Thesis-1972-Riley.pdf (4.06 MB)
The rheology of concentrated aqueous suspensions of calcium carbonate
thesis
posted on 2018-08-31, 11:54 authored by Peter W. RileyThe 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 RileyPublisher 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
1972Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.Language
- en