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

Gujral, Ankit; Gomez, Jaritza; Jiang, Jing; Huang, Chengbin; O’Hara, Kathryn A.; Toney, Michael F.; Chabinyc, Michael L.; Yu, Lian; Ediger, M. D.

doi:10.1021/acs.chemmater.6b04877

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

Journal Article · Mon Dec 26 00:00:00 EST 2016 · Chemistry of Materials

DOI:https://doi.org/10.1021/acs.chemmater.6b04877· OSTI ID:1360956

^[1]; Gomez, Jaritza ^[1]; Jiang, Jing ^[1]; ^[1]; O’Hara, Kathryn A. ^[2]; Toney, Michael F. ^[3]; ^[2]; Yu, Lian ^[1]; Ediger, M. D. ^[1]

Univ. of Wisconsin, Madison, WI (United States)
Univ. of California, Santa Barbara, CA (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Lab. (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1360956

Journal Information:: Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 2 Vol. 29; ISSN 0897-4756

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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