Vapor-Deposited Glasses with Long-Range Columnar Liquid Crystalline Order

Dataset · Wed Oct 04 04:00:00 EDT 2017

DOI:https://doi.org/10.11578/1413970· OSTI ID:1413970

Gujral, Ankit ^[1]; Gomez, Jaritza ^[2]; Ruan, Shigang ^[2]; Toney, Michael F. ^[3]; Bock, Harold ^[4]; Yu, Lian ^[5]; Ediger, Mark D. ^[6]

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1. Department of Chemistry, Unversity of Wisconsin-Madison, Madison, Wisconsin, 53706, United States; Department of Chemistry, University of Wisconsin-Madison
2. Department of Chemistry, Unversity of Wisconsin-Madison, Madison, Wisconsin, 53706, United States
3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
4. Centre de Recherche Paul Pascal, Universite de Bordeaux & CNRS, 33600 Pessac, France
5. School of Pharmacy, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States
6. Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin, 53706, United States

Anisotropic molecular packing, particularly in highly ordered liquid crystalline arrangements, has the potential for optimizing performance in organic electronic and optoelectronic applications. Here we show that physical vapor deposition can be used to prepare highly organized glassy solids of discotic liquid crystalline systems. Using grazing incidence X-ray scattering, atomic force microscopy, and UV–vis spectroscopy, we compare three systems: a rectangular columnar liquid crystal, a hexagonal columnar liquid crystal, and a nonmesogen. The packing motifs accessible by vapor deposition are highly organized for the liquid crystalline systems with columns propagating either in plane or out-of-plane depending upon the substrate temperature during deposition. The structures formed at a given substrate temperature can be understood as resulting from partial equilibration toward the structure of the equilibrium liquid crystal surface during the deposition process.

• Research Organization: University of Wisconsin-Madison; Albany Research Center (ARC), Albany, OR (United States); [Select Primary First]
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
• Contributing Organization: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States; Centre de Recherche Paul Pascal, Université de Bordeaux & CNRS, 33600 Pessac, France; School of Pharmacy, University of Wisconsin—Madison, Madison, Wisconsin 53706, United States
• DOE Contract Number: SC0002161
• OSTI ID: 1413970
• Report Number(s): 1793-77681
• Country of Publication: United States
• Language: English