Article
Polymer Science
DaEun Yang, Chowon Jin, Hyo Kang
Summary: In this study, sustainable polystyrenes substituted with 2,4-di-tert-butylphenoxymethyl groups were synthesized using post-polymerization modification reactions. The liquid crystal alignment behaviors of these polymers were investigated, and it was found that higher molar content of 2,4-di-tert-butylphenoxymethyl side groups resulted in vertical liquid crystal alignment behavior. The surface energy of the polymer alignment layer played a role in the liquid crystal alignment behavior.
Article
Polymer Science
Kyutae Seo, Hyo Kang
Summary: A series of polystyrene derivatives modified with liquid crystal precursors were synthesized, and the orientation of liquid crystal molecules on polymer films was systematically investigated. The LC molecules showed stable and uniform vertical orientation in LC cells fabricated with P2BO# containing 40 mol% or more ethylbenzoate-p-oxymethyl side groups.
Article
Polymer Science
Kyutae Seo, Hyo Kang
Summary: By modifying polystyrene derivatives with liquid crystal precursors, the orientation of liquid crystal (LC) molecules on polymer films was investigated. Stable and uniform vertical orientation of LC molecules was observed in LC cells with specific molar fractions of side groups, and water contact angle on polymer films was linked to the LC molecules' vertical orientation. Good orientation stability was observed in LC cells fabricated with PECH films under specific conditions.
Article
Polymer Science
Jihyeon Moon, Chaewon Kang, Hyo Kang
Summary: The effect of polymer films with similar liquid crystal molecular structure on liquid crystal alignment properties was examined using modified polystyrene derivatives, resulting in different alignments depending on the chemical structure of the derivatives. Vertical liquid crystal alignment was found to be associated with the polar surface energy of the films.
Article
Polymer Science
Jihyeon Moon, Kyutae Seo, Hyo Kang
Summary: This study demonstrates the vertical liquid crystal alignment behavior on the surface of phytochemical-based and renewable chavicol-modified polystyrene via polymer modification reactions. There is a correlation between the vertical alignment of LC molecules and the polar surface energy value of the polymer films. The chavicol-substituted polymer system can produce an eco-friendly and sustainable LC alignment layer for next-generation applications.
Article
Polymer Science
DaEun Yang, Kyutae Seo, Hyo Kang
Summary: A series of renewable and plant-based isoeugenol-substituted polystyrenes were synthesized to study their liquid crystal alignment behavior, showing that higher molar content of isoeugenol side groups resulted in vertical LC alignment. The surface energy value of the polymer layer played a key role in determining the alignment behavior. Good alignment stability was observed at high temperature and under UV irradiation for LC cells fabricated using PIEU100, demonstrating the potential of renewable isoeugenol-based materials in producing eco-friendly vertical LC alignment systems.
Article
Physics, Fluids & Plasmas
A. Nych, R. Kravchuk, U. Ognysta, M. Ledney, O. Yaroshchuk
Summary: The study investigates the orientational configurations of thermotropic nematic liquid crystal in cylindrical capillaries with nondegenerated planar surface anchoring. By applying photoaligning coating on the inner wall of the capillary treated with UV light, different twisted structures can be achieved, from axial alignment with zero twist to 180 degrees-twisted configuration. Optical ray tracing calculations reveal the UV light intensity and polarization distribution over the inner capillary surface, providing valuable insights into liquid crystal behavior.
Article
Polymer Science
Kyutae Seo, Hyo Kang
Summary: A series of polystyrene derivatives modified with liquid crystal precursors were synthesized to investigate the orientation of LC molecules on polymer films, showing stable and uniform vertical orientation in LC cells fabricated with polymers containing a specific molar fraction of 4-ethyloxyphenoxymethyl. This study found that the vertical orientation of LC molecules in LC cells correlated with the surface energy of polymer films, and good alignment stability was observed under certain conditions.
Article
Optics
Xin Xie, Wenjuan Du, Zhenglong Shao, Yingjie Zhou, Zhilang Lou, Ruonan Ji, Dandan Wen, Bingyan Wei, Xuetao Gan, Jianlin Zhao, Fan Fan, Dongliang Tang
Summary: Planar liquid crystal (LC) optics has made progress in achieving multifunctional and integrated light manipulation through the proposal of several LC elements. The designs include gray-image multiplexing for independent binary gray images and manipulation of amplitude and phase for the integration of a holographic image, resulting in a tri-channel display. The proposed strategy also demonstrates the electrical tunability of the LC molecule for image control.
LASER & PHOTONICS REVIEWS
(2023)
Article
Crystallography
Yuan Deng, Shi-Qin Li, Qian Yang, Zhi-Wang Luo, He-Lou Xie
Summary: This study introduces a novel smart window with CNT-PDB as the orientation layer, which can rapidly respond to NIR light and adjust light transmittance to prevent sunlight from entering the room, improving energy efficiency.
Article
Chemistry, Multidisciplinary
Lynn Anderson, Edward W. Sanders, Matthew G. Unthank
Summary: The development of recyclable thermoset materials with high performance requires designing recyclability into the molecular structure. This paper presents a single stage process using liquid epoxy resins and aliphatic amines polymerized in the presence of n-butyl diboronic ester to create epoxy-amine-dioxazaborocane materials with tunable physical properties. The mechanical (thermal) recycling and reprocessing of the thermoset show retention of Young's modulus and ultimate tensile strength. Importantly, an efficient and low-cost process for chemical recycling, disassembly, and dissolution is demonstrated using pinacol (diol) or mono-functional phenylboronic ester.
MATERIALS HORIZONS
(2023)
Article
Multidisciplinary Sciences
Piramon Pokkanta, Jitkunya Yuenyong, Sugunya Mahatheeranont, Sudarat Jiamyangyuen, Phumon Sookwong
Summary: This study investigated the effects of microwave treatment on the bioactive compounds and antioxidant activity of rice bran. The results showed that microwave treatment could enhance the antioxidant activity and content of phytochemicals in rice bran, especially trans-p-coumaric acid and kaempferol. The optimal microwave treatment condition was found to be 440 W for 2.5 min.
SCIENTIFIC REPORTS
(2022)
Article
Nutrition & Dietetics
Jiratchaya Wisetkomolmat, Chaiwat Arjin, Apinya Satsook, Mintra Seel-audom, Warintorn Ruksiriwanich, Chanakan Prom-u-Thai, Korawan Sringarm
Summary: Raising awareness about the nutritional quality and health benefits of rice is crucial for promoting its consumption in daily diets. This study analyzed the proximate components and phytochemical profiles of various Thai rice bran varieties. The results showed significant variations in the nutritional and bioactive components among different rice bran varieties. The findings can guide the selection of phytochemical-rich varieties for use as value-added components in nutritional products.
FRONTIERS IN NUTRITION
(2022)
Article
Polymer Science
DaEun Yang, Kyutae Seo, Hyo Kang
Summary: The vertical liquid crystal alignment on polymer films is influenced by the position and structure of the terminal moiety of the polymer side group. Different side groups lead to different liquid crystal alignments, and the alignment is affected by the surface energy of the polymer films.
Review
Chemistry, Analytical
Jinan Deng, Dandan Han, Jun Yang
Summary: Liquid crystals with stimuli-responsive configuration transition and optical anisotropic properties are of great interest for the development of simple and label-free biosensors. The combination of microfluidics and LCs offers advantages such as small sample consumption, fast analysis, and low cost, making LC-based biosensors more efficient. Challenges and future perspectives in developing LC-based microfluidic biosensors are also discussed in this review.