Search results for: Kap Seung Yang

Items from 1 to 20 out of 53 results

article

Highly Bendable and Rotational Textile Structure with Prestrained Conductive Sewing Pattern for Human Joint Monitoring

Sangki Park, Seongcheol Ahn, Jingzhe Sun, Divij Bhatia, more

Advanced Functional Materials > 29 > 10 > n/a - n/a

Human joints have respective ranges of motion and joint forces corresponding to each kind of joint; this necessitates considerations of the characteristics of human joints to fabricate wearable strain sensors conformable to the human body, and capable of precisely monitoring complex motions of the human body. In the present study, the “all textile‐based highly stretchable structure” that is capable...

article

Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile-based carbon fibers

Doo-Won Kim, Dae Ho Kim, Sung Ryong Kim, Bo-Hye Kim, more

Carbon Letters > 2019 > 29 > 5 > 479-485

This study demonstrates that low processing rate for producing polyacrylonitrile (PAN)-based carbon fiber is a critical to obtain a homogeneous radial microstructure with high resistance to oxidation, thereby resulting in their improved mechanical strength. The dry-jet wet spun PAN organic fibers were processed (e.g., stabilized and then carbonized) utilizing two different rates; one is 1.6 times...

article

Synthesis, characterization and antitubercular activities of novel pyrrolyl hydrazones and their Cu-complexes

Shrinivas D. Joshi, Devendra Kumar, Sheshagiri R. Dixit, Nageshwar Tigadi, more

European Journal of Medicinal Chemistry > 2016 > 121 > C > 21-39

Novel pyrrolyl hydrazones and their copper complexes have been synthesized and characterized using analytical and spectral techniques to show the tetrahedral geometry for Cu(II) complexes. Biological activities of hydrazones have been assessed to understand the role of metal ion on their biological activity and the effect of pyrrolyl hydrazones. In vitro antitubercular activity against Mycobacterium...

article

Facile synthesis of self-standing binder-free vanadium pentoxide-carbon nanofiber composites for high-performance supercapacitors

Arup Choudhury, Ji-Hoon Kim, Kap-Seung Yang, Duck-Joo Yang

Electrochimica Acta > 2016 > 213 > C > 400-407

Vanadium pentoxide (V₂O₅) thin layers were hydrothermally deposited on self-standing carbon nanofibre (CNF) paper, which was fabricated through electrospinning of polyacrylonitrile (PAN) precursor solution followed by thermal stabilization and carbonization. The prepared V₂O₅/CNF nanocomposite paper was characterized by various spectroscopic and microscopic techniques. The electrochemical performance...

article

Densifying and strengthening of electrospun polyacrylonitrile‐based nanofibers by uniaxial two‐step stretching

Je Sung Youm, Ji Hoon Kim, Chang Hyo Kim, Jeong Cheol Kim, more

Journal of Applied Polymer Science > 133 > 37 > n/a - n/a

The effects of alignment of polyacrylonitrile (PAN) nanofibers and a two‐step drawing process on the mechanical properties of the fibers were evaluated in the current study. The alignment was achieved using a high‐speed collector in electrospinning synthesis of the nanofibers. Under optimal two‐step drawing conditions (e.g., hot‐water and hot‐air stretching), the PAN nanofiber felts exhibited large...

article

Design and development of pyrrole carbaldehyde: an effective pharmacophore for enoyl-ACP reductase

Shrinivas D. Joshi, Devendra Kumar, Uttam A. More, Kap Seung Yang, more

Medicinal Chemistry Research > 2016 > 25 > 4 > 672-689

Enoyl-ACP reductase is the key enzyme involved in FAS-II synthesis of mycolic acid in bacterial cell wall and is a promising target for discovering new chemical entity. The designed pharmacophores are the possible better tools to combat mutation in enoyl-ACP enzyme, which leads to a decrease in volume of triclosan binding site. Compound 3a showed H-bonding interactions similar to that of triclosan...

