Brownian motion of microspheres in binary liquid mixtures
Abstract
The dynamics of a probe particle undergoing Brownian motion is utilized to discriminate different binary liquid mixtures. Brownian motion statistics depends on liquid viscosity that also varies when two or more liquids are mixed together. Motion dynamics is a function of the diffusion coefficient, D and the mean square displacement, MSD that is derived from the probe particle trajectory. The motion of microspheres in nanopure water, technical grade ethanol, and 50% (volume fraction) aqueous ethanol solutions, is investigated experimentally. Comparing computed D values from trajectories of micro-spheres in nanopure water and technical grade alcohol show that different liquids can be differentiated using Brownian motion. D is a measurable quantity that can be used to determine the viscosity of different liquids and liquid mixtures.
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