A5100638467- Block Copolymer Self-Assembly
- Advanced Polymer Synthesis and Characterization
- Polymer Surface Interaction Studies
- Supercapacitor Materials and Fabrication
- Advanced Memory and Neural Computing
- Process Optimization and Integration
- Fuel Cells and Related Materials
- Advanced Battery Materials and Technologies
- Advanced Control Systems Optimization
- Neuroscience and Neural Engineering
- Fluid Dynamics and Thin Films
- Biofuel production and bioconversion
- Thin-Film Transistor Technologies
- Semiconductor materials and devices
- Advancements in Battery Materials
- Catalytic Processes in Materials Science
- CCD and CMOS Imaging Sensors
- Nanofabrication and Lithography Techniques
- Hair Growth and Disorders
- Conducting polymers and applications
- Surface Modification and Superhydrophobicity
- Maritime Ports and Logistics
- Membrane-based Ion Separation Techniques
- Layered Double Hydroxides Synthesis and Applications
- Urban and Freight Transport Logistics
Seoul National University
2015-2025
Korea Research Institute of Standards and Science
2021-2025
Sungkyunkwan University
2002-2024
Yonsei University
2010-2024
Korea Institute of Toxicology
2024
Chung-Ang University
2024
Daewoo Electronics (South Korea)
2023-2024
Kangbuk Samsung Hospital
2024
Duke University
2020-2023
Korea Polar Research Institute
2023
Generating laterally ordered, ultradense, macroscopic arrays of nanoscopic elements will revolutionize the microelectronic and storage industries. We used faceted surfaces commercially available sapphire wafers to guide self-assembly block copolymer microdomains into oriented with quasi–long-range crystalline order over arbitrarily large wafer surfaces. Ordered cylindrical 3 nanometers in diameter, areal densities excess 10 terabits per square inch, were produced. The sawtoothed substrate...
Chiral organic–inorganic hybrid perovskites exhibiting circular dichroism were prepared as a new class of chiral semiconductors.
Controlling the orientation and lateral ordering of block copolymer microdomains is essential to their use as templates scaffolds for fabrication nanostructured materials. In addition, a process must be robust, simple implement, rapid, should not introduce disruptive processing steps that would impede use. Here, we describe thin films poly(styrene-b-4-vinylpyridine) (PS-b-P4VP) diblock copolymers, spin-coated from mixed solvents show highly oriented, cylindrical with high degree order on...
It is well-known that block copolymer thin films can be easily prepared on different substrates by spin coating. Here, we show the cylindrical microdomains of polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) copolymers oriented normal to surface over a large area coating in toluene/THF solvent mixture. The structure and size PS-b-P4VP solution were compared with those films. was found microdomains, obtained coating, film depended strongly amount THF casting solution. study extended molecular...
The development of the morphology in asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) thin films tetrahydrofuran (THF) vapor, a selective solvent for majority PS block, as function time was investigated by scanning force microscopy (SFM) and grazing incidence small-angle X-ray scattering (GISAXS). When PS-b-P4VP were spin-coated from toluene/THF mixture onto silicon substrate, cylindrical microdomains found to be oriented normal surface. By annealing under THF distribution size...
We have prepared functionalized nanoporous thin films from a polystyrene-block-polyethylene oxide block copolymer, which was made cleavable due to the intervening disulfide bond. The cleavage reaction of bond leaves behind free thiol groups inside nanopores polystyrene film. This film can be used as template for generating gold nanoring structures. strategy provide facile method form highly ordered array biopolymer or metal−polymer composite
We demonstrate three different transfer patterns that can be achieved by use of a surface reconstructed block copolymer film where metal is evaporated onto the film, providing contrast. Thin films diblock copolymers having cylindrical microdomains oriented normal to with long-range lateral order were used. Solvent reconstruction followed glancing angle evaporation and thermal annealing, led decorations gold. These used as masks for pattern pores, columns, rings underlying substrate high fidelity.
Highly porous carbon-coated Si nanoparticles with canyon-like surfaces exhibit a stable cycle retention of 59.1% after 200 cycles because sufficient free volume for expansion upon lithiation from their unique and cavities formed MgO etching.
The oxidation states of vanadium determine its mobility and toxicity, dissimilatory vanadate reduction has been reported in several microorganisms, highlighting the potential significance this pathway remediation contamination biogeochemical cycle. However, to date, most known microorganisms capable reducing are Gram-negative respiratory bacteria belonging phylum Proteobacteria. In study, we isolated Tepidibacter mesophilus strain VROV1 from deep-sea sediments on northern Central Indian...
Perfluoroalkyl isocyanate-derived monolayers were prepared on oxidized aluminum surfaces by chemical vapor deposition (CVD) of 1H,1H,2H,2H-perfluorodecyl isocyanate (CF(3)[CF(2)](7)CH(2)CH(2)N horizontal lineC lineO, i.e., R(F)-NCO). Two types substrates studied: electrochemically polished plates (Al(Al(2))(O(3))) and Al(Al(2))(O(3)) that was treated with boiling water ((BW)Al(Al(2))(O(3))). X-ray photoelectron spectroscopy (XPS) atomic force microscopy (AFM) confirmed this CVD method...
The phase transitions of lithium perchlorate (LiClO4)- doped polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) were studied as a function temperature and ion salt concentration using in situ small-angle X-ray scattering (SAXS) transmission electron microscopy (TEM). Incorporation LiClO4 into an asymmetric, disordered PS-b-P2VP copolymer produced temperature-dependent order–disorder (ODT) order–order (OOTs) from spherical to lamellar microphases. effective interaction parameter (χeff) between...
4 V-operated all solid symmetrical supercapacitors that employ mixtures of various weight compositions with c-P<sub>4</sub>VPh and EMITFSI electrolytes have been demonstrated characterized.
Ni:Gd co-doped ceria (GNDC) was synthesized to thermally exsolve NiO nanoparticles and subsequently reduced a Ni nanocatalyst achieve high-performance SOFC despite low content (∼2 vol%).
The effect of casting solvent on the morphology sulfonated polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SSEBS) was investigated using transmission electron microscopy and small-angle X-ray scattering. Proton conductivities methanol permeabilities were measured related impact morphological changes is discussed. SSEBS transformed from a well-ordered lamellar to disordered structure as concentration MeOH in MeOH/THF mixtures increases.
We demonstrate a method to fabricate high-quality patterned micelle arrays using poly(styrene-b-4-vinylpyridine) (PS-b-P4VP) block copolymer. Long-range order of the PS-b-P4VP in hexagonal was induced by topographic grating patterns during solvent annealing. The size and row spacing copolymer created this way were uniform. By controlling thickness polymer on crests troughs patterns, we prepared having different sizes.
The battery shape is a critical limiting factor affecting foreseeable energy storage applications. In particular, deformable metal–air systems can offer low cost, flammability, and high capacity, but the fabrication of such batteries remains challenging. Here, it shown that shape‐reconfigurable‐material approach, in which components composed micro‐ nanoscale composites are assembled, suitable for constructing polymorphic batteries. By employing an aluminum foil adhesive carbon composite...
Abstract Cerium oxide nanoparticles (CeO 2 NPs, NM-212) are well-known for their catalytic properties and antioxidant potential, have many applications in various industries, drug delivery, cosmetic formulations. CeO NPs exhibit strong antimicrobial activity can be used to efficiently remove pathogens from different environments. However, knowledge of the toxicological evaluation is too limited support safe use. In this study, were orally administered Sprague Dawley rats 13 weeks at doses 0,...