کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7854278 | 1508879 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Probing the evolution and morphology of hard carbon spheres
ترجمه فارسی عنوان
بررسی تکامل و مورفولوژی کره های سخت کربن
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
Monodispersed hard carbon spheres can be synthesized quickly and reproducibly by autogenic reactions of hydrocarbon precursors, notably polyethylene (including plastic waste), at high temperature and pressure. The carbon microparticles formed by this reaction have a unique spherical architecture, with a dominant internal nanometer layered motif, and they exhibit diamond-like hardness and electrochemical properties similar to graphite. In the present study, in situ monitoring by X-ray diffraction along with electron microscopy, Raman spectroscopy, neutron pair-distribution function analysis, and computational modeling has been used to elucidate the morphology and evolution of the carbon spheres that form from the autogenic reaction of polyethylene at high temperature and pressure. A mechanism is proposed on how polyethylene evolves from a linear chain-based material to a layered carbon motif. Heating the spheres to 2400-2800 °C under inert conditions increases their graphitic character, particularly at the surface, which enhances their electrochemical and tribological properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 68, March 2014, Pages 104-111
Journal: Carbon - Volume 68, March 2014, Pages 104-111
نویسندگان
Vilas G. Pol, Jianguo Wen, Kah Chun Lau, Samantha Callear, Daniel T. Bowron, Chi-Kai Lin, Sanket A. Deshmukh, Subramanian Sankaranarayanan, Larry A. Curtiss, William I.F. David, Dean J. Miller, Michael M. Thackeray,