This page has only limited features, please log in for full access.

Prof. Dr. Byung-Joo Kim
Korea Institute of Carbon Convergence Technology (KCTECH), Jeonju, Korea

Basic Info


Research Keywords & Expertise

0 Cfrp
0 functional composites
0 Filler–matrix interaction
0 Surface modification of fillers
0 Polymer blending

Fingerprints

Surface modification of fillers
Cfrp

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 21 August 2021 in Catalysts
Reads 0
Downloads 0

Amorphous TiO2 doped with N was characterized by its photocatalytic activity under visible light irradiation. The amorphous N-doped TiO2 was prepared by the sol-gel method through heat treatment at a low temperature. The photocatalyst showing activity in visible light despite heat treatment at low temperature can be applied to plastics and has excellent utility. The N-doped TiO2 appeared amorphous when heat-treated at 130 °C. It was converted into an anatase-type N-doped TiO2 when this was calcined at 500 °C. The photocatalyst showed photocatalytic activities in the photocatalytic decomposition of formaldehyde and methylene blue under visible light irradiation. The photocatalyst exhibited a higher rate of hydrogen production than that of TiO2 in photocatalytic decomposition of water under liquid-phase plasma irradiation. The bandgap of the amorphous N-doped TiO2 measured by investigation of optical properties was 2.4 eV. The lower bandgap induced the photocatalytic activities under visible light irradiation.

ACS Style

Kyong-Hwan Chung; Byung-Joo Kim; Young-Kwon Park; Sang-Chai Kim; Sang-Chul Jung. Photocatalytic Properties of Amorphous N-Doped TiO2 Photocatalyst under Visible Light Irradiation. Catalysts 2021, 11, 1010 .

AMA Style

Kyong-Hwan Chung, Byung-Joo Kim, Young-Kwon Park, Sang-Chai Kim, Sang-Chul Jung. Photocatalytic Properties of Amorphous N-Doped TiO2 Photocatalyst under Visible Light Irradiation. Catalysts. 2021; 11 (8):1010.

Chicago/Turabian Style

Kyong-Hwan Chung; Byung-Joo Kim; Young-Kwon Park; Sang-Chai Kim; Sang-Chul Jung. 2021. "Photocatalytic Properties of Amorphous N-Doped TiO2 Photocatalyst under Visible Light Irradiation." Catalysts 11, no. 8: 1010.

Journal article
Published: 22 July 2021 in Polymers
Reads 0
Downloads 0

In this work we describe a soft and ultrastretchable fiber with a magnetic liquid metal (MLM) core for electrical switches used in remote magnetic actuation. MLM was prepared by removing the oxide layer on the liquid metal and subsequent mixing with magnetic iron particles. We used SEBS (poly[styrene-b-(ethylene-co-butylene)-b-styrene]) and silicone to prepare stretchable elastic fibers. Once hollow elastic fibers form, MLM was injected into the core of the fiber at ambient pressure. The fibers are soft (Young’s modulus of 1.6~4.4 MPa) and ultrastretchable (elongation at break of 600~5000%) while maintaining electrical conductivity and magnetic property due to the fluidic nature of the core. Magnetic strength of the fibers was characterized by measuring the maximum effective distance between the magnet and the fiber as a function of iron particle concentration in the MLM core and the polymeric shell. The MLM core facilitates the use of the fiber in electrical switches for remote magnetic actuation. This ultrastretchable and elastic fiber with MLM core can be used in soft robotics, and wearable and conformal electronics.

ACS Style

Kyeongmin Hong; Minjae Choe; SeoYeon Kim; Hye-Min Lee; Byung-Joo Kim; Sungjune Park. An Ultrastretchable Electrical Switch Fiber with a Magnetic Liquid Metal Core for Remote Magnetic Actuation. Polymers 2021, 13, 2407 .

AMA Style

Kyeongmin Hong, Minjae Choe, SeoYeon Kim, Hye-Min Lee, Byung-Joo Kim, Sungjune Park. An Ultrastretchable Electrical Switch Fiber with a Magnetic Liquid Metal Core for Remote Magnetic Actuation. Polymers. 2021; 13 (15):2407.

Chicago/Turabian Style

Kyeongmin Hong; Minjae Choe; SeoYeon Kim; Hye-Min Lee; Byung-Joo Kim; Sungjune Park. 2021. "An Ultrastretchable Electrical Switch Fiber with a Magnetic Liquid Metal Core for Remote Magnetic Actuation." Polymers 13, no. 15: 2407.

Journal article
Published: 30 June 2021 in Polymers
Reads 0
Downloads 0

In this study, a method for manufacturing high-density polyethylene (HDPE)-based carbon fibers using a hybrid cross-linking method was studied. HDPE precursor fibers were first cross-linked with an electron beam (E-beam) at an irradiation dose of 1000–2500 kGy, and then cross-linked in sulfuric acid at 80–110 °C for 60 min. Hybrid crosslinked fibers were carbonized for 5 min at a temperature of 900 °C. As a result, the hybrid crosslinked fibers had a carbonization yield of 40%. In addition, the carbonized fibers after hybrid crosslinking exhibited perfect fiber morphology, and HDPE-based carbon fibers with (002) and (10l) peaks, which are the intrinsic XRD peaks of carbon fibers, were successfully prepared.

