Molecular Structure of Canonical Liquid Crystal Interfaces.

Sadati, Monirosadat; Ramezani-Dakhel, Hadi; Bu, Wei; Sevgen, Emre; Liang, Zhu; Erol, Cem; Rahimi, Mohammad; Taheri Qazvini, Nader; Lin, Binhua; Abbott, Nicholas L; Roux, Benoi T; Schlossman, Mark L; de Pablo, Juan J

Sadati, Monirosadat; Ramezani-Dakhel, Hadi; Bu, Wei; Sevgen, Emre; Liang, Zhu; Erol, Cem; Rahimi, Mohammad; Taheri Qazvini, Nader; Lin, Binhua; Abbott, Nicholas L; Roux, Benoi T; Schlossman, Mark L; de Pablo, Juan J.

Afiliación

Sadati M; Argonne National Laboratory , Argonne, Illinois 60439, United States.
Liang Z; Department of Physics, University of Illinois at Chicago , Chicago, Illinois 60607, United States.
Erol C; Department of Physics, University of Illinois at Chicago , Chicago, Illinois 60607, United States.
Taheri Qazvini N; Argonne National Laboratory , Argonne, Illinois 60439, United States.
Abbott NL; Department of Chemical and Biological Engineering, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States.
Schlossman ML; Department of Physics, University of Illinois at Chicago , Chicago, Illinois 60607, United States.
de Pablo JJ; Argonne National Laboratory , Argonne, Illinois 60439, United States.

J Am Chem Soc ; 139(10): 3841-3850, 2017 03 15.

Article en En | MEDLINE | ID: mdl-28177227

RESUMEN

Numerous applications of liquid crystals rely on control of molecular orientation at an interface. However, little is known about the precise molecular structure of such interfaces. In this work, synchrotron X-ray reflectivity measurements, accompanied by large-scale atomistic molecular dynamics simulations, are used for the first time to reconstruct the air-liquid crystal interface of a nematic material, namely, 4-pentyl-4'-cyanobiphenyl (5CB). The results are compared to those for 4-octyl-4'-cyanobiphenyl (8CB) which, in addition to adopting isotropic and nematic states, can also form a smectic phase. Our findings indicate that the air interface imprints a highly ordered structure into the material; such a local structure then propagates well into the bulk of the liquid crystal, particularly for nematic and smectic phases.

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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Am Chem Soc Año: 2017 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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