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Carbon Letters, Vol. 28 - New Issue Alert
Carbon Letters, Vol. 27 - New Issue Alert
Carbon Letters, Vol. 26 - 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. 28, Number 1, October, 2018
A brief review on graphene applications in rechargeable lithium ion battery electrode materials
Sameen Akbar, Muhammad Rehan, Liu Haiyang, Iqra Rafique, and Hurria Akbar
Graphene is a single atomic layer of carbon atoms, and has exceptional electrical, mechanical, and optical characteristics. It has been broadly utilized in the fields of material science, physics, chemistry, device fabrication, information, and biology. In this review paper, we briefly investigate the ideas, structure, characteristics, and fabrication techniques for graphene applications in lithium ion batteries (LIBs). In LIBs, a constant three-dimensional (3D) conductive system can ...
Lifetime prediction for interfacial adhesion of Carbon/Cork composites with an accelerated aging test
Hyung Sik Lee1, Sang Ki Chung1, Hyung Gean Kim1, Byeong Yeol Park1, Jong Sung Won2, and Seung Goo Lee2,♠
In the aerospace field, Carbon/Cork composites have been used for rocket propulsion systems as a light weight structural component with a high bending stiffness and high thermal insulation properties. For the fabrication of a carbon composite with a heat insulation cork part, the bonding properties between them are very important to determine the service life of the Carbon/Cork composite structure. In this study, the changes in the interfacial adhesion and mechanical properties of Car...
A novel preparation and formation mechanism of carbon nanotubes aerogel
Li Shaolong*, He Yan*,♠, Jing Chengwei, Gong Xiubin, Cui Lianlei, Cheng Zhongyue, Zhang Chuanqi, and Nan Fei
A novel, unique, and effective method for carbon nanotube (CNT) dispersion by the free arc stimulation is proposed. CNTs are introduced as an aerogel into the air space via the dispersion method and can be utilized as a solution by adding it to solvents. The volume of the original generated CNT aerogel with a high-volume expansion ratio displays a performance two orders of magnitudes better than that of raw CNTs, which is considered a powerful characterization of the dispersion effect...
Influence of kneading ratio on the binding interaction of coke aggregates on manufacturing a carbon block
Jong Gu Kim1,2, Ji Hong Kim1,4, Byong Chol Bai1, Yun Jeong Choi1, Ji Sun Im1,6,♠, Tae-Sung Bae3, and Young-Seak Lee2,♠
Coke aggregates and carbon artifacts were produced to investigate the interactions of coke and pitch during the kneading process. In addition, the kneading ratio of the coke and binder pitch for the coke aggregates was controlled to identify the formation of voids and pores during carbonization at 900°C. Experiments and thermogravimetric analysis revealed that carbon yields were improved over the theoretical yield calculated by the weight loss of the coke and binder pitch; the improve...
Simple one-step synthesis of carbon nanoparticles from aliphatic alcohols and n-hexane by stable solution plasma process
Choon-Sang Park1,*, Dae Sub Kum1,*, Jong Cheol Kim2, Jun-Goo Shin1, Hyun-Jin Kim3, Eun Young Jung1, Dong Ha Kim1, Daseulbi Kim1, Gyu Tae Bae1, Jae Young Kim4, Bhum Jae Shin5, and Heung-Sik Tae1,♠
This paper examines a simple one-step and catalyst-free method for synthesizing carbon nanoparticles from aliphatic alcohols and n-hexane with linear molecule formations by using a stable solution plasma process with a bipolar pulse and an external resistor. When the external resistor is adopted, it is observed that the current spikes are dramatically decreased, which induced production of a more stable discharge. Six aliphatic linear alcohols (methanol-hexanol) containing carbon with...
Pyrolysis kinetics and microstructure of thermal conversion products on toluene soluble component from two kinds of modified pitch
Yaming Zhu, Xuefei Zhao, Lijuan Gao, and Junxia Cheng
Modified pitch A (MPA) and modified pitch B (MPB) were prepared by oxidative polymerization and thermal polycondensation reaction with refined pitch as the raw material, respectively. The toluene soluble components (TS-1 and TS-2) were obtained by solvent extraction from MPA and MPB, separately. The Flynn-Wall-Ozawa method and Kissinger-AkahiraSunose method were used to calculate the pyrolysis activation energy of TS. The SatavaSestak method was used to investigate the pyrolysis kinet...
Hierarchically porous carbon aerogels with high specific surface area prepared from ionic liquids via salt templating method
Zhen Zhang, Junzong Feng, Yonggang Jiang, and Jian Feng
High surface carbon aerogels with hierarchical and tunable pore structure were prepared using ionic liquid as carbon precursor via a simple salt templating method. The as-prepared carbon aerogels were characterized by nitrogen sorption measurement and scanning electron microscopy. Through instant visual observation experiments, it was found that salt eutectics not only serve as solvents, porogens, and templates, but also play an important role of foaming agents in the preparation of c...
