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Proceedings Paper

Measurements of charged colloidal bulk moduli using optical bottles
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Paper Abstract

We report a novel method, the optical bottle that was used to directly measure the osmotic bulk modulus for a colloid suspension. We determined the bulk modulus by optically trapping multiple nanoparticles and considered a mechanical balance between the compressive laser gradient force pressure and the resulting resistive osmotic pressure. Osmotic bulk moduli results measured with the optical bottle are presented for aqueous suspensions of latex particles as a function of solution ionic strength; and are compared to results from identical samples measured using turbidity spectra.

Paper Details

Date Published: 28 August 2010
PDF: 9 pages
Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 776226 (28 August 2010); doi: 10.1117/12.860953

Published in SPIE Proceedings Vol. 7762:
Optical Trapping and Optical Micromanipulation VII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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