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1 Bulletin of the Polish Academy of Sciences. Chemistry

1 1998

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A direct method of studying colloid interactions and adsorption at solid / liquid interfaces

Adamczyk Z., Szyk L., Warszyński P.

Bulletin of the Polish Academy of Sciences. Chemistry

1998

Vol. 46, No. 4

425-439

A new cell for direct in situ observations of colloid particle adsorption was developed. The controlled convective transport conditions were created by exploiting the slot impinging jet (SIJ) principle. Numerical solutions of the governing Navier-Stokes equation showed that the flow pattern in the cell can be approximated by the planeparallel stagnation flow with the perpendicular velocity component independent of the lateral distance X. Thus, the solid/liquid interface at distances close to the symmetry plane was found uniformly accessible for particle transport. This flow field was used to derive the mass transport equation which was then numerically solved to obtain the initial flux (adsorption rate) for various transport conditions. These theoretical predictions were verified experimentally using monodisperse polystyrene latex particles. A good agreement between predicted and measured initial flux was found for a broad range of Reynolds number and ionic strength of the particle suspension. This confirmed that the SIJ cell can be used as a useful tool of studying colloid and bioparticle interactions and adsorption under well-defined transport conditions.