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27 Jan 2003

Volume 82, Issue 4, pp. 487-659

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Appl. Phys. Lett. 82, 559 (2003); http://dx.doi.org/10.1063/1.1539543 (3 pages)

P. R. C. Kent and Alex Zunger
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Densification-induced conductivity percolation in high-porosity pharmaceutical microcrystalline cellulose compacts

M. Strømme, G. A. Niklasson, and R. Ek

Appl. Phys. Lett. 82, 648 (2003); http://dx.doi.org/10.1063/1.1539902 (3 pages) | Cited 4 times

Online Publication Date: 22 January 2003

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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. © 2003 American Institute of Physics.
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72.10.-d Theory of electronic transport; scattering mechanisms
87.10.-e General theory and mathematical aspects
45.70.Cc Static sandpiles; granular compaction
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
72.60.+g Mixed conductivity and conductivity transitions
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