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The Pore Structure Determination of Carbon Aerogels |
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| Authors: | Y. Hanzawa K. Kaneko N. Yoshizawa R.W. Pekala M.S. Dresselhaus |
| Affiliation: | (1) Physical Chemistry, Material Science, Graduate School of Science and Technology, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263, Japan;(2) Carbon Materials Laboratory, National Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, Ibaraki, 305, Japan;(3) Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;(4) Department of Electrical Engineering and Computer Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA |
| Abstract: | The detailed adsorption isotherms of nitrogen on carbon aerogels at 77 K were measured. The N2 adsorption isotherm had a marked hysteresis. The adsorption isotherms were analyzed by high resolution  s-plots to evaluate their porosity. The s-plots showed an explicit upward deviation from the linearity below s = 0.5, suggesting the presence of micropores. The mesoporosity and microporosity were separately determined from the s-plot. The predominant pores in carbon aerogels were mesopores and the percentage of micropores was in the range of 5 to 10% of the total pore volume. The N2 adsorption hysteresis was analyzed with the Saam-Cole theory under the assumption of the cylindrical pore shape. The parameters determined from the Saam-Cole method were associated with the carbon aerogel structure. |
| Keywords: | mesopore structure Saam-Cole theory adsorption hysteresis carbon aerogel nitrogen adsorption |
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