engleski

Effect of Anionic Surfactants on Crystal Growth of Calcium Hydrogen Phosphate Dihydrate

The effect of anionic surfactants: single chained sodium dodecyl sulfate (SDS), asymmetric double chained sodium bis(2-ethylhexyl) sulfosuccinate (AOT), and two-headed, disodium oleoamido PEG-2 sulfosuccinate (PEG) on crystallization process of calcium hydrogenphosphate dihydrate (DCPD) was investigated. All surfactants, depending on the type and actual concentration, showed inhibitory effects on the overall crystallization process. Below the critical micelle concentration (cmc) electrostatic adsorption of surfactant anions on lateral crystal faces inhibited crystal growth and changed crystal morphology. Above the cmc SDS and AOