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This article in SSSAJ

  1. Vol. 34 No. 2, p. 358-360
    Received: Oct 20, 1969
    Accepted: Oct 31, 1969

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Molecular Weight of Montmorillonite from Optical Transmission Measurements1

  1. N. Lahav2 and
  2. A. Banin3



The weight average molecular weight of small Na-montmorillonite particles in aqueous suspension have been determined by means of optical density (OD) measurements. In the wavelength range of λ = 4000A to 6000A and in dilute clay suspension which obeys Beer-Lambert Law, the slope of the straight line of log (OD) vs. log λ is proportional to the major dimension of the particles. Assuming a disc geometry and the number of unit layers in a clay particle, and working with suspension with a slope near −4, the weight average molecular weight was found by using light scattering theory. The results agree reasonably with other data from the literature.

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