TITLE

Densification-induced conductivity percolation in high-porosity pharmaceutical microcrystalline cellulose compacts

AUTHOR(S)
Strømme, M.; Niklasson, G. A.; Ek, R.
PUB. DATE
January 2003
SOURCE
Applied Physics Letters;1/27/2003, Vol. 82 Issue 4, p648
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The percolation theory is established as a useful tool in the field of pharmaceutical materials science. It is shown that percolation theory, developed for analyzing insulator-conductor transitions, can be applied to describe imperfect dc conduction in pharmaceutical microcrystalline cellulose during densification. The system, in fact, exactly reproduces the values of the percolation threshold and exponent estimated for a three-dimensional random continuum. Our data clearly show a crossover from a power-law percolation theory region to a linear effective medium theory region at a cellulose porosity of ∼0.7.
ACCESSION #
8954549

 

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