Journal ArticleDOI
Design of Surfaces for Patterned Alignment of Liquid Crystals on Planar and Curved Substrates
Vinay Gupta,Nicholas L. Abbott +1 more
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In this article, a set of surfaces formed by chemisorption of alkanethiols on ultrathin films of gold permit control of both the azimuthal and polar orientations of supported nematic liquid crystals (LCs).Abstract:
Molecularly designed surfaces formed by chemisorption of alkanethiols on ultrathin films of gold permit control of both the azimuthal and polar orientations of supported nematic liquid crystals (LCs). These surfaces, when patterned, form simple and versatile templates for the fabrication of complex optical structures from LCs. Surfaces patterned with odd or even alkanethiols, or mixtures of long and short alkanethiols, were used to fabricate tunable, micrometer-scale LC diffraction gratings that differed in their polarization sensitivity. Patterned alignment of LCs on curved surfaces is also demonstrated, thereby providing principles for fabrication of optical elements that combine diffractive and refractive optics.read more
Citations
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Self-assembled monolayers of thiolates on metals as a form of nanotechnology.
Journal ArticleDOI
Structure and growth of self-assembling monolayers
TL;DR: In this article, the structural phases and the growth of self-assembled monolayers (SAMs) are reviewed from a surface science perspective, with emphasis on simple model systems, and a summary of the techniques used for the study of SAMs is given.
Patent
Organic light-emitting device
Yoon-Hyun Kwak,Seok-Hwan Hwang,Young-Kook Kim,Hye-jin Jung,Jong-hyuk Lee,Jin-O Lim,Hyung-Jun Song +6 more
TL;DR: In this paper, the authors presented a heterocyclic compound and an organic light-emitting device including the HOC compound, which have high efficiency, low driving voltage, high luminance and long lifespan.
Journal ArticleDOI
Control of crystal nucleation by patterned self-assembled monolayers
TL;DR: In this article, a self-assembled monolayer is used to obtain ordered crystallization of calcite in the polar regions, where the rate of nucleation is fastest; crystallization can be suppressed elsewhere by a suitable choice of array spacing, which ensures that the solution is undersaturated in the methyl-terminated regions.
Journal ArticleDOI
Surface relief structures on azo polymer films
Nirmal K. Viswanathan,Dong-Yu Kim,Shaoping Bian,John Williams,Wei Liu,Lian Li,Lynne A. Samuelson,Jayant Kumar,Sukant K. Tripathy +8 more
TL;DR: In this article, the design and synthesis of several classes of suitable azobenzene functionalized polymers for the surface relief grating (SRG) formation process is discussed and experimental studies are carried out to understand the chemical and physical intricacies involved in the SRG formation process.
References
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Journal ArticleDOI
Fundamental studies of microscopic wetting on organic surfaces. 1. Formation and structural characterization of a self-consistent series of polyfunctional organic monolayers
TL;DR: In this article, a series of terminally substituted alkyl thiols, X(CH 2 ) 15 SH (X=CH 3, CH 2 OH, CO 2 H, CO2 CH 3, and CONH 2 ), have been prepared by adsorption from solution onto evaporated gold substrates.
Journal ArticleDOI
Optical Switching and Image Storage by Means of Azobenzene Liquid-Crystal Films
Tomiki Ikeda,Osamu Tsutsumi +1 more
TL;DR: Trans-cis photoisomerization of azobenzene with a laser pulse resulted in a nematic-to-isotropic phase transition with a rapid optical response of 200 microseconds.
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
The electrochemical desorption of n-alkanethiol monolayers from polycrystalline Au and Ag electrodes
TL;DR: In this article, the surface coverage of the oxidized n-alkanethiol species is shown to be 9.3×10−10 mol/cm2 and 7.0 × 10−10 cm2 on Au and Ag, respectively.
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.