ACS Style

Seong-Hyun Kang; Kwan-Woo Kim; Byung-Joo Kim. Carbon Fibers from High-Density Polyethylene Using a Hybrid Cross-Linking Technique. Polymers 2021, 13, 2157 .

AMA Style

Seong-Hyun Kang, Kwan-Woo Kim, Byung-Joo Kim. Carbon Fibers from High-Density Polyethylene Using a Hybrid Cross-Linking Technique. Polymers. 2021; 13 (13):2157.

Chicago/Turabian Style

Seong-Hyun Kang; Kwan-Woo Kim; Byung-Joo Kim. 2021. "Carbon Fibers from High-Density Polyethylene Using a Hybrid Cross-Linking Technique." Polymers 13, no. 13: 2157.

Journal article
Published: 09 March 2021 in Nanomaterials
Reads 0
Downloads 0

Kenaf-derived activated carbons (AKC) were prepared by H3PO4 activation for automobile canisters. The microstructural properties of AKC were observed using Raman spectra and X-ray diffraction. The textural properties were studied using N2/77 K adsorption isotherms. Butane working capacity was determined according to the ASTM D5228. From the results, the specific surface area and total pore volume of the AKC was determined to be 1260–1810 m2/g and 0.68–2.77 cm3/g, respectively. As the activation time increased, the butane activity and retentivity of the AKC increased, and were observed to be from 32.34 to 58.81% and from 3.55 to 10.12%, respectively. The mesopore ratio of activated carbon increased with increasing activation time and was observed up to 78% at 973 K. This indicates that butane activity and retentivity could be a function not only of the specific surface area or total pore volume, but also of the mesopore volume fraction in the range of 2.8–3.8 nm and 5.5-6.5 nm of adsorbents, respectively. The AKC exhibit enhanced butane working capacity compared to commercial activated carbon with the high performance of butane working capacity due to its pore structure having a high mesopore ratio.

ACS Style

Byeong-Hoon Lee; Hye-Min Lee; Dong Chung; Byung-Joo Kim. Effect of Mesopore Development on Butane Working Capacity of Biomass-Derived Activated Carbon for Automobile Canister. Nanomaterials 2021, 11, 673 .

AMA Style

Byeong-Hoon Lee, Hye-Min Lee, Dong Chung, Byung-Joo Kim. Effect of Mesopore Development on Butane Working Capacity of Biomass-Derived Activated Carbon for Automobile Canister. Nanomaterials. 2021; 11 (3):673.

Chicago/Turabian Style

Byeong-Hoon Lee; Hye-Min Lee; Dong Chung; Byung-Joo Kim. 2021. "Effect of Mesopore Development on Butane Working Capacity of Biomass-Derived Activated Carbon for Automobile Canister." Nanomaterials 11, no. 3: 673.

Journal article
Published: 26 June 2020 in Polymers
Reads 0
Downloads 0

Surface enhancement of components is vital for achieving superior properties in a composite system. In this study, carbon nanotubes (CNTs) were grown on carbon fiber (CF) substrates to improve the surface area and, in turn, increase the adhesion between epoxy-resin and CFs. Nickel (Ni) was used as the catalyst in CNT growth, and was coated on CF sheets via the electroplating method. Surface energetics of CNT-grown CFs and their work of adhesion with epoxy resin were measured. SEM and TEM were used to analyze the morphology of the samples. After the optimization of surface energetics by catalyst weight ratio (15 wt.% Ni), CF-reinforced plastic (CFRP) samples were prepared using the hand lay-up method. To validate the effect of chemical vapor deposition (CVD)-grown CNTs on CFRP properties, samples were also prepared where CNT powder was added to epoxy prior to reinforcement with Ni-coated CFs. CFRP specimens were tested to determine their electrical resistivity, flexural strength, and ductility index. The electrical resistivity of CNT-grown CFRP was found to be about 9 and 2.3 times lower than those of as-received CFRP and CNT-added Ni-CFRP, respectively. Flexural strength of CNT-grown Ni-CFRP was enhanced by 52.9% of that of as-received CFRP. Interestingly, the ductility index in CNT-grown Ni-CFRP was 40% lower than that of CNT-added Ni-CFRP. This was attributed to the tip-growth formation of CNTs and the breakage of Ni coating.

ACS Style

Arash Badakhsh; Kay-Hyeok An; Byung-Joo Kim. Enhanced Surface Energetics of CNT-Grafted Carbon Fibers for Superior Electrical and Mechanical Properties in CFRPs. Polymers 2020, 12, 1432 .

AMA Style

Arash Badakhsh, Kay-Hyeok An, Byung-Joo Kim. Enhanced Surface Energetics of CNT-Grafted Carbon Fibers for Superior Electrical and Mechanical Properties in CFRPs. Polymers. 2020; 12 (6):1432.

