Journal ArticleDOI
Liquid crystal alignment on carbonaceous surfaces with orientational order.
Joachim Stöhr,Mahesh G. Samant,Jan Lüning,Alessandro C. Callegari,P. Chaudhari,James P. Doyle,James A. Lacey,Shui-Chin Alan Lien,Sampath Purushothaman,J. L. Speidell +9 more
TLDR
This work uses near-edge x-ray absorption fine structure (NEXAFS) spectroscopy to link the orientational bond order at three carbonaceous surfaces with the direction of liquid crystal (LC) alignment on these surfaces, showing that LC alignment can be created on any carbonaceous substrate by inducing orientational order at its surface.Abstract:
We used near-edge x-ray absorption fine structure (NEXAFS) spectroscopy to link the orientational bond order at three carbonaceous surfaces-rubbed polyimide, ion beam-irradiated polyimide, and ion beam-irradiated diamondlike carbon films-with the direction of liquid crystal (LC) alignment on these surfaces. We show that, in general, LC alignment can be created on any carbonaceous substrate by inducing orientational order at its surface. Our results form the scientific basis for LC alignment layers consisting of amorphous carbon films in which orientational order near the surface is induced by a directional low-energy ion beam.read more
Citations
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Journal ArticleDOI
Microstructural Characterization and Charge Transport in Thin Films of Conjugated Polymers
TL;DR: The characterization techniques that provide information used to enhance the understanding of structure/property relationships in semiconducting polymers are reviewed.
Journal ArticleDOI
Substrate-induced magnetic ordering and switching of iron porphyrin molecules.
Heiko Wende,Heiko Wende,Matthias Bernien,J. Luo,C. Sorg,N. Ponpandian,J. Kurde,J. Miguel,Marten Piantek,Xiaoying Xu,Ph. Eckhold,Wolfgang Kuch,K. Baberschke,Pooja M. Panchmatia,Biplab Sanyal,Peter M. Oppeneer,Olle Eriksson +16 more
TL;DR: The Fe magnetic moment can be rotated along directions in plane as well as out of plane by a magnetization reversal of the substrate, thereby opening up an avenue for spin-dependent molecular electronics.
Journal ArticleDOI
Substrate-Induced and Thin-Film Phases: Polymorphism of Organic Materials on Surfaces
TL;DR: In this paper, the role of the substrate in controlling the growth and subsequent structural order has been discussed in detail and the impact of polymorphism on organic electronic device properties has been addressed.
Journal ArticleDOI
Carbon (1s) NEXAFS spectroscopy of biogeochemically relevant reference organic compounds
Dawit Solomon,Johannes Lehmann,James Kinyangi,Biqing Liang,Karen Heymann,Lena Dathe,Kelly Hanley,Sue Wirick,Chris Jacobsen +8 more
TL;DR: A comprehensive overview of spectral signatures and peak positions of major organic molecules that occur as part of NOM using near-edge x-ray absorption fine structure (NEXAFS) spectroscopy is presented in this article.
Journal ArticleDOI
Versatility of photoalignment techniques: From nematics to a wide range of functional materials
TL;DR: In this article, a review of photoalignment processes applied to a wide range of materials, surveying relatively recent work, is presented, and some important related alignment and patterning processes are also introduced to clarify the significance of these photo-alignment techniques.
References
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Journal ArticleDOI
Surface-mediated alignment of nematic liquid crystals with polarized laser light
TL;DR: In this article, a new mechanism for liquid-crystal alignment that uses polarized laser light was proposed. But it was not shown to be effective for large-area displays, optical memories, binary optics, adaptive optics and molecular micro-assembly.
Journal ArticleDOI
Solid Surface Shape and the Alignment of an Adjacent Nematic Liquid Crystal
TL;DR: This article showed that elastic strain energy may account for the tendency of some nematic liquid crystals to lie parallel to the direction of rubbing on a solid surface that has been slightly deformed by rubbing, or perpendicular to a surface that is slightly rough in two dimensions.
Journal ArticleDOI
Optical patterning of multi-domain liquid-crystal displays with wide viewing angles
TL;DR: In this paper, the tilt angle between the long molecular axes and the substrates is controlled to improve the field of view of the display. But the alignment pattern imposed on the liquid crystal is free of orientation defects.
Journal ArticleDOI
Properties of diamond-like carbon
TL;DR: In this paper, the preparation and properties of amorphous carbon and hydrogenated amorphized carbon, often known as diamond-like carbon, have been discussed and models of the electronic structure and mechanical properties are used to relate the physical properties to the atomic structure.
Journal ArticleDOI
The mechanism of polymer alignment of liquid‐crystal materials
TL;DR: In this article, the buffing process orients the polymer's molecular chains in a manner similar to cold drawing of bulk polymer samples, and the formation of a liquid-crystal phase on the crystalline, oriented polymer surface is analogous to the epitaxial growth of conventional solid crystals.
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