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Formation of Aggregates and Structures in Dilute Solutions of Hydrogen Bentonites

Nature volume 145, pages 971–972 (1940)Cite this article

Abstract

A YIELD value is noticeable in hydrogen bentonites at a concentration lower than that at which thixotropy first appears. This seems to happen generally with bentonites. Some natural calcium bentonites show coacervation1. Coacervation of fine sub-fractions of a natural bentonite has been reported2 at concentrations above the thixotropic range. Hydrogen bentonites, however, show coacervation over a wide range and even below the thixotropic range of concentrations. Near about the concentration at which yield value becomes noticeable a sharp ehange in several properties has been observed. The cataphoretic velocity rapidly increases and tends to a maximum. The conductivity, (Σ, per gram of colloid can be calculated from the relation Σ = 1000 (Σc; π Σu)/C, where Σc is the specific conductivity at a concentration of C grams per litre and Σu that of its ultra-filtrate; it passes through a minimum if plotted against C or C.

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Authors and Affiliations

  1. Physical Chemistry Laboratory, University College of Science and Technology, 92, Upper Circular Road, Calcutta

    J. N. MUKHERJEE & N. C. SEN GUPTA

Authors
  1. J. N. MUKHERJEE
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  2. N. C. SEN GUPTA
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MUKHERJEE, J., GUPTA, N. Formation of Aggregates and Structures in Dilute Solutions of Hydrogen Bentonites. Nature 145, 971–972 (1940). https://doi.org/10.1038/145971b0

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