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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 1 — Jan. 1, 1999
  • pp: 197–204

Investigation of Static Structure Factor in Dense Suspensions by Use of Multiply Scattered Light

Rajesh Shinde, Ganesh Balgi, Steven Richter, Sukanta Banerjee, Jeffery Reynolds, Joseph Pierce, and Eva Sevick-Muraca  »View Author Affiliations


Applied Optics, Vol. 38, Issue 1, pp. 197-204 (1999)
http://dx.doi.org/10.1364/AO.38.000197


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Abstract

Near-infrared, frequency-domain photon migration measurements of phase shift are used to derive accurate values of isotropic scattering coefficients in concentrated, interacting suspensions of aqueous polystyrene microspheres with volume concentrations ranging from 1% to 45% by solids and mean diameters ranging from 135 to 500 nm. Under conditions of high ionic strength, the isotropic scattering coefficient can be quantitatively predicted by the Percus–Yevick model for hard-sphere interactions and Mie theory. In addition, the attractive interactions between scatterers arising from the addition of soluble poly(ethylene glycol) with molecular weights of 100 and 600 K cause hindered scattering. The increases in static structure and decreases in isotropic scattering coefficient agree with that predicted by Mie theory and the depletion interaction model developed by Asakura and Oosawa [J. Chem. Phys. 22, 1255 (1954)]. These results demonstrate the success of monitoring interaction between particles by use of multiple-scattered light and the necessity of incorporating models for these interactions when predicting scattering of dense, concentrated suspensions.

© 1999 Optical Society of America

OCIS Codes
(170.5280) Medical optics and biotechnology : Photon migration
(350.4990) Other areas of optics : Particles

Citation
Rajesh Shinde, Ganesh Balgi, Steven Richter, Sukanta Banerjee, Jeffery Reynolds, Joseph Pierce, and Eva Sevick-Muraca, "Investigation of Static Structure Factor in Dense Suspensions by Use of Multiply Scattered Light," Appl. Opt. 38, 197-204 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-1-197


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