Interaction forces between surfaces coated with highly branched polyelectrolytes
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Polyelectrolytes as adhesion modifiers.
Adsorbed layers of polyelectrolytes have been studied with atomic force microscopy (AFM) and the interferometric surface force apparatus (SFA). Particular emphasis was put on determining the effect of the polyelectrolyte charge density on surface topography, and the effect of the polyelectrolyte coating on the adhesive properties. The AFM was employed to image individual polymer chains at low a...
متن کاملThe Effect of Salt Concentration on Adsorption of Low-Charge-Density Polyelectrolytes and Interactions between Polyelectrolyte-Coated Surfaces.
In this investigation surface force, X-ray photoelectron spectroscopy and ellipsometry techniques have been used to study the adsorption of a low-charge-density cationic polyelectrolyte on negatively charged surfaces. It is shown that the low cationicity of this polyelectrolyte induces an adsorption behavior which is limited by steric factors rather than by the substrate surface charge or poten...
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Both proteins and polysaccharides are biopolymers present on a bacterial surface that can simultaneously affect bacterial adhesion. To better understand how the combined presence of proteins and polysaccharides might influence bacterial attachment, adhesion forces were examined using atomic force microscopy (AFM) between colloids (COOH- or protein-coated) and polymer-coated surfaces (BSA, lysoz...
متن کاملAdsorption of polyelectrolytes and inter-colloidal forces
The e ect of charged polymers on the interactions between charged surfaces in solution is investigated theoretically. We use meaneld theory to derive a self-consistent eld equation for the polymer order parameter, and a modi ed Poisson–Boltzmann equation for the electrostatic potential. The two di erential equations together with the appropriate boundary conditions are solved numerically. We us...
متن کاملConformations and interactions of star-branched polyelectrolytes.
Combining monomer-resolved molecular dynamics simulations with a theory based on a variational free energy, we calculate the conformational properties and the effective interactions of star-branched polyelectrolytes for a large variety of arm numbers, degrees of polymerization, and charge fractions, with and without added salt. We find quantitative agreement between theory and simulation and pu...
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تاریخ انتشار 2006