article

Synthesis, antimycobacterial screening and ligand-based molecular docking studies on novel pyrrole derivatives bearing pyrazoline, isoxazole and phenyl thiourea moieties

Shrinivas D. Joshi, Sheshagiri R. Dixit, M.N. Kirankumar, Tejraj M. Aminabhavi, more

European Journal of Medicinal Chemistry > 2016 > 107 > Complete > 133-152

We report here the synthesis, antibacterial and antitubercular evaluation of 61 novel pyrrolyl derivatives bearing pyrazoline, isoxazole and phenyl thiourea moieties. Molecular docking was carried out on enoyl ACP reductase from Mycobacterium tuberculsosis using Surflex-Dock, which is one of the key enzymes involved in type II fatty acid biosynthetic pathway of Mycobacterium tuberculosis, an attractive...

article

Highly conductive, porous RuO2/activated carbon nanofiber composites containing graphene for electrochemical capacitor electrodes

Kap Seung Yang, Bo-Hye Kim

Electrochimica Acta > 2015 > 186 > C > 337-344

RuO₂/activated carbon nanofiber (ACNF) composites containing graphene are prepared by a simple electrospinning method, followed by physical activated carbonation. We investigate the electrochemical properties as supercapacitor electrodes and the structural properties of these RuO₂/ACNF materials as a function of the graphene concentration. The porous RuO₂/ACNF composites exhibit an improved microstructure...

article

Preparation and electrochemical properties of RuO2-containing activated carbon nanofiber composites with hollow cores

Kap Seung Yang, Chang Hyo Kim, Bo-Hye Kim

Electrochimica Acta > 2015 > 174 > C > 290-296

RuO₂-containing activated carbon nanofibers with hollow cores (PMRu-ACNFs) are prepared through one-step electrospinning using polyacrylonitrile (PAN), poly(methyl methacrylate) (PMMA), and ruthenium(III) acetylacetonate followed by thermal treatment. The porous PMRu-ACNF composites exhibit an improved morphological structure and textual properties due to the increased surface area, unique nanotexture,...

article

In-situ synthesis of vanadium pentoxide nanofibre/exfoliated graphene nanohybrid and its supercapacitor applications

Arup Choudhury, Jeliza S. Bonso, Melissa Wunch, Kap Seung Yang, more

Journal of Power Sources > 2015 > 287 > C > 283-290

A novel nanohybrid material composed of vanadium pentoxide nanofibres (VNFs) and exfoliated graphene were prepared by in-situ growth of VNFs onto graphene nanosheets, and explicated as electrode material for supercapacitor applications. The existence of non-covalent interactions between VNFs and graphene surfaces was confirmed by Raman and Fourier transform infrared (FTIR) spectroscopes. Morphological...

article

Shell–core structured carbon fibers via melt spinning of petroleum- and wood-processing waste blends

Moo Sung Kim, Dong Hun Lee, Chang Hyo Kim, Yang Jin Lee, more

Carbon > 2015 > 85 > C > 194-200

In the last decades, carbon fibers with light weight and high strength have experienced the largely increased uses in various industrial applications. However, their expected uses in the automotive industry and building are largely limited because of their high production cost. Herein, we have demonstrated an effective method of making low cost carbon fibers via the melt spinning of petroleum-processing...

chapter

IT02. TiO2 nanoparticles loaded on graphene/carbon composite nanofibers by electrospinning for increased photocatalysis

Chang Hyo Kim, Bo-Hye Kim, Kap Seung Yang

2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS) > II - III

2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS)

Graphene/carbon composite nanofibers (GCNFs) with attached TiO2 nanoparticles (TiO2-GCNF) were prepared, and their photocatalytic degradation ability under visible light irradiation was assessed. They were characterized using scanning and transmission electron microscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and ultraviolet-visible diffuse spectroscopy. The results...

article

Improving the microstructure and electrochemical performance of carbon nanofibers containing graphene-wrapped silicon nanoparticles as a Li-ion battery anode

