
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-AC02-05CH11231]
- Liquid Crystal Materials Research Center (NSF MRSEC) [DMR-0820579, DMR-1420736]
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We report the first in situ measurement of the helical pitch of the helical nanofilament B4 phase of bent-core liquid crystals using linearly polarized, resonant soft X-ray scattering at the carbon K-edge. A strong, anisotropic scattering peak corresponding to the half-pitch of the twisted smectic layer structure was observed. The equilibrium helical half-pitch of NOBOW is found to be 120 nm, essentially independent of temperature. However, the helical pitch can be tuned by mixing guest organic molecules with the bent-core host, followed by thermal annealing.
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