Chicago/Turabian Style

Arash Badakhsh; Kay-Hyeok An; Byung-Joo Kim. 2020. "Enhanced Surface Energetics of CNT-Grafted Carbon Fibers for Superior Electrical and Mechanical Properties in CFRPs." Polymers 12, no. 6: 1432.

Journal article
Published: 23 January 2020 in Catalysts
Reads 0
Downloads 0

As bisphenol A has been found to cause hormonal disturbances, the natural biomaterial isosorbide is emerging as a substitute. In this study, a method for isosorbide synthesis from sorbitol was proposed by dehydration under high temperature and high pressure reaction. Microporous zeolites and Amberlyst 35 solid acids with various acid strengths and pore characteristics were applied as catalysts. In the synthesis of isosorbide from sorbitol, the acidity of the catalyst was the main factor. MOR and MFI zeolite catalysts with high acid strength and small pore size showed low conversion of sorbitol and low yield of isosorbide. On the other hand, the conversion of sorbitol was high in BEA zeolite with moderate acid strength. Amberlyst 35 solid acid catalysts showed a relatively high conversion of sorbitol, but low yield of isosorbide. The Amberlyst 35 solid acid catalyst without micropores did not show any inhibitory effects on the production of by-products. However, in the BEA zeolite catalyst, which has a relatively large pore structure compared with the MOR and MFI zeolites, the formation of by-products was suppressed in the pores, thereby improving the yield of isosorbide.

ACS Style

Sangmin Jeong; Ki-Joon Jeon; Young-Kwon Park; Byung-Joo Kim; Kyong-Hwan Chung; Sang-Chul Jung. Catalytic Properties of Microporous Zeolite Catalysts in Synthesis of Isosorbide from Sorbitol by Dehydration. Catalysts 2020, 10, 148 .

AMA Style

Sangmin Jeong, Ki-Joon Jeon, Young-Kwon Park, Byung-Joo Kim, Kyong-Hwan Chung, Sang-Chul Jung. Catalytic Properties of Microporous Zeolite Catalysts in Synthesis of Isosorbide from Sorbitol by Dehydration. Catalysts. 2020; 10 (2):148.

Chicago/Turabian Style

Sangmin Jeong; Ki-Joon Jeon; Young-Kwon Park; Byung-Joo Kim; Kyong-Hwan Chung; Sang-Chul Jung. 2020. "Catalytic Properties of Microporous Zeolite Catalysts in Synthesis of Isosorbide from Sorbitol by Dehydration." Catalysts 10, no. 2: 148.

Journal article
Published: 26 December 2019 in Nanomaterials
Reads 0
Downloads 0

In this study, a plasma in a liquid process (PiLP) was used to facilely precipitate bimetallic nanoparticles composed of Ni and Co elements on the surface of activated carbon. The physicochemical and electrochemical properties of the fabricated composites were evaluated to examine the potential of supercapacitors as electrode materials. Nickel and cobalt ions in the aqueous reactant solution were uniformly precipitated on the AC surface as spherical nanoparticles with a size of about 100 nm by PiLP reaction. The composition of nanoparticles was determined by the molar ratio of nickel and cobalt precursors and precipitated in the form of bimetallic oxide. The electrical conductivity and specific capacitance were increased by Ni-Co bimetallic oxide nanoparticles precipitated on the AC surface. In addition, the electrochemical performance was improved by stable cycling stability and resistance reduction and showed the best performance when the molar ratios of Ni and Co precursors were the same.

ACS Style

Heon Lee; In-Soo Park; Young-Kwon Park; Kay-Hyeok An; Byung-Joo Kim; Sang-Chul Jung. Facile Preparation of Ni-Co Bimetallic Oxide/Activated Carbon Composites Using the Plasma in Liquid Process for Supercapacitor Electrode Applications. Nanomaterials 2019, 10, 61 .

AMA Style

Heon Lee, In-Soo Park, Young-Kwon Park, Kay-Hyeok An, Byung-Joo Kim, Sang-Chul Jung. Facile Preparation of Ni-Co Bimetallic Oxide/Activated Carbon Composites Using the Plasma in Liquid Process for Supercapacitor Electrode Applications. Nanomaterials. 2019; 10 (1):61.

Chicago/Turabian Style

Heon Lee; In-Soo Park; Young-Kwon Park; Kay-Hyeok An; Byung-Joo Kim; Sang-Chul Jung. 2019. "Facile Preparation of Ni-Co Bimetallic Oxide/Activated Carbon Composites Using the Plasma in Liquid Process for Supercapacitor Electrode Applications." Nanomaterials 10, no. 1: 61.

