A5031724160- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Advanced Sensor and Energy Harvesting Materials
- Surface Modification and Superhydrophobicity
- Conducting polymers and applications
- Adhesion, Friction, and Surface Interactions
- Advanced battery technologies research
- Nanofabrication and Lithography Techniques
- Membrane-based Ion Separation Techniques
- Advanced Materials and Mechanics
- Tactile and Sensory Interactions
- Nanomaterials and Printing Technologies
- Perovskite Materials and Applications
- Fluid Dynamics and Mixing
- Polymer Surface Interaction Studies
- Quantum Dots Synthesis And Properties
- Electrowetting and Microfluidic Technologies
- Advanced Battery Materials and Technologies
- Supercapacitor Materials and Fabrication
- Modular Robots and Swarm Intelligence
- Force Microscopy Techniques and Applications
- 3D Printing in Biomedical Research
- Fluid Dynamics and Thin Films
- Fluid Dynamics and Turbulent Flows
- Transition Metal Oxide Nanomaterials
Incheon National University
2016-2024
Andong National University
2023
Ton Duc Thang University
2018-2021
Seoul National University
2001-2020
Government of the Republic of Korea
2017-2020
Incheon Medical Center
2019-2020
Frontier Energy (United States)
2016
Kim Il-sung University
2014
Doosan Heavy Industries & Construction (South Korea)
2011-2012
Pusan National University
2006-2010
By employing the neutral plane concept, we demonstrated ultra-flexible perovskite solar cells that can withstand 100 cycles of crumpling.
We present a simple method for the fabrication of robust superomniphobic surfaces with high transmittance (>90%) and durability (<6 months). The consists direct micromolding mushroom-like micropillars C4F8 gas surface treatment. Such re-entrant structures were found to be highly resistant against wetting by various liquids oils wide range tensions from 22.3 (ethanol) 72.1 mN m−1 (water). Optimal structural parameters derived based on measurements static contact angle hysteresis.
Recently, a mechanical crack-based strain sensor with high sensitivity was proposed by producing free cracks via bending metal coated film known curvature. To further enhance and controllability, guided crack formation is needed. Herein, we demonstrate such ultra-sensitive based on the of straight cracks. The has patterned holes surface device, which concentrate stress near leading to generate uniform connecting throughout surface. We found that resulted in an exponential dependence...
Sensors to detect motion with high precision have been extensively studied in diverse engineering research fields.
Abstract The production of multiscale architectures is significant interest in materials science, and the integration those structures could provide a breakthrough for various applications. Here we report simple yet versatile strategy that allows LEGO-like integrations microscale membranes by quantitatively controlling oxygen inhibition effects ultraviolet-curable materials, leading to multilevel architectures. spatial control concentration induces different curing contrasts resin allowing...
Abstract Inspired by the human brain, quest for high‐performing neuromorphic architecture has recently gained more attention, which can be achieved two‐terminal memristors. However, due to random and uncontrolled filament formation during a typical switching process, conventional memristors suffer from severe shortcomings such as temporal/spatial reproducibility well trivial sensitivity against applied spikes, however all these properties are crucial accurate quick information processing....
A reversible interlocker that is inspired by the wing locking device of beetles presented. It exploits van der Waals force-assisted binding between high-aspect-ratio polymer fibers. The two-layered highly flexible and displays an extremely high shear force easy normal lift-off.
A simple method is presented to form an array of shape-controllable microlenses by partial photocuring UV-curable polymer and direct transfer. Using the transferred lens array, nanoscale metal patterns as small 130-nm gaps are detected under optical microscope with a distinguishable resolution.
We present a mechanical crack-based strain sensor with metal films by introducing an inter-layer. Two inter-layers are used; Cr layer is for generating cracks and MoO<sub>3</sub>layer enhancing the adhesion between substrate layer.
A multiscale architectured solid oxide fuel cell is demonstrated by applying a large-area ceramic micropatterning and thin-film deposition processes.
Abstract We have achieved performance enhancement of polymer electrolyte membrane fuel cell (PEMFC) though crack generation on its electrodes. It is the first attempt to enhance PEMFC by using cracks which are generally considered as defects. The pre-defined, cracked electrode was generated stretching a catalyst-coated Nafion membrane. With strain-stress property that unique in aspect plastic deformation, assembly (MEA) successfully incorporated into cell. Cracked electrodes with variation...
Abstract Guided cracks were successfully generated in an electrode using the concentrated surface stress of a prism-patterned Nafion membrane. An with guided was formed by stretching catalyst-coated The morphological features stretched membrane assembly (MEA) investigated respect to variation prism pattern dimension (prism pitches 20 μm and 50 μm) applied strain ( S ≈ 0.5 1.0). behaviour water on cracked examined environmental scanning electron microscopy. layer shown be efficient reservoirs...
In mechanical sensory systems, encapsulation is one of the crucial issues to take care when it comes protection systems from external damage. Recently, a new type strain sensor inspired by spider’s slit organ has been reported, which incredibly high sensitivity, flexibility, wearability, and multifunctional sensing abilities. spite many these advantages, still vulnerable in harsh environments liquids and/or temperature, because heat-vulnerable polyethylene terephthalate (PET) substrate...
The capability of fabricating multiscale structures with desired morphology and incorporating them into engineering applications is key to realizing technological breakthroughs by employing the benefits from both microscale nanoscale simultaneously. Here, we developed a facile patterning method fabricate hierarchical novel approach called creep-assisted sequential imprinting. In this work, nanopatterning was first carried out thermal imprint lithography above glass transition temperature...
This study presents wet-responsive, shape-reconfigurable, and flexible hydrogel adhesives that exhibit strong adhesion under wet environments based on reversible interlocking between reconfigurable microhook arrays. The experimental investigation the swelling behavior structural characterization of microstructures reveal arrays undergo anisotropic shape transformation upon contact with water. interlocked is greatly enhanced conditions because hydration-triggered reconfiguration...
The recent development of ultrathin anion exchange membranes and optimization their operating conditions have significantly enhanced the performance alkaline-membrane fuel cells (AMFCs); however, effects membrane/electrode interface structure on AMFC not been seriously investigated thus far. Herein, we report a high-performance system with novel design. Commercially available are modified in form well-aligned line arrays both anode cathode sides by means solvent-assisted molding technique...
Development of a novel flow-field design for improving the water management proton exchange membrane fuel cells (PEMFCs) is critical realizing practical high-performance energy conversion system. The conventional serpentine designs with two-dimensional channel and rib configuration often cause accumulation, thus blocking transport reactants interfering removal water, which in turn result reduced cell performance at high current densities. In this work, hydrophilic polymer grafting into...