Colloidal surface-polymer interaction

Colloidal surface-polymer interaction, 96 Complex fluids, definition, 1 Configuration of polyelectrolytes adsorbed onto microcapsule surface, 85-94 application in on-off control of enzyme reactions, 91,93/... 

We also attempt to distinguish between surface physical chemistry and colloid and polymer physical chemistry. This distinction is not always possible, and clearly many of the features of physical chemistry of surfaces, such as the electrostatic interactions and adsorption of macromolecules, have a significant... 

The stability of colloids can also be dramatically altered by inclusion of polymeric materials. If the polymer interacts favourably with the particle surfaces, i.e. it adsorbs, then both an increase and a reduction in stability is possible, via modification of the electrostatic interaction of the polymer is charged or a reduction in the van der Waals attraction. 

Adhesion of bacteria to surfaces is believed to be mediated by long-ranging colloidal interactions, which hold bacteria in the close proximity of surfaces, thereby facilitating short-ranging hydrophobic interactions and adsorption of cell surface polymers to the surface. The extent of these interactions, and particularly the hydrophobic ones, depends strongly on the properties of... 

B. Vincent, J. Edwards, S. Emmett, and R. Croot Phase Separation in Dispersions of Weakly Interacting Particles in Solutions of Non Adsorbing Polymer. Colloids Surfaces 31, 267 (1988). 

Up to date, besides the SFA, several non-interferometric techniques have been developed for direct measurements of surface forces between solid surfaces. The most popular and widespread is atomic force microscopy, AFM [14]. This technique has been refined for surface forces measurements by introducing the colloidal probe technique [15,16], The AFM colloidal probe method is, compared to the SFA, rapid and allows for considerable flexibility with respect to the used substrates, taken into account that there is no requirement for the surfaces to be neither transparent, nor atomically smooth over macroscopic areas. However, it suffers an inherent drawback as compared to the SFA It is not possible to determine the absolute distance between the surfaces, which is a serious limitation, especially in studies of soft interfaces, such as, e.g., polymer adsorption layers. Another interesting surface forces technique that deserves attention is measurement and analysis of surface and interaction forces (MASIF), developed by Parker [17]. This technique allows measurement of interaction between two macroscopic surfaces and uses a bimorph as a force sensor. In analogy to the AFM, this technique allows for rapid measurements and expands flexibility with respect to substrate choice however, it fails if the absolute distance resolution is required. 

P. M. Claesson, Surface Forces Apparatus Studies of Polymers, Polyelectrolytes and Polyelectrolyte-Surfactant Mixtures at Interfaces (P. Dubin and R. Farinato, eds.), Colloid-Polymer Interactions From Fundamentals to Practice, Wiley, New York, 1999, p. 287. 

Ringenbach E, Chauveteau G, Pefferkorn E. Effect of soluble aluminum ions on polyelectrolyte-alumina interaction. Kinetics of polymer adsorption and colloid stabilization. Colloids Surfaces A 1995 99 161—173. 

Winnik FM, Regismond STA. Fluorescence methods in the study of the interactions of surfactants with polymers. Colloids Surfaces A 1996 118 1-39. 

Our light scattering scheme is not only capable of measuring the amount of the polymer adsorbed on the colloidal surface, but also can probe changes of the microscopic interaction between the colloidal particles due to the polymer adsorption. Figure 4 shows the measured P p2)/M as a function of the polymer concentration p 2 for PEP (closed circles) and amine-PEP (open circles). As mentioned in the theory section (see the discussion about Eq. (3)), P p2) related to the effective second virial coefficient for the colloidal particles in the polymer solution. The lower solid line in Fig. 4 is a fit to the linear function 3.4(1 — 51p2)- The intercept of the linear function is just the second virial coefficient 6ii(0)/Mi measured at P2 = ( ))- have calculated... 

Colloid-polymer interactions particulate, amphiphilic, and biological surfaces developed from a symposium / sponsored 1 the Division of Polymer Chemistry, Inc., and by the DivisW of Colloid and Surface Chemistry of the American Chemical Society at the 2Q3rd National Meeting of the American Chemical Society, San Francisco, California, April 5-10,1992 Paul L. Dubin, Penger Tong, editors. 

This volume consists of four parts. The first part is devoted to theoretical studies and computer simulations. These studies deal with the structure and dynamics of polymers adsorbed at interfaces, equations of state for particles in polymer solutions, interactions in diblock copolymer micelles, and partitioning of biocolloidal particles in biphasic polymer solutions. The second part discusses experimental studies of polymers adsorbed at colloidal surfaces. These studies serve to elucidate the kinetics of polymer adsorption, the hydrodynamic properties of polymer-covered particles, and the configuration of the adsorbed chains. The third part deals with flocculation and stabilization of particles in adsorbing and nonadsorbing polymer solutions. Particular focus is placed on polyelectrolytes in adsorbing solutions, and on nonionic polymers in nonadsorbing solutions. In the final section of the book, the interactions of macromolecules with complex colloidal particles such as micelles, liposomes, and proteins are considered. 

---