A5045800916- Liquid Crystal Research Advancements
- Membrane Separation Technologies
- Membrane-based Ion Separation Techniques
- Surfactants and Colloidal Systems
- Photonic Crystals and Applications
- Photochromic and Fluorescence Chemistry
- Synthesis and properties of polymers
- Advanced Materials and Mechanics
- Fuel Cells and Related Materials
- Polymer Surface Interaction Studies
- Ionic liquids properties and applications
- Synthesis and Properties of Aromatic Compounds
- Molecular spectroscopy and chirality
- Photochemistry and Electron Transfer Studies
- Plant Reproductive Biology
- Photonic and Optical Devices
- biodegradable polymer synthesis and properties
- Surface Modification and Superhydrophobicity
- Nanocomposite Films for Food Packaging
- Electrowetting and Microfluidic Technologies
- Membrane Separation and Gas Transport
- Block Copolymer Self-Assembly
- Extraction and Separation Processes
- Adhesion, Friction, and Surface Interactions
- Advancements in Photolithography Techniques
Dong-A University
2015-2024
Government of the Republic of Korea
2015-2019
Seoul National University
2007-2015
Samsung (South Korea)
2004-2015
Soongsil University
2012
A series of copolymers [PCD#s, where # is the weight percentage dopamine methacrylamide (DMA) in polymers] containing mussel-inspired hydrophilic and plant-based hydrophobic cardanol moieties was prepared via radical polymerization using DMA 2-hydroxy-3-cardanylpropyl methacrylate (HCPM) as monomers. PCD#s were used coating materials to prevent flux decline membranes caused by adhesion biofoulants oil-foulants. Polysulfone (PSf) ultrafiltration coated with showed higher biofouling resistance...
Star-shaped polymers were prepared by atom transfer radical polymerization (ATRP) using poly(ethylene glycol) methyl ether methacrylate (PEGMA) and (MMA) as monomers polyhedral oligomeric silsesquioxane (POSS) a core material. Linear copolymers from PEGMA MMA also for comparison purposes. Polysulfone (PSf) ultrafiltration membranes coated with the star-shaped polymer showed larger fouling resistance flux recovery than those linear-shaped polymer. The improved antifouling properties of...
Polyamide reverse osmosis (RO) membranes with deposited carbon nanotubes (CNTs) coated poly(vinyl alcohol) (PVA) on the surface were prepared by interfacial polymerization followed deposition of oxidized CNTs and coating PVA surface. The polyamide membrane (PA–CNT–PVA membrane) showed much improved mechanical properties durability compared without (PA membrane). PA–CNT–PVA also exhibited better antifouling than PA commercial RO (LFC-1). antibiofouling performances possible when...
Amphiphilic organic/inorganic hybrid star-shaped polymers (SPP) were prepared by atom transfer radical polymerization (ATRP) using poly(ethylene glycol) methyl ether methacrylate (PEGMA) and 3-(3,5,7,9,11,13,15-heptacyclohexyl-pentacyclo[9.5.1.1³,⁹.1⁵,¹⁵.1⁷,¹³]-octasiloxane-1-yl)propyl (MA-POSS) as monomers octakis(2-bromo-2-methylpropionoxypropyldimethylsiloxy)-octasilsesquioxane (OBPS) an initiator. Star-shaped (SPM) having PEGMA (MMA) moieties also for comparative purposes. Polysulfone...
The study determined the effect of incorporating Momordica charantia leaf powder (MCLP) into corn-starch 3D food-printing ink as a functional ingredient. effects particle size (75, 131, and 200 μm) quantity MCLP on printing performance, structural, textural, rheological properties corn starch gel were evaluated with different concentrations (5, 10, 15 % (w/w)) starch. viscoelastic food inks considering their behavior during extrusion self-recovery after printing. Scanning electron microscope...
A novel means of layer-by-layer deposition (LbL) polyelectrolyte multilayers on three-dimensionally porous inverse opal (3D-IO) structures is presented. The 3D-IO comprising UV-curable polymer are highly flexible and can be readily demonstrated as free-standing films with double-sided open porosity over a large scale. conflict between the intrinsically hydrophobic polymeric waterborne characteristics LbL process overcome by employing mixed solvent system water alcohol. pH assembly strongly...
Star-shaped polymers (SPCs) containing poly(ethylene glycol) (PEG) and renewable cardanol side groups were synthesized by atom transfer radical polymerization (ATRP). Water-soluble SPCs turned into water-insoluble materials self-cross-linking reaction of the unsaturated hydrocarbon chains moieties upon UV irradiation. The SPC-coated membranes with curing exhibited noticeably higher bio- oil-fouling resistance than bare polysulfone (PSf) membrane during filtration experiments, whereas without...
We investigated the effect of change in alkyl chain length cation tributylalkylphosphonium 3-sulfopropyl methacrylate ([P444#][C3S], # = 4, 6, and 8) ionic liquids (ILs) on their osmolality recovery properties as draw solute forward osmosis (FO) process. The ILs aqueous solutions exhibited a characteristic lower critical solution temperature (LCST)-type phase separation, which allowed for easy or clean water from diluted solution. LCSTs 31, 26, 22, 18 °C were obtained 2.5, 5.0, 7.5, 10.0 wt%...
Abstract We synthesized a series of n ‐alkylthiomethyl‐substituted polystyrenes (#T‐PS, # = 4, 8, 12, and 16) ‐alkylsulfonylmethyl‐substituted (#S‐PS, 16), where is the number carbon atoms in ‐alkyl side group polymers, using polymer analogous reactions to investigate their liquid crystal (LC) alignment properties. In general, LC cell fabricated film having longer group, thioether linkage higher molar content showed homeotropic behavior with pretilt angle about 90°. The was well correlated...
A series of star-shaped block (SBC) and random (SRC) copolymers containing poly(ethylene glycol) methyl ether methacrylate (PEGMA) (MMA) moieties were prepared by atom transfer radical polymerization (ATRP), used as membrane coating materials to investigate the effects polymer structure monomer content on antifouling properties membranes. Polysulfone (PSf) ultrafiltration membranes coated with SBCs showed noticeably higher bio- oil-fouling resistance than bare PSf membrane. In addition,...
A nanocolander network is developed by embedding mesoporous block copolymers inside the structural frame of a macroporous inverse-opal structure. Spontaneously formed macroconduits interconnecting macropores are utilized as internal bypasses for enhancing bulk transport properties. demonstrative application membrane perfect size-selectivity nanoparticle separation without compromising high permeability transporting medium.
ABA-triblock copolymers were prepared <italic>via</italic> ATRP, using modified perfluoropolyether (PFPE) as a macroinitiator (Br–PFPE–Br) to form the B block, and 2-hydroxy-3-cardanylpropyl methacrylate (HCPM) monomer A blocks.
A poly(ionic liquid) having lower critical solution temperature characteristics was synthesized to investigate its suitability as a draw solute for forward osmosis.
The applicability of ionic liquids (ILs) as the draw solute in a forward osmosis (FO) system was investigated through study on effect structural change anion FO performance. This evaluated ILs composed tetrabutylphosphonium cation ([P4444]+) and benzenesulfonate ([BS]-), para-position alkyl-substituted anions (p-methylbenzenesulfonate ([MBS]-) p-ethylbenzenesulfonate ([EBS-]), methanesulfonate ([MS]-). analysis thermo-responsive properties suggested that [P4444][MBS] [P4444][EBS] have lower...