A5103828280- Dielectric materials and actuators
- Carbon Nanotubes in Composites
- Graphene and Nanomaterials Applications
- Mechanical and Optical Resonators
- High voltage insulation and dielectric phenomena
- Nanowire Synthesis and Applications
- Polymer crystallization and properties
- Polymer Nanocomposites and Properties
- Nanoplatforms for cancer theranostics
- Nanoparticles: synthesis and applications
- Bone Tissue Engineering Materials
- Supercapacitor Materials and Fabrication
- Advanced biosensing and bioanalysis techniques
- Educational Systems and Policies
- Microplastics and Plastic Pollution
- Nanoparticle-Based Drug Delivery
- Gas Sensing Nanomaterials and Sensors
- Ion channel regulation and function
- Advanced Sensor and Energy Harvesting Materials
- Ion Channels and Receptors
- Antimicrobial agents and applications
- Vibration Control and Rheological Fluids
- Nanofabrication and Lithography Techniques
- Empathy and Medical Education
- Research Data Management Practices
Korea Institute of Science and Technology
2001-2021
Seoul National University
2013-2019
University of Pennsylvania
2011
Samsung (United States)
2005
Korea University
2005
University of Utah
1982-1989
This work describes the synthesis of silver/polyrhodanine-composite-decorated silica nanoparticles and their antibacterial activity. Polymerization polyrhodanine proceeded preferentially on surface where Ag+ ions were located. In addition, embedded reduced to form metallic Ag nanoparticles; consequently, silver/polyrhodanine-composite (approximately 7 nm in diameter) formed nanoparticles. The resulting nanostructure was investigated using electron microscopy, Fourier-transform infrared...
Until a century ago, Korean medicine was based mainly on Oriental philosophies and ideas. From religious perspective, Chinese Confucianism prevalent in Korea at that time. Since Confucianists believe it is against one's filial duty to harm his or her body, given them by their parents, most Koreans did not donate bodies organs for education the past. However, end of 20th century, unique fusion Western medicines were produced Peninsula, revolutionizing traditional perspectives human mortality,...
Highly fluorescent surface modified polyacrylonitrile nanoparticles (PAN NPs) of 50 nm diameter were fabricated for selective Cu2+ sensing. After modification, the PAN NPs converted to amidine/Schiff base dual-modified (tPAN with a sensing property and high QY (0.19). The selectivity tPAN is much higher than that other metal ions due fact amidine group on has binding affinity Cu2+. effect fluorescence intensity was also studied, showed low interference response in detection Furthermore, as...
Abstract Electrode slurry coatings on the current collector of a Li-ion battery suffer from high mass loading owing to severe floating binder during solvent drying. Atmospheric plasma pretreatment Cu forms functional group its surface, which hydroxyl bond with materials. However, foil transferred high-speed roll-to-roll machine undergoes displacement due wrinkling. This deteriorates uniformity process results and discharge stability. To overcome above-mentioned limitations, in this study, we...
Carbon nanotube field emission pixels with gate electrodes are reported to have been fabricated for the first time. The interesting electronic application of carbon nanotubes (CNTs) as electron emitters had not realized previously because difficulty achieving precisely controlled selective growth CNTs within a hole diameter ∼1 μm (see Figure).
Abstract Graphene oxide (GO) enwrapped SiO 2 /TiO hollow nanoparticles (GO‐HNP) are synthesized by the Stöber method and used as a nanocarrier for loading protoporphyrin IX (PpIX). The nanoparticle has high dispersibility uniformity in diameter (ca. 50 nm). Furthermore, this shows λ =808 nm laser induced PpIX release properties (photoinduced “on–off” drug‐release system). GO‐HNP‐PpIX is employed inducing both photothermal therapy (PTT) photodynamic (PDT). synergic effect of PTT PDT exhibits...
In this study, a 1D oriented hollow SiO<sub>2</sub>/TiO<sub>2</sub> (HST) rod-like material was successfully fabricated <italic>via</italic> sequential combination of sol–gel use, TiO<sub>2</sub> incorporation, and sonication-mediated etching redeposition method.
Electrophotorheological (EPR) fluids, whose rheological activity is dually responsive to light and electric fields (E fields), formulated by mixing photosensitive spiropyran-decorated silica (SP-sSiO2) nanoparticles with zwitterionic lecithin mineral oil. A reversible photorheological (PR) of the EPR fluid developed via binding releasing mechanism merocyanine (MC, a photoisomerized form SP) under ultraviolet (UV) visible (VIS) applications. Moreover, exhibits an 8-fold higher...
Multilayered magnetite-embedded core/shell silica/titania (SiO<sub>2</sub>/TiO<sub>2</sub>) nanoparticles with an outermost silica shell (SiO<sub>2</sub>/TiO<sub>2</sub>@Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>) were synthesized and used to develop stimuli-responsive smart fluids.
