Loughborough University
Browse
Thesis-1972-Riley.pdf (4.06 MB)

The rheology of concentrated aqueous suspensions of calcium carbonate

Download (4.06 MB)
thesis
posted on 2018-08-31, 11:54 authored by Peter W. Riley
The rheological behaviour of concentrated aqueous suspensions of calcium carbonate dispersed with a surfactant, comprising a 1:1 mole ratio mixture of lauric acid and a polyethoxy-nonylphenol with an ethylene oxide chain length of nine units, is shown to be pseudoplastic (shear-thinning). This behaviour is shown to be consistent with the adsorption characteristics of this surfactant system, the sedimentation behaviour, the variation of electrophoretic mobility with surfactant concentration and the particle potential energy of interaction curves. Equivalent determinations were made on suspensions of calcium carbonate without dispersant, dispersed with the non-ionic component alone and dispersed with a polymeric anionic surfactant. The rheological behaviour of the first two systems was also pseudoplastic and the last system showed shear thinning followed by shear thickening behaviour as the shear rate was increased. A possible mechanism is suggested for this reversal of behaviour upon increasing the shear rate.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Chemical Engineering

Publisher

© Peter William Riley

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

1972

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.

Language

  • en

Usage metrics

    Chemical Engineering Theses

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC