A5064245670- Surface Modification and Superhydrophobicity
- Acoustic Wave Resonator Technologies
- Semiconductor materials and devices
- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Oil Spill Detection and Mitigation
- Advanced Sensor and Energy Harvesting Materials
- biodegradable polymer synthesis and properties
- GaN-based semiconductor devices and materials
- Hydrogels: synthesis, properties, applications
- Polymer Nanocomposites and Properties
- Analytical Chemistry and Sensors
- Electrospun Nanofibers in Biomedical Applications
- Membrane Separation Technologies
- Electrohydrodynamics and Fluid Dynamics
- Electrostatics and Colloid Interactions
- Network Security and Intrusion Detection
- Recycling and Waste Management Techniques
- Electrochemical Analysis and Applications
- Metal and Thin Film Mechanics
- Innovative Microfluidic and Catalytic Techniques Innovation
- Integrated Circuits and Semiconductor Failure Analysis
- Plasma Diagnostics and Applications
- Advanced biosensing and bioanalysis techniques
- Biosensors and Analytical Detection
Jeonbuk National University
2020-2024
Ulsan University Hospital
2008-2022
Pohang University of Science and Technology
2018-2021
Pennsylvania State University
1994-2019
Park University
2018
University of Ulsan
1996-2013
Ulsan College
2008-2013
Kookmin University
2011
Sungkyunkwan University
2006-2010
Korea Institute of Industrial Technology
2001-2009
Abstract A general anion‐sensing platform is reported based on a portable and cost‐effective ion‐selective optode smartphone detector equipped with color analysis app. In contrast to traditional anion‐selective optodes using hydrophobic polymer and/or plasticizer dissolve sensing elements, the new relies hydrophilic cellulose paper. The anion ionophore lipophilic pH indicator are inkjet‐printed adsorbed paper form “dry” layer. Porous sheets also allow site be modified dried buffer that...
Currently, hindered phenol (HP) antioxidants mixed in PP products provide thermal-oxidative protection during melt processing (homogeneous mixing). However, there are concerns about their effectiveness applications. This paper presents computer simulation and experimental results to demonstrate a facile phase separation of HP molecules the matrix investigates new approach that can dramatically improve stability under elevated temperatures. technology is centered on PP–HP copolymer containing...
The objective of this research is to develop a practical and efficient oil recovery method that can be applied in large-scale crude spills open water. centered on newly developed polyolefin superabsorbent, called "i-Petrogel", conjunction with existing mechanical (skimmer) method. i-Petrogel absorbent produced large scale (>90 kg our laboratory) by mixing two polymers, including semicrystalline linear low-density polyethylene (LLDPE) thermoplastic thermally cross-linkable...
The water and small molecule uptake behavior of amphiphilic diacrylate terminated poly(dimethylsiloxane) (PDMSDA)/poly(ethylene glycol diacrylate) (PEGDA) cross-linked hydrogels were studied using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. These hydrogel networks absorbed more as the PEGDA content network increased. In contrast to typical osmotic deswelling that occurs when liquid equilibrated are immersed in solutions with activities less than unity,...
Despite the recent development in various materials capable of encapsulating biomolecules, there exist limited reports on multicomponent encapsulation biocompatible microcapsules. In this letter, we utilize molecular weight dependent solubility poly(ethylene glycol) diacrylate (PEGDA) and droplet microfluidics to achieve direct both hydrophilic hydrophobic cargoes PEG By using PEGDA 250 as middle phase, demonstrate that these PEGDA-based microcapsules allow simultaneous cargoes. We further...
We discuss a new class of polymer absorbents called "petrogels", polyolefin-based hydrophobic that demonstrate selective absorption hydrocarbon (oil) molecules in water, counterpart to "hydrogels" are known for absorbing aqueous solutions. To understand the effects molecular structure (i.e., composition, cross-linking density, and morphology) capacity with various hydrocarbons mixtures, systematical study was conducted involving polyolefin copolymers exhibit highly swellable network but no...
Abstract A hydrogel microcapsule with an intermediate thin oil layer is presented to achieve smart release of a broad range cargoes triggered via diverse stimuli. microfluidic technique used produce triple emulsion droplets that separates the innermost aqueous phase from prepolymer phase, which transforms into shell photopolymerization. The within acts as effective diffusion barrier, allowing encapsulation various small porous until stimulus applied destabilize layer. It demonstrated stimuli...
Despite its commercial success, isotactic polypropylene (PP) is not suitable for the applications that require long-term exposure to high-energy conditions, such as elevated temperatures, UV radiation, or high electric fields, due combination of polymer chain oxidative degradation, incompatibility with polar additives (antioxidants, stabilizers, etc.), and low material softening temperature. This paper presents a new solution can simultaneously address both chemical physical limitations. The...
Abstract The conservation of ocean and freshwater have been crucial issues over the past decades, oil/water separation is a well‐known technology to restore polluted water systems. In meantime, oil sorbents serve as promising means achieving recover from spills, which require multi‐factorial approach review high selectivity, capacity, rate recovery. However, reusability critical component consider in incidents with large‐scale spills. With development sorbent technology, some studies...
N-(2-Hydroxy)propyl-3-trimethylammonium chitosan chloride (HTCC) was synthesized by the reaction of glycidyltrimethylammonium (GTMAC) and chitosan. The product a water-soluble derivative, showed excellent antimicrobial activity. HTCC blended with polyacrylonitrile (PAN) using an NaSCN aqueous solution as common solvent. blend transparent stable up to 6 months without phase separation. PAN/HTCC fibers were prepared via wet spinning drawing process. Thermal, electrical, mechanical properties...
Aqueous two-phase systems (ATPSs) have been widely used in the separation, purification, and enrichment of biomolecules for their excellent biocompatibility. While ultracentrifugation microfluidic devices combined with ATPS to facilitate separation achieve high recovery yields, they often lack ability effectively isolate separate low concentrations. In this work, we present a strategy that leverages preferential partitioning droplets efficiently model extracellular vesicle (EV) particles. We...
Elastomer-based piezoresistive sensors are an impactful and promising means of monitoring biological motion, tracking biosignals, measuring the mechanical collision physical stimuli in robots or machines. Piezoresistive behavior is generally realized when conductivity imparted to elastomers, which results resistivity changes by external force that induces elastic deformations. elastomer can be achieved mixing coating with a conductive material, thereby forming composite structure. In this...
Abstract Three‐dimensional architecture of segregated network can significantly influence thermal behaviors polymer composites, such as the melting temperature (T m ) and degradation temperature. However, there have been few systematic studies on polypropylene (PP) composites with a that fillers were selectively located in polymeric particle interfaces. In this study, we found introduction graphene nanoplatelet (GNP) induced maximum T 177.6°C, extending operating by 11.5°C compared to...
Abstract A water‐soluble chitosan derivative of N ‐(2‐hydroxy)propyl‐3‐trimethylammonium chloride (HTCC), synthesized by the reaction and glycidyltrimethyl ammonium chloride, polyacrylonitrile (PAN) were blended using 46% (w/w) NaSCN aqueous solution as a common solvent. The total polymer concentration blend was fixed at 12% (w/w), relative composition PAN/HTCC in varied from 0/100 to 80/20 weight. fibers with appropriate physical property prepared wet spinning drawing process. effect HTCC...