Abstract
The forces between negatively charged silica surfaces in the presence of a weak polyelectrolyte, poly (2-vinylpyridine), were measured as a function of polymer concentration, salt concentration, solution pH, and surface collision rates. The solubility of the polymer is highly dependent on the solution pH; that is, when the molar concentration of solution protons is equivalent to the molar concentration of pyridine groups the polymer is >70% protonated and is highly soluble. As the pH increases, the degree of protonation decreases and the polymer becomes insoluble and precipitates from solution. At low polymer concentrations, low salt concentration, and a low pH, the polymer adsorbs strongly with an essentially flat conformation. The forces during compression are well described by DLVO (Derjaguin−Landau−Verwey−Overbeek) theory with no steric forces apparent. During decompression, the adhesive forces are much greater than those between the bare silica surfaces, indicating a strong bridging between the surfa...
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