Light scattering,flow birefringence and generalized hydrodynamics |
| |
| Authors: | Thomas Keyes |
| |
| Institution: | 1. Department of Chemistry , University of California , Los Angeles, California, 90024;2. Department of Chemistry , Massachusetts Institute of Technology , Cambridge, Massachusetts, 02139 |
| |
| Abstract: | The stress-optical coefficient ?, which is measured in flow birefringence experiments, is calculated using the generalized hydrodynamic equations which have been recently used to explain the k-dependent fine structure observed in depolarized (VH) light scattering. The resulting expressions allow a comparison of the strength of the birefiringence effect with that of the light scattering fine structure effect in a given liquid. It is seen that the combination of flow birefringence and VH scattering measurements yields the orientational structure factor g (2) of Ben-Reuven and Gershon. The theory is in reasonable agreement with experiment. The combination of our results with those of Raman and Krishnan yields a simple expression for the parameter δ which measures the strength of the stress-orientational effect. The dependence of the stress-optimal coefficient upon orientational order is briefly discussed. |
| |
| Keywords: | |
|
|
