A5063581807- Advanced Sensor and Energy Harvesting Materials
- Fiber-reinforced polymer composites
- Carbon Nanotubes in Composites
- Conducting polymers and applications
- Graphene research and applications
- Gas Sensing Nanomaterials and Sensors
- Tribology and Wear Analysis
- Polymer Nanocomposites and Properties
- Synthesis and properties of polymers
- Tactile and Sensory Interactions
- Smart Materials for Construction
- Augmented Reality Applications
- Fullerene Chemistry and Applications
- Polymer crystallization and properties
- Advancements in Battery Materials
- Advanced Cellulose Research Studies
- Carbon dioxide utilization in catalysis
- Composite Material Mechanics
- Polymer Nanocomposite Synthesis and Irradiation
- 3D Surveying and Cultural Heritage
- Supercapacitor Materials and Fabrication
- biodegradable polymer synthesis and properties
- Graphene and Nanomaterials Applications
- Electrospun Nanofibers in Biomedical Applications
- Engineering Applied Research
Hanwha Solutions (South Korea)
2021
Ulsan National Institute of Science and Technology
2013-2020
Government of the Republic of Korea
2018
Poly(dopamine)-treated graphene oxide/poly(vinyl alcohol) (“dG-O/PVA”) composite films were made and characterized. G-O was modified with poly(dopamine) in aqueous solution then chemically reduced to yield poly(dopamine)-treated G-O. A combination of hydrogen bonding, strong adhesion at the interface PVA sheets, reinforcement by resulted increases tensile modulus, ultimate strength, strain-to-failure 39, 100, 89%, respectively, 0.5 wt % dG-O loading PVA. The serves as a moisture barrier for...
Textile-based sensors can perceive and respond to environmental stimuli in daily life, hence are critical components of wearable devices.
Poly(vinylidene fluoride) (PVDF)/graphene oxide (GO) nanocomposite fibers were dry-jet wet spun at the GO concentrations of 0, 1, and 2 wt % with respect to polymer. The as-spun drawn in draw ratio (DR) range 2–6.5, correlation between PVDF chain conformation mechanical properties upon drawing has been studied by two-dimensional spectroscopy Fourier-transformed infrared, wide-angle X-ray diffraction, differential scanning calorimetry, tensile testing. PVDF/GO exhibited that mobile crystals...
Free-standing carbon nanomaterial hybrid sheets, consisting of multi-walled nanotubes (MWCNTs), exfoliated graphite nanoplatelets (xGnPs) and nanographene platelets (NGPs) different lengths lateral dimensions, have been prepared using various material combinations compositions. When subjected to tensile strains, the sheets showed piezoresistive behavior, characterized by a change in electrical resistance with applied strain. Simultaneous measurement changes among multiple electrodes placed...
A class of conducting reduced graphene oxide hydrogels is prepared with various porosities, surface areas, and electrical conductivities using ethylenediamine (EDA)/functionalized (GO) ascorbic acid (VC)/GO by hydrothermal method. The microstructure tailored changing the composition materials. It observed that conducing network formed cross-linked platelets, piezoresistive behavior under cyclic compressive strain shows a linear trend up to 6.8% when hydrogel adding 5 wt % EDA in aqueous GO...
We demonstrate a graphene-coated polymer film as transparent piezoresistive strain sensor. Strain sensitivity was tuned by controlling the thickness and density of graphene layer well adhesion force between substrate. Chemically reducing oxide, thereby maximizing its to substrate, while minimizing coating resulted in excellent transparency high gauge factors. The fabrication method presented allows design optimization transparent, high-performance, sensitivity-tunable sensors, which can make...
Highly sensitive and flexible composite sensors with pressure temperature sensing abilities are of great importance in human motion monitoring, robotic skins, automobile seats when checking the boarding status. Several studies have been conducted to improve temperature-pressure sensitivity; however, they require a complex fabrication process for micro-nanostructures, which material-dependent. Therefore, there is need develop structural designs abilities. Herein, we demonstrate an enhanced...
Multiscale hybrid composites, which consist of polymeric resins, microscale fibers and nanoscale reinforcements, have drawn significant attention in the field advanced, high-performance materials. Despite their advantages, multiscale composites show challenges associated with nanomaterial dispersion, viscosity, interfacial bonding load transfer, orientation control. In this paper, carbon nanotube(CNT)/carbon fiber(CF)/polycarbonate(PC) composite were fabricated by a solution process to...
수정된 Hummer's 방법으로 제조된 산화그래핀(graphene oxide, GO)을 이용하여 PMMA와 Nylon 6,6에 분산시켜 각각 복합재료 섬유와 필름으로 제조하고 동적기계적 물성과 인장특성을 분석하였다. 분석과 인장 특성에서 GO-PMMA 섬유는 GO의 효율적 기계적 물성 보강 효과를 확인 하였으나 6,6 복합재료는 제조과정에서 사용된 포름산의 낮은 pH로 인해 산화그래핀의 분산안정성이 저하되어, 보강효율을 보임을 알 수 있었다. In this work, we successfully fabricated graphene oxide (GO) and GO-based PMMA composite fiber nylon films. Dynamic mechanical tensile properties of PMMA-GO showed that GO is efficient reinforcement for polymer matrices. However, 6,6-GO films low...
탄소나노소재의 화학적 기능화는 대부분 복합체 제조 시 고분자 모재(matrix)와의 계면 특성 향상을 위한 방법으로 적용되어 왔다. 계면결합력의 증가에 따른 효과는 기계적 물성의 증가를 통해 간접적으로 확인할 수 있으며, 이는 계면에서 효과적인 응력전달을 설명된다. 보다 직접적으로 기능화를 통한 계면결합력 증가의 효과를 설명하기 위하여 피에조 저항효과를 관찰할 이를 통하여 변형에 대한 내부의 전도성 충진재의 거동을 짐작해 볼 있다. 위해 다중벽 탄소나노튜브(MWCNT)와 환원 그래핀(rGO)을 황산/질산 용액을 이용하여 산화반응을 기능기를 도입하였으며, 기능화 전 후의 복합체의 전기적 저항 및 측정하였다. 결과로부터 기능기 도입으로 인해 증가한 구조적 결함이 저항의 야기하지만 동일한 대하여 변화가 더 크게 나타나 내부 입자의 유동성이 증가함을 확인하였고, 계면결합력이 저항효과 관찰을 있었다. Chemical functionalization of carbon...