A5040711824- Polymer Surface Interaction Studies
- Lipid Membrane Structure and Behavior
- Force Microscopy Techniques and Applications
- Adhesion, Friction, and Surface Interactions
- Surface Modification and Superhydrophobicity
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Advanced Sensor and Energy Harvesting Materials
- Electrohydrodynamics and Fluid Dynamics
- Carbon Dioxide Capture Technologies
- Advanced Polymer Synthesis and Characterization
- Chemical Looping and Thermochemical Processes
- Lubricants and Their Additives
- Electrowetting and Microfluidic Technologies
- Fluid Dynamics and Heat Transfer
- Fuel Cells and Related Materials
- Advanced Battery Materials and Technologies
- Osteoarthritis Treatment and Mechanisms
- Nanocomposite Films for Food Packaging
- biodegradable polymer synthesis and properties
- Advancements in Battery Materials
- Electrospun Nanofibers in Biomedical Applications
- Electrostatics and Colloid Interactions
- Electrochemical Analysis and Applications
- Microfluidic and Capillary Electrophoresis Applications
Ulsan National Institute of Science and Technology
2017-2025
Korea Electric Power Corporation (South Korea)
2014-2020
Korea Advanced Institute of Science and Technology
1997-2019
University of California, Santa Barbara
2011-2017
Pohang University of Science and Technology
2010-2013
We report the design of a bottle-brush polymer whose architecture closely mimics lubricating protein lubricin. Interaction forces, assessed using Surface Forces Apparatus (SFA), between two mica surfaces fully covered by demonstrate that adopts loop conformation giving rise to weak and long-range repulsive interaction force surfaces. Under high compression, stronger forces appear due strong compression grafted pendant chains polymer. When submitted shear, system shows extremely low...
Articular cartilage is a highly efficacious water-based tribological system that optimized to provide low friction and wear protection at both high loads (pressures) sliding velocities must last over lifetime. Although many different lubrication mechanisms have been proposed, it becoming increasingly apparent the performance of cannot be attributed single mechanism acting alone but on synergistic action multiple "modes" are adapted optimum as normal loads, shear stresses, rates change....
We review direct force measurements on a broad class of hydrophobic and hydrophilic surfaces. These have enabled the development general interaction potential per unit area, W(D) = -2γ(i)Hy exp(-D/D(H)) in terms nondimensional Hydra parameter, Hy, that applies to both interactions between extended This allows one quantitatively account for additional attractions repulsions not included well-known combination electrostatic double layer van der Waals theories, so-called...
Abstract Removal of gas bubbles from the electrode surface is practically important to maintain activity electrochemical evolution reactions. Conventionally, most studies have focused on development electrocatalysts and paid less attention bubble removal issues. Recently, it has been reported that attached can be readily eliminated by imparting extremely gas‐repellent properties (so‐called superaerophobicity) electrodes via controlling their nano/microstructure. However, this approach...
Chitosan, a load-bearing biomacromolecule found in the exoskeletons of crustaceans and insects, is promising biopolymer for replacement synthetic plastic compounds. Here, surface interactions mediated by chitosan aqueous solutions, including effects pH contact time, were investigated using forces apparatus (SFA). Chitosan films showed an adhesion to mica all tested ranges (3.0-8.5), achieving maximum value at 3.0 after time 1 h (Wad ~ 6.4 mJ/m(2)). We also weak or no cohesion between two...
The mobility and deposition of capped silver (Ag) nanoparticles (NPs) on silica surfaces were characterized over a wide range pH ionic strength (IS) conditions, including seawater freshwater. Two common organic capping agents (citrate PVP) evaluated. Both the Ag NPs negatively charged under these environmentally relevant resulting in net repulsive electrostatics most conditions. steric repulsion introduced by significantly reduced aggregation deposition. In addition, presence natural matter...
A simple modification of electrodes with hydrogel can facilitate hydrogen evolution reactions by readily eliminating gas bubbles.
Significance The goal of this study was to use the Surface Forces Apparatus examine effects slip-stick friction on cartilage surface morphology under different loading and sliding conditions. Different load speed regimes were represented using maps that separated smooth stick-slip sliding. finding work is damage generally occurs within not directly related coefficient. Prolonged exposure surfaces resulted in a significant increase roughness, indicative severe morphological changes (damage) surfaces.
Abstract The development of flexible electronic technology has led to convenient devices, including foldable displays, wearable, e‐skin, and medical increasing the need for adhesives that can quickly recover their shape while connecting components device. Conventional pressure sensitive (PSAs) improve recoverability via crosslinking, but often have poor adhesive strength. In this study, new types urethane‐based crosslinkers are synthesized using m ‐xylylene diisocyanate (XDI) or...
Owing to the rise in global population and living standards, waste treatment has inevitably become a critical issue for sustainable environment. In particular, an effective recycling process, it is vital disassemble different types of materials by removing adhesives used packaging. However, this removal process requires harsh solvents (acidic organic) that are unfriendly nature may cause additional pollution. To address issue, functional adhesive can be removed without use have drawn...
The review summarizes recent studies aimed at controlling the hydrophilic and hydrophobic microenvironments of electrodes, addressing gas–liquid–solid triphase challenges encountered in both gas-evolving gas-consuming reactions.
Rough/patterned/textured surfaces with nano/microcavities that broaden below the surface—known as "re-entrants"—can be omniphobic (macroscopic contact angle greater than 90° for both water and oils). The existing theoretical models explain effects of texture on wetting are complex do not provide a simple procedure predicting thermodynamically stable metastable states their corresponding angles (for example, involve partially filled cavities). Here, we develop simple-to-apply model allows (1)...
Wetting of rough surfaces involves time-dependent effects, such as surface deformations, nonuniform filling pores within or outside the contact area, and chemistries, but detailed impact these phenomena on wetting is not entirely clear. Understanding effects crucial for designing coatings a wide range applications, membrane-based oil-water separation desalination, waterproof linings/windows automobiles, aircrafts, naval vessels, antibiofouling. Herein, we report angles water droplets...
Abstract Marine mussels use catechol‐rich interfacial mussel foot proteins (mfps) as primers that attach to mineral surfaces via hydrogen, metal coordination, electrostatic, ionic, or hydrophobic bonds, creating a secondary surface promotes bonding the bulk mfps. Inspired by this biological adhesive primer, it is shown ≈1 nm thick catecholic single‐molecule priming layer increases adhesion strength of crosslinked polymethacrylate resin on up an order magnitude when compared with conventional...
We demonstrate the use of a supercritical fluid treatment for creating ionomer nanodispersions fuel cell cathodes.
Global warming due to greenhouse gases is an issue of great concern today. Fossil fuel power plants, especially coal-fired thermal are a major source carbon dioxide emission. In this work, capture and utilization using sodium hydroxide was studied experimentally. Application for flue gas plant considered. Carbon dioxide, reacting with aqueous solution hydroxide, could be converted bicarbonate (NaHCO3). A bench-scale unit reactor system designed experiment. The scale the 2 kg per day....
Poly(ethylene glycol) (PEG) has attracted significant interest because of its superior antifouling properties, water solubility, and biocompatibility. However, the translation properties onto target surfaces been challenging limited functionality. Herein, PEG-based block copolyethers functionalized with catechol, a mussel-inspired, versatile moiety for coating surfaces, were evaluated within framework polyethers exclusively. A series catechol-functionalized diverse molecular weights catechol...