Polymer adsorption colloidal dispersions

Stabilization of Colloidal Dispersions by Polymer Adsorption, Tatsuo Sato and Richard Ruch... 

T Sato, R Ruch. Stabilization of Colloidal Dispersions by Polymer Adsorption (Surfactant Science Series, No. 9). New York Marcel Dekker, 1980, pp 65-119. 

Emulsions and Emulsion Technology (in three parts), edited by Kenneth J. Lissant Anionic Surfactants (in two parts), edited by Warner M. Linfieid see Volume 56) Anionic Surfactants Chemical Analysis, edited by John Cross Stabilization of Colloidal Dispersions by Polymer Adsorption, Tatsuo Sato and Richard Ruch... 

Protective colloids or polymeric materials can be adsorbed onto the surface of the dispersed phase. Polymer adsorption can be accomplished simply by... 

Among the various branches in colloid and interface science, polymer adsorption and its effect on the colloid stability is one of the most crucial problems. Polymer molecules are increasingly used as stabilizers in many industrial preparations, where stability is needed at a high dispersed phase volume fraction, at a high electrolyte concentration, as well as under extreme temperature and flow velocity conditions. 

Sato, T. Ruch, R., Stabilization of Colloidal Dispersion by Polymer Adsorption, Marcel Dekker, Inc., NY, 1980. 

Sato, T. and Ruch, R. Stabilization of colloidal dispersions by polymer adsorption, New York Dekker 1980... 

The use of natural and synthetic polymers to stabilize aqueous colloidal dispersions is technologically important, with much research in this area being focused on adsorption and steric stabilization [286-291]. Steric stabilization is discussed further in the next section. 

Addition of soluble macromolecules (polymers) in the colloidal dispersion can stabilize the colloidal particles due to the adsorption of the polymers to the particle surfaces. The soluble polymers are often called protective agents or colloids. If the protective agents are ionic and have the same charge as the particles, the electrical double-layer repulsive forces will be increased and thus the stability of the colloidal particles will be enhanced. In addition, the adsorbed polymers may help weaken the van der Waals attraction forces among particles. However, the double-layer repulsion and the van der Waals attraction cannot account for the entire stabilization of the particle dispersions. 

In the latter case the total interaction, which is what can be measured, is affected by the net charge of the surface and the adsorbed layer, ion-ion correlations, bridging interactions and steric confinement of the polymer chain [116]. We note that polyelectrolytes are often present as additives in colloidal dispersions and the character of the forces generated by the polyelectrolyte adsorption layers has a paramount influence on stability of these colloidal systems. With the aim to illustrate what can be learnt about polyelectrolyte adsorption layers using the SFA, we will look at the influence of the polyelectrolyte charge density on the forces acting between surfaces coated with polyelectroytes. We will consider an example where the polyelectrolyte charge density is varied by a systematic... 

The adsorption of polymers has numerous technological applications. In the majority of these applications, the adsorption of the polymer occurs on the surface of colloidal particles, and the purpose Is to modify the properties of colloidal dispersions. 

D.H. Napper, Polymeric Stabilissation of Colloidal Dispersions, Acad. Press (1983). (Gives much attention to steric repulsion between polymer layers, but adsorption as such is not considered in detail. 

Tadros, T.F. (1982) Polymer adsorption and colloid stability, in The Effect of Polymers on Dispersion Properties (ed. T.F. Tadros), Academic Press, London. Thompson, W. (Lord Kelvin) (1871)... 

FIGURE 7.27 Schematic representation of an adsorbed polymer chain at the solid-liquid interface. (From Sato, T. and Ruch, R., in Steric Stabilization of Colloidal Dispersion by Polymer Adsorption, Marcel Dekker, New York, 1980. With permission.)... 

The colloidal stabilization of aqueous dispersions by polymer surfactants is believed to be a result of the adsorption of the amphiphilic macromolecules on the particle surface. This adsorption results in the formation of mono- or multi-layers of certain structure and thickness which provide sterical and/or electrostatic stabilization effects [1-5], Polymer adsorption from aqueous solution on a particle surface is a result of specific interactions of various active sites on the particle surface with corresponding sites (groups) of the macromolecule. Therefore the adsorption behaviour and the colloidal stabilization may be used as a sensitive approach (tool) to elucidate the effects of the polymers structural differences on their behaviour on the liquid-solid interface [6-9],... 

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