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Catalytic hydrogenation-assisted preparation of melt spinnable pitches from petroleum residue for making mesophase pitch based carbon fibers
Dong Hun Lee, Jisu Choi, Young Se Oh, Yoong Ahm Kim, Kap Seung Yang, Ho Jin Ryu, Yong Jung Kim 한국탄소학회 Carbon Letters 8 Pages
한국탄소학회 Carbon Letters 2017, Vol.24 4 28-35 (8 pages)
hy- drogenate petroleum residues [21,22]. The main function of the hydrogen is to prevent the formation of insoluble coke, thereby suppressing additional side reactions [23]. In addition, the pres- ence of hydrogen under high pressure enhances the fuidity giv- ing much larger domains of mesophase [24]. Thus, it is very important to develop an effective way of producing mesophase pitch with a... We demonstrated an effective way of preparing melt spinnable mesophase pitches via catalytic hydrogenation of petroleum residue (fluidized catalytic cracking-decant oil) and their subsequent thermal soaking. The mesophase pitches thus obtained were analyzed in terms of their viscosity, elemental composition, solubility, molecular weight, softening point and optical texture. We found that zeolite-induced catalytic hydrogenation under high hydrogen pressure contributed to a large variation in the... -
Advances in liquid crystalline nano-carbon materials: preparation of nano-carbon based lyotropic liquid crystal and their fabrication of nano-carbon fibers with liquid crystalline spinning
Yong-Mun Choi, in Jung Jun Yeon, Hwang Seung Min, Kim Hyeonsu Jeong, Bon-Cheol Ku, Munju Goh 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.4 1 223-232 (10 pages)
by the superacid method [38,40]. Fig. 4 shows the Raman spectra of SWNTs, and the ID/IG ratios of low-defect SWNTs (Fig. 4a and c) and high-defect SWNTs (Fig. 4b) are es- timated to be 0.2 and 1.0, respectively. In addition, the low-defect SWNTs spontaneously dissolved in CSA, whereas the high-defect SWNTs slightly exfoliated but did not dissolve. This indicates that the solubility of CNTs in... This review presents current progress in the preparation methods of liquid crystalline nanocarbon materials and the liquid crystalline spinning method for producing nano-carbon fibers. In particular, we focus on the fabrication of liquid crystalline carbon nanotubes by spinning from superacids, and the continuous production of macroscopic fiber from liquid crystalline graphene oxide. -
Improvement in ammonia gas sensing behavior by polypyrrole/multi-walled carbon nanotubes composites
Woo Kyung Jang, Jumi Yun, Hyung-Il Kim, Young-Seak Lee 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2012, Vol.13 No.2 3 88-93 (6 pages)
over 1 h. Three gram of pyrrole monomer was added into the MWCNTs dispersed mixture and stirred continuously for 10 min. Then 4.5 mL of H2O2 was added to the reactant solution followed by the slow addition of 0.8 g of APS, dissolved in 10 mL distilled water, to the reactant solution. The template polymerization was carried out for 4 h at 0 oC with constant stirring. The synthesized PPy/MWCNT...