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|Type:||Artigo de periódico|
|Title:||Applications Of A Granular Model And Percolation Theory To The Electrical Resistivity Of Heat Treated Endocarp Of Babassu Nut|
de Sousa J.C.
|Abstract:||The volume fraction, X, of the conducting phase in a granular structure defined in the carbon matrix and applicable to heat treated biomass carbons is calculated as a function of structural parameters obtained from X-ray diffraction and small angle X-ray scattering measurements. The room temperature electrical resistivity of heat treated endocarp of babassu nut with heat treatment temperatures up to 2200°C is thus presented as a function of X. The drop of twelve orders of magnitude in the resistivity is explained as a percolation transition in the granular structure, X being the fundamental parameter. The electronic conduction process occurs in this structure with the involvement of microcrystallites and micropores. © 1987.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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