A5073817253- Hydrogels: synthesis, properties, applications
- Advanced Sensor and Energy Harvesting Materials
- Bone fractures and treatments
- Conducting polymers and applications
- Orthopedic Infections and Treatments
- Advanced Materials and Mechanics
- Electrochemical Analysis and Applications
- Advanced Battery Materials and Technologies
- Advanced Polymer Synthesis and Characterization
- Advanced battery technologies research
- Satellite Image Processing and Photogrammetry
- Electrocatalysts for Energy Conversion
- Surfactants and Colloidal Systems
- Orthopedic Surgery and Rehabilitation
- Spine and Intervertebral Disc Pathology
- Cancer and Skin Lesions
- Remote Sensing and Land Use
- Organic Electronics and Photovoltaics
- Micro and Nano Robotics
- Supercapacitor Materials and Fabrication
- Inertial Sensor and Navigation
- Hip and Femur Fractures
- Advancements in Battery Materials
- Genetic and rare skin diseases.
- Nerve Injury and Rehabilitation
Pohang University of Science and Technology
2018-2025
Dong-A University
2022
The University of Tokyo
2015-2018
Samsung Medical Center
2015
Sungkyunkwan University
2009-2015
Ewha Womans University
2010-2012
Korea Aerospace Research Institute
2011-2012
Ewha Womans University Medical Center
2011
Jusung Engineering (South Korea)
2010
Catholic University of Korea
1999-2008
Peristaltic crawling, which is the moving mechanism of earthworm-like limbless creatures in narrow spaces, a challenging target to mimic by using soft materials. Here we report an unprecedented hydrogel actuator that enables not only peristaltic crawling motion but also reversing its direction. Our cylindrically processed contains gold nanoparticles for photothermal conversion, thermoresponsive polymer network switching electrical permittivity gel interior, and cofacially oriented 2D...
As a new class of materials, implantable flexible electrical conductors have recently been developed and applied to bioelectronics. An ideal conductor requires high conductivity, tissue-like mechanical properties, low toxicity, reliable adhesion biological tissues, the ability maintain its shape in wet physiological environments. Despite significant advances, that satisfy all these requirements are insufficient. Herein, facile method for manufacturing conductive hydrogels through...
As novel functional materials, we developed self-oscillating polymeric materials composed of synthetic polymers coupled with an oscillating chemical reaction, the so-called Belousov–Zhabotinsky (BZ) reaction.
Abstract Fluids that contain ordered nanostructures with periodic distances in the visible-wavelength range, anomalously exhibit structural colours can be rapidly modulated by external stimuli. Indeed, some fish dynamically change colour modulating distance of crystalline guanine sheets cofacially oriented their fluid cytoplasm. Here we report a dilute aqueous colloidal dispersion negatively charged titanate nanosheets exhibits colours. In this ‘photonic water’, spontaneously adopt cofacial...
Abstract High‐capacity anode materials are promising candidates for increasing the energy density of lithium (Li)‐ion batteries due to their high theoretical capacities. However, a rapid capacity fading huge volume changes during charge‐discharge cycles limits practical applications. Herein, layering‐charged polymeric binder is introduced that can effectively integrate high‐capacity anodes using strong yet reversible Coulomb interaction and enriched hydrogen bonding. The charged builds...
Abstract Peristaltic crawling, which is the moving mechanism of earthworm‐like limbless creatures in narrow spaces, a challenging target to mimic by using soft materials. Here we report an unprecedented hydrogel actuator that enables not only peristaltic crawling motion but also reversing its direction. Our cylindrically processed contains gold nanoparticles for photothermal conversion, thermoresponsive polymer network switching electrical permittivity gel interior, and cofacially oriented...
OLEDs employing CMB1, a novel binaphthyl-containing bi-nuclear boron complex, as the emitter exhibited bright yellow emission with luminous efficiency of 2.1 cd A−1.
The electrocatalytic activities of nanoporous palladium (npPd) and platinum (npPt) for oxygen reduction reaction (ORR) under alkaline conditions hydrogen peroxide electrochemical reactions neutral were examined. npPd npPt prepared by the deposition each metal from corresponding precursor in presence reverse micelles Triton X-100, directing highly porous microstructures. catalysts showed excellent activity both ORR oxidation/reduction due to increased active surface area. In particular,...