So Yeun Kim, Kap Seung Yang, Bo-Hye Kim

Journal of Power Sources > 2015 > 273 > C > 404-412

A novel anode material for lithium-ion batteries, graphene-wrapped Si nanoparticles (NPs) embedded in carbon composite nanofibers (CCNFs) with G/Si, is fabricated by electrospinning and subsequent thermal treatment. In CCNFs with G/Si, Si NPs are distributed and preserved inside the CNF surface because the graphene wrapping the Si NPs help prevent agglomeration and ensure a good dispersion of Si NPs...

article

Structure and electrochemical properties of electrospun carbon fiber composites containing graphene

Bo-Hye Kim, Kap Seung Yang

Journal of Industrial and Engineering Chemistry > 2014 > 20 > 5 > 3474-3479

Electrically conducting carbon nanofiber (CNF) composite mats are prepared by electrospinning blended solutions of graphene oxide and polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF), and their electrochemical properties are investigated as electrodes of supercapacitors. A graphene oxide concentration of 5wt.% in a PAN polymer solution offers a large specific surface area and good conductivity...

article

A selective way to create defects by the thermal treatment of fluorinated double walled carbon nanotubes

Hiroyuki Muramatsu, Kazunori Fujisawa, Yong-Il Ko, Kap-Seung Yang, more

Chinese Journal of Catalysis > 2014 > 35 > 6 > 864-868

Nanoscale defects in the outer tube to preserve the electrical and optical features of the inner tube can be engineered to exploit the intrinsic properties of double walled carbon nanotubes (DWCNTs) for various promising applications. We demonstrated a selective way to make defects in the outer tube by the fluorination of DWCNTs followed by the thermal detachment of the F atoms at 1000 °C in argon...

article

Enhanced electrical capacitance of tetraethyl orthosilicate-derived porous carbon nanofibers produced via electrospinning

Bo-Hye Kim, Kap Seung Yang

Journal of Electroanalytical Chemistry > 2014 > 714-715 > Complete > 92-96

Porous carbon nanofibers with SiOC/SiOSi group (Si/ACNF) mats are produced by incorporating tetraethyl orthosilicate (TEOS) into polyacrylonitrile (PAN) via electrospinning/activation, and their electrochemical properties as a supercapacitor electrode are investigated. The Si/ACNF exhibits a high surface area of up to 1386.91m ² g ⁻¹ as result of the ultramicropore size distributions...

article

Electrochemical behavior of activated carbon nanofiber-vanadium pentoxide composites for double-layer capacitors

Bo-Hye Kim, Kap Seung Yang, Duck J. Yang

Electrochimica Acta > 2013 > 109 > Complete > 859-865

Mesopore-enriched activated carbon nanofiber (ACNF) mats are produced by incorporating vanadium(V) oxide (V ₂ O ₅ ) into polyacrylonitrile (PAN) via electrospinning, and their electrochemical properties are investigated as an electrode in supercapacitors. The microstructures of the ACNFs (e.g., nanometer-size diameter, high specific surface area, narrow pore size distribution, and...

article

Preparation and electrochemical characteristics of a polyvinylpyrrolidone-stabilized Si/carbon composite nanofiber anode for a lithium ion battery

So Yeun Kim, Bo-Hye Kim, Kap Seung Yang

Journal of Electroanalytical Chemistry > 2013 > 705 > Complete > 52-56

Si/carbon composite nanofibers are prepared by electrospinning a blend solution of polyacrylonitrile (PAN), polyvinylpyrrolidone (PVP), and Si particles in N,N-dimethylformamide (DMF) and then carbonizing at 800°C. These composite nanofibers deliver more than 1000mAg ⁻¹ of reversible capacity for 30 cycles at 200mAg ⁻¹ current density and also maintain clear fibrous morphology, sustaining...

