A5101902761- Advanced Sensor and Energy Harvesting Materials
- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Advanced Materials and Mechanics
- Innovative Microfluidic and Catalytic Techniques Innovation
- Thin-Film Transistor Technologies
- Conducting polymers and applications
- Nanomaterials and Printing Technologies
- Organic Electronics and Photovoltaics
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Methane Hydrates and Related Phenomena
- Electrowetting and Microfluidic Technologies
- Boron and Carbon Nanomaterials Research
- Spacecraft and Cryogenic Technologies
- Hydrogels: synthesis, properties, applications
- Electrohydrodynamics and Fluid Dynamics
- Offshore Engineering and Technologies
- Nanofabrication and Lithography Techniques
- Plant and animal studies
- Carbon Nanotubes in Composites
- Solar-Powered Water Purification Methods
- Advanced Antenna and Metasurface Technologies
- 3D Printing in Biomedical Research
- ZnO doping and properties
Korea Institute of Science and Technology
2019-2024
Korea Institute of Materials Science
2022-2023
Pusan National University
2023
University of Science and Technology
2023
Korea Advanced Institute of Science and Technology
2014-2019
Seoul National University of Science and Technology
2019
Government of the Republic of Korea
2016-2018
Daejeon University
2016-2018
Kootenay Association for Science & Technology
2017-2018
Electronics and Telecommunications Research Institute
2013-2017
We demonstrate a new patterning technique for gallium-based liquid metals on flat substrates, which can provide both high pattern resolution (∼20 μm) and alignment precision as required highly integrated circuits. In very similar manner in the of solid metal films by photolithography lift-off processes, layer painted over whole substrate area be selectively removed dissolving underlying photoresist layer, leaving behind robust patterns defined photolithography. This quick simple method makes...
Robust photonic microcapsules are created by microfluidic encapsulation of cholesteric liquid crystals with a hydrogel membrane. The membrane encloses the core without leakage in water and exhibits pronounced structural colors. ink capsules, which have precisely controlled bandgap position size, provide new opportunities colorimetric micro-thermometers optoelectric applications.
Photonic microcapsules with onion-like topology are microfluidically designed to have cholesteric liquid crystals opposite handedness in their core and shell. The exhibit structural colors caused by dual photonic bandgaps, resulting a rich variety of color on the optical palette. Moreover, can switch from either or shell depending selection light-handedness.
Cholesteric liquid crystals (CLCs) have a photonic bandgap due to the periodic change of refractive index along their helical axes. The CLCs containing optical gain served as band-edge lasing resonators. In particular, in granular format provide omnidirectional lasing, which are promising point light source. However, there is no platform that simultaneously achieves high stability air and wavelength tunability. We encapsulate with double shells design capsule-type laser resonator. fluidic...
Abstract Cholesteric liquid crystals (CLCs) reflect selected wavelengths of light owing to their periodic helical structures. The encapsulation CLCs leads photonic devices that can be easily processed and might used as stand‐alone microsensors. However, when are enclosed by polymeric membranes, they usually lose planar alignment, leading a deterioration the optical performance. A microfluidics approach was employed integrate an ultrathin alignment layer into microcapsules separate CLC core...
Abstract Cholesteric liquid crystals (CLCs), also known as chiral nematic LCs, show a photonic stopband, which is promising for various optical applications. In particular, CLCs confined in microcompartments are useful sensing, lasing, and barcoding at the microscale. The integration of distinct into single microstructures can provide advanced functionality. this work, CLC multishells with multiple stopbands created by liquid–liquid phase separation (LLPS) simple yet highly controlled...
Microfluidics has provided means to control emulsification, enabling the production of highly monodisperse double-emulsion drops; they have served as useful templates for microcapsules. To provide new opportunities templates, here, we report a design capillary microfluidic devices that create nonspherical drops with multiple distinct cores covered by ultrathin middle layer. accomplish this, parallelize channels, each which biphasic flow in form core-sheath stream; this is achieved...
Mechanically stable photonic micro particles based on polymerized cholesteric liquid crystals (CLCs) and its self-assembled patterns for anti-forgery applications.
Microgels, microparticles made of hydrogels, show fast diffusion kinetics and high reconfigurability while maintaining the advantages being useful for various applications. Here, presented is a new microfluidic strategy producing polymer-graphene oxide (GO) composite microgels without chemical cues or temperature swing gelation. As main component microgels, polymers that are able to form hydrogen bonds, such as polyvinyl alcohol (PVA), used. In mixture PVA GO, GO tethered by through bonding....