Journal article
Published: 04 December 2019 in Polymers
Reads 0
Downloads 0

The purpose of this study is to prepare boron nitride (BN)-coated carbon fibers (CF) and to investigate the properties of as-prepared fibers as well as the effect of coating on their respective polymer–matrix composites. A sequence of solution dipping and heat treatment was performed to blanket the CFs with a BN microlayer. The CFs were first dipped in a boric acid solution and then annealed in an ammonia–nitrogen mixed gas atmosphere for nitriding. The presence of BN on the CF surface was confirmed using FTIR, XPS, and SEM analyses. Polypropylene was reinforced with BN–CFs as the first filler and graphite flake as the secondary filler. The composite characterization indicates approximately 60% improvement in through-plane thermal conductivity and about 700% increase in the electrical resistivity of samples containing BN-CFs at 20 phr. An increase of two orders of magnitude in the electrical resistivity of BN–CF monofilaments was also observed.

ACS Style

Arash Badakhsh; Woong Han; Sang-Chul Jung; Kay-Hyeok An; Byung-Joo Kim. Preparation of Boron Nitride-Coated Carbon Fibers and Synergistic Improvement of Thermal Conductivity in Their Polypropylene-Matrix Composites. Polymers 2019, 11, 2009 .

AMA Style

Arash Badakhsh, Woong Han, Sang-Chul Jung, Kay-Hyeok An, Byung-Joo Kim. Preparation of Boron Nitride-Coated Carbon Fibers and Synergistic Improvement of Thermal Conductivity in Their Polypropylene-Matrix Composites. Polymers. 2019; 11 (12):2009.

Chicago/Turabian Style

Arash Badakhsh; Woong Han; Sang-Chul Jung; Kay-Hyeok An; Byung-Joo Kim. 2019. "Preparation of Boron Nitride-Coated Carbon Fibers and Synergistic Improvement of Thermal Conductivity in Their Polypropylene-Matrix Composites." Polymers 11, no. 12: 2009.

Journal article
Published: 16 November 2019 in Catalysts
Reads 0
Downloads 0

Acetylsalicylic acid (ASA) is a pharmacologically active compound. In this study, ASA was decomposed effectively using a plasma in liquid phase process with hydrogen peroxide and TiO2 photocatalyst. Increasing the electrical power conditions (frequency, applied voltage, and pulse width) promoted plasma generation, which increased the rate of ASA decomposition. The added hydrogen peroxide increased the rate of ASA degradation, but injecting an excess decreased the degradation rate due to a scavenger effect. Although there was an initial increase in the decomposition efficiency by the addition of TiO2 powder, the addition of an excessive amount inhibited the generation of plasma and decreased the degradation rate. The simultaneous addition of H2O2 and TiO2 powder resulted in the highest degradation efficiency. We suggest that ASA is converted to salicylic acid through demethylation by hydroxyl radicals and is finally mineralized to carbon dioxide and water via 2,4-dihydroxy benzoic acid and low molecular acids.

ACS Style

Hye-Jin Bang; Heon Lee; Young-Kwon Park; Hyung-Ho Ha; Young Hyun Yu; Byung-Joo Kim; Sang-Chul Jung. Assessment of Degradation Behavior for Acetylsalicylic Acid Using a Plasma in Liquid Process. Catalysts 2019, 9, 965 .

AMA Style

Hye-Jin Bang, Heon Lee, Young-Kwon Park, Hyung-Ho Ha, Young Hyun Yu, Byung-Joo Kim, Sang-Chul Jung. Assessment of Degradation Behavior for Acetylsalicylic Acid Using a Plasma in Liquid Process. Catalysts. 2019; 9 (11):965.

Chicago/Turabian Style

Hye-Jin Bang; Heon Lee; Young-Kwon Park; Hyung-Ho Ha; Young Hyun Yu; Byung-Joo Kim; Sang-Chul Jung. 2019. "Assessment of Degradation Behavior for Acetylsalicylic Acid Using a Plasma in Liquid Process." Catalysts 9, no. 11: 965.

Original article
Published: 17 October 2019 in Carbon Letters
Reads 0
Downloads 0

In this work, the correlation between the pore characteristics of activated carbon (AC) and the adsorption/desorption characteristics of evaporated fuel was studied. AC was prepared by various physical re-activation methods using coconut-derived commercial AC. Pore characteristics of the re-activated AC were investigated using N2/77 K adsorption isotherms. The structural characteristics of the AC were observed by X-ray diffraction and Raman spectroscopy. The butane working capacity was observed according to ASTM D5228. From the results, the specific surface area and total pore volume of the ACs were determined to be 1380–2040 m2/g and 0.60–0.96 cm3/g, respectively. It was also observed that various pore size distributions were found to be dependent on the functions of the activation method and time. A close relationship between butane activity/retentivity and micropore/mesopore volumes was found. In addition, it was inferred that the volume fraction of micropores and sub-mesopores with diameters between 1.5 and 3.0 nm primarily controls butane activity.

ACS Style

Hye-Min Lee; Byeong-Hoon Lee; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. Facile preparation of activated carbon with optimal pore range for high butane working capacity. Carbon Letters 2019, 30, 297 -305.

AMA Style

Hye-Min Lee, Byeong-Hoon Lee, Kay-Hyeok An, Soo-Jin Park, Byung-Joo Kim. Facile preparation of activated carbon with optimal pore range for high butane working capacity. Carbon Letters. 2019; 30 (3):297-305.

