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Carbon Letters, Vol. 24 - New Issue Alert
Carbon Letters, Vol. 23 - New Issue Alert
Carbon Letters, Vol. 22 - New Issue Alert
Lee, Young-Seak
(Chungnam Nat'l Univ., Korea)
Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
CURRENT ISSUE : Vol. 25, Number 1, January, 2018
Gold functionalized-graphene oxide-reinforced acrylonitrile butadiene rubber nanocomposites for piezoresistive and piezoelectric applications
Bismark Mensah, Dinesh Kumar, Gi-Bbeum Lee, Joohye Won, Kailash Chandra Gupta, Changwoon Nah
Gold functionalized graphene oxide (GOAu) nanoparticles were reinforced in acrylonitrilebutadiene rubbers (NBR) via solution and melt mixing methods. The synthesized NBR-GOAu nanocomposites have shown significant improvements in their rate of curing, mechanical strength, thermal stability and electrical properties. The homogeneous dispersion of GOAu nanoparticles in NBR has been considered responsible for the enhanced thermal conductivity, thermal stability, and mechanical properties ...
Preparation and capacitance properties of graphene based composite electrodes containing various inorganic metal oxides
Jeonghyun Kim, Sang Chul Byun, Sungwook Chung, Seok Kim
Electrochemical properties and performance of composites performed by incorporating metal oxide or metal hydroxide on carbon materials based on graphene and carbon nanotube (CNT) were analyzed. From the surface analysis by field emission scanning electron microscopy and field emission transmission electron microscopy, it was confirmed that graphene, CNT and metal materials are well dispersed in the ternary composites. In addition, structural and elemental analyses of the composite we...
Numerical study on heat transfer and densification for SiC composites during thermal gradient chemical vapour infiltration process
Zaher Ramadan, Ik-Tae Im
In this study, a thermal-gradient chemical vapor infiltration (TG-CVI) process was numerically studied in order to enhance the deposition uniformity within the preform. The computational fluid dynamics technique was used to solve the governing equations for heat transfer and gas flow during the TG-CVI process for two- and three-dimensional (2-D and 3-D) models. The temperature profiles in the 2-D and 3-D models showed good agreement with each other and with the experimental results. T...
The effect of the modification methods on the catalytic performance of activated carbon supported CuO-ZnO catalysts
Huamei Duan, Yunxia Yang, Jim Patel, Nick Burke, Yuchun Zhai, Paul A. Webley, Dengfu Chen, Mujun Long
Activated carbon (AC) was modified by ammonium persulphate or nitric acid, respectively. AC and the modified materials were used as catalyst supports. The oxygen groups were introduced in the supports during the modifications. All the supports were characterized by N2-physisorption, Raman, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and thermogravimetric analysis. Methanol synthesis catalysts were prepared through wet impregnation of copper nitrat...
Novel thermoplastic toughening agents in epoxy matrix for vacuum infusion process manufactured composites
Jin-Seok Bae, Jihye Bae, Heeju Woo, Bumjae Lee, Euigyung Jeong
This study suggests the novel thermoplastic toughening agent, which can be applied in the monomer forms without increasing the viscosity of the epoxy resin and polymerized during the resin curing. The diazide (p-BAB) and dialkyne (SPB) compounds are synthesized and mixed with the epoxy resin and the carbon fiber reinforced epoxy composites are prepared using vacuum infusion process (VIP). Then, flexural and drop weight tests are performed to evaluate the improvement in the toughness o...
Combination of ultrasonic assisted liquid phase exfoliation process and oxidation-deoxidation method to prepare largesized graphene
Lei Qi, Ruibin Guo, Zunli Mo, Qijun Wu
Large-size graphene samples are successfully prepared by combining ultrosonic assisted liquid phase exfoliation process with oxidation-deoxidation method. Different from previous works, we used an ultrasound-treated expanded graphite as the raw material and prepared the graphene via a facile oxidation-reduction reaction. Results of X-ray diffraction and Raman spectroscopy confirm the crystal structure of the as-prepared graphene. Scanning electron microscopy images show that this kin...
Theoretical study on electrical behavior of carbon chain inserted single-walled carbon nanotubes compared with Pt doped one
Hao Cui, Xiaoxing Zhang, Hanyan Xiao, Ju Tang
Carbon chain inserted carbon nanotubes (CNTs) have been experimentally proven having undergone pronounced property change in terms of electrical conductivity compared with pure CNTs. This paper simulates the geometry of carbon chain inserted CNTs and analyzes the mechanism for conductivity change after insertion of carbon chain. The geometric simulation of Pt doped CNT was also implemented for comparison with the inserted one. The results indicate that both modification by Pt atom o...
