Dynamic colloidal interactions between protein-stabilised particles—experiment and simulation
2000
Experimental
data are compared with computer simulation of interactions between two colloidal particles in a laminar
shear field, when one particle is fixed to a wall and a second particle is freely mobile in the shear field
in the narrow gap formed by a second parallel, moving wall. Both colloidal and hydrodynamic interactions
are taken into account in simulating the scattering of the mobile particle by the fixed particle. A detailed explanation is given of the experimental procedure required to perform and observe such particle collisions successfully,
in order to extract the information required to compare with the simulated results. Polystyrene latex particles and
oil droplets of diameter ca. 5 μm, stabilised by pure β-casein, αs1-casein, sodium caseinate or gelatine, were studied in water over a range of pH values and ionic strengths. Within experimental error, the scattering in these systems could not be detected as varying markedly, due mainly to random noise introduced by
Brownian motion, in agreement with the simulation results for a wide range of DLVO plus simple steric-type colloidal
interaction potentials. It is concluded that the dynamic
steric interactions for all the different protein layers, as measured by this technique, may
be quite similar,
or that a more complex
type of dynamic interaction may be involved.
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