Chicago/Turabian Style

Hye-Min Lee; Byeong-Hoon Lee; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. 2019. "Facile preparation of activated carbon with optimal pore range for high butane working capacity." Carbon Letters 30, no. 3: 297-305.

Journal article
Published: 14 September 2019 in Nanomaterials
Reads 0
Downloads 0

The unburned hydrocarbon (HC) emissions of automobiles are subject to strong regulations because they are known to be converted into fine dust, ozone, and photochemical smog. Pitch-based activated carbon fibers (ACF) prepared by steam activation can be a good solution for HC removal. The structural characteristics of ACF were observed using X-ray diffraction. The pore characteristics were investigated using N2/77K adsorption isotherms. The butane working capacity (BWC) was determined according to ASTM D5228. From the results, the specific surface area and total pore volume of the ACF were determined to be 840–2630 m2/g and 0.33–1.34 cm3/g, respectively. The butane activity and butane retentivity of the ACF increased with increasing activation time and were observed to range between 15.78–57.33% and 4.19–11.47%, respectively. This indicates that n-butane adsorption capacity could be a function not only of the specific surface area or total pore volume but also of the sub-mesopore volume fraction in the range of 2.0–2.5 nm of adsorbents. The ACF exhibit enhanced BWC, and especially adsorption velocity, compared to commercial products (granules and pellets), with lower concentrations of n-butane due to a uniformly well-developed pore structure open directly to the outer surface.

ACS Style

Hye-Min Lee; Byeong-Hoon Lee; Soo-Jin Park; Kay-Hyeok An; Byung-Joo Kim. Pitch-Derived Activated Carbon Fibers for Emission Control of Low-Concentration Hydrocarbon. Nanomaterials 2019, 9, 1313 .

AMA Style

Hye-Min Lee, Byeong-Hoon Lee, Soo-Jin Park, Kay-Hyeok An, Byung-Joo Kim. Pitch-Derived Activated Carbon Fibers for Emission Control of Low-Concentration Hydrocarbon. Nanomaterials. 2019; 9 (9):1313.

Chicago/Turabian Style

Hye-Min Lee; Byeong-Hoon Lee; Soo-Jin Park; Kay-Hyeok An; Byung-Joo Kim. 2019. "Pitch-Derived Activated Carbon Fibers for Emission Control of Low-Concentration Hydrocarbon." Nanomaterials 9, no. 9: 1313.

Rapid communications
Published: 28 August 2019 in Carbon Letters
Reads 0
Downloads 0

In this study, we prepared ACFs with a high specific surface area from various precursors (rayon, pitch, and oxidized polyacrylonitrile-based fibers) by a steam-activation technique and investigated the effects of the micropore and mesopore fraction on 2-CEES adsorption behaviors. The activation time was precisely controlled so that the activation yield was in the range of 35–40% to ensure the mechanical properties of the ACFs. The N2 adsorption isotherm characteristics at 77K were confirmed by Brunauer–Emmett–Teller, Barrett–Joyner–Halenda and non-local density functional theory equations. The adsorption capacities of the ACF were measured by breakthrough experiments in the gas phase (750 μg/mL of 2-CEES in N2 flow). The removal efficiency of the ACFs was evaluated and compared with that of AC. From the results, specific surface areas and total pore volume of the ACF were determined to be 1380–1670 m2/g and 0.61–0.82 cm3/g, respectively. It was also observed that various pore characteristics of ACF were found to be dependent on crystallite structure of each precursor. The break through time (C/C0 = 0.10) was in the order of Oxi-Pan-H-9-2 < Saratoga AC < Rayon-H-9-3 < Pitch-H-9-4. This indicates that 2-CEES adsorption capacity could be a function not only of specific surface area or total pore volume, but also of sub-mesopore volume fraction in the range of 1.5–2.5 nm of adsorbents.

ACS Style

Hye-Min Lee; Byeong-Hoon Lee; Ju-Hwan Kim; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. Determination of the optimum porosity for 2-CEES adsorption by activated carbon fiber from various precursors. Carbon Letters 2019, 29, 649 -654.

AMA Style

Hye-Min Lee, Byeong-Hoon Lee, Ju-Hwan Kim, Kay-Hyeok An, Soo-Jin Park, Byung-Joo Kim. Determination of the optimum porosity for 2-CEES adsorption by activated carbon fiber from various precursors. Carbon Letters. 2019; 29 (6):649-654.

Chicago/Turabian Style

Hye-Min Lee; Byeong-Hoon Lee; Ju-Hwan Kim; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. 2019. "Determination of the optimum porosity for 2-CEES adsorption by activated carbon fiber from various precursors." Carbon Letters 29, no. 6: 649-654.

