A5006029715- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Radical Photochemical Reactions
- Flame retardant materials and properties
- Synthesis and Biological Evaluation
- Oxidative Organic Chemistry Reactions
- Supercapacitor Materials and Fabrication
- Graphene research and applications
- Photochemistry and Electron Transfer Studies
- Polymer Nanocomposites and Properties
- Porphyrin and Phthalocyanine Chemistry
- Polymer composites and self-healing
- Synthesis and Reactions of Organic Compounds
- Carbon Nanotubes in Composites
- Big Data and Business Intelligence
- Data Quality and Management
- Fire dynamics and safety research
- Innovation Policy and R&D
- Advanced Thermoelectric Materials and Devices
- Innovation and Knowledge Management
- Surface Modification and Superhydrophobicity
- Bone Tissue Engineering Materials
- Fluorine in Organic Chemistry
- Chemical Synthesis and Reactions
- Sulfur-Based Synthesis Techniques
Myongji University
2015-2024
University of Minnesota
2012-2020
University of Pennsylvania
2019
Gangneung–Wonju National University
2011-2018
Yong In University
2018
Government of the Republic of Korea
2018
University of Ulsan
2014-2016
Pohang Iron and Steel (South Korea)
2014-2016
Ulsan University Hospital
2016
Ulsan College
2016
Because of their outstanding electrical and mechanical properties, graphene strain sensors have attracted extensive attention for electronic applications in virtual reality, robotics, medical diagnostics, healthcare. Although several based on been reported, the stretchability sensitivity these remain limited, also there is a pressing need to develop practical fabrication process. This paper reports characterization new types stretchable yarns. Highly stretchable, sensitive, wearable are...
The toughening effects of graphene and graphene‐derived materials on thermosetting epoxies are investigated. Graphene with various structures surface functional groups incorporated into an epoxy resin by in situ polymerization. oxide (GO) GO modified amine‐terminated poly(butadiene‐acrylonitrile) (ATBN) chosen to improve the dispersion nanosheets increase their interfacial adhesion. An impressive effect is observed less than 0.1 wt% graphene. A maximum toughness at loadings as small 0.02 or...
Thin film assemblies of branched polyethylenimine (PEI) and poly(acrylic acid) (PAA), deposited using the layer-by-layer technique, were studied in an effort to produce all-polymer thin films with low oxygen permeability. Altering pH PEI PAA results large thickness variations (from 90 nm 4.74 μm for 30-bilayer films). Cross-linking these glutaraldehyde (GA) create inhibition polymer interdiffusion, causing exponential growth be reset. AFM images show surface morphology PEI/PAA can controlled...
Summary A prerequisite for making R&D more productive is to be able measure its productivity. Most of the previous studies on this topic have attempted productivity at firm or industry levels. In study, however, measured national level provide policy implications, particularly Asian countries. Contrary where total factor was adopted, study employs data envelopment analysis (DEA) approach DEA a multi‐factor model measuring relative efficiency each Decision Making Unit (DMU). addition basic...
With the growth of wearable electronics industry, structural modifications sensing materials have been widely attempted to improve sensitivity sensors. Herein, we demonstrate patterned graphene strain sensors, which can monitor small-scale motions by using simple, scalable, and solution-processable method. The electrical properties sensors are easily tuned via repetition layer-by-layer assembly, leading increment thickness conducting layers. In contrast nonpatterned show enhanced ability...
An acetonitrile solution of mercury(II) chloride has been found to catalyze efficiently the conversion a diverse range ketoximes into their corresponding amides/lactams.
In this paper, we propose a smart digital door lock system for home automation. A is equipment that uses the information such as secret code, semi-conductors, card, and finger prints method authentication instead of legacy key system. our proposed system, ZigBee module embedded in acts central main controller overall automation Technically, network sensor nodes actuators with base station. here consists RFID reader user authentication, touch LCD, motor opening closing door, modules detecting...
An ultra-thin, stretchable, and transparent hydrogen-bonded poly(ethylene oxide) poly(acrylic acid) ([PEO/PAA]n) bilayer (BL) positive triboelectric film was developed using a low-cost eco-friendly layer-by-layer method. [PEO/PAA]n films exhibited remarkable output performance, enabling designability, foldability, sustainability for versatile application of nanogenerators (TENGs). The dependence TENG behaviors on thickness investigated by varying the number BLs in films. It demonstrated that...
Layer-by-layer multilayers are demonstrated for low-cost, durable, scalable, and wearable graphene-TENGs on flat or undulated polymer substrates fabric textiles.
Recently, triboelectric nanogenerators (TENGs) have been widely utilized to address the energy demand of portable electronic devices by harvesting electrical from human activities or immediate surroundings. To increase surface charge and area negative TENGs, previous studies suggested several approaches such as micro-patterned arrays, porous structures, multilayer alignment, ion injections, ground systems mixing high dielectric constant materials. However, preparation processes these...
A phosphorus-doped mesoporous carbon (PMC)-filled coating was deposited on polyurethane foam (PUF) via a layer-by-layer assembly method. First, PMC prepared from bio-sourced saccharose and phytic acid using silica KIT-6 as hard template. The coated PUF then by alternate dipping into chitosan (CH) solution an alginate-stabilized (AL-PMC) aqueous dispersion. few layers (three bilayers) of the CH/AL-PMC allowed to self-extinguish when exposed butane flame (≈1400 °C). Additionally, this layer...
Abstract Harvesting sustainable energy opens new avenues for powering portable electronic devices using triboelectric nanogenerators (TENGs). Synthetic metals and polymers are used to construct most of the TENGs. Hence, ultrathin, free‐standing, translucent, chemically bonded chitosan (CH)‐ alginate (AL)‐based biopolymeric films introduced here. These fabricated a low‐cost environmentally friendly layer‐by‐layer (LbL) self‐assembly method impregnated with AgNO 3 (S) in final fabrication step...