Suspension birefringence results

For a dilute suspension, this result can be compared with a weakly birefringent and dichroic material. In this case, from equations (2.15) and (2.21),... 

The scattering of light from a suspension of particles will cause the light transmitted through such a material to be changed in phase and amplitude. If particles are nonspheri-cal, and have a net orientation, a birefringence and dichroism will result. 

The goal of the following discussion is to study the low-frequency dynamic birefringence induced by an alternating field in a suspension of acicular particles with dipole moments, that is, the system of type 1 according to the classification given above. The results presented are obtained avoiding any... 

Depending on the scheme chosen, the birefringence experiments provide [143,144] direct measurements of either Av or (Av)2. To present the theoretical results in a form suitable for comparison with the experimental data, let us consider the orientational oscillations induced in the dipolar suspension by a harmonic held H = Hq cos (at and analyze the frequency dependencies of the spectra of the order parameters (P2) and (Pi)2- As formula (4.371) shows, the latter quantities are directly proportional to Av and (Av)2, respectively. Since the oscillations are steady, let us expand the time-dependent orientational parameters into the Fourier series... 

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