Journal article
Published: 09 July 2019 in Journal of Environmental Management
Reads 0
Downloads 0

In this work, we report a fast recycling process for carbon fiber-reinforced thermosetting resin matrix composites, to obtain recycled carbon fibers. Steam (H2O) was selected as an oxidant to decompose the resin of the composites. The recycling reaction temperature and time were set in the range of 600–800 °C and 60 min, respectively. The recovery yield, surface morphologies, and mechanical properties including tensile strength and modulus of the recovered fibers were measured to evaluate the recycling efficiency. Microstructural properties of the recycled fiber were observed by X-ray studies, and the correlation of mechanical properties of the fibers with crystallite size and distribution was also evaluated. In conclusion, the carbon fibers were successfully recycled, while retaining 65% and 100% of the fibers’ original tensile strength and modulus, respectively. 100% recovery yield was achieved in 60 min of decomposition time and 140 min of total process time.

ACS Style

Jin-Soo Jeong; Kwan-Woo Kim; Kay-Hyeok An; Byung-Joo Kim. Fast recovery process of carbon fibers from waste carbon fibers-reinforced thermoset plastics. Journal of Environmental Management 2019, 247, 816 -821.

AMA Style

Jin-Soo Jeong, Kwan-Woo Kim, Kay-Hyeok An, Byung-Joo Kim. Fast recovery process of carbon fibers from waste carbon fibers-reinforced thermoset plastics. Journal of Environmental Management. 2019; 247 ():816-821.

Chicago/Turabian Style

Jin-Soo Jeong; Kwan-Woo Kim; Kay-Hyeok An; Byung-Joo Kim. 2019. "Fast recovery process of carbon fibers from waste carbon fibers-reinforced thermoset plastics." Journal of Environmental Management 247, no. : 816-821.

Journal article
Published: 02 July 2019 in Composites Part B: Engineering
Reads 0
Downloads 0

Improving the utilization of industrial thermal waste and abundant solar thermal energy is of immense significance in energy management and thermal engineering. Latent heat thermal storage is one of the emerging methods that employ the large caloric density of materials mainly as a result of its constant-temperature phase-change process. Herein, paraffin was selected as the phase-change matrix which was reinforced with length controlled-carbon nanotubes (LCCNTs) as the primary filler and graphene nanoplatelets (GNPs) as the secondary reinforcing nanoparticles. Electrical conductivity (EC) of samples was tested, and carbon nanotube (CNT) was proved to be more effective in the increase of EC, than GNP. Furthermore, the thermal conductivity of the fabricated composite phase-change material was measured, and at the filler ratio of 5 phr an enhancement of about 148.0% was found compared with that of pristine paraffin. Optimal CNT/GNP ratios were also determined at the maximum enhancement achieved for each property. To observe the effect of LCCNTs on the mechanical properties of composites, polyester resin-based composites were prepared, and the tensile strength results are reported.

ACS Style

Arash Badakhsh; Young-Min Lee; Kyong Yop Rhee; Chan Woo Park; Kay-Hyeok An; Byung-Joo Kim. Improvement of thermal, electrical and mechanical properties of composites using a synergistic network of length controlled-CNTs and graphene nanoplatelets. Composites Part B: Engineering 2019, 175, 107075 .

AMA Style

Arash Badakhsh, Young-Min Lee, Kyong Yop Rhee, Chan Woo Park, Kay-Hyeok An, Byung-Joo Kim. Improvement of thermal, electrical and mechanical properties of composites using a synergistic network of length controlled-CNTs and graphene nanoplatelets. Composites Part B: Engineering. 2019; 175 ():107075.

Chicago/Turabian Style

Arash Badakhsh; Young-Min Lee; Kyong Yop Rhee; Chan Woo Park; Kay-Hyeok An; Byung-Joo Kim. 2019. "Improvement of thermal, electrical and mechanical properties of composites using a synergistic network of length controlled-CNTs and graphene nanoplatelets." Composites Part B: Engineering 175, no. : 107075.

Journal article
Published: 19 June 2019 in Nanomaterials
Reads 0
Downloads 0

In this study, low-density polyethylene (LDPE)-derived activated carbons (PE-AC) were prepared as electrode materials for an electric double-layer capacitor (EDLC) by techniques of cross-linking, carbonization, and subsequent activation under various conditions. The surface morphologies and structural characteristics of the PE-AC were observed by field-emission scanning electron microscope, Cs-corrected field-emission transmission electron microscope, and X-ray diffraction analysis, respectively. The nitrogen adsorption isotherm-desorption characteristics were confirmed by Brunauer–Emmett–Teller, nonlocal density functional theory, and Barrett–Joyner–Halenda equations at 77 K. The results showed that the specific surface area and total pore volume of the activated samples increased with increasing the activation time. The specific surface area, the total pore volume, and mesopore volume of the PE-AC were found to be increased finally to 1600 m2/g, 0.86 cm3/g, and 0.3 cm3/g, respectively. The PE-AC also exhibited a high mesopore volume ratio of 35%. This mesopore-rich characteristic of the activated carbon from the LDPE is considered to be originated from the cross-linking density and crystallinity of precursor polymer. The high specific surface area and mesopore volume of the PE-AC led to their excellent performance as EDLC electrodes, including a specific capacitance of 112 F/g.

