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Electrostatic charge (also known as triboelectric charge) on
microparticles and microspheres have been of interest to scientists in
chemical, pharmaceutical, cosmetic, drug delivery, displays and other
industries for many years. Until recently there were no reliable
techniques to measure or quantify electrostatic charge on
microparticles, with too many uncontrolled variables the measurements
were inconsistent. As a result scientists were treating charging as a
black box process, performing the experiments blindly as trial and
With recent advances in microsphere manufacturing, techniques
have been developed that promise not only to quantify the charge on
microspheres, but control it in the manufacturing process.