from Part D - Hydrodynamics
Published online by Cambridge University Press: 05 November 2012
Historical review and introduction to biological problems
1875–1880
J. Kerr first observed the transient electric birefringence effect (TEB) and established that the birefringence is proportional to the square of the field strength. Later, the law was named after him.
1880–1920
During this time high d.c. voltage generation was used in the study of TEB. It seriously hampered the application of TEB to the study of aqueous solutions because of their conductivity. In 1940–1950 a few groups (W. Kaye and R. Devaney, N. A. Tolstoy and P. P. Feofilov, C. T. O'Konski and B. H. Zimm, and H. Benoit) independently initiated the measurements of the electric birefringence of colloidal systems using a short rectangular electrical pulse. This greatly reduces the heating and polarisation effects, which are most critical in studies biological macromolecules.
1910
L. Langevin proposed the first theory for electric birefringence. In 1918 M. Born generalised the theory. It was shown that the orientation of optically anisotropic molecules may be caused by a permanent dipole momentum or its electrical anisotropy, or both. In 1931, A. Peterlin and H. A. Stuart extended the theory to suspensions of rigid particles.
1951
H. Benoit developed a theory for transient phenomena by solving the diffusion equation, which describes the rotational diffusion of axially symmetric rigid macromolecules following the establishment and disappearance of an electric field. He showed that the rotational diffusion coefficients can be obtained from the decay curve and the mechanism of electrical orientation can be elucidated from the build-up curve.
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