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401.

Preparation of sulfonated reduced graphene oxide by radiationinduced chemical reduction of sulfonated graphene oxide

Chang-Hee Jung, Ji-Hyun Hong, Jin-Mook Jung, In-Tae Hwang, Chan-Hee Jung and Jae-Hak Choi 한국탄소학회 Carbon Letters 4 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 6 41-44 (4 pages)

Chang-Hee Jung, Ji-Hyun Hong, Jin-Mook Jung, In-Tae Hwang, Chan-Hee Jung and Jae-Hak Choi 저
...
- 1,500원
We report the preparation of sulfonated reduced graphene oxide (SRGO) by the sulfonation of graphene oxide followed by radiation-induced chemical reduction. Graphene oxide prepared by the well-known modified Hummer's method was sulfonated with the aryl diazonium salt of sulfanilic acid. Sulfonated graphene oxide (SGO) dispersed in ethanol was subsequently reduced by γ-ray irradiation at various absorbed doses to produce SRGO. The results of optical, chemical, and thermal analyses revealed that...
402.

Effect of surface treatment of graphene nanoplatelets for improvement of thermal and electrical properties of epoxy composites

Minjae Kim, Yeongseon Kim, Sung Hyeon Baeck and Sang Eun Shim 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 5 34-40 (7 pages)

Minjae Kim, Yeongseon Kim, Sung Hyeon Baeck and Sang Eun Shim 저
...
- 3,000원
In this study, in order to improve the thermal and electrical properties of epoxy/graphene nanoplatelets (GNPs), surface modifications of GNPs are conducted using silane coupling agents. Three silane coupling agents, i.e. 2-(3,4-epoxycyclohexyl)-ethyltrimethoxysilane (ETMOS), 3-glycidoxypropyltriethoxysilane (GPTS), and 3-glycidoxypropyltrimethoxysilane (GPTMS), were used. Among theses, GPTMS exhibits the best modification performance for fabricating GNP-incorporated epoxy composites. The effect...
403.

An overview of new oxidation methods for polyacrylonitrile?based carbon fibers

Hye Kyoung Shin, Mira Park, Hak-Yong Kim and Soo-Jin Park 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 2 11-18 (8 pages)

Hye Kyoung Shin, Mira Park, Hak-Yong Kim and Soo-Jin Park 저
...
- 3,000원
state prior to carbonization. This represents one of the most important stages in determining the mechanical properties of the final carbon fibers, but the most commonly used methods, such as thermal treatment (200°C to 300°C), tend to waste a great deal of process time, money, and energy. There is therefore a need to develop more advanced oxidation methods for PAN precursor fibers. In this review, we assess the viability of electron beam, gamma-ray, ultra-violet, and plasma treatments with a...
404.

Carbon nanotubes synthesis using diffusion and premixed flame methods: a review

Garima Mittal, Vivek Dhand, Kyong Yop Rhee, Hyeon-Ju Kim and Dong Ho Jung 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2015, Vol.16 No.1 1 1-10 (10 pages)

Garima Mittal, Vivek Dhand, Kyong Yop Rhee, Hyeon-Ju Kim and Dong Ho Jung 저
...
- 3,000원
In recent years, flame synthesis has absorbed a great deal of attention as a combustion method for the production of metal oxide nanoparticles, carbon nanotubes, and other related carbon nanostructures, over the existing conventional methods. Flame synthesis is an energyefficient, scalable, cost-effective, rapid and continuous process, where flame provides the necessary chemical species for the nucleation of carbon structures (feed stock or precursor) and the energy for the production of carbon...
405.

Effects of comonomer with carboxylic group on stabilization of high molecular weight polyacrylonitrile nanofibrous copolymers

Danyun Lei, Kesavan Devarayan1, Xiang-Dan Li, Woong-Ki Choi, Min-Kang Seo and Byoung-Suhk Kim 한국탄소학회 Carbon Letters 5 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 9 290-294 (5 pages)

Danyun Lei, Kesavan Devarayan1, Xiang-Dan Li, Woong-Ki Choi, Min-Kang Seo and Byoung-Suhk Kim 저
...
- 1,500원
New precursors, poly(acrylonitrile-co-crotonic acid) (poly(AN-CA)) and poly(acrylonitrile-co-itaconic acid-co-crotonic acid) (poly(AN-IA-CA)) copolymers, for the preparation of carbon fibers, were explored in this study. The effects of comonomers with acidic groups, such as crotonic acid (CA) and/or itaconic acid (IA), on the stabilization of nanofibrous polyacrylonitrile (PAN) copolymers were studied. The extent of stabilization, evaluated by Fourier transform infrared spectroscopy, revealed...
406.

Thermal properties in strong hydrogen bonding systems composed of poly(vinyl alcohol), polyethyleneimine, and graphene oxide

Sua Choi, Duck Kun Hwang and Heon Sang Lee 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 8 282-289 (8 pages)

Sua Choi, Duck Kun Hwang and Heon Sang Lee 저
...
- 3,000원
Blends of poly(vinyl alcohol) (PVA), polyethyleneimine (PEI), and graphene oxide (GO) were prepared by solution casting method. Calorimetric thermal properties of the blends were investigated. The Tgs of PVA/PEI blends were higher than the Tgs of either of the component polymers at low concentrations of PEI. These abnormal increases of Tgs may be due to the negative entropy of mixing which is associated with strong hydrogen bonding between PVA and PEI. The degree of depression of s was not...
407.

Novel reforming of pyrolized fuel oil by electron beam radiation for pitch production

Jin-Young Jung, Mi-Seon Park, Min Il Kim and Young-Seak Lee 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 5 262-267 (6 pages)

Jin-Young Jung, Mi-Seon Park, Min Il Kim and Young-Seak Lee 저
...
- 3,000원
Pyrolized fuel oil (PFO) was reformed by novel electron beam (E-beam) radiation, and the elemental composition, chemical bonds, average molecular weight, solubility, softening point, yields, and density of the modified patches were characterized. These properties of modified pitch were dependent on the reforming method (heat or E-beam radiation treatment) and absorbed dose. Aromaticity (Fa), average molecular weight, solubility, softening point, and density increased in proportion to the...
408.

Properties of multi-walled carbon nanotube reinforced epoxy composites fabricated by using sonication and shear mixing

Min Ye Koo, Hon Chung Shin, Won-Seok Kim and Gyo Woo Lee 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 4 255-261 (7 pages)

Min Ye Koo, Hon Chung Shin, Won-Seok Kim and Gyo Woo Lee 저
...
- 3,000원
Multi-walled carbon nanotube reinforced epoxy composites were fabricated using shear mixing and sonication. The mechanical, viscoelastic, thermal, and electrical properties of the fabricated specimens were measured and evaluated. From the images and the results of the measurements of tensile strengths, the specimens having 0.6 wt% nanotube content showed better dispersion and higher strength than those of the other specimens. The Young’s moduli of the specimens increased as the nanotube filler...
409.

Modification of isotropic coal-tar pitch by acid treatments for carbon fiber melt-spinning

Mi Jung Yoo, Hyo Jun Ko, Yun-Soo Lim and Myung-Soo Kim 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.4 3 247-254 (8 pages)

Mi Jung Yoo, Hyo Jun Ko, Yun-Soo Lim and Myung-Soo Kim 저
...
- 3,000원
In this work, thermal treatment accompanied with different acid treatments was applied to a commercial coal tar pitch (CTP) to obtain a spinnable precursor pitch for carbon fiber. In the case of thermal treatment only, a relatively high reaction temperature of between 380°C and 400°C was required to obtain a softening point (SP) range of 220°C-260°C and many meso-phase particles were created during the application of high reaction temperature. When nitric acid or sulfuric acid treatment was...
410.

Excellent field emission properties from carbon nanotube field emitters fabricated using a filtration-taping method

Dong Hoon Shin, Seung Il Jung, Ki Nam Yun, Guohai Chen, Seok-Gy Jeon, Jung-Il Kim, Cheol Jin Lee 한국탄소학회 Carbon Letters 4 Pages

한국탄소학회 Carbon Letters 2014, Vol.15 No.3 10 214-217 (4 pages)

Dong Hoon Shin, Seung Il Jung, Ki Nam Yun, Guohai Chen, Seok-Gy Jeon, Jung-Il Kim, Cheol Jin Lee 저
...
- 1,500원
A filtration-taping method was demonstrated to fabricate carbon nanotube (CNT) emitters. This method shows many good features, including high mechanical adhesion, good electrical contact, low temperature, organic-free, low cost, large size, and suitability for various CNT materials and substrates. These good features promise an advanced field emission performance with a turn-on field of 0.88 V/mm at a current density of 0.1 mA/cm2, a threshold field of 1.98 V/mm at a current density of 1 mA/cm2,...

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