Phase separation and pattern instability of laser-induced polymerization in liquid-crystal-monomer mixtures

Jisha, Chandroth P.; Hsu, Kai-Chieh; Lin, Yuan-Yao; Lin, Ja‐Hon; Chuang, Kai-Ping; Tai, Chao Yi; Lee, Ray-Kuang

doi:10.1364/cleo_si.2012.ctu1j.2

Cited by 2 publications

(2 citation statements)

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“…When E7 was doped with 4-wt.% NAO65 and irradiated with UV at 20 mW/cm 2 for 0, 60, 180 or 300 s in the absence of BSA, ε ’ remained unchanged irrespective of exposure times ( Figure 6 b). The slight decrease in ε ’ at each exposure time compared with the parallel component of the dielectric constant of E7 ( ε ‖ = 19.5), which represents the state where the LC molecules were vertically aligned, may be partially attributed to the doped NOA65, which has a dielectric constant of 4.6 [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Signal Amplification in an Optical and Dielectric Biosensor Employing Liquid Crystal-Photopolymer Composite as the Sensing Medium

et al. 2021

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An optical and dielectric biosensor based on a liquid crystal (LC)–photopolymer composite was established in this study for the detection and quantitation of bovine serum albumin (BSA). When the nematic LC E7 was doped with 4-wt.% NOA65, a photo-curable prepolymer, and photopolymerized by UV irradiation at 20 mW/cm2 for 300 s, the limit of detection determined by image analysis of the LC optical texture and dielectric spectroscopic measurements was 3400 and 88 pg/mL for BSA, respectively, which were lower than those detected with E7 alone (10 μg/mL BSA). The photopolymerized NOA65, but not the prepolymer prior to UV exposure, contributed to the enhanced optical signal, and UV irradiation of pristine E7 in the absence of NOA65 had no effect on the optical texture. The effective tilt angle θ, calculated from the real-part dielectric constant ε’, decreased with increasing BSA concentration, providing strong evidence for the correlation of photopolymerized NOA65 to the intensified disruption in the vertically oriented LC molecules to enhance the optical and dielectric signals of BSA. The optical and dielectric anisotropy of LCs and the photo-curable dopant facilitate novel quantitative and signal amplification approaches to potential development of LC-based biosensors.

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Section: Resultsmentioning

confidence: 99%

Signal Amplification in an Optical and Dielectric Biosensor Employing Liquid Crystal-Photopolymer Composite as the Sensing Medium

et al. 2021

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“…Two papers focusing on nematic-polymer hybrids are also compiled in this special issue. While Jisha et al [14] provide a laser lithography treatment by employing an ultra-short femtosecond laser pulse to manipulate phase separation morphologies as well as pattern formation in polymer-dispersed LCs, Ouskova, Vapaavuori, and Kaivola [15] develop a dyedoped LC-polymer composite that can be used in optoelectronic applications as a simple and quite efficient photosensitive smart material entailing no additional aligning treatment.…”

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confidence: 99%

Focus issue introduction: liquid crystal materials for photonic applications

Lee

2011

Opt. Mater. Express

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This special issue, "Liquid Crystal Materials for Photonic Applications," within the December 2011 publication of Optical Materials Express, highlights recent advances in liquid crystal material research. It features a collection of articles on materials and device properties of bluephase liquid crystals, dye-doped cholesteric liquid crystals, dispersions in nematic and chiral nematic liquid crystals, and of mesophase-polymer composites.

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Phase separation and pattern instability of laser-induced polymerization in liquid-crystal-monomer mixtures

Cited by 2 publications

References 4 publications

Signal Amplification in an Optical and Dielectric Biosensor Employing Liquid Crystal-Photopolymer Composite as the Sensing Medium

Signal Amplification in an Optical and Dielectric Biosensor Employing Liquid Crystal-Photopolymer Composite as the Sensing Medium

Focus issue introduction: liquid crystal materials for photonic applications

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