Abstract:

The influence of SDS and octaethylene glycol mono-n-hexadecyl ether (I) on the crystn. of Ca oxalate from 0.3 M NaCl solns. is discussed. Under the given exptl. conditions the thermodynamically stable monohydrate (II) was the predominant crystal form. SDS inhibited growth and aggregation of II and, by preferential adsorption at different crystal faces, induced different habit modifications. In addn, micellar solns. of SDS promoted crystn. of the metastable calcium oxalate dihydrate. I stimulated nucleation and/or initial crystal growth of II, most probably by providing active centers for heterogeneous nucleation. [on SciFinder(R)]