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Carbon Letters, Vol. 26 - New Issue Alert
Carbon Letters, Vol. 25 - New Issue Alert
Carbon Letters, Vol. 24 - 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. 26, Number 1, April, 2018
Review of the use of activated biochar for energy and environmental applications
Hyung Won Lee1,*, Young-Min Kim2,*, Seungdo Kim2, Changkook Ryu3,Sung Hoon Park4, and Young-Kwon Park1,♠
Biochar obtained from the thermal conversion of biomass has high potential as a substitute material for activated carbon and other carbon-based materials because it is economical, environmentally friendly, and carbon-neutral. The physicochemical properties of biochar can also be controlled by a range of activation methods such as physical, chemical, and hydrothermal treatments. Activated biochar can be used as a catalyst for the catalytic pyrolysis of a biomass and as an absorbent for...
X-ray diffraction analysis of the effect of ball milling time on crystallinity of milled polyacrylonitrile-based carbon fiber
Sang-Hye Lee, Dong-Su Kang, Sang-Min Lee, and Jae-Seung Roh
Milled carbon fiber (mCF) was prepared by a ball milling process, and X-ray diffraction (XRD) diffractograms were obtained by a 2θ continuous scanning analysis to study mCF crystallinity as a function of milling time. The raw material for the mCF was polyacrylonitrile-based carbon fiber (T700). As the milling time increased, the mean particle size of the mCF consistently decreased, reaching 1.826 μm at a milling time of 18 h. The XRD analysis showed that, as the milling time increased...
Performance of carbon fiber added to anodes of conductive cement-graphite pastes used in electrochemical chloride extraction in concretes
M. J. Pellegrini-Cervantes1,♠, C. P. Barrios-Durstewitz1, R. E. Núñez-Jaquez1, F. J. Baldenebro-Lopez1, R. Corral-Higuera1, S. P. Arredondo-Rea1, M. Rodriguez-Rodriguez1, O. Llanes-Cardenas2, and R. Beltran-Chacon3
Pollution of chloride ion-reinforced concrete can trigger active corrosion processes that reduce the useful life of structures. Multifunctional materials used as a counter-electrode by electrochemical techniques have been used to rehabilitate contaminated concrete. Cement-based pastes added to carbonaceous material, fibers or dust, have been used as an anode in the non-destructive Electrochemical Chloride Extraction (ECE) technique. We studied the performance of the addition of Carbon...
Dispersion stability of polyelectrolyte-wrapped carbon black particles in a highly fluorinated solvent
Hyeon Ji Yoon, Jun Ho Choe, and Hyoung-Joon Jin
The dielectric medium used in electrophoretic displays (EPDs) is required to be an environmentally friendly solvent with high density, low viscosity, and a large electric constant. Hydrofluoroether, a highly fluorinated solvent with eco-friendly characteristics, is regarded as a viable alternative medium for EPDs, owing to the similarity of its physical properties to those of the conventional EPD medium. Surface modification of particles is required, however, in order for it to d...
One-step microwave synthesis of magnetic biochars with sorption properties
Anton Zubrik1,♠ , Marek Matik1, Michal Lovás1, Katarína Štefušová1, Zuzana Danková1, Slavomír Hredzák1, Miroslava Václavíková1, František Bendek1, Jaroslav Briančin1, Libor Machala2, and Jiři Pechoušek2
Adsorption is one of the best methods for wastewater purification. The fact that water quality is continuously decreasing requires the development of novel, effective and cost available adsorbents. Herein, a simple procedure for the preparation of a magnetic adsorbent from agricultural waste biomass and ferrofluid has been introduced. Specifically, ferrofluid mixed with wheat straw was directly pyrolyzed either by microwave irradiation (900 W, 30 min) or by conventional heating (...
Determination of nickel and cadmium in fish, canned tuna, black tea, and human urine samples after extraction by a novel quinoline thioacetamide functionalized magnetite /graphene oxide nanocomposite
Leila Naghibzadeh and Mahboobeh Manoochehri,♠
In this research, a novel and efficient quinoline thioacetamide functionalized magnetic graphene oxide composite (GO@Fe3O4@QTA) was synthesized and utilized for dispersive magnetic solid phase preconcentration of Cd(II) and Ni(II) ions in urine and various food samples. A number of diverse methods were employed for characterization of the new nanosorbent. The design of experiments approach and response surface methodology were applied to monitor and find the...
Surface modified rice husk ceramic particles as a functional additive: Improving the tribological behaviour of aluminium matrix composites
Lehua Cheng1, Dongrui Yu2, Enzhu Hu3,♠, Yuchao Tang3, Kunhong Hu3, Karl David Dearn4,♠, Xianguo Hu2, and Min Wang1
An electroless deposition method was used to modify the surface properties of rice husk ceramic particles (RHC) by depositing nano-nickel on the surface of the RHC (Ni-RHC). The dry tribological performances of aluminum matrix composite adobes containing different contents of RHC and Ni-RHC particles have been investigated using a micro-tribometer. Results showed that the Ni-RHC particles substantially improved both the friction and wear properties of the Ni-RHC/aluminum matrix a...
