A5003261493- Graphene research and applications
- Carbon Nanotubes in Composites
- Fiber-reinforced polymer composites
- Advanced Sensor and Energy Harvesting Materials
- Supercapacitor Materials and Fabrication
- Rheology and Fluid Dynamics Studies
- Conducting polymers and applications
- Blood properties and coagulation
- Synthesis and properties of polymers
- Nanopore and Nanochannel Transport Studies
- Liquid Crystal Research Advancements
- Microfluidic and Bio-sensing Technologies
- Advanced Materials and Mechanics
- Surface Modification and Superhydrophobicity
- Polymer crystallization and properties
- 3D Printing in Biomedical Research
- Graphene and Nanomaterials Applications
- Advancements in Battery Materials
- Micro and Nano Robotics
- Semiconductor Lasers and Optical Devices
- Granular flow and fluidized beds
- Electrostatics and Colloid Interactions
- Analytical Chemistry and Sensors
- Fluid Dynamics and Heat Transfer
- Silk-based biomaterials and applications
Korea Institute of Science and Technology
2020-2025
Korea Institute of Materials Science
2024
Dong-A University
2015-2020
Government of the Republic of Korea
2019
Theoretical considerations suggest that the strength of carbon nanotube (CNT) fibers be exceptional; however, their mechanical performance values are much lower than theoretical values. To achieve macroscopic with ultrahigh performance, we developed a method to form multidimensional nanostructures by coalescence individual nanotubes. The highly aligned wet-spun single- or double-walled bundles were graphitized induce collapse and multi-inner walled structures. These advanced formed network...
Many strategies for manufacturing high-performance carbon nanotube (CNT) fibers have been reported in the past decade. Although spinning is an essential process regardless of CNT pre-treatment method or fiber post-treatment route, little research has carried out into itself. During formation such through spinning, intra- and inter-bundle voids inevitably arise. The size amount these determines macroscopic properties fibers. Therefore, controlling internal key enhancing their properties. We...
A series of polyimide (PI) nanocomposite films with different loadings aminophenyl functionalized graphene nanosheets (AP-rGO) was fabricated by in situ polymerization. AP-rGO, a multifunctional carbon nanofiller that can induce covalent bonding between and the PI matrix, obtained through combination chemical reduction surface modification. In addition, phenyl (P-rGO) were prepared phenylhydrazine for reference films. Because homogeneous dispersion AP-rGO strong interfacial interaction...
Development of carbon fibers (CFs) with high strength and modulus for structural applications in CF-reinforced polymer (CFRP) industry has been a challenge. Herein, we propose method manufacturing highly oriented polymer–carbon nanotube (CNT) composite having (4.8 ± 0.2 GPa), (390 48 electrical conductivity (5.75 0.84 MS m-1) by liquid crystalline wet-spinning process. The use chlorosulfonic acid (CSA) as solvent CNTs polyimide (PI) promotes dispersion enables the production high-performance...
Abstract Individual carbon nanotubes (CNT) and graphene have unique mechanical electrical properties; however, the properties of their macroscopic assemblies not met expectations because limited physical dimensions, degree dispersion components, various structural defects. Here, a state‐of‐the‐art assembly for novel type hybrid fiber possessing required wide variety multifunctional applications is presented. A simple effective multidimensional nanostructure CNT oxide (GO) assembled by...
Individual carbon nanotubes (CNTs) have gained popularity as lightweight wire materials due to their high electrical conductivity and low density than that of copper wires. Despite intensive research on light-weight highly conductive CNT fibers, the bulk properties assemblies are inferior those metal wires in terms conductivity. Herein, we propose a method increase specific fibers with polyaniline (PANI). The structure physical precisely controlled by optimizing PANI content through simple...
In this study, we investigate structural change in wet-spun carbon nanotube (CNT) fibers and explore the resulting changes density tensile strength. Given presence of chlorosulfonic acid (CSA) inside fiber evolution tubular shape, difference between experimental CNT theoretical individual CNTs can be reasonably approximated. During heat treatment pristine at 1400 °C, capillary force induced by removal CSA among leads to polygonization circumference nanotubes. This morphological...
Abstract Carbon nanotubes (CNTs) represent an advanced material with exceptional mechanical, electrical, and thermal properties. However, realizing these properties in fiber applications requires effective removal of impurities particularly amorphous carbon. This study presents optimized oxidation strategy to remove carbon while preserving the nanotube structure. We investigated various conditions, focusing on temperature-time conditions their effects SWCNT structure formation. Here, we...
In our earlier theoretical work [Lee and Muller, J. Rheol. 61, 1049–1059 (2017)], we proposed a design for differential pressure extensional rheometer (DPER) on chip. Here, implement the DPER to evaluate steady-state viscosity of semidilute poly(ethylene oxide) solution at high low extension rates. At rates, exhibits strain thinning behavior with power-law exponent −0.5. intermediate thickening. plateau has been estimated, corresponding finite extendable nonlinear elastic (FENE) constant is...
Thin-film-transistor-liquid crystal displays (TFT-LCDs) still dominate most of the display markets due to a big leap in image quality while keeping low cost and superior reliability, its evolution is continuing compete with emerging emissive displays. In this paper, recent progress liquid technologies mainly focusing on fringe-field switching (FFS) polymer-stabilized vertical alignment (PS-VA) modes materials for improving electro-optic performances reviewed.
This paper presents the fabrication and characterization of high-performance carbon nanotube-polyphenylene sulfide (CNT-PPS) composite fibers. The study begins by dissolving PPS in chlorosulfonic acid (CSA) to create dopes suitable for wet-spinning, enabling formation CNT-PPS presence PPS, known its low solubility high crystallinity, leads improved mechanical properties thermal stability after carbonization. structural evolution fibers during heat treatment is examined. results show that...
Deformation of biological cells, tissues, and similar soft materials is often considered linearly elastic; however, the assumption only valid in a very limited stress range leads to significant errors mechanical evaluation. We demonstrated hyper-elastic behavior ultra-soft poly(N-isopropyl acrylamide) (PNIPAm) microgels (USPNMs) converging channel flow, as representation for tissues. The hyper-elasticity USPNMs response broad deformation was characterized at centerline flow. introduced...
By measurement of the electrical conductivities GO coated PET films during reduction reaction, we determined activation energy.
Abstract Monofilament type of polyaromatic amide (PA) and carbon nanotube (CNT) composite fibers is presented. A concept a lyotropic liquid crystal (LLC) constructed via spontaneous self-assembly introduced to mitigate the extremely low compatibility between PA CNT. These approaches provide an effective co-processing route CNT simultaneously fabricate uniform, continuous, reliable through wet-spinning. Interestingly, addition small amount into dope solution governs LLC mesophase not only in...
Polyimide/graphene oxide nanoribbon (PI/GONR) composite fibers were prepared by wet spinning. The unfolded GONRs the intense drawing of maximized their contribution to enhance mechanical and conductivity properties. spun with an optimal ratio 18, followed carbonization at 1200 1400 °C, respectively. PI/GONR (0.1 wt%) carbonized °C have highest tensile strength (2.12 ± 0.45 GPa), which was 35% increase compared PI-based carbon that are °C. In addition, electrical (604 33 S/cm) thermal (12...