The mixed geometrical effect on the electrorheological (ER) activity of bimodal ER fluids was investigated by mixing SiO2 spheres and rods different dimensions. To gain an in-depth understanding effect, 12 were prepared from 4 sizes (50, 100, 150, 350 nm) 3 types with aspect ratios (L/D = 2, 3, 5). Five concentrations created for each fluid, resulting in a total 60 sets comprehensive measurements. Some exhibited enhanced performance, as high 23.0%, compared to single rod-based reveal fluids....
Inverted conducting polymer/metal oxide core/shell structured pPPy/SiO2-TiO2 nanoparticles were prepared as electrorheological (ER) materials using sequential experimental methods. The core was synthesized via the low-temperature self-assembly of PPy and SiO2 materials, outer TiO2 shell easily coated onto part a sol-gel method titanium isopropoxide precursor. Sonication-mediated etching redeposition employed to etch out portions from blend with shells. Each step in nanoparticle synthesis...
A feasible fabrication technique for nanomachines that are based on carbon nanotubes (CNTs) is demonstrated. Direct nanowiring of CNTs between micrometer islands reported to have been achieved by a growth barrier technique, which prevents vertical the CNTs, i.e., towards substrate. The result “straight” or “Y-shaped” CNT bridges predefined electrodes (see Figure).
The folic acid conjugated hollow nanosphere is used to encapsulate protoporphyrin IX and utilized for photodynamic therapy. This system represents a 3.33 times higher efficiency than previous IX-based systems. result proposes new opportunity effective therapy of folate receptor positive tumor cells.
Pristine, barium‐doped, and strontium‐doped hollow nanoparticles (p‐HNPs, Ba‐HNP, Sr‐HNP; HNPs) are prepared by sonication‐mediated etching redeposition (SMER) method alkali‐earth‐metal hydroxide solution treatment. The HNPs investigated to facilitate synergetic neuronal differentiation through doping in conjunction with nerve growth factor (NGF). PC12 cells used as model for differentiation. efficiency is improved the presence of HNPs+NGF, neurite length order Sr‐HNP+NGF > Ba‐HNP+NGF...
The lateral reduction of interconnection in nanoelectronics will require a one-dimensional metallic nanointerconnector. This work presents an achievement the all-chromium (Cr) nanointerconnection architecture, approach to nanointerconnection, which both electrodes and connecting lines are realized by same Cr using autocatalytic function without any additional lithography. Especially observed was time evolution directional growth nanowires dc electric field during situ nanowires. Finally, it...
Abstract The dielectric and viscoelastic relaxation behavior of linear low‐density polyethylene has been investigated. All three usual regions occur; however, the α process is more dominant than in conventional made dielectrically active through introduction carbonyl groups. observed very sensitive to orientation morphology. There are significant differences between oriented samples (stretching or extrusion) a single‐crystal texture specimen. Effects caused by dipolar immobilization,...
Abstract Dielectric relaxation studies have been used as a means of investigating the behavior aromatic molecules dissolved in semicrystalline polymer. All show vicinity γ loss peak polyethylene, while several an additional at lower temperatures. The latter is interpreted indicator molecular motions below glass transition and former to be associated with onset on local scale approached. α process polyethylene seemingly unaffected by presence molecules. Integration curves shows that, most,...
Abstract The dielectric loss behavior of crosslinked polyethylene has been determined over the frequency range 10–5 kHz and temperature −150 to 100°C. Major effects occur at lower temperatures are caused by libration organic byproducts crosslinking agent, dicumyl peroxide. Analog materials prepared from linear low density blending in either acetophenone or 2‐phenyl‐2‐propanol confirm hypothesis. concentration products orientation polymer have studied. Activation energy analyses suggest that...
Abstract Neuronal differentiation promoted by protein delivery is a promising strategy for the treatment of neuropathies. Herein, alkaline earth metal (AEM)‐doped hollow nanoparticles (HNPs) are utilized simultaneous ions and nerve growth factor (NGF) toward cell interiors via endocytosis. Various AEMs including Mg, Ca, Sr, Ba readily doped onto HNPs resulting AEM‐HNPs serve as NGF agents. Benefiting from morphology, NGFs successfully loaded into to obtain NGF‐loaded N+AEM‐HNPs. These...
The purpose of this study is to introduce the Rasch-tree, which Rasch model-based recursive partitioning, as a new method for differential item functioning(DIF) detection and examine its usefulness by exploring DIF in PISA 2015 Science test data with Rasch-tree. This used 16 items binary response 41 variables related student, parent, family, teacher, science, ICT. results showed that there are four subgroups splitted three variables, ‘Enjoyment Science(JOYSCICE)’, ‘gender’, ‘Child’s past...