Geometric structure and electronic behavior of Rh decorating effect on zigzag CNTs (n=7-12): A DFT study
Hao Cui1, Xiaoxing Zhang1,2,♠, Yongjian Zhou1, and Jun Zhang1
Comprehensive calculations of the Rh decoration effect on zigzag CNTs with n ranging from 7 to 12 were conducted in this work to understand the effect of Rh doping on geometric structures and electronic behaviors upon metallic and semiconducting CNTs. The obtained results indicated that Rh dopant not only contributes to the deformation of C-C bonds on the sidewall of CNTs, but also transforms the electron distribution of related complexes, thereby leading to a remarkable increase...
Effect of bio-char application combined with straw residue mulching on soil soluble nutrient loss in sloping arable land
Chiming Gu1,2, Fang Chen2,3,♠, Ibrahim Mohamed2,5, Margot Brooks4, and Zhiguo Li2,♠
We assessed the effects of combining bio-char with straw residue mulching on the loss of soil soluble nutrients and citrus yield in sloping land. The two-year study showed that straw residue mulching (ST) and bio-char application combined with straw residue (ST+BC) can significantly reduce soil soluble nutrient loss when compared with the control treatment (CK). The comparative volume of the soil surface runoff after each of the treatments was as follows: CK > ST > ST + BC. Compared w...
Carbon dioxide (CO2) concentrations and activated carbon fiber filters in passenger vehicles in urban areas of Jeonju, Korea
Hong Gun Kim1, Yunhua Yu2, Xiaoping Yang2, and Seung Kon Ryu1,♠
The South Korean Ministry of the Environment has revised the laws relating to the management of interior air quality for multiple use facilities, and recommends maintaining carbon dioxide (CO2) concentration in passenger vehicles below 1000 ppm during operation in urban areas of large cities. However, the interior CO2 concentration of passenger vehicles can rapidly increase and exceed 5000 ppm within 30 min, as observed when two passengers are traveling in urban ...
Comparative study on the morphological properties of graphene nanoplatelets prepared by an oxidative and non-oxidative route
Jung-Chul An1, Eun Jung Lee1, So-Young Yoon1, Seong-Young Lee2 and Yong-Jung Kim1,♠
Morphological differences in multi-layered graphene flakes or graphene nanoplatelets pre¬pared by oxidative (rGO-NP, reduced graphene oxide-nanoplatelets) and non-oxidative (GIC-NP, graphite intercalation compound-nanoplatelets) routes were investigated with var¬ious analytical methods. Both types of NPs have similar specific surface areas but very dif¬ferent structural differences. Therefore, this study proposes an effective and simple method to identify structural differences in gra...
Electrochemical oxidation-reduction and determination of urea at enzyme free PPY-GO electrode
Harish Mudila1,2, Parteek Prasher3, Sweta Rana2, Beena Khati4, and M.G.H. Zaidi2,♠
This manuscript explains the effective determination of urea by redox cyclic voltammet¬ric analysis, for which a modified polypyrrole-graphene oxide (PPY-GO, GO 20% w/w of PPY) nanocomposite electrode was developed. Cyclic voltammetry measurements revealed an effective electron transfer in 0.1 M KOH electrolytic solution in the potential window range of 0 to 0.6 V. This PPY-GO modified electrode exhibited a moderate electrocatalytic effect towards urea oxidation, thereby allowing its ...
The effect of carbon nanotube diameter on the electrical, thermal, and mechanical properties of polymer composites
Kyung Jae Kim1,2, Mong-Young Huh1, Won-Seok Kim1, Joon-Hyuk Song1, Hak Sung Lee1, Ji-Yeon Kim3, So-Ra Lee2, Won Seok Seo4, Sung-Mo Yang5, and Young Soo Park1,♠
Fabrication of electrochemical double-layer capacitor electrode using an activated carbon fiber network
Wan Jin Kim1, Jun Young Yoon2, Tae Hoon Ko1, Byoung-Suhk Kim1,3,♠, and Yong Sik Chung1,♠
The synergetic effect of phenolic anchoring and multi-walled carbon nanotubes on the yarn pull-out force of para-aramid fabrics at high speed
Jinsil Cheon1, Byung Il Yoon2, and Donghwan Cho1,♠
Preparation of fluorinated graphite with high fluorinecontent and high crystallinity
Min-Jung Jung, Hye-Ryeon Yu, and Young-Seak Lee