Surfactant adsorption hydrophobic methylated surfaces

Most of the examples discussed are related to reversible (equilibrium) conditions. The behavior of the adsorption layer formed on hydrophobic methylated surfaces in aqueous surfactant solutions is shown in Figure 4.26a. Compression of the particles resulted in the retraction of the adsorption layer, which returned once the particles were separated. The situation is principally different in the case of adsorption from a nonpolar phase on polar particles, as is schematically shown in Figure 4.27b. The fixation of the adsorption layer by chemisorption, as in the case of the adsorption of amines on silicate glass, resulted in an adsorption layer that had its own strength, and a certain... 

Surface modification by polymer adsorption is an alternative to surface modification by polymer grafting. For example, polystyrene nanospheres coated by Poloxamer or Poloxamine (Ilium and Davis, 1983 Muller, 1991) or poly(methyl methacrylate) colloidal carriers coated by Poloxamer (Trds-ter and Kreuter, 1988) circulate longer in blood. This family of surfactants consist of poly(propylene glycol) (PPG) blocks, which adsorb on the hydrophobic polystyrene surface, and of more hydrophilic PEG blocks, which stick out of the surface in aqueous solutions and prevent opsonin adsorption. In spite of the increase in blood circulation time, particle coating by polymer adsorption was found to have several drawbacks (Petrak, 1993) ... 

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