article

Carbon in Korea

Kap Seung Yang

Carbon > 2013 > 60 > Complete > 568

The history of carbon science in Korea is summarized in this review. There is a record of charcoal being used to maintain collections of woodblock prints at a stable relative humidity such as the Tripitaka Koreana that were engraved from 1237 to 1248 and are designated a World Heritage Site by UNESCO. Carbon research in Korea has been led by researchers educated in foreign countries such as Germany,...

article

Boron-nitrogen functional groups on porous nanocarbon fibers for electrochemical supercapacitors

Bo-Hye Kim, Kap Seung Yang, Hee-Gweon Woo

Materials Letters > 2013 > 93 > Complete > 190-193

Boron- and nitrogen-containing porous carbon nanofibers (BN-CNFs) were prepared through one-step electrospinning using boric acid (H ₃ BO ₃ ) and urea as boron and nitrogen precursors and a subsequent thermal treatment. The BN-CNFs showed higher capacitance and energy/power density values than the control sample of CNFs in aqueous electrolyte; the large surface area of 559m ² ...

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ELECTROSPINNING (20)
SUPERCAPACITOR (8)
CARBON NANOFIBER (7)
GRAPHENE (6)
CARBON NANOFIBER COMPOSITE (4)
CARBON FIBER (3)
CARBONIZATION (3)
ELECTRICAL CONDUCTIVITY (3)
ELECTROCHEMICAL CAPACITOR (3)
ELECTROCHEMICAL PERFORMANCE (3)
MECHANICAL PROPERTIES (3)
SILICA (3)
X-RAY DIFFRACTION (3)
ANTI-TUBERCULAR ACTIVITY (2)
CARBON FIBERS (2)
CYTOTOXICITY ACTIVITY (2)
ELECTROCHEMICAL BEHAVIOR (2)
ELECTROSPUN CARBON NANOFIBER (2)
ENZYME INHIBITION STUDIES (2)
HETEROATOMS (2)
HOLLOW CORE (2)
MORPHOLOGY (2)
ORGANIC ELECTROLYTE (2)
OXIDATION RESISTANCE (2)
PITCH (2)
POLYACRYLONITRILE (2)
POROSITY (2)
SULFONATION (2)
SURFLEX DOCKING (2)
TETRAETHYL ORTHOSILICATE (2)
VANADIUM PENTOXIDE (2)
3D-QSAR (1)
A. ISOTROPIC CARBON (1)
A. PITCH, CARBON FIBERS, ACTIVATED CARBON (1)
ACTIVATED CARBON FIBER (1)
ACTIVATED CARBON FIBERS (1)
ACTIVATED CARBON NANOFIBER (1)
ACTIVATED CARBON NANOFIBER COMPOSITE (1)
ACTIVATION (1)
AG NANOPARTICLES (1)
ALL‐TEXTILE (1)
AMORPHOUS RUO2 (1)
ANODE MATERIAL (1)
ANTIBACTERIAL ACTIVITY (1)
ANTITUBERCULAR ACTIVITY (1)
ASYMMETRIC SUPERCAPACITOR (1)
B. CARBONIZATION (1)
BET SURFACE AREA (1)
BORIC ACID (1)
BORON TRIOXIDE (1)
BORONTRIFLUORIDE DIETHYLETHERATE COMPLEX (1)
C. SCANNING ELECTRON MICROSCOPY (SEM) (1)
C. X-RAY DIFFRACTION (1)
CARBON (1)
CARBON FIBRES (1)
CARBON NANOFIBERS (1)
CARBON NANOFIBRES (1)
CHEMICAL OXIDATIVE POLYMERIZATION (1)
COAL TAR (1)
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COMPOSITES (1)
CONTROLLABLE STARTING POINT OF SENSING (1)
CROSSLINKING (1)
CRYSTALLINITY (1)
D. CARBON YIELD (1)
D. ELECTRICAL PROPERTIES (1)
DE-FLUORINATION (1)
DEFECT ENGINEERING (1)
DEGRADATION (1)
DOUBLE WALLED CARBON NANOTUBE (1)
ELECTRICAL PROPERTIES (1)
ELECTROCHEMICAL CAPACITOR ELECTRODES (1)
ELECTROCHEMICAL CAPACITORS (1)
ELECTROCHEMICAL MEASUREMENT (1)
ELECTROCHEMICAL PROPERTIES (1)
ELECTROCHEMICAL SUPERCAPACITOR (1)
ELECTRON BEAM CURING (1)
ELECTRON BEAM IRRADIATION (1)
ENOYL-ACP REDUCTASE (1)
EXFOLIATED GRAPHENE (1)
FIELD-EMISSION SCANNING ELECTRON MICROSCOPY (1)
FLUORINATION (1)
FUNCTIONAL GROUP (1)
GRAPHENE-WRAPPED SI NANOPARTICLE (1)
HIERARCHICAL POROUS CARBON NANOFIBER (1)
HIGHLY CONFORMABLE STRAIN SENSOR (1)
IONIC CONDUCTIVITY (1)
ISOTROPIC CARBON (1)
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LIGNIN (1)
LITHIUM ION BATTERY (1)
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Electrochimica Acta (10)
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Carbon (6)
Fibers and Polymers (4)
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Journal of Power Sources (3)
Applied Surface Science (2)
European Journal of Medicinal Chemistry (2)
Journal of Electroanalytical Chemistry (2)
ACS Applied Materials & Interfaces (1)
Advanced Functional Materials (1)
Carbon Letters (1)
Chinese Journal of Catalysis (1)
Electrochemistry Communications (1)
Journal of Applied Electrochemistry (1)
Journal of Applied Polymer Science (1)
Journal of Industrial and Engineering Chemistry (1)
Journal of Materials Science (1)
Medicinal Chemistry Research (1)
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INFONA - science communication portal

