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Start Over Author "You, Caiyin" Publisher elsevier bv
55 results on '"You, Caiyin"'

20. A controllable soft-templating approach to synthesize mesoporous carbon microspheres derived from d-xylose via hydrothermal method

Author

Su Jian, Cheng Youliang, Wang Zhen, Fang Changqing, You Caiyin, Yang Mannan, and Huang Zhi-gang

Subjects
Materials science, Polymers and Plastics, Carbonization, Scanning electron microscope, Mechanical Engineering, Metals and Alloys, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Hydrothermal circulation, 0104 chemical sciences, Chemical engineering, chemistry, Mechanics of Materials, Transmission electron microscopy, Specific surface area, Materials Chemistry, Ceramics and Composites, Gravimetric analysis, Graphite, 0210 nano-technology, Carbon
Abstract

Highly dispersed carbon microspheres (CMSs) derived from D-xylose were successfully synthesized under hydrothermal conditions and followed by further carbonization, in which F127 was used as a soft template. As-synthesized products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), flourier transform infrared spectroscopy (FT-IR), thermal gravimetric (TG) and X-ray diffraction (XRD). The results showed that the morphology and structure of the CMSs prominently depended on the stirring speed during hydrothermal reaction. The resultant CMSs principally had non-porous structure without stirring and had a very smooth surface. When the stirring speed increased to 200 rpm, the synthesized mesoporous carbon microspheres at 220 °C for 24 h (CMSs-5) had a uniform size distribution of 1–1.4 μm and a specific surface area of 452 m2/g. Nevertheless, with further increasing to 400 rpm, as-fabricated carbon products were mostly amorphous with a low degree of sphericity. Results demonstrated that the diameter of the products decreased with the increase of stirring speed. Furthermore, the sphericity product yield of CMSs reduced with the increase of stirring speed. XRD result showed that all the obtained samples contained partial graphite phase. In addition, a formation mechanism was proposed that involved polymerization product as the precursors for microsphere formation. The controllable and green strategy may provide a great convenience to study properties and applications of carbon microspheres.

Published
2020

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