Abstract
Ultra-small-angle neutron scattering (USANS) experiments on one- and two-component aqueous colloidal dispersions were carried out at the Bonse-Hart double crystal diffractometers installed at the High Flux Isotope Reactor (Oak Ridge, TN) and at the JRR-3M reactor (Tokai, Japan). The USANS curves from low-concentration suspensions of hydrogenated poly(methyl methacrylate) (h-PMMA) latices in D 2 O show scattering patterns typical for isolated solid spheres, which change dramatically after adding the ion-exchange resin to remove ionic impurities. This additive significantly enhances electrostatic interaction between particles, and thus the diffraction pattern from 2.5% h-PMMA latices in D 2 O + ion-exchange resin corresponds to a colloidal crystal with the fcc structure. The USANS from hydrogenated and deuterated component of the colloidal alloy ofh- and d-polystyrene (h-PS and d-PS) latices was measured separately by matching the scattering length density of h-PS and d-PS particles in H 2 O/D 2 O mixture. It was found that the minority component of large diameter latices were randomly distributed in the alloy dispersion, whereas the majority component of small diameter particles formed colloidal crystals.
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