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TitleIndividual nanoparticle zeta potential measurements using tunable resistive pulse sensing
Publication TypeConference Paper
Year of Publication2013
AuthorsWeatherall, E., Willmott G.R., and Glossop B.
Conference NameProceedings of the International Conference on Sensing Technology, ICST
Date Published2013
KeywordsBiomedical technologies, Coulter counters, Electrophoretic mobility, Individual nanoparticles, Mineral extraction, Nanoparticles, Needles, Polystyrene nanoparticles, Potential values, Resistive pulse sensing, Zeta potential, Zeta potential measurements
AbstractTunable resistive pulse sensing has been used to measure the zeta potential of two sets of 200 nm diameter polystyrene nanoparticles in 0.1 M KCl electrolyte. Data were analysed using two methods, both of which yield particle-by-particle zeta potential values based on electrophoretic mobility. Five pore specimens were used, and in most cases data clearly indicate that one particle set had a higher (less negative) zeta potential than the calibrated zeta potential of the other particle set (-35 mV). Three tungsten needles were used to fabricate the pores, and comparable results were obtained for pores made by the same needle. Measurements were carried out with varying potential applied, and a reliable working range of 0.3 to 0.6 V was observed. Measurement of zeta potentials on individual nanoparticles is important for colloidal applications such as foods, cosmetics, mineral extraction and biomedical technologies. © 2013 IEEE.

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