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| - Colloidal Stabilization by Adsorbed Gelatin
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| - The stabilizing effect of adsorbed polyampholyte on colloidal dispersions is quantified through smallangle neutron scattering measurements of the structure of concentrated dispersions. Gelatin is adsorbedonto colloidal acrylic latex particles of like net charge to provide both steric and electrostatic stabilization.The extent and structure of the adsorbed gelatin corona is measured using dynamic light scattering (DLS),small angle neutron scattering (SANS) and dilution viscometry (DV). The SANS spectra from concentrateddispersions of bare and gelatin-coated colloidal particles are modeled via integral equation theory usingpair potentials that superimpose an electric double layer and a simple model of steric repulsion, whereall the parameters are determined a priori. Our results demonstrate for the first time that the stabilizingforces arising from the adsorbed gelatin can be predicted quantitatively from a simple combination ofDerjaguin−Landau−Verwey−Overbeek (DLVO) theory and a model for the adsorbed polymer brush. Theseresults agree with previous studies of the surface forces of gelatin adsorbed onto mica cylinders and areimportant for understanding colloidal stabilization imparted by adsorbed polyampholytes.
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