Effects of surface modification with reactive mesogen on the anchoring strength of liquid crystals

Moon, Yeon Kyu; Lee, You Jin; Jo, Soo In; Kim, Young‐Sik; Heo, Jeong Uk; Baek, Ji Ho; Kang, Sung Gon; Yu, Chang‐Jae; Kim, Jae-Hoon

doi:10.1063/1.4809746

Cited by 16 publications

(8 citation statements)

References 17 publications

(17 reference statements)

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“…Polymer layers formed at the ITO/LC interfaces significantly improve the anchoring strength and lead to stabilization of LC alignment. As reported, 41,54 during the RM polymerization process, polymerization-induced phase separation occurs, and the polymerized RM aggregates will migrate toward the interface and be immobilized over the SAA layer, forming the stabilization layer for the irreversible homeotropic alignment. The formed RM stabilization layer increases the hardness and roughness of the alignment surface, hence increasing the surface anchoring energy of the alignment layer.…”

Section: ■ Results and Discussionmentioning

confidence: 81%

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Kumar

Jiang

et al. 2020

ACS Appl. Electron. Mater.

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Homeotropic alignment of liquid crystals (LCs) is one of the key modes used in commercial liquid crystal displays (LCDs) due to its advantages, such as high contrast ratios and fast response speed. Here, we report stable homeotropic LC alignment with a small pretilt angle in a nematic, negative LC host doped with additives including self-aligning agents, photoresponsive azo dyes and reactive mesogen via an in-situ self-assembled, dual-wavelength photoalignment approach. The underlying mechanism of stable, pretilted homeotropic LC alignment was further analyzed in detail. The achieved pretitled homeotropic LC cells are very stable against heat and UV light exposure and demonstrate excellent electro-optical characteristics. The experimental results show that such a noncontact, simple homeotropic alignment technique has big potential in many applications, such as high-quality LCDs, spatial light modulators, and other optoelectronic devices.

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Section: ■ Results and Discussionmentioning

confidence: 81%

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Kumar

Jiang

et al. 2020

ACS Appl. Electron. Mater.

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“…The results of such characterization are shown in Figure 4. [14][15]. Based on the analysis preparations and characteristics of liquid crystal composites PMMA-diacrylate resin was a new material that was interesting for identification for its applications [5,16].…”

Section: Figure 2 Ftir Spectrum Of Liquid Crystal Composites Mma-diac...mentioning

confidence: 99%

Synthesis liquid crystal composites diacrylate resin of 2-methyl-1,4-phenylene bis(4-(3-acryloyloxy)propoxy)benzoate) with methyl methacrylate

Afrizal,

Budi,

Riswoko

et al. 2023

J. Phys.: Conf. Ser.

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Liquid crystal composite is a material made from monomer liquid crystal with other materials. These composites are very useful because they combine good properties of each material for many applications. Liquid crystal diacrylate resin of 2-methyl-1,4-phenylene bis(4-(3-(acryloyloxy) propoxy)benzoate) that combined with monomer methyl methacrylate (MMA) using casting solution method. Process casting solution of that material using variation weight percentage of each material. Result of casting solution was photopolymerized using preparate glass to make a thin layer polymer. Characterization thin layer polymer liquid crystal diacrylate resin with MMA using instrumentations FTIR for identify of chemical group functions molecules. FTIR spectrum showed peak at 1155 cm−1-1160 cm−1 for identifications stretching vibration of C-O-C in ester molecule and 2925-2960 cm−1 for identifying the stretching vibration of –CH3. Its band for identify bond formation between MMA with diacrylate resin. Diffractogram XRD showed thin layer polymer of PMMA-diacrylate resin has amorphous properties, because there aren’t sharp peak diffraction at 2θ 16.33°, 24.02°, 44.68°, and 72.54°. This result indicates that thin monomer methyl methacrylate blending perfect with diacrylate resin. Therefore analysis morphology of thin layer liquid crystal composite of PMMA-diacrylate resin homogen in some regions but in a little surface seen agglomeration of polymer.

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“…The surface tilting angle of the RM and SO molecules on the alignment layer was determined by anchoring the competition between the homeotropic anchoring PI and the planar-anchoring polymerized surface RM [ 51 , 52 ]. In addition, the alignment property of the RM molecules used in the dielectric layer could be improved by the well-aligned RM molecules within the PI layer by the rubbing process [ 40 , 48 , 49 , 50 , 51 , 52 , 53 ]. In our approach, the UV-cured surface RM molecules improved the alignment property of the bulk RM layer and controlled the θ eff property for efficient electrical UV sensing with the MIM structure.…”

Section: Operation Scheme and Experimental Proceduresmentioning

confidence: 99%

Tilted Orientation of Photochromic Dyes with Guest-Host Effect of Liquid Crystalline Polymer Matrix for Electrical UV Sensing

Ranjkesh

Park

et al. 2015

Sensors

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We propose a highly oriented photochromic dye film for an ultraviolet (UV)-sensing layer, where spirooxazine (SO) derivatives are aligned with the liquid crystalline UV-curable reactive mesogens (RM) using a guest-host effect. For effective electrical UV sensing with a simple metal-insulator-metal structure, our results show that the UV-induced switchable dipole moment amount of the SO derivatives is high; however, their tilting orientation should be controlled. Compared to the dielectric layer with the nearly planar SO dye orientation, the photochromic dielectric layer with the moderately tilted dye orientation shows more than seven times higher the UV-induced capacitance variation.

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Effects of surface modification with reactive mesogen on the anchoring strength of liquid crystals

Cited by 16 publications

References 17 publications

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Highly Stable, Pretilted Homeotropic Alignment of Liquid Crystals Enabled by In Situ Self-Assembled, Dual-Wavelength Photoalignment

Synthesis liquid crystal composites diacrylate resin of 2-methyl-1,4-phenylene bis(4-(3-acryloyloxy)propoxy)benzoate) with methyl methacrylate

Tilted Orientation of Photochromic Dyes with Guest-Host Effect of Liquid Crystalline Polymer Matrix for Electrical UV Sensing

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