ACS Style

Hye-Min Lee; Kwan-Woo Kim; Young-Kwon Park; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. Activated Carbons from Thermoplastic Precursors and Their Energy Storage Applications. Nanomaterials 2019, 9, 896 .

AMA Style

Hye-Min Lee, Kwan-Woo Kim, Young-Kwon Park, Kay-Hyeok An, Soo-Jin Park, Byung-Joo Kim. Activated Carbons from Thermoplastic Precursors and Their Energy Storage Applications. Nanomaterials. 2019; 9 (6):896.

Chicago/Turabian Style

Hye-Min Lee; Kwan-Woo Kim; Young-Kwon Park; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. 2019. "Activated Carbons from Thermoplastic Precursors and Their Energy Storage Applications." Nanomaterials 9, no. 6: 896.

Original article
Published: 08 June 2019 in Carbon Letters
Reads 0
Downloads 0

In this study, activated carbon with well-developed mesopores was fabricated using kenaf short fibers as a representative biomass. Concentrated phosphoric acid was selected as an activation agent to create highly developed porous structures, and pore development was observed to occur in relation to the weight ratio of phosphoric acid and kenaf. The pore characteristics of the kenaf-based activated carbon were determined using the N2/77K adsorption isotherm, and its microcrystalline structure was analyzed using X-ray diffraction. The highest specific surface area (1570 m2/g) was observed when the weight ratio of phosphoric acid to kenaf was 3:1, and the highest mesopore fraction (74%) was observed at 4:1. The carbonization yield was 45–35%, which is higher than that of commercial activated carbon. The production of porous carbon material by this method offers high potential for application because it can be controlled over a wide range of average pore diameter from 2.48 to 5.44 nm.

ACS Style

Jin Baek; Hye-Min Lee; Kay-Hyeok An; Byung-Joo Kim. Preparation and characterization of highly mesoporous activated short carbon fibers from kenaf precursors. Carbon Letters 2019, 29, 393 -399.

AMA Style

Jin Baek, Hye-Min Lee, Kay-Hyeok An, Byung-Joo Kim. Preparation and characterization of highly mesoporous activated short carbon fibers from kenaf precursors. Carbon Letters. 2019; 29 (4):393-399.

Chicago/Turabian Style

Jin Baek; Hye-Min Lee; Kay-Hyeok An; Byung-Joo Kim. 2019. "Preparation and characterization of highly mesoporous activated short carbon fibers from kenaf precursors." Carbon Letters 29, no. 4: 393-399.

Journal article
Published: 12 April 2019 in Nanomaterials
Reads 0
Downloads 0

In this study, activated polymer-based hard carbon using steam activation (APHS) with mesopore-rich pore structures were prepared for application as electrodes in electrical double-layer capacitors (EDLC). The surface morphologies and structural characteristics of APHS were observed using scanning electron microscopy and X-ray diffraction analysis, respectively. The textural properties were described using Brunauer-Emmett-Teller and Barrett-Joyner-Halenda equations with N2/77 K adsorption isotherms. APHS were prepared under various steam activation conditions to find optimal ones, which were then applied as electrode materials for the EDLC. The observed specific surface areas and total pore volumes of the APHS were in the range 1170-2410 m2/g and 0.48-1.22 cm3/g, respectively. It was observed that pore size distribution mainly depended on the activation time and temperature, and that the volume of pores with size of 1.5-2.5 nm was found to be a key factor determining the electrochemical capacity.

ACS Style

Hye-Min Lee; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim; Lee; An; Park; Kim. Mesopore-Rich Activated Carbons for Electrical Double-Layer Capacitors by Optimal Activation Condition. Nanomaterials 2019, 9, 608 .

AMA Style

Hye-Min Lee, Kay-Hyeok An, Soo-Jin Park, Byung-Joo Kim, Lee, An, Park, Kim. Mesopore-Rich Activated Carbons for Electrical Double-Layer Capacitors by Optimal Activation Condition. Nanomaterials. 2019; 9 (4):608.

Chicago/Turabian Style

Hye-Min Lee; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim; Lee; An; Park; Kim. 2019. "Mesopore-Rich Activated Carbons for Electrical Double-Layer Capacitors by Optimal Activation Condition." Nanomaterials 9, no. 4: 608.

Journal article
Published: 03 April 2019 in Nanomaterials
Reads 0
Downloads 0

In this study, isotropic pitch-based carbon fibers were prepared from a mixture of petroleum residue and graphene nanoplatelets with different contents. The softening point and synthetic yield of synthesized isotropic pitches were analyzed and compared to characterize the nature of the pitches. The surface and thermal characteristics of the fibers were observed using scanning electron microscopy and thermogravimetric analysis (TGA), respectively. From the results, it was observed that the prepared carbon fibers had an interesting core-shell structure. In the TGA analysis with air, the carbon fiber having 0.1 wt.% of graphene showed a higher residue yield than that of the sample having 1.0 wt.% of graphene. This result can be explained due to the graphene being placed on the surface region of the carbon fibers and directly helping to increase the surface area of the carbon fibers, resulting in rapid oxidation due to the enhanced contact area with oxygen.