Microfiber fabrication via wet-spinning of lyotropic liquid crystals (LCs) with anisotropic nanomaterials has gained increased attention due to the microfibers' excellent physical/chemical properties originating from unidirectional alignment along fiber axis high packing density. For microfibers, however, preparing LCs by achieving colloidal stability nanomaterials, even at concentrations, been a critically unmet prerequisite, especially for recently emerging nanomaterials. Here, we propose...
Abstract Microcapsules with molecule‐selective permeation are appealing as microreactors, capsule‐type sensors, drug and cell carriers, artificial cells. To accomplish molecular size‐ charge‐selective permeation, regular size of pores surface charges have been formed in the membranes. However, it remains an important challenge to provide advanced regulation transmembrane transport. Here, smart microcapsules designed that polarity‐ temperature‐dependent permeability. With capillary...
The authors fabricated stretchable organic ferroelectric memory transistors (OFMTs) on a polydimethylsiloxane substrate using rigid polyimide island structures.
Monodisperse microcapsules with ultra‐thin membranes are microfluidically designed to be highly sensitive osmotic pressure, thereby providing a tool for the direct measurement of strength. To make such osmocapsules, water‐in‐oil‐in‐water double‐emulsion drops shells prepared as templates through emulsification core–sheath biphasic flow in capillary microfluidic device. When photocurable monomers used oil phase, osmocapsules by in‐situ photopolymerization monomers, resulting semipermeable...
Stretchable organic thin-film transistors (OTFTs) were fabricated on the polydimethysiloxane (PDMS) elastomer substrates by employing wavy-dimensional and polyimide stiff-island structures. A low-temperature solution process was also designed to obtain high strain profiles. The endurable maximum strains estimated be 2.28, 9.70, 9.32% for OTFTs formed flat, 1D-, 2D-wavy PDMS elastomers, respectively. field-effect mobilities obtained 5 ~ 7 × 10 <sup...
Boron nitride nanotube (BNNT) has attracted recent attention owing to its exceptional material properties; yet, practical implementation in real-life applications been elusive, mainly due the purity issues associated with large-scale synthesis. Although different purification methods have discussed so far, there lacks a scalable solution method community. In this work, simple, high-throughput, and of BNNT is reported via modification an established sorting technique, aqueous polymer...
Triplet-fusion-based photon upconversion capsules with ultrathin double shells are developed through a single dripping instability in microfluidic flow-focusing device. An inner separation layer allows use of brominated hydrocarbon oil-based fluidic core, demonstrating significantly enhanced quantum yield. Furthermore, perfluorinated photocurable monomer serves as transparent shell phase remote motion control magnetic nanoparticle incorporation.
In this study, magnesium-doped (Mg-doped) zinc oxide (ZnO) nanoparticles were successfully synthesized by a sonochemical process under mild conditions. The x-ray diffraction pattern indicated that the Mg-doped ZnO maintain wurtzite structure without impurities. We observed blue-shift of bandgap as Mg-doping ratio increased. also fabricated thin-film transistor (TFT) devices with doped-ZnO nanoparticles. Devices using channel layer showed insensibility to white-light irradiation compared undoped TFTs.
A new structure of stretchable and transparent metal-grid electrodes is described, where a liquid metal alloy, eutectic gallium-indium (EGaIn) employed as conducting material. By "roll-painting lift-off" technique based on photolithography, EGaIn-grids with the linewidth 20 μm line pitch 400-1000 are produced, providing transmittance 75%-88% sheet resistance less than 2.3 Q/square. Powered by freely deformable nature phase conductor, EGaIn-grid provides stable conductivity under highly...
Well-defined and highly conductive Cu mesh transparent electrodes are prepared by a vacuum-free solution process.
Abstract Cholesteric liquid crystals (CLCs) reflect selected wavelengths of light owing to their periodic helical structures. The encapsulation CLCs leads photonic devices that can be easily processed and might used as stand‐alone microsensors. However, when are enclosed by polymeric membranes, they usually lose planar alignment, leading a deterioration the optical performance. A microfluidics approach was employed integrate an ultrathin alignment layer into microcapsules separate CLC core...
The preparation of a stretchable substrate was carried out by blending poly (ethylene glycol)-block-poly (propylene glycol)-block-poly(ethylene glycol) and polydimethylsiloxane (PDMS) to enhance the stretchability surface energy elastic film. deposition thin parylene film on this modified PDMS led formation spontaneously wrinkled surface, resulting in highly substrate. Rigid Au conductors were deposited resultant wrinkles substrates, could be stretched up 20% strain. In addition, pentacene...