Abstract
This paper presents the results of an experimental study on electrostatic
behavior of lactose and glucose which are commonly used in the pharmaceutical
industry as additives. Resistivities and frictional charging of samples
with different proportions of lactose and glucose were measured.
Powder samples were charged by sliding them down into the Faraday's
cup via a pipe. Resistivity was found to follow a linear relationship
with the concentration but the nature of frictional charging changed
considerably when mixtures were charged instead of pure additives.
Both pure additives charged positively when slid into the Faraday's
cup via a glass pipe but some mixtures became negatively charged
due to powder-powder contacts within the flow and near the pipe surface.
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