Refractive-index measurement of turbid colloidal fluids by transmission near the critical angle

Meeten, G.H. and North, A.N. (1991) Refractive-index measurement of turbid colloidal fluids by transmission near the critical angle. Measurement Science & Technology, 2 (5). pp. 441-447. ISSN 0957-0233. (The full text of this publication is not available from this repository)

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Official URL
http:/dx.doi.org/10.1088/0957-0233/2/5/005

Abstract

We describe a modified Abbe refractometer for measuring the optical transmittance across a plane interface from a diffusely scattering turbid sample into a prism. When the prism refractive index exceeds that of the sample, a critical angle is present even when the sample contains particles which are wavelength sized or larger. Hence, the sample refractive index may be measured. However, measurements of transmittance near the critical angle show a poor definition of the critical angle for some samples, with a consequent loss of experimental precision in the refractive index. The method is applied to several polymer latex dispersions and some glass ballotini. For all lattices the measured refractive index varies linearly with latex volume fraction. For all dispersions except one the dependence of refractive index on volume fraction is in good agreement with the theory of refractive index based on Mie scattering by spherical particles.

Item Type: Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: O.O. Odanye
Date Deposited: 08 Oct 2009 17:33
Last Modified: 08 Oct 2009 17:33
Resource URI: http://kar.kent.ac.uk/id/eprint/23023 (The current URI for this page, for reference purposes)
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