A5080502670- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Supercapacitor Materials and Fabrication
- Advanced Battery Materials and Technologies
- Metamaterials and Metasurfaces Applications
- Advancements in Battery Materials
- Advanced Materials and Mechanics
- Polymer Surface Interaction Studies
- Electrospun Nanofibers in Biomedical Applications
- Nanocluster Synthesis and Applications
- Liquid Crystal Research Advancements
- Bone Tissue Engineering Materials
- Advanced Battery Technologies Research
- Calcium Carbonate Crystallization and Inhibition
- Supramolecular Self-Assembly in Materials
- Block Copolymer Self-Assembly
- Polymer Nanocomposites and Properties
- Micro and Nano Robotics
- Polymer composites and self-healing
- Fluid Dynamics and Thin Films
- Nanofabrication and Lithography Techniques
- Metal Extraction and Bioleaching
- Proteins in Food Systems
- Advanced battery technologies research
- Plasmonic and Surface Plasmon Research
Hanyang University
2018-2025
Anyang University
2018-2023
Myongji University
2015-2018
University of Michigan
2011-2017
BioSurfaces (United States)
2015
Seoul National University
2005-2011
Chiral nanostructures from metals and semiconductors attract wide interest as components for polarization-enabled optoelectronic devices. Similarly to other fields of nanotechnology, graphene-based materials can greatly enrich physical chemical phenomena associated with optical electronic properties chiral facilitate their applications in biology well areas. Here, we report that covalent attachment l/d-cysteine moieties the edges graphene quantum dots (GQDs) leads helical buckling due...
Enzyme inhibitors are ubiquitous in all living systems, and their biological inhibitory activity is strongly dependent on molecular shape. Here, we show that small zinc oxide nanoparticles (ZnO NPs)—pyramids, plates, spheres—possess the ability to inhibit of a typical enzyme β-galactosidase (GAL) biomimetic fashion. inhibition by ZnO NPs reversible follows classical Michaelis–Menten kinetics with parameters geometry. Diverse spectroscopic, biochemical, computational experimental data...
Interconnectivity of components in three-dimensional networks (3DNs) is essential for stress transfer hydrogels, aerogels, and composites. Entanglement nanoscale the network relies on weak short-range intermolecular interactions. The intrinsic stiffness rod-like geometry limit cohesive energy physical crosslinks 3DN materials. Nature realizes networked gels differently using with extensive branching. Branched aramid nanofibers (BANFs) mimicking polymeric biological were synthesized to...
Chirality of plasmonic films can be strongly enhanced by three-dimensional (3D) out-of-plane geometries. The complexity lithographic methods currently used to produce such structures and other utilizing chiral templates impose limitations on spectral windows chiroptical effects, the size substrates, hence, further research plasmonics. Here we demonstrate 3D nanostructures (CPNs) with high optical activity in visible range based initially achiral nanopillars from ZnO. We made asymmetric gold...
Chiroptical materials found in butterflies, beetles, stomatopod crustaceans, and other creatures are attributed to biocomposites with helical motifs multiscale hierarchical organization. These structurally sophisticated self-assemble from primitive nanoscale building blocks, a process that is simpler more energy efficient than many top-down methods currently used produce similarly sized three-dimensional materials. Here, we report molecular-scale chirality of CdTe nanoparticle surface can be...
Abstract Nacre-like composites have been investigated typically in the form of coatings or free-standing sheets. They demonstrated remarkable mechanical properties and are used as ultrastrong materials but macroscale fibres with nacre-like organization can improve even further. The fiber nacre can, simplify manufacturing offer new functional unknown yet for other forms biomimetic materials. Here we demonstrate that be produced by shear-induced self-assembly nanoplatelets. synergy between two...
For the development of wearable electronics, replacement rigid, metallic components with fully elastomeric materials is crucial. However, current electrodes suffer from low electrical conductivity and poor stability. Herein, a metal-like conductive elastomer exceptional performance stability presented, which used to fabricate electronics. The key feature this material its wrinkled structure, induced by in situ cooperation solvent swelling densely packed nanoparticle assembly. Specifically,...