ACS Style

Dong Hun Lee; Yong-Hwan Choi; Kyong Yop Rhee; Kap Seung Yang; Byung-Joo Kim. Facile Preparation and Characterization of Carbon Fibers with Core-Shell Structure from Graphene-Dispersed Isotropic Pitch Compounds. Nanomaterials 2019, 9, 521 .

AMA Style

Dong Hun Lee, Yong-Hwan Choi, Kyong Yop Rhee, Kap Seung Yang, Byung-Joo Kim. Facile Preparation and Characterization of Carbon Fibers with Core-Shell Structure from Graphene-Dispersed Isotropic Pitch Compounds. Nanomaterials. 2019; 9 (4):521.

Chicago/Turabian Style

Dong Hun Lee; Yong-Hwan Choi; Kyong Yop Rhee; Kap Seung Yang; Byung-Joo Kim. 2019. "Facile Preparation and Characterization of Carbon Fibers with Core-Shell Structure from Graphene-Dispersed Isotropic Pitch Compounds." Nanomaterials 9, no. 4: 521.

Journal article
Published: 22 February 2019 in Composites Part B: Engineering
Reads 0
Downloads 0

In this study, surface defects and the surface layer of carbon fibers (CFs) were etched using a well-known electrochemical oxidation method to enhance the CFs’ mechanical properties. The CFs were etched using ammonium bicarbonate as an electrolyte, and the change in surface properties, microstructures, and mechanical strength were evaluated after the treatment. The mechanical interfacial strength of the modified CFs were also investigated in terms of interfacial shear strength (IFSS). Depending on the process conditions, it was found that the surface roughness, average surface charge, and/or surface free energies of the CFs were changed dynamically. The tensile strength and IFSS of the CFs increased significantly in a certain range after etching. The electrochemical modification of the CFs in this work was understood to mainly remove surface defects and amorphous structure, while enhancing various surface functional groups and crystalline-rich microstructures.

ACS Style

Kwan-Woo Kim; Jin-Soo Jeong; Kay-Hyeok An; Byung-Joo Kim. A study on the microstructural changes and mechanical behaviors of carbon fibers induced by optimized electrochemical etching. Composites Part B: Engineering 2019, 165, 764 -771.

AMA Style

Kwan-Woo Kim, Jin-Soo Jeong, Kay-Hyeok An, Byung-Joo Kim. A study on the microstructural changes and mechanical behaviors of carbon fibers induced by optimized electrochemical etching. Composites Part B: Engineering. 2019; 165 ():764-771.

Chicago/Turabian Style

Kwan-Woo Kim; Jin-Soo Jeong; Kay-Hyeok An; Byung-Joo Kim. 2019. "A study on the microstructural changes and mechanical behaviors of carbon fibers induced by optimized electrochemical etching." Composites Part B: Engineering 165, no. : 764-771.

Journal article
Published: 22 January 2019 in Chemical Engineering Journal
Reads 0
Downloads 0

In this work, activated polymer-based hard carbons (APHS) with high specific surface area and pore volume were prepared by optimizing the carbonization temperature prior to H2O activation. Structural properties were studied using Raman and X-ray diffraction. N2 adsorption–desorption isotherm characteristics at 77 K were confirmed using the Brunauer-Emmett-Teller equations. APHS were applied as an electrode for electrical double layer capacitors (EDLC). From the results, the specific surface area and total pore volume of the APHSs were determined to be 1760–2340 m2/g and 0.86–1.20 cm3/g, respectively, according to the carbonization temperature. It was revealed that the pore structure depended on the functions of crystallinity and carbonization temperature. The EDLC performance of the prepared APHS was found to be 127 F/g and 50 F/cc for APHS-7-9-4. This is 14% better performance than with commercial YP50F (95 F/g, 44 F/cc). From these results, it was confirmed that the energy storage characteristics of APHS depend strongly on the crystal size, which varies according to the initial conditions of the hard carbon production.

ACS Style

Hye-Min Lee; Dong-Cheol Chung; Sang-Chul Jung; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. A study on pore development mechanism of activated carbons from polymeric precursor: Effects of carbonization temperature and nano crystallite formation. Chemical Engineering Journal 2019, 377, 120836 .

AMA Style

Hye-Min Lee, Dong-Cheol Chung, Sang-Chul Jung, Kay-Hyeok An, Soo-Jin Park, Byung-Joo Kim. A study on pore development mechanism of activated carbons from polymeric precursor: Effects of carbonization temperature and nano crystallite formation. Chemical Engineering Journal. 2019; 377 ():120836.

Chicago/Turabian Style

Hye-Min Lee; Dong-Cheol Chung; Sang-Chul Jung; Kay-Hyeok An; Soo-Jin Park; Byung-Joo Kim. 2019. "A study on pore development mechanism of activated carbons from polymeric precursor: Effects of carbonization temperature and nano crystallite formation." Chemical Engineering Journal 377, no. : 120836.