Search results for: Kap Seung Yang

Highly Bendable and Rotational Textile Structure with Prestrained Conductive Sewing Pattern for Human Joint Monitoring

Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile-based carbon fibers

Synthesis, characterization and antitubercular activities of novel pyrrolyl hydrazones and their Cu-complexes

Facile synthesis of self-standing binder-free vanadium pentoxide-carbon nanofiber composites for high-performance supercapacitors

Densifying and strengthening of electrospun polyacrylonitrile‐based nanofibers by uniaxial two‐step stretching

Design and development of pyrrole carbaldehyde: an effective pharmacophore for enoyl-ACP reductase

Synthesis, antimycobacterial screening and ligand-based molecular docking studies on novel pyrrole derivatives bearing pyrazoline, isoxazole and phenyl thiourea moieties

Highly conductive, porous RuO2/activated carbon nanofiber composites containing graphene for electrochemical capacitor electrodes

Preparation and electrochemical properties of RuO2-containing activated carbon nanofiber composites with hollow cores

In-situ synthesis of vanadium pentoxide nanofibre/exfoliated graphene nanohybrid and its supercapacitor applications

Shell–core structured carbon fibers via melt spinning of petroleum- and wood-processing waste blends

IT02. TiO2 nanoparticles loaded on graphene/carbon composite nanofibers by electrospinning for increased photocatalysis

Improving the microstructure and electrochemical performance of carbon nanofibers containing graphene-wrapped silicon nanoparticles as a Li-ion battery anode

Structure and electrochemical properties of electrospun carbon fiber composites containing graphene

A selective way to create defects by the thermal treatment of fluorinated double walled carbon nanotubes

Enhanced electrical capacitance of tetraethyl orthosilicate-derived porous carbon nanofibers produced via electrospinning

Electrochemical behavior of activated carbon nanofiber-vanadium pentoxide composites for double-layer capacitors

Preparation and electrochemical characteristics of a polyvinylpyrrolidone-stabilized Si/carbon composite nanofiber anode for a lithium ion battery

Carbon in Korea

Boron-nitrogen functional groups on porous nanocarbon fibers for electrochemical supercapacitors

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