Abstract
The crystal habits of SrSO 4 crystals grown from 0.015 M solution with and without the addition of polyvinyl sulfonate are compared. Pure strontium sulfate precipitate consists of single crystals, about some tens of microns long, with distinctly visible growth steps. Crystals grown with polyvinyl sulfonate in stirred solutions show a striking change of habit: they are sponge-like structures, composed of minute crystallites, of size in the nm range. The different modes of growth and the time-lag for precipitation in the presence of the polymer are explained by the stabilization of the critical nuclei of SrSO 4, possibly nucleating on the polymer molecules.
Published Version
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