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Trends in Colloid and Interface Science XI pp 38–40Cite as

The behavior of ferric oxide hydrosols in the presence of urea

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Part of the book series: Progress in Colloid & Polymer Science ((PROGCOLLOID,volume 105))

Abstract

The effect of urea on the stability of α-haematite hydrosols in the presence of various monovalent ions was studied on each side of the pzc (pH 8.2) by measurements of the critical coagulation concentration (CCC) of the hydrosol.

It was observed that for pHs lower than the pzc, the effect of urea depends strongly on the nature of coagulating ion and on the pH:The CCC values of IO −3 increases with urea concentrations but those of ClO −4 and Cl− decreases. For pHs higher than the pzc, an inversion of the cationic adsorption sequence was observed. This behavior is in a good agreement with the well-known action of urea on the structure of water and also with the general property of the α-haematite water interface.

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Authors and Affiliations

  1. Service de Chimie Analytique Facultè des Sciences C.P.I. 255, Université Libre de Bruxelles, 2, Boulevard du triomphe, 1050, Bruxelles, Belgium

    Dr. H. Amhamdi, F. Dumont & C. Buess-Herman

Authors
  1. Dr. H. Amhamdi
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  2. F. Dumont
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  3. C. Buess-Herman
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Editor information

J. B. Rosenholm B. Lindman P. Stenius

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Dedicated to the memory of Julie and Mélissa

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© 1997 Steinkopff Verlag

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Amhamdi, H., Dumont, F., Buess-Herman, C. (1997). The behavior of ferric oxide hydrosols in the presence of urea. In: Rosenholm, J.B., Lindman, B., Stenius, P. (eds) Trends in Colloid and Interface Science XI. Progress in Colloid & Polymer Science, vol 105. Steinkopff. https://doi.org/10.1007/BFb0110959

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  • DOI: https://doi.org/10.1007/BFb0110959

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  • Publisher Name: Steinkopff

  • Print ISBN: 978-3-7985-1086-9

  • Online ISBN: 978-3-7985-1660-1

  • eBook Packages: Springer Book Archive

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