The effects of graphene content on the corrosion resistance, and electrical, thermal and mechanical properties of graphene/copper composites
Publication date: April 2019Source: New Carbon Materials, Volume 34, Issue 2Author(s): Jian Wang, Li-na Guo, Wan-ming Lin, Jin Chen, Shuai Zhang, Shao-da Chen, Tian-tian Zhen, Yu-yang ZhangAbstractGraphene reinforced copper matrix (G/Cu) composites were prepared by temperature-programmed sintering of their mixtures in molds under pressure. The effects of graphene content on the microstructure, and electrical, thermal, mechanical and corrosion properties of the G/Cu composites were investigated. Results show that the hardness, tensile strength, yield strength, thermal and electrical conductivities, and corrosion resistance ...
Source: New Carbon Materials - July 12, 2019 Category: Chemistry Source Type: research
Fabrication, microstructures and properties of SiCf/SiC composites prepared with two kinds of SiC fibers as reinforcements
Publication date: April 2019Source: New Carbon Materials, Volume 34, Issue 2Author(s): Hong-lei Wang, Xin-gui Zhou, Shu-ming Peng, Hai-bin Zhang, Xiao-song ZhouAbstractThree-dimensional (3D) SiC/SiCf composites were fabricated by a polymer impregnation and pyrolysis (PIP) method using 3D four directional braided preforms from two kinds of SiC fibers as the reinforcements and liquid polycarbosilane as the SiC precursor. Both kinds of SiC fibers were prepared from the same precursor and process but with different heat treatment temperatures. The one prepared at a higher temperature (No.1) had a higher crystallinity than the ...
Source: New Carbon Materials - July 12, 2019 Category: Chemistry Source Type: research
Phase change materials coated with modified graphene-oxide as fillers for silicone rubber used in thermal interface applications
Publication date: April 2019Source: New Carbon Materials, Volume 34, Issue 2Author(s): Jing Feng, Zhan-jun Liu, Dong-qing Zhang, Zhao He, Ze-chao Tao, Quan-gui GuoAbstractGraphene oxide prepared by the Hummers method was chemically modified by 3-aminopropyltriethoxysilane and spherical paraffin@modified graphene-oxide particles (P@m-GO) with a core-shell structure were obtained by an emulsion method. P@m-GO filler/silicone rubber (SIR) matrix composites (P@m-GO/SIR) were prepared by dispersing different amounts of P@m-GO in the SIR precursors, followed by curing and used as thermal interface materials (TIMs). Results indic...
Source: New Carbon Materials - July 12, 2019 Category: Chemistry Source Type: research
Beneficiation of ultra-large flake graphite and the preparation of flexible graphite sheets from it
Publication date: April 2019Source: New Carbon Materials, Volume 34, Issue 2Author(s): Ji-hui Li, Shi-yu Hou, Jia-rui Su, Kuan Li, Lu-bin Wei, Li-qiang Ma, Wan-ci Shen, Fei-yu Kang, Zheng-hong HuangAbstractA graphite ore with ultra-large flakes (ULFG) found in China (Wulate County, Inner Mongolia Autonomous Region, China), was first jaw-crushed and pneumatically separated to remove rocks, before being subjected to two froth-flotations and finally leached with NaOH and HCl to a purity of 99.9%. The purified ULFG was used to prepare exfoliated graphite by a combined chemical intercalation and rapid heating method and the lat...
Source: New Carbon Materials - July 12, 2019 Category: Chemistry Source Type: research
Hierarchically-organized C60 crystals obtained from a liquid/liquid interfacial precipitation method by using 1,2,3,4-tetrahydronaphthalene as a solvent
Publication date: June 2019Source: New Carbon Materials, Volume 34, Issue 3Author(s): Lin-wen Zhang, Sheng-ju Zhou, Meng-jun Chen, Ke-yang Yin, Hong-guang LiAbstractC60 crystals have potential applications in the optoelectronics, photoconducting devices and templated synthesis fields. However, their preparation is complex. A simple liquid-liquid interfacial precipitation method was used to fabricate hierarchically-organized C60 crystals with various topographic characteristics, using 1,2,3,4-tetrahydronaphthalene as a good solvent, and isopropanol, ethanol or methanol as a poor solvent. Results indicate that the morphology...
