A versatile photochemical procedure to introduce a photoreactive molecular layer onto a polyimide film for liquid crystal alignment

Sasaki, Akira; Aoshima, Hozumi; Nagano, Shusaku; Seki, Takahiro

doi:10.1038/pj.2012.45

Cited by 16 publications

(8 citation statements)

References 38 publications

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“…Adhesion of a thin LC films onto a PDMS substrate film was achieved as follows . A silicon wafer was exposed to vacuum UV light (VUV, 172 nm) at 1.0 × 10 3 MPa using a UER20-172 V (Ushio Inc.) to make the surface hydrophilic . A LC polymer film was prepared by spincasting from a chloroform solution.…”

Section: Methodsmentioning

confidence: 99%

“…35 A silicon wafer was exposed to vacuum UV light (VUV, 172 nm) at 1.0 × 10 3 MPa using a UER20-172 V (Ushio Inc.) to make the surface hydrophilic. 36 A LC polymer film was prepared by spincasting from a chloroform solution. A centimeter-sized wafer piece was cleaved from the spin-coated wafer and placed onto the PDMS film with the film side down.…”

Section: Methodsmentioning

confidence: 99%

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Photoresponsive Surface Wrinkle Morphologies in Liquid Crystalline Polymer Films

et al. 2015

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Laminated bilayer films comprised of photoresponsive azobenzene-containing liquid crystalline polymer skin layers adhered on a thick elastomeric substrate were prepared, and the wrinkle formation upon uniaxial compression was investigated. Irradiation with UV light at 365 nm led to the disappearance of the wrinkle or reduction of wrinkle wavelength, depending on the content of azobenzene unit in the polymer. Such photoresponsive modulations of wrinkle formation could be well correlated with the photoinduced changes in the Young’s modulus determined by indentation–retraction force curve measurements using an AFM cantilever. Additionally, the thickness modulation of the skin layer caused by the photoinduced mass migration can also be applied to modify the wrinkle wavelength. These photoresponsive surface wrinkle modulations are anticipated to offer new possibilities for the surface microfabrication technology.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Photoresponsive Surface Wrinkle Morphologies in Liquid Crystalline Polymer Films

et al. 2015

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“…Zur Quantifizierung des Funktionalisierungsgrads der Polystyrol-Mikropartikel wurden die funktionalisierten Polystyrol-Mikropartikel mit Dansylchlorid (DsCl) [46][47][48][49]…”

Section: Zuschriftenunclassified

Ein modifiziertes Ankerpeptid LCI mit einem Cobalt‐Cofaktor verbessert die Oxidationseffizienz von Polystyrol‐Mikropartikeln

Wang,

Ingram,

Luka

et al. 2024

Angewandte Chemie

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A typical component of polymer waste is polystyrene (PS) used in numerous applications, but degraded only slowly in the environment due to its hydrophobic properties. To increase the polarity and reactivity of polystyrene, polar groups need to be introduced. Here, biohybrid catalysts based on an engineered anchor peptide LCI_F16C are presented, which are capable of attaching to polystyrene microparticles and hydroxylating benzylic C‐H bonds in polystyrene microparticles using commercially available oxone as oxidant. LCI peptides achieve a dense surface coverage of PS through monolayer formation within minutes in aqueous solutions at ambient temperature. The catalytically active cobalt cofactor Co‐L1 or Co‐L2 with a modified NNNN macrocyclic TACD ligand (TACD = 1,4,7,10‐tetraazacyclododecane) is covalently bound to the anchor peptide LCI through a maleimide linker. Compared to the free cofactors, a 12‐ to 15‐fold improvement in catalytic activity using biohybrid catalysts based on LCI_F16C was observed.

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“…In recent reports, authors mentioned that the Si-based semiconductor devices has been overtaken globally by the LCD device market (7)(8)(9). Generally, in case of traditional LCDs, to achieve the uniform alignment of LCs, rubbed 'parallel alignment layer' is adopted, however, due to these layers some defects such as, low contrast ratio, narrow viewing angle and slower response time etc (10)(11)(12)(13)(14) in the display devices are seen. Nevertheless, the homeotropic alignment (HA) based LCDs can improve the performance by removing these defects up to greater extent.…”

Section: Introductionmentioning

confidence: 99%

Thickness Dependent Electro-Optical Behaviour of Homeotropically Aligned Nematic Liquid Crystal

Dogra¹,

Sharma²,

Gahrotra³

et al. 2022

ECS Trans.

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The homeotropically aligned liquid crystal (LC) display devices are of great interest in recent time. Thus, in the present work, the thickness dependent electro-optical behaviour of nematic liquid crystal (NLC) in homeotropic alignment (HA) has been studied. To achieve the HA of NLC, polyimide (PI) coated ITO glass substrates were used. Consequently, cleaned ITO glass substrates (with thickness of 0.7 mm) were used for the fabrication of the LC cells. The pure NLC material (LC-BYVA) was filled into PI coated cells by the capillary injection method. Subsequently, the filled cells were examined with the help of polarized optical microscope (POM), which show the good dark and bright orthoscopic textures of NLC in field ON and OFF states, respectively under cross-polarizers. The conoscopic study of the images also confirmed the perfect HA of NLC molecules. The dark states change to good bright state with the change in orientation of NLC director from homeotropic to planar at operating voltages as seen under cross-polarizers. The electro-optical (E-O) study also shows the good contrast ratio (CR) of display cells.

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A versatile photochemical procedure to introduce a photoreactive molecular layer onto a polyimide film for liquid crystal alignment

Cited by 16 publications

References 38 publications

Photoresponsive Surface Wrinkle Morphologies in Liquid Crystalline Polymer Films

Photoresponsive Surface Wrinkle Morphologies in Liquid Crystalline Polymer Films

Ein modifiziertes Ankerpeptid LCI mit einem Cobalt‐Cofaktor verbessert die Oxidationseffizienz von Polystyrol‐Mikropartikeln

Thickness Dependent Electro-Optical Behaviour of Homeotropically Aligned Nematic Liquid Crystal

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