Rh-doped carbon nanotubes as a superior media for the adsorption of O2 and O3 molecules: a density functional theory study
Hao Cui1, Xiaoxing Zhang1,2,♠, Qiang Yao3, Yulong Miao3, and Ju Tang2
Transition-metal-embedded carbon nanotubes (CNTs) have been accepted as a novel type of sensing material due to the combined advantage of the transition metal, which possesses good catalytic behavior for gas interaction, and CNTs, with large effective surface areas that present good adsorption ability towards gas molecules. In this work, we simulate the adsorption of O2 and O3 onto Rh-doped CNT in an effort to understand the adsorbing behavior of such a surface. ...
Electronic transport properties of linear carbon chains encapsulated inside single-walled carbon nanotubes
Tomohiro Tojo1,♠, Cheon Soo Kang2, Takuya Hayashi2, and Yoong Ahm Kim3,4,♠
Linear carbon chains (LCCs) encapsulated inside the hollow cores of carbon nanotubes (CNTs) have been experimentally synthesized and structurally characterized by Raman spectroscopy and transmission electron microscopy. However, in terms of electronic conductivity, their transportation mechanism has not been investigated theoretically or experimentally. In this study, the density of states and quantum conductance spectra were simulated through density functional theory combined with t...
Improved flame retardant performance of cellulose fibers following fluorine gas treatment
Jong Gu Kim1, Young-Seak Lee1,♠, and Se Jin In2,♠
To improve the flame retardant performance of cellulose fibers, fluorine functional groups were introduced under various controlled fluorination conditions. The properties of the fluorinated cellulose fibers were analyzed by X-ray photoelectron spectroscopy and a thermogravimetric analysis. The fluorine functional group content in the fluorinated cellulose fibers increased with an increase in the fluorination temperature. However, the fluorination reaction increased the char yield and...
Empirical relationship between band gap and synthesis parameters of chemical vapor deposition-synthesized multiwalled carbon nanotubes
Oyema E. Obasogie1, Ambali S. Abdulkareem1,2, Is’haq A. Mohammed1,2,♠, Mercy T. Bankole2,3, Jimoh. O. Tijani2,3, and Oladiran K. Abubakre2,4
In this study, an empirical relationship between the energy band gap of multi-walled carbon nanotubes (MWCNTs) and synthesis parameters in a chemical vapor deposition (CVD) reactor using factorial design of experiment was established. A bimetallic (Fe-Ni) catalyst supported on CaCO3 was synthesized via wet impregnation technique and used for MWCNT growth. The effects of synthesis parameters such as temperature, time, acetylene flow rate, and argon carrier gas flow rate on the MWCNTs e...
Adsorptive removal of odour substances and NO and catalytic esterification using empty fruit bunch derived biochar
Hyung Won Lee1,*, Jae-Kon Kim2,*, and Young-Kwon Park1,♠
Empty fruit bunch (EFB) char was used to remove NOx and odorous substances. The physicochemical properties of the EFB chars were altered by steam or KOH treatments. The Brunauer-Emmett-Teller surface area and porosity were measured to determine the properties of the modified EFB chars. The deNOx and adsorption test for hydrogen sulphide and acetaldehyde were performed to determine the feasibility of the modified EFB chars. The KOH-treated EFB (KEFB) char revealed higher deN...
Equilibrium and kinetic studies of an electro-assisted lithium recovery system using lithium manganese oxide adsorbent material
Dong-Hee Lee1,*, Taegong Ryu2,*, Junho Shin3, and Young Ho Kim1,♠
This study examined the influence of operating parameters on the electrosorptive recovery system of lithium ions from aqueous solutions using a spinel-type lithium manganese oxide adsorbent electrode and investigated the electrosorption kinetics and isotherms. The results revealed that the electrosorption data of lithium ions from the lithium containing aqueous solution were well-fitted to the Langmuir isotherm at electrical potentials lower than -0.4 V and to the Freundlich isotherm ...
Improved heat-spreading properties of fluorinated graphite/ epoxy film
Kyung Hoon Kim, Jeong-In Han, Da-Hee Kang, and Young-Seak Lee
Effects of surface etching on microstructure and mechanical strength of carbon fibers
Kwan-Woo Kim1,2, Jin-Soo Jeong2,3, Dong Chul Chung1, Kay-Hyeok An3, ♠, and Byung-Joo Kim1,3,♠
Catalytic effects of heteroatom-rich carbon-based freestanding paper with high active-surface area for vanadium redox flow batteries
Min Eui Lee, Hyo Won Kwak, and Hyoung-Joon Jin
Synthesis of Polypyrrole-based Nitrogen-containing Porous Carbon Nanotubes for CO2 Adsorption
Jiamin Liu1,#, Biao Jin2,#, Long-Yue Meng1,♠, and Kyung-Hee Lee3,♠
Effect of the SBA-15 template and KOH activation method on CO2 adsorption by N-doped polypyrrole-based porous carbons
Hui Yuan1,#, Biao Jin2,#, and Long-Yue Meng1,♠