Synthesis of S, N co-doped porous carbons from polybenzoxazine for CO2 capture
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Zu-er JIN, Jian-long WANG, Ri-jie ZHAO, Tao-tao GUAN, Dong-dong ZHANG, Kai-xi LIAbstractS, N co-doped porous carbons were synthesized from polybenzoxazine through solidification, carbonization and KOH activation using 4-cyanophenol, thiourea and formaldehyde as the monomers and a triblock copolymer (Pluronic F127) as a soft template. The samples were characterized by FT-IR, SEM, N2 adsorption, elemental analysis and XPS. Results indicate that the activated samples had high surface areas of 1 511. 6-2 385. 1 m2 g−1 with a large number...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
A two-step method for the preparation of high performance corncob-based activated carbons as supercapacitor electrodes using ammonium chloride as a pore forming additive
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Qing-ling WEI, Zhi-min CHEN, Xiao-feng WANG, Xiao-min YANG, Zi-chen WANGAbstractActivated carbons were prepared from corncobs by an initial hydrothermal treatment using ammonium chloride as a pore forming additive and then by KOH activation. Samples were characterized by SEM, XRD, TG analysis and nitrogen adsorption. The effects of preparation conditions on the iodine number, yield and their electrochemical performance as supercapacitor electrodes were investigated. Results indicate that NH4 Cl is helpful for the formation of activated...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Effects of the ultrasound-assisted H3 PO4 impregnation of sawdust on the properties of activated carbons produced from it
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Zong-bo ZHANG, Xiao-yang LIU, Da-wei LI, Tian-tian GAO, Yu-qi LEI, Bao-gui WU, Jia-wei ZHAO, Yan-kui WANG, Ling WEIAbstractThe effects of the ultrasound-assisted H3 PO4 impregnation of sawdust on the pore structure, morphology, surface functional groups, and adsorption capacities for iodine and methylene blue of activated carbons produced from it were investigated. Results showed that ultrasonic impregnation promoted the mass transfer and uptake of H3 PO4, which simultaneously increased specific surface area, pore volumes of micropores...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Preparation of Ni-rice husk carbon catalysts for the hydrodeoxygenation of vanillin
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Zhi-hao CHEN, Wei CHAO, Yi FENG, Lu JIN, Yan-chao ZHU, Xiao-min YANG, Zi-chen WANGAbstractNi-rice husk carbon catalysts with Ni loadings from 2 to 8 wt% were prepared by impregnating rice husk activated carbon with Ni(NO3) 2·6H2O solutions, followed by carbothermal reduction at temperatures from 500 to 950 °C. The valance, particle size and dispersion of nickel nanoparticles on the carbon, the graphitization extent of the carbon, and the pore structure of the catalysts were investigated by XRD, TEM, Raman spectroscopy and nitrogen ad...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Preparation and process optimization of randomly oriented C/C composites by a novel method
The objective of this research was to devise a method by which complete wetting of fibers in the tow with mesophase pitch is attained by mixing stabilized pitch and chopped and scattered carbon fibers, followed by hot-pressing and carbonization. The influence of process parameters on the carbon yield of the stabilized mesophase pitch is evaluated. The carbon yield divided by processing time and the carbon yield multiplied by the ratio of the apparent density to real density of the C/C composites are used to optimize process parameters. Results show that complete wetting of fibers with mesophase pitch is attained by this me...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Ablation and oxidation resistance properties of C/C composites densified by xylene pyrocarbon using LaCl3 as a catalyst and resin carbon
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Hai-liang DENG, Jin-huang ZHENG, Jun-ning CAO, Dong-mei YAO, Hong CUI, Xiao-hu ZHANG, Hong SUAbstractCarbon/carbon composites with densities of 1.72-1.73 g/cm3 were prepared by densification with pyrocarbon produced from xylene using a LaCl3-catalyzed film boiling chemical vapor infiltration method, followed by resin impregnation, carbonization and graphitization. The ablation and oxidation resistance of the composites were respectively tested by an oxyacetylene torch and air oxidation methods. The phase composition and morphology of t...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Effect of nozzle thermal environment on the ablation rate of the throat inserts of solid rocket motors
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Jun-ming SU, Shao-jian ZHOU, Ning-juan XUE, Chun XIAO, Jian-tao SUN, Rui-zhen LI, Hong CUIAbstractSolid rocket motors using five different C/C composites (radially woven 4D C/C, axially woven 4D C/C, integral felt C/C, needle felt C/C and punctured 3D C/C) and two kinds of graphite (T705 graphite and an anisotropic pyrolytic graphite with a density of 2.18 g/cm3, a porosity of 1% and graphene layers perpendicular to throat surface) as the throat inserts were propelled by hydroxyl terminated polybutadiene or a high energy fuel to test t...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Analysis of the interaction energies between and within graphite particles during mechanical exfoliation
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Li YIN, Chuan DENG, Fei DENG, Xiao-ling GEAbstractA method for calculating the interaction energies between and within graphite particles is established by analyzing their thickness and lateral size distribution from AFM and SEM images of 300 particles during mechanical exfoliation at different times. The energy for exfoliating graphite sheets by breaking van der Waals (vdW) bonds, the energy for fracturing graphite sheets by breaking covalent bonds, the potential energies for restacking graphite sheets and the lateral aggregation of g...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Preparation and biological properties of a graphene oxide/silk fibroin barrier membrane loaded with simvastatin
