Length Dependence of the Ionic Contribution to the Anisotropy of the Electrical Polarisability for Rigid Rods

  • V. J. Morris
  • G. J. Brownsey
  • B. R. Jennings


A method is developed, based on transient electric birefringence, for evaluating the length (ℓ) dependence of the ionic component of the anisotropy of the electrical polarisability (△α), for polydisperse, dilute suspensions of rod-like particles. Two average values of the rotary diffusion coefficient, obtained from the birefringence decay under specific experimental conditions, are combined with an average translational diffusion coefficient, from photon correlation data, to generate the best log-normal function to fit the particle size distribution and to estimate the length dependence of △α These factors are employed to analyse the field dependence of the birefringence and to obtain the size independent part of △α. Illustrative data are given for aqueous suspensions of sepiolite. A value of △α proportional to ℓ1.8 was obtained.


Electrical Polarisability Length Dependence Translational Diffusion Coefficient Particle Length Particle Size Distribution Function 
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Copyright information

© Plenum Press, New York 1979

Authors and Affiliations

  • V. J. Morris
    • 1
  • G. J. Brownsey
    • 1
  • B. R. Jennings
    • 1
  1. 1.Electro-Optics Group, Physics DepartmentBrunel UniversityUxbridge, MiddlesexUK

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