Source: New Carbon Materials - July 9, 2019 Category: Chemistry Source Type: research
Activated carbons prepared by the KOH activation of a hydrochar from garlic peel and their CO2 adsorption performance
Publication date: June 2019Source: New Carbon Materials, Volume 34, Issue 3Author(s): Ge-ge Huang, Yi-fei Liu, Xing-xing Wu, Jin-jun CaiAbstractBiomass is regarded as a promising low-cost precursor for the preparation of activated carbons. However, direct carbonization of biomass usually produces a low-surface-area or even non-porous carbons that are useless for CO2 capture. In this work, garlic peel was first transformed to a hydrochar by hydrothermal carbonization and then chemically activated by KOH to obtain activated carbons with high-surface-areas and large pore volumes. The microstructure and morphology of the activ...
Source: New Carbon Materials - July 9, 2019 Category: Chemistry Source Type: research
Co-carbonization of brominated petroleum pitch, coal tar pitch and benzoyl chloride to prepare cokes
Publication date: June 2019Source: New Carbon Materials, Volume 34, Issue 3Author(s): Ya-wei Dong, Guo-zheng Xing, Li-e Jin, Ping Li, Qing CaoAbstractAfter the quinoline insoluble fraction was removed, petroleum pitch (PP) was brominated under ultraviolet light irradiation for 3 to 9 h with a bromine to PP mass ratio of 1:20 to prepare brominated PPs (BPPs). Synthetic pitches (SPs) were produced from these BPPs by mixing them with refined coal tar pitch (RCTP) using a solvent (5 wt% benzoyl chloride)-assisted mixing method, using different mass ratios of BPP/RCTP, and BPPs with different irradiation times. The SPs were car...
Source: New Carbon Materials - July 9, 2019 Category: Chemistry Source Type: research
Effect of the graphene content on the microstructures and properties of graphene/aluminum composites
Publication date: June 2019Source: New Carbon Materials, Volume 34, Issue 3Author(s): Jian Wang, Li-na Guo, Wan-ming Lin, Jin Chen, Chun-lian Liu, Shao-da Chen, Shuai Zhang, Tian-tian ZhenAbstractA graphite mold was filled with a mixed powder of aluminum and graphene. It was evacuated to 2×10−1 Pa, pre-pressed under 10 MPa, heated to 450 °C where it was kept for 5 min, pressed again under 40 MPa, heated to 600 °C where it was kept for another 5 min to prepare graphene/aluminum (G/Al) composites. The effect of the graphene content on the microstructure, and thermal, electrical, mechanical and anticorrosive properties o...
Source: New Carbon Materials - July 9, 2019 Category: Chemistry Source Type: research
Effect of gelation time on the microstructures, mechanical properties and cyclization reactions of dry-jet gel-spun polyacrylonitrile fibers
Publication date: February 2019Source: New Carbon Materials, Volume 34, Issue 1Author(s): Xiao-peng Li, Xi-dong Suo, Yao-dong Liu, Yong-hong LiAbstractThe use of gel spinning technology in the formation of polyacrylonitrile (PAN)-based carbon fibers has led to significant tensile property improvements. PAN, dimethylsulfoxide (DMSO) and dimethylformamide (DMF) solutions were dry-jet spun, gelled in methanol at −20 and −50 °C for different times from 0 to 40 d, and vacuum-dried at 0 °C for 24 h to obtain PAN fibers that were drawn to a drawing ratio (DR) of 4 in a hot glycerin bath at 110 °C, and then to various DRs i...
Source: New Carbon Materials - March 14, 2019 Category: Chemistry Source Type: research
The evolution of microstructure and thermal conductivity of mesophase pitch-based carbon fibers with heat treatment temperature
Publication date: February 2019Source: New Carbon Materials, Volume 34, Issue 1Author(s): Zhen Fan, Min Cao, Wen-bing Yang, Shi-peng Zhu, Zhi-hai FengAbstractThe evolution of microstructure and morphology of mesophase pitch-based carbon fibers (MPCFs) with heat treatment temperature (HTT) was investigated by SEM, TEM, Raman spectroscopy and XRD. The thermal conductivity of the MPCFs was examined by a modified 3 ω method. Results indicate that the degree of graphitization and the thermal conductivity of the MPCFs increase with HTT. The thermal conductivity of the MPCFs reaches 518 W/m·K at a HTT of 3000 °C. The thermal c...
Source: New Carbon Materials - March 14, 2019 Category: Chemistry Source Type: research
Effect of the oxygen content and the functionality of spinnable pitches derived from ethylene tar by distillation on the mechanical properties of carbon fibers
Publication date: February 2019Source: New Carbon Materials, Volume 34, Issue 1Author(s): Kui Shi, Xia-xiang Zhang, Wei Wu, Jian-xiao Yang, Hong-bo Liu, Xuan-ke LiAbstractThree basic pitches were prepared by the distillation of ethylene tar at 200, 250, or 300 °C for 3 h. Spinnable pitches were produced from them using air-blowing followed by heat treatment at 330°C for 4 h and are designated P200AT, P250AT and P300AT, respectively. These three pitches, and stabilized fibers and carbon fibers produced from them were characterized by TG-MS, FT-IR, 13C-NMR, XRD, SEM, solubility tests and elemental analysis. The components ...
Source: New Carbon Materials - March 14, 2019 Category: Chemistry Source Type: research
Temperature-variable Raman scattering study on micromechanical properties of the carbon fiber reinforced polyimide composite film
Publication date: February 2019Source: New Carbon Materials, Volume 34, Issue 1Author(s): Min Ran, Li-shuang Jia, Chao-ge Cheng, Qi-lin WuAbstractTemperature-variable Raman spectroscopy equipped with a mapping function was used to investigate the micro-mechanical properties of a carbon fiber (CF)-reinforced polyimide (PI) composite film using carbon nanotubes (3 wt%) dispersed in PI as the stress sensor. The stress distributions in the CFs and the interface region during heating from 25 to 300 °C were mapped based on the stress sensitive Raman G' band (around 2679 cm−1) shifts of the CNTs. Results indicated that thermal...
Source: New Carbon Materials - March 14, 2019 Category: Chemistry Source Type: research
The thermal and mechanical properties of carbon fiber/flake graphite/cyanate ester composites
Publication date: February 2019Source: New Carbon Materials, Volume 34, Issue 1Author(s): Pei-luo Shi, Yue-you Wang, Hong-jun Guo, Hong-jie Sun, Yun-feng ZhaoAbstractPrepregs of carbon fiber reinforced cyanate ester (CE) resin matrix composites (CF/CE and CF/(10 wt% FG-CE)) were prepared with a laminate thickness of 2.0 mm and a fiber volume fraction of 60% with and without 10 wt% flake graphite (FG) as the CE filler. The rheological and thermal properties of the CE and FG/CE matrix as well as the thermal conductivity and mechanical properties of the CF/CE and CF/(10 wt% FG-CE) composites were investigated. Results indicat...
Source: New Carbon Materials - March 14, 2019 Category: Chemistry Source Type: research
Graphene-based in-plane heterostructures for atomically thin electronics
Publication date: December 2018Source: New Carbon Materials, Volume 33, Issue 6Author(s): Jun-jiang Liu, Rui-jie Li, Hang Li, Yi-fei Li, Jun-he Yi, Hai-cheng Wang, Xiao-chong Zhao, Pei-zhi Liu, Jun-jie Guo, Lei LiuAbstractTwo-dimensional materials are promising for use in atomically thin electronics, optoelectronics and flexible electronics because of their versatile band structures, optical transparency, easy transfer to a substrate and compatibility with current technology for integrated circuits. Three key components of contemporary integrated circuits, metals, insulators and semiconductors, have analogues in two-dimens...
Source: New Carbon Materials - January 18, 2019 Category: Chemistry Source Type: research
A first-principles study of lithium and sodium storage in two-dimensional graphitic carbon nitride
Publication date: December 2018Source: New Carbon Materials, Volume 33, Issue 6Author(s): Meng-yao Wang, Jia LiAbstractTwo-dimensional carbon nitride is considered a very good battery electrode material owing to its uniform-size pores and the presence of nitrogen atoms. First-principles calculations were used to investigate the adsorption and storage of lithium and sodium on monolayer g-C2N. The capacities of lithium and sodium ion batteries for monolayer g-C2N are 596 (LiC2N) and 276 (NaC4N2) mAh/g, respectively. The average Li binding energy reaches 2.39 eV relative to isolated Li atoms, which suggests that the lithium c...
Source: New Carbon Materials - January 18, 2019 Category: Chemistry Source Type: research