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Bin ZHAO, Feng WU, Ying-ying BAI, Min FANG, Lu WANGAbstractA graphene oxide/silk fibroin (GO/SF) barrier membrane loaded with simvastatin (SIM) was prepared by a freezedrying method. The biocompatibility of the barrier membrane in vitro and its applicability in guided bone regeneration were investigated. The morphology, structure and the drug release behavior of the membrane were characterized by SEM, XRD and UV-spectroscopy. Laser confocal microscopy and CCK-8 tests were used to evaluate the attachment and proliferation of MC3T3-E1 de...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
A Boltzmann model for calculating the microscopic ablation morphology of C/C composites
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Jing-chao YUAN, Zi-di ZHU, Fang-zhou ZHANG, Dan ZHANG, Wei-gang ZHANG, Ai-jun LIAbstractA two-solid-phase cell ablation model involving an oxidative gas phase, a carbon fiber and a carbon matrix is proposed and the Boltzmann equation of non-equilibrium statistical physics was numerically solved to simulate the spatial evolution of each phase at the mesoscopic scale during the diffusion-surface reaction process. The predicted results of the model are in a good agreement with those of the analytical solution. A more complex three-solid-p...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
A diode based on a chemically-doped SWCNT
Publication date: October 2018Source: New Carbon Materials, Volume 33, Issue 5Author(s): Chuan-juan SONG, Jun-ru YANG, Cheng-hao LIAO, Xiao-dong LIU, Ying WANG, Rong HE, Xu-sheng DONG, Han-qing ZHONG, Yi-jian LIU, Li-ying ZHANG, Chang-xin CHENAbstractCarbon nanotube p-n junction diodes are expected to be the building block of next generation integrated circuits. A p-i-n junction diode was prepared from a SWCNT with one end p-type doped, the other end n-type doped and the middle segment undoped. The p-type doping was performed using triethyloxonium hexachloroantimonate to form an air stable charge transfer complex (SWCNT+-S...
Source: New Carbon Materials - October 30, 2018 Category: Chemistry Source Type: research
Fabrication of magnetic activated carbons from corn cobs using the pickle liquor from the surface treatment of iron and steel
Publication date: August 2018Source: New Carbon Materials, Volume 33, Issue 4Author(s): Fang Wang, Yan-qiu Dang, Xun Tian, Steven Harrington, Yan-qing MaAbstractCorn cobs were impregnated with the pickle liquor from the surface treatment of iron and steel at ambient temperature for 24 h, dried at 393 K for 12 h and carbonized at 573, 773 and 973 K for 1 h to obtain magnetic activated carbons (MACs). The adsorption of methyl orange (MO) onto the MACs was investigated under different conditions. Results show that the surface area of the MACs increases with carbonization temperature from 423.5 to 784.8 m2 g−1. The MACs cons...
Source: New Carbon Materials - October 5, 2018 Category: Chemistry Source Type: research
A dramatic improvement in the tensile strength of fullerene needle-like crystals
Publication date: August 2018Source: New Carbon Materials, Volume 33, Issue 4Author(s): Toshio Konno, Takatsugu Wakahara, Kun'ichi Miyazawa, Kazuhiro MarumotoAbstractNeedle-like crystals consisting of a solid solution of C60-C70 fullerene were synthesized by a liquid-liquid interfacial precipitation method using toluene and 2-propanol as solvents. A machined crystal with a V-notch was placed in a focused ion beam scanning electron microscope where it was bent until fracture by pushing it with a molybdenum probe to measure its mechanical properties and its fracture surface was examined. The crystals had a tensile strength o...
Source: New Carbon Materials - October 5, 2018 Category: Chemistry Source Type: research
Synthesis of porous graphene-like carbon materials for high-performance supercapacitors from petroleum pitch using nano-CaCO3 as a template
Publication date: August 2018Source: New Carbon Materials, Volume 33, Issue 4Author(s): Ming-jie Liu, Feng Wei, Xue-mei Yang, Shi-an Dong, Ying-jie Li, Xiao-jun HeAbstractPorous graphene-like carbon materials (PGCMs) for supercapacitors were synthesized from petroleum pitch by a nano-CaCO3 template strategy combined with KOH activation. The PGCMs were characterized by TEM, XPS, Raman spectroscopy and N2 adsorption. Results show that their specific surface areas are 1542-2305 m2·g−1, depending on the template/pitch ratio, KOH/pitch ratio and activation temperature. The PGCMs feature interconnected graphene-like carbon la...
Source: New Carbon Materials - October 5, 2018 Category: Chemistry Source Type: research
One-pot synthesis of N, S co-doped photoluminescent carbon quantum dots for Hg2+ ion detection
Publication date: August 2018Source: New Carbon Materials, Volume 33, Issue 4Author(s): Ju-meng Wei, Bi-tao Liu, Xin Zhang, Chang-chun SongAbstractN and S co-doped carbon quantum dots (N, S-CQDs) with a high fluorescence quantum yield (12.6%) were synthesized by a one-pot hydrothermal method. Results indicate that the N, S-CQDs have a small particle size and an amorphous structure, exhibiting unique surface states and excitation wavelength-independent fluorescent properties. Co-doping of N and S increases the electron-transfer rate and improves the coordination interaction between the N, S-CQDs and Hg2+ ions. The N, S-CQDs...
Source: New Carbon Materials - October 5, 2018 Category: Chemistry Source Type: research
