A5013509339- Polymer composites and self-healing
- Electrospun Nanofibers in Biomedical Applications
- Advanced Sensor and Energy Harvesting Materials
- Surface Modification and Superhydrophobicity
- Conducting polymers and applications
- Smart Materials for Construction
- Membrane Separation Technologies
- Electrohydrodynamics and Fluid Dynamics
- High-Temperature Coating Behaviors
- Flame retardant materials and properties
- Mechanical Behavior of Composites
- Fiber-reinforced polymer composites
- Graphene research and applications
- Supercapacitor Materials and Fabrication
- Corrosion Behavior and Inhibition
- Advanced Photocatalysis Techniques
- Electrowetting and Microfluidic Technologies
- Additive Manufacturing and 3D Printing Technologies
- Surface Chemistry and Catalysis
- Advancements in Battery Materials
- Carbon Nanotubes in Composites
- Fluid Dynamics and Heat Transfer
- Advanced Battery Materials and Technologies
- Crystallography and molecular interactions
- Advanced Wireless Network Optimization
Korea Institute of Science and Technology
2017-2024
Korea University
2010-2021
Government of the Republic of Korea
2018
Chung-Ang University
2017-2018
University of Illinois Chicago
2015-2017
Hanyang University
2015-2016
Anyang University
2016
Baylor University
2014
King Saud University
2014
City University of New York
2013
The ability to prepare solid surfaces with well-controlled superhydrophobic and superoleophilic properties is of paramount importance water–oil separation technology. Herein, we successfully prepared superhydrophobic-superoleophilic membranes by single-step deposition polystyrene (PS) nanofibers onto a stainless steel mesh via electrospinning. contact angles diesel water on the PS nanofiber membrane were 0° 155° ± 3°, respectively. Applications toward separating liquids low surface tension,...
Dual emulsion electrospinning is introduced to form core–shell nanofiber coatings with the self-healing agent dimethyl siloxane (DMS) and dimethyl-methyl hydrogen-siloxane (cure) separately in cores. The coating pores are also intercalated by polymerized (cured) poly(dimethyl siloxane) (PDMS) resin as an outer matrix. If such a damaged, agents (DMS cure) released from cores mixed. As result, mixture of DMS cure inside scratch or micro-crack, surrounding PDMS matrix self-healed. By direct...
Self-healing microfibers with core-shell geometry were studied. A commercial binary epoxy was encased in solution-blown polymer nano-/microfibers the 0.2-2.6 μm diameter range. The formed by coaxial nozzles, which encapsulated resin and its hardener separate cores. Solution blowing, fiber-forming process used this work, at least 30 times faster than electrospinning method previously has already been scaled up to industrial level. These show self-healing capability, are released from cores of...
Coaxial electrospinning was used to fabricate two types of core-shell fibers: the first type with liquid resin monomer in core and polyacrylonitrile shell, second curing agent shell. These fibers were mutually entangled embedded into flexible transparent matrices thus forming self-healing composite materials. Such materials could be formed before only using emulsion electrospinning, rather than coaxial electrospinning. The properties such are associated release healing agents (resin cure)...
In this work, we developed novel self-healing anticorrosive hierarchical coatings that consist of several components. Namely, as a skeleton prepared core–shell nanofiber mat electrospun from emulsions cure material (dimethyl methylhydrogen siloxane) in poly(acrylonitrile) (PAN) solution dimethylformamide. these nanofibers, is the core, while PAN shell. The deposited on protected surface encased an epoxy-based matrix, which contains emulsified liquid droplets dimethylvinyl-terminated...
The present work contains the results of experiments with two tiny drops on partially wettable substrates contact angles 10°, 24°, 27°, and 56°, which coalesce in regime entirely dominated by viscous forces. Both side bottom views are examined. for these three-dimensional coalescence flows compared scaling laws numerical two-dimensional model developed work.
The present work aims at development of self-healing materials capable partially restoring their mechanical properties under the conditions prolonged periodic loading and unloading, which is characteristic, for example, aerospace applications. Composite used in these many other applications frequently reveal multiple defects stemming from original inhomogeneity, facilitates microcracking delamination ply interfaces. Self-healing nanofiber mats may effectively prevent such damage without...
Experiments were conducted to measure the performance of direct-current-pulsed electrohydrodynamic drop formation as a function liquid viscosity, electrical conductivity, and surface tension. While hydrodynamic charge relaxation times Taylor cone frequencies suggest theoretical drop-generation well in excess 100 Hz, we show that it is impossible produce more than 50 drops per second with decreasing viscosity increased or conductivity decreased (and not significant tension). Instead relying...
The 20–50 nm nanofibers hold great promise as functional fabrics, biomedical materials, filters, fuel cell membranes, ultra-speed fiber optics, electronics and sensorics. In our novel process of supersonic solution blowing nylon-6, are obtained. Here we found a new phase which differs from the known α-, β-, γ-, δ- λ-phases, presenting itself χ-phase. It is characterized by decrease CH2 stretching, shift –NH different type hydrogen bond ten-fold increase in Young's modulus compared to those...
The capacity for core–shell nanofiber mats containing healing agents (resin monomer and cure) in their cores to adhere a substrate was studied using blister testing. After extended periodic bending, the adhesion energy measured, effect of self-healing on composite's delamination from considered. In addition, cohesion two layers nanofibers examined testing compared that ordinary mats. damage inflicted by prolonged bending interface demonstrated have self-healed, measured.
Carbon fiber-reinforced plastic (CFRP) composites are widely employed in lightweight and high performance applications including supercars, aero-vehicles, space components. However, although carbon fibers thermally stable, the low thermal endurance of matrix materials remains a critical problem terms material. In this study, we proposed new, Al2O3-based barrier coating (TBC) for CFRP composites. The TBC comprised α-phase Al2O3 particles with mean diameter 9.27 μm. strong adhesion between...
Lanthanum cerium oxide (La2Ce2O7, LC) is one of the emerging ceramic thermal barrier coatings (TBC) owing to its low conductivity and a high coefficient expansion compared with conventional yttria-stabilized zirconia (YSZ). This review summarizes powder production, thermophysical properties, coating processes, durability, mitigation against calcium magnesium alumino-silicate attack volcanic ash, high-temperature corrosion, doping other rare-earth oxides enhance their properties performance....
Electrospinning is a simple and highly versatile method for the large-scale fabrication of polymeric nanofibers. Additives or fillers can also be used to functionalize nanofibers use in specific applications. Herein, we demonstrate novel efficient way fabricate superhydrophobic hydrophilic tunable mats with combined electrospinning electrospraying that may suitable mass production on merits rapid deposition. The nanocomposite were comprised hydrophobic polystyrene titania nanoparticles. When...
Here, we studied the self-healing of composite materials filled with epoxy-containing nanofibers. An initial incision in middle a sample stretched static fatigue test can result either crack propagation or healing. In this study, evolution was observed real time. A binary epoxy, which acted as agent, encapsulated two separate types interwoven nano/microfibers formed by dual-solution blowing, core containing epoxy hardener and shell being from poly(vinylidene fluoride)/ poly(ethylene oxide)...