Fast and precise measurements of particle charge with optical trapping electrophoresis

Filip Beunis; Filip Strubbe; Bart Verboven; Kristiaan Neyts; Dmitri Petrov

doi:10.1117/12.841302

8 February 2010 Fast and precise measurements of particle charge with optical trapping electrophoresis

Filip Beunis, Filip Strubbe, Bart Verboven, Kristiaan Neyts, Dmitri Petrov

Proceedings Volume 7613, Complex Light and Optical Forces IV; 76130B (2010) https://doi.org/10.1117/12.841302
Event: SPIE OPTO, 2010, San Francisco, California, United States

Abstract

We subject micrometer-sized, optically trapped colloidal particles in a non-polar liquid to a sinusoidally varying electric field, and measure their resulting movement. From this movement, we calculate the electrophoretic mobility and charge of the particle in the liquid. The use of high frequencies of the electric field (well above the corner frequency of the optical tweezers) allows us to estimate the electrical charge of colloidal particles with an accuracy of the order of the electron charge in a time interval of only 10 ms. This technique can be used to provide valuable information about the dynamics of the poorly understood processes that lead to the charge on colloidal particles in non-polar liquids.

Citation Download Citation

Filip Beunis, Filip Strubbe, Bart Verboven, Kristiaan Neyts, and Dmitri Petrov "Fast and precise measurements of particle charge with optical trapping electrophoresis", Proc. SPIE 7613, Complex Light and Optical Forces IV, 76130B (8 February 2010); https://doi.org/10.1117/12.841302

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