Hydrogels have diverse chemical properties and can exhibit reversibly large mechanical deformations in response to external stimuli; these characteristics suggest that hydrogels are promising materials for soft robots. However, reported actuators based on generally suffer from slow speed and/or poor controllability due intrinsic material limitations electrode fabrication technologies. Here, we report a hydrogel actuator operates at low voltages (<3 volts) with high performance (strain...
Chiral metamaterials have received significant attention due to their strong chiroptical interactions with electromagnetic waves of incident light. However, the fabrication large-area, hierarchically manufactured chiral plasmonic structures high dissymmetry factors (g-factors) over a wide spectral range remains key barrier practical applications. Here we report facile yet efficient method fabricate hierarchical nanostructures large area (>11.7 × 11.7 cm2) and g-factors (up 0.07 in visible...
Nanoscale polymeric fibers are expected to bring about exceptional mechanical and optical properties in composite materials related the better integration of different between polymers. The discovery first aramid nanofiber dispersion from commercial para-aramid macrofibers similar Kevlar® developed by DuPont allowed emergence an innovative nanoscale building block with great potential for engineering novel high-performance polymer nanocomposites. Here we report fabrication...
Energy-harvesting devices such as piezoelectric and triboelectric nanogenerators (NGs), which can convert mechanical energy into electricity, are under development to be combined with various electronics. In particular, the rapid progress in microscale electronics nanorobotics or microelectromechanical has strongly increased demand for ultrathin film devices. Therefore, thickness, highly uniform structure, chemical composition, interfacial adhesion/interactions, electrical performance of...
For next-generation wearable and implantable devices, energy storage devices should be soft mechanically deformable easily printable on any substrate or active devices. Herein, we introduce a fully stretchable lithium-ion battery system for free-form configurations in which all components, including electrodes, current collectors, separators, encapsulants, are intrinsically printable. The electrode acquires intrinsic stretchability improved interfacial adhesion with the materials via...
Anode-free sodium-metal batteries are considered one of the most promising alternatives for developing high-end due to their high theoretical capacity, low cost, and natural abundance. However, they have severe drawbacks in form inferior long-term cyclic stability. We engineered mechanically resilient MXene/CNT nano-accordion frameworks (NAFs) host significant Na without dendrite development, even at currents. The microcellular structures MXene/CNT-NAFs possess numerous micro-sized pores...
Sub-10 nm patterns prepared by directed self-assembly (DSA) of block copolymer (BCP) thin films offer a breakthrough method to overcome the limitations photolithography. Perpendicular orientation BCP nanostructures is essential for lithographic applications, but dissimilar surface/interfacial energies two blocks generally favour parallel orientations, so that perpendicular could only be obtained under very limited conditions. Here, we introduce generalized creating orientations filtered...
Abstract Reducing the thickness of Li‐metal anode is key to enhancing energy density batteries. However, poor initial lithium deposition on Cu current collectors can exacerbate growth dendrites and limit performance. This study explores innovative strategies by fabricating graphene oxide (GO) silver nanowire (AgNW) thin films onto Cu‐foil using layer‐by‐layer (LbL) assembly method. The homogeneous LbL are prepared with assistance bifunctional cross‐linkers, such as cysteamine, strengthen...
Materials combining high stiffness and mechanical energy dissipation are needed in automotive, aviation, construction, other technologies where structural elements exposed to dynamic loads. In this paper we demonstrate that a judicious combination of carbon nanotube engineered trusses held dissipative polymer can lead composite material simultaneously exhibits both damping. Indeed, the damping is reported quite any single monolithic material. Carbon (CNT) microstructures grown novel 3D truss...
Abstract Achieving high energy storage performance and fast rate capability at the same time is one of most critical challenges in battery technology. Here, a high‐performance textile cathode with notable specific/areal capacities through an interfacial interaction‐mediated assembly that can directly bridge all interfaces existing between conductive materials active materials, minimizing unnecessary insulating organics reported. First, amine (NH 2 )‐ carboxylic acid (COOH)‐functionalized...
The growth of lithium (Li) dendrites reduces the lifespan Li-metal batteries and causes safety issues. Herein, hierarchically porous aramid nanofiber separators capable effectively suppressing Li dendrite while maintaining highly stable cycle performances at high charge/discharge rates are reported. A two-step solvent exchange process combined with reprotonation-mediated self-assembly is utilized to control bimodal structure separators. In particular, when ethanol water used sequentially,...