Extraneural Electrodes In article number 2203431, Youn Soo Kim and co-workers introduce an ideal conductive hydrogel for tissue-like extraneural electrodes with high conformability to improve the tissue–electronic interface. This exhibits excellent adhesion, biocompatibility, non-swelling, electrical conductivity in water. The is implanted into sciatic nerve of rats, neuromodulation successfully demonstrated through low-current stimulation.
Abstract Aqueous zinc metal batteries (AZMBs) are emerging energy storage systems that poised to replace conventional lithium‐ion owing their intrinsic safety, facile manufacturing process, economic benefits, and superior ionic conductivity. However, the issues of inferior anode reversibility dendritic plating during operation remain challenging for practical use AZMBs. Herein, a gel electrolyte based on zwitterionic poly(sulfobetaine methacrylate) (poly(SBMA)) dissolved with different...
Herein, the copolymer composition of [AN] and [4VP] units [P(AN-co-4VP)]2-b-PEO (here, AN = acrylonitrile, 4VP 4-vinylpyridine, PEO poly(ethylene oxide)) block (BCP) was controlled by reversible addition–fragmentation chain transfer (RAFT) polymerization to make it acetonitrile-soluble BCP so that this can be further converted into in situ three-dimensional (3D) network polymer gel electrolytes (PGEs) inside cell quaternization reaction acetonitrile-based liquid electrolyte media. Before...
Most triblock copolymer-based physical hydrogels form three-dimensional networks through micellar packing, and formation of polymer loops represents a topological defect that diminishes hydrogel elasticity. This effect can be mitigated by maximizing the fraction elastically effective bridges in network. Herein, we report constructed complexing oppositely charged multiblock copolymers designed with sequence pattern maximizes entropic enthalpic penalty micellization. These self-assemble into...
Complex coacervation plays an important role in various fields. Here, the influences of backbone chemistry and ionic functional groups five pairs oppositely charged polyelectrolytes on complex were investigated. These include synthetic polymers with aliphatic hydrocarbon backbones, peptides amide bonds, carbohydrates glycosidic linkages. Despite sharing identical groups, specific displayed distinct liquid/liquid liquid/solid phase separations depending polyelectrolyte mixing ratio, buffer,...
Abstract Quasi‐solid‐state batteries (QSSBs) are attracting considerable interest as a promising approach to enhance battery safety and electrochemical performance. However, QSSBs utilizing high‐capacity active materials with substantial volume fluctuations, such Si microparticle (SiMP) anodes Ni‐rich cathodes (NCM811), suffer from unstable interfaces due contact loss during cycling. Herein, an in situ interlocking electrode–electrolyte (IEE) system is introduced, leveraging covalent...
PEDOT counter electrodes, optimized via spin-coating a DMSO-dispersed solution from scalable synthesis, were evaluated for cobalt reduction in dye-sensitized solar cells. was superior electrocatalyst compared to Pt.
Polymeric Binders In article number 2213458, Soojin Park, Jaegeon Ryu, Youn Soo Kim, and co-workers present an unprecedented layering-charged polymeric binder for high-capacity anodes. The charge-directed network efficiently dissipates the stress of electrode during cycling using a reversible Coulomb interaction exhibits superior electrochemical performance various anode materials.
A series of palladium nanoparticles supported on carbon nanotubes (CNTs), which were functionalized covalently with imidazolium polymer salts different anions, Pd/polyIL(X)-CNTs (IL=ionic liquid; X=Cl, Br, I, ClO(4), BF(4), PF(6)), prepared to investigate the influence imidazolim salt anions electrocatalytic activity in oxygen reduction reaction (ORR). The moiety significantly impacted ORR kinetics a 0.1 M solution HClO(4). electronically active surface area results are good agreement order...
Gold nanoparticles (AuNPs) were assembled with high density onto multi-walled carbon nanotubes, which functionalized zwitterionic poly(imidazoliumsulfonate). The AuNP/zwitterionic CNT hybrids exhibited decent electrocatalytic activity in oxygen reduction reaction as the AuNP-based catalysts.
Thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) hydrogels have been attracting attention in a variety of functional materials, such as biomaterials, because they exhibit volume phase transition phenomenon near physiological temperatures. However, the slow kinetics and small shrinkage bulk PNIPAAm upon heating greatly limit their practical application. Here, we report with phase-separated structures that exhibited ultrafast shrinking heating. The separation into PNIPAAm-rich water-rich...