Evaluation of thymolphthalein-grafted graphene oxide as an antioxidant for polypropylene
Mona Bagheripour-Asl, Reza Jahanmardi, Hasan Tahermansouri, Erfan Forghani
In the present work, capability of thymolphthalein-grafted graphene oxide, which was successfully synthesized in this study, in stabilization of polypropylene against thermal oxidation were investigated and compared with that of SONGNOX 1010, a commercially used phenolic antioxidant for the polymer. The modified graphene oxide were incorporated into polypropylene via melt mixing. State of distribution of the nanoplatelets in the polymer matrix was examined using scanning electron micr...
Carbon molecular sieves from soybean straw-based activated carbon for CO2/CH4 separation
Yuxian Xu, Xiaochuan Chen, Dan Wu, Yongjin Luo, Xinping Liu, Qingrong Qian, Liren Xiao, Qinghua Chen
Soybean straw (SS)-based activated carbon was employed as a precursor to prepare carbon molecular sieves (CMSs) via chemical vapor deposition (CVD) technique using methane as carbon source. Prior to the CVD process, SS was activated by 0.5 wt% ZnCl2, followed by a carbonization at 500°C for 1 h in N2 atmosphere. N2 (77 K) adsorption-desorption and CO2 (273 K) adsorption tests were carried out to analyze the pore structure of the prepared CMSs. The results show that increasing the depo...
Blending effect of pyrolyzed fuel oil and coal tar in pitch production for artificial graphite
Byong Chol Bai, Jong Gu Kim, Ji Hong Kim, Chul Wee Lee, Young-Seak Lee, Ji Sun Im
Pyrolyzed fuel oil (PFO) and coal tar was blended in the feedstock to produce pitch via thermal reaction. The blended feedstock and produced pitch were characterized to investigate the effect of the blending ratio. In the feedstock analysis, coal tar exhibited a distinct distribution in its boiling point related to the number of aromatic rings and showed higher Conradson carbon residue and aromaticity values of 26.6% and 0.67%, respectively, compared with PFO. The pitch yield changed ...
Modulator of surface plasmon polariton based cycle branch graphene waveguide
Jun Zhu, Zhengjie Xu, Wenju Xu, Duqu Wei
At present, an important research area is the search for materials that are compatible with CMOS technology and achieve a satisfactory response rate and modulation efficiency. A strong local field of graphene surface plasmon polariton (SPP) can increase the interaction between light and graphene, reduce device size, and facilitate the integration of materials with CMOS. In this study, we design a new modulator of SPP-based cycle branch graphene waveguide. The structure comprises a...
Preparation of isotropic spinnable pitch and carbon fiber from biomass tar through the co-carbonization with ethylene bottom oil
Jianxiao Yang, Kui Shi, Xuanke Li, Seong-Ho Yoon
In this study, we tried to prepare an isotropic spinnable pitch which can be useful to prepare the general purpose carbon fiber through the co-carbonization of biomass tar with ethylene bottom oil under two different preparation methods (atmospheric distillation, pressurized distillation). The results showed that the ethylene bottom oil added co-carbonization was very effective to decrease of the oxygen contents for obtaining a stable spinnable pitch. The pressurized distillation was ...
Hierarchically nanoporous carbons derived from empty fruit bunches for high performance supercapacitors
Min Sung Choi, Sulki Park, Hyunjoo Lee, Ho Seok Park
Hierarchically porous, chemically activated carbon materials are readily derived from biomass using hydrothermal carbonization (HTC) and chemical activation processes. In this study, empty fruit bunches (EFB) were chosen as the carbon source due to their sustainability, high lignin-content, abundance, and low cost. The lignin content in the EFB was condensed and carbonized into a bulk non-porous solid via the HTC process, and then transformed into a hierarchical porous structure consi...
Facile preparation of electrodes derived from graphene oxide@metal organic framework hybrid materials and their electrochemical property
Jin-Young Hong, Soo-Jin Park, Seok Kim, Sungwook Chung
Since the commercialization of lithium-ion batteries (LIBs) in 1990, they evolved to improve energy density. To achieve this purpose, it is need to increase the available capacity of cathode, optimize manufacturing process of electrode material and increase the voltage limit. When estimating the performance improvement of LIB for xEV by 2020, the battery capacity will increase by more than 120 Ah, 1.4 times and the weight energy density will be doubled to 320 Wh kg-1. For these r...
Hierarchical porous carbon materials with ultrahigh specific surface area prepared from coal for supercapacitors
Peng Chang, Zhihong Qin
Supercapacitors are an excellent alternative to traditional methods of energy storage like batteries and dielectric capacitors, meanwhile coal as the most affordable and abundant energy resource currently, has also been commonly used as carbon source for electrode materials of supercapacitors. Considering the sustainable development of resource and environment protection, how to realize the utilization of coal with high ash matter cleanly and effectively, has become an important ...