A5100678842- Liquid Crystal Research Advancements
- Conducting polymers and applications
- Advanced Sensor and Energy Harvesting Materials
- Surfactants and Colloidal Systems
- Synthesis and properties of polymers
- Photonic Crystals and Applications
- Advanced Polymer Synthesis and Characterization
- Graphene research and applications
- Advanced Materials and Mechanics
- Semiconductor materials and devices
- Electrospun Nanofibers in Biomedical Applications
- Lipid Membrane Structure and Behavior
- Advancements in Semiconductor Devices and Circuit Design
- Polymer Nanocomposites and Properties
- Innovative Microfluidic and Catalytic Techniques Innovation
- Graphene and Nanomaterials Applications
- Carbon Nanotubes in Composites
- Electrochemical sensors and biosensors
- biodegradable polymer synthesis and properties
- Analytical Chemistry and Sensors
- Luminescence and Fluorescent Materials
- Nanoparticle-Based Drug Delivery
- Photonic and Optical Devices
- Block Copolymer Self-Assembly
- Peroxisome Proliferator-Activated Receptors
Kyungpook National University
2016-2025
Samsung (South Korea)
2013-2024
Kyungpook National University Hospital
2021-2024
University of Regensburg
2022
Korea Advanced Institute of Science and Technology
2018-2022
Kootenay Association for Science & Technology
2022
Prefectural University of Hiroshima
2021
Electronics and Telecommunications Research Institute
2020-2021
Columbia University
2021
Supreme Prosecutors Office of the Republic of Korea
2021
Chemically modified graphene sheets were dispersed in a high-performance polyimide (PI) matrix using polyamic acid (PAA)/graphene nanocomposite as precursor. PI films with different loadings of prepared by thermal imidization the as-prepared PAA/graphene nanocomposites. Graphene oxide (GO) synthesized Hummer's method was chemically reduced various reducing agents to produce GOs (rGOs). The incorporation only 5 wt % GO resulted an ∼12-fold and ∼18-fold increase tensile strength modulus PI,...
By utilizing a microfluidics approach, we prepared uniformly sized cholesteric liquid crystal (CLC) droplets from MLC-2132 doped with chiral dopant (S)-4-cyano-4'-(2-methylbutyl)biphenyl (CB15). We studied the helical structures and reflecting color patterns of high- low-dopant CLC coated poly(vinyl alcohol) (PVA) sodium dodecyl sulfate (SDS). One central large spot in (initially PVA for planar anchoring) changed to many small spots same (chicken-skin pattern) when an SDS aqueous solution...
The benzoxazole derivative gelator forms a stable DMF/toluene cosolvent gel with dramatically enhanced fluorescence emission compared to its mother solution. translucent colorless was changed solution strong greenish in the presence of fluoride anion disruption structure.
Micrometer-sized, 4-cyno-4-pentylbiphenyl (5CB) droplets were developed for glucose detection in an aqueous medium by coating with poly(acrylicacid-b-4-cynobiphenyl-4-oxyundecylacrylate) (PAA-b-LCP) at the 5CB/water interface and covalently immobilizing oxidase (GOx) to PAA chains. This functionalized liquid-crystal (LC) droplet detected from a radial bipolar configurational change polarized optical microscopy under crossed polarizers concentrations as low 0.03 mM response times of ~3 min...
In the present study, a carbon dot/hemoglobin (CD/Hb) complex is used as bio-receptor in an optical cholesterol biosensor.
Abstract A biosensor array is fabricated using an interpenetrating polymer network consisting of photonic film templated from reactive cholesteric liquid crystal (CLC) and enzyme‐immobilized polyacrylic acid (PAA). The solid‐state on the glass substrate successfully by ultraviolet (UV) curing CLC mixture a mesogen RMM 727 (from Merck) nonreactive chiral dopant ( S )‐4‐cyano‐4′‐(2‐methylbutyl)biphenyl following extraction dopant. acrylic monomer mixed with cross‐linker tri(propylene glycol)...
Abstract A liquid-crystal (LC)-filled transmission electron microscopy (TEM) grid cell coated with the cationic surfactant dodecyltrimethylammonium bromide (DTAB), to which a single-stranded deoxyribonucleic acid probe (ssDNA ) was adsorbed at LC/aqueous interface (TEM DTAB/DNA ), applied for highly specific detection of target DNA molecules. The DTAB-coated E7 (used LC mixture) in TEM DTAB exhibited homeotropic orientation, and changed planar orientation upon adsorption ssDNA . then exposed...
The unique combination of the rubber-like property and photonic helicoidal structure cholesteric liquid-crystal elastomers (CLCEs) results in one-handed circular polarized light reflection, wavelength which is dictated by Bragg relationship. Herein, a highly stretchable mechanochromic CLCE film was fabricated cross-linking mesogenic oligomers having thiol terminal groups, further reacted to form disulfide (-S-S-) linkages. mechanically stretched reflected both right- left-handed lights with...
Herein, a light-responsive and light-induced bond-exchange-reaction (BER)-capable actuator of the monodomain liquid crystal elastomer (xMLCEazo), developed using main-chain mesogenic oligomers containing azobenzene allyl sulfide linkages, is investigated. Large quantities dithiol linkages are incorporated into oligomer prepared via thiol–acrylate Michael addition polymerization (TAMAP). The xMLCEazo film generated visible-light-induced BER drawn polydomain xLCEazo (xPLCEazo) TAMAP tetrathiol...
Abstract Multiwalled carbon nanotube/polycaprolactone nanocomposites (MWNT/PCL) were prepared by in situ polymerization, whereby as‐received MWNTs (P‐MWNTs) and purified (A‐MWNTs) used as reinforcing materials. The A‐MWNTs nitric acid treatment, which introduced the carboxyl groups (COOH) on MWNT. micrographs of fractured surfaces showed that A‐MWNT/PCL better dispersed than P‐MWNTs PCL matrix (P‐MWNT/PCL). Percolation thresholds P‐MWNT/PCL A‐MWNT/PCL, studied rheological properties, found...
A transmission electron microscopy (TEM) grid filled with 4-cyno-4-pentylbiphenyl (5CB) on the octadecyltrichloro silane-coated glass in an aqueous medium was developed to construct a glucose biosensor by coating poly(acrylicacid-b-4-cynobiphenyl-4-oxyundecylacrylate) (PAA-b-LCP) at aqueous/5CB interface and immobilizing oxidase (GOx) covalently PAA chains. The detected from homeotropic planar orientational transition of 5CB polarized optical under crossed polarizers. maximum immobilization...
The structural evolution of poly(ε-caprolactone) (PCL) during uniaxial tensile deformation at 25 °C was examined using small- and wide-angle X-ray scatterings (SAXS WAXS) techniques with simultaneous stress strain (S–S) curves. A high-energy beam the recently upgraded Pohang synchrotron radiation source revealed complete lamellar behavior PCL. Slope-based division S–S curves indicated three distinct regions elastic (region I), yielding II) plastic deformations III). In region I, which showed...
Graphene oxide (GO) was functionalized covalently with pH-sensitive poly(2-(diethylamino) ethyl methacrylate) (PDEA) by surface-initiated in situ atom transfer radical polymerization. The structure of the PDEA-grafted GO (GO-PDEA) were examined Fourier-transform infrared spectroscopy, proton nuclear magnetic resonance X-ray photoelectron thermogravimetric analysis and atomic force microscopy. grafted PDEA endowed sheets good solubility stability physiological solutions. Simple physisorption...
With the rapid advances in liquid crystal (LC) material technology over recent decades, many different practical devices have been developed and commercialized.