Abstract
Measurements have been made of the linear birefringence and linear dichroism of submicron-sized, crystalline, polytetrafluorethylene (PTFE) particles dispersed in water, investigating the effects of concentration up to a PTFE volume fraction of ∼0.45. At high dilutions the measured quantities are closely proportional to volume fraction, and a value for the refractive index anisotropy of crystalline PTFE is obtained from the data. At higher volume fractions (>0.01) the measured quantities vary nonlinearly with volume fraction, and a combination of radial and angular interparticle interactions is suggested to explain the data.
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