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Vapor deposition of a nonmesogen prepares highly structured organic glasses.

ABSTRACT: We show that glasses with aligned smectic liquid crystal-like order can be produced by physical vapor deposition of a molecule without any equilibrium liquid crystal phases. Smectic-like order in vapor-deposited films was characterized by wide-angle X-ray scattering. A surface equilibration mechanism predicts the highly smectic-like vapor-deposited structure to be a result of significant vertical anchoring at the surface of the equilibrium liquid, and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy orientation analysis confirms this prediction. Understanding of the mechanism enables informed engineering of different levels of smectic order in vapor-deposited glasses to suit various applications. The preparation of a glass with orientational and translational order from a nonliquid crystal opens up an exciting paradigm for accessing extreme anisotropy in glassy solids.

SUBMITTER: Bishop C

PROVIDER: S-EPMC6815165 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature

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Vapor deposition of a nonmesogen prepares highly structured organic glasses.

Bishop Camille C Thelen Jacob L JL Gann Eliot E Toney Michael F MF Yu Lian L DeLongchamp Dean M DM Ediger M D MD

Proceedings of the National Academy of Sciences of the United States of America 20190916 43

We show that glasses with aligned smectic liquid crystal-like order can be produced by physical vapor deposition of a molecule without any equilibrium liquid crystal phases. Smectic-like order in vapor-deposited films was characterized by wide-angle X-ray scattering. A surface equilibration mechanism predicts the highly smectic-like vapor-deposited structure to be a result of significant vertical anchoring at the surface of the equilibrium liquid, and near-edge X-ray absorption fine structure (N ...[more]

PMID: 31527259

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