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Molecular Weight of Montmorillonite from Optical Transmission Measurements
Author(s) -
Lahav N.,
Banin A.
Publication year - 1970
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1970.03615995003400020051x
Subject(s) - montmorillonite , suspension (topology) , wavelength , particle (ecology) , aqueous suspension , particle size , scattering , materials science , light scattering , analytical chemistry (journal) , aqueous solution , dimension (graph theory) , chemistry , mineralogy , optics , molecular physics , physics , chromatography , mathematics , geology , composite material , oceanography , homotopy , pure mathematics
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.