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Surface Dipole Control of Liquid Crystal Alignment
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SYSNO ASEP 0459923 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Surface Dipole Control of Liquid Crystal Alignment Author(s) Schwartz, J. J. (US)
Mendoza, A.M. (US)
Wattanatorn, N. (US)
Zhao, Y. (US)
Nguyen, V.T. (US)
Spokoyny, A.M. (US)
Mirkin, CH.A. (US)
Baše, Tomáš (UACH-T) RID, SAI, ORCID
Weiss, P. S. (US)Number of authors 9 Source Title Journal of the American Chemical Society. - : American Chemical Society - ISSN 0002-7863
Roč. 138, č. 18 (2016), s. 5957-5967Number of pages 11 s. Language eng - English Country US - United States Keywords Self-assembled monolayers ; Deposited gold-films ; Carboranethiol isomers Subject RIV CA - Inorganic Chemistry Institutional support UACH-T - RVO:61388980 UT WOS 000375889100037 EID SCOPUS 84971231478 DOI 10.1021/jacs.6b02026 Annotation Detailed understanding and control of the intermolecular forces that govern molecular assembly are necessary to engineer structure and function at the nanoscale. Liquid crystal (LC) assembly is exceptionally sensitive to surface properties, capable of transducing nanoscale intermolecular interactions into a macroscopic optical readout. Self-assembled monolayers (SAMs) modify surface interactions and are known to influence LC alignment. Here, we exploit the different dipole magnitudes and orientations of carboranethiol and-dithiol positional isomers to deconvolve the influence of SAM-LC dipolar coupling from variations in molecular geometry, tilt, and order. Director orientations and anchoring energies are measured for LC cells employing various carboranethiol and-dithiol isomer alignment layers. The normal component of the molecular dipole in the SAM, toward or away from the underlying substrate, was found to determine the in-plane LC director orientation relative to the anisotropy axis of the surface. By using LC alignment as a probe of interaction strength, we elucidate the role of dipolar coupling of molecular monolayers to their environment in determining molecular orientations. We apply this understanding to advance the engineering of molecular interactions at the nanoscale. Workplace Institute of Inorganic Chemistry Contact Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Year of Publishing 2017
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