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Title: Highly organized smectic-like packing in vapor-deposited glasses of a liquid crystal

Abstract

Glasses of a model smectic liquid crystal-forming molecule, itraconazole, were prepared by vapor deposition onto substrates with temperatures ranging from T substrate = 0.78T g to 1.02T g, where T g (=330 K) is the glass transition temperature. The films were characterized using X-ray scattering techniques. For T substrate near and below T g, glasses with layered smectic-like structures can be prepared and the layer spacing can be tuned by 16% through the choice of T substrate. Remarkably, glasses prepared with T substrate values above T g exhibit levels of structural organization much higher than that of a thermally annealed film. These results are explained by a mechanism based upon a preferred molecular orientation and enhanced molecular motion at the free surface, indicating that molecular organization in the glass is independent of the anchoring preferred at the substrate. Furthermore, these results suggest new strategies for optimizing molecular packing within active layers of organic electronic and optoelectronic devices.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [2];  [3]; ORCiD logo [2];  [1];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1360956
Grant/Contract Number:
AC02-76SF00515; DMR-1121288; DMR-1234320
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 29; Journal Issue: 2; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Gujral, Ankit, Gomez, Jaritza, Jiang, Jing, Huang, Chengbin, O’Hara, Kathryn A., Toney, Michael F., Chabinyc, Michael L., Yu, Lian, and Ediger, M. D. Highly organized smectic-like packing in vapor-deposited glasses of a liquid crystal. United States: N. p., 2016. Web. doi:10.1021/acs.chemmater.6b04877.
Gujral, Ankit, Gomez, Jaritza, Jiang, Jing, Huang, Chengbin, O’Hara, Kathryn A., Toney, Michael F., Chabinyc, Michael L., Yu, Lian, & Ediger, M. D. Highly organized smectic-like packing in vapor-deposited glasses of a liquid crystal. United States. doi:10.1021/acs.chemmater.6b04877.
Gujral, Ankit, Gomez, Jaritza, Jiang, Jing, Huang, Chengbin, O’Hara, Kathryn A., Toney, Michael F., Chabinyc, Michael L., Yu, Lian, and Ediger, M. D. Mon . "Highly organized smectic-like packing in vapor-deposited glasses of a liquid crystal". United States. doi:10.1021/acs.chemmater.6b04877. https://www.osti.gov/servlets/purl/1360956.
@article{osti_1360956,
title = {Highly organized smectic-like packing in vapor-deposited glasses of a liquid crystal},
author = {Gujral, Ankit and Gomez, Jaritza and Jiang, Jing and Huang, Chengbin and O’Hara, Kathryn A. and Toney, Michael F. and Chabinyc, Michael L. and Yu, Lian and Ediger, M. D.},
abstractNote = {Glasses of a model smectic liquid crystal-forming molecule, itraconazole, were prepared by vapor deposition onto substrates with temperatures ranging from Tsubstrate = 0.78Tg to 1.02Tg, where Tg (=330 K) is the glass transition temperature. The films were characterized using X-ray scattering techniques. For Tsubstrate near and below Tg, glasses with layered smectic-like structures can be prepared and the layer spacing can be tuned by 16% through the choice of Tsubstrate. Remarkably, glasses prepared with Tsubstrate values above Tg exhibit levels of structural organization much higher than that of a thermally annealed film. These results are explained by a mechanism based upon a preferred molecular orientation and enhanced molecular motion at the free surface, indicating that molecular organization in the glass is independent of the anchoring preferred at the substrate. Furthermore, these results suggest new strategies for optimizing molecular packing within active layers of organic electronic and optoelectronic devices.},
doi = {10.1021/acs.chemmater.6b04877},
journal = {Chemistry of Materials},
number = 2,
volume = 29,
place = {United States},
year = {Mon Dec 26 00:00:00 EST 2016},
month = {Mon Dec 26 00:00:00 EST 2016}
}

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