Changes in the thermophysical properties of microcrystalline cellulose as function of carbonization temperature

被引：51
|
作者：
Rhim, Yo-Rhin [2 ]
Zhang, Dajie [1 ]
Rooney, Michael [3 ]
Nagle, Dennis C. [1 ]
Fairbrother, D. Howard [4 ]
Herman, Cila [2 ]
Drewry, David G., III [1 ]
机构：
[1] Johns Hopkins Univ, Adv Technol Lab, Baltimore, MD 21211 USA
[2] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA
[3] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA
[4] Johns Hopkins Univ, Dept Chem, Baltimore, MD 21218 USA
来源：
CARBON | 2010年 / 48卷 / 01期
关键词：
ORDERED POROUS CARBON; THERMAL-CONDUCTIVITY; CARBON/CARBON MATERIALS; PYROLYTIC-GRAPHITE; HEAT-CAPACITY; WOOD; DIFFUSIVITY; SPECTROSCOPY; DIFFRACTION; HYDROGEN;
D O I：
10.1016/j.carbon.2009.07.048
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Thermophysical properties of carbon materials derived from microcrystalline cellulose have been studied under vacuum and compared with earlier measurements conducted under nitrogen to better understand the influence of porosity, composition, microstructure, and atmosphere effects. The effective thermal conductivity in vacuum is lower than that observed in nitrogen primarily due to the conductivity of nitrogen gas. Radiation effects in both atmospheres were determined to be negligible. Reduction of thermal diffusivity in nitrogen was attributed to the effects of nitrogen gas phonon scattering. The trends for electrical and thermal property changes with structure are similar but not identical due to the differences in electron and phonon transport mechanisms. (C) 2009 Elsevier Ltd. All rights reserved.
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页码：31 / 40
页数：10
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