Abstract
We investigated the structure of colloidal crystals in binary colloidal dispersion by the ultra-small-angle neutron scattering (USANS) technique. The mixed dispersion of deutrated polystyrene latex ( d-PS) and hydrogenated polystyrene latex ( h-PS) dispersions (the size ratio α=0.54) was prepared for the USANS experiment to apply the contrast matching technique. The scattering from the each component could be detected separately. We also extracted the partial scattering intensity I dPS-hPS( q) at three mixing ratios. The USANS scattering profiles at the contrast matching point for each component were changed clearly with the change of the mixing ratio of d-PS and h-PS lattices. The I dPS-hPS( q) profile obtained for the d-PS number fraction x dPS03=0.39 indicated the correlation between d-PS and h-PS particles. These USANS observation suggested strongly the formation of the liquid-like colloidal alloy structure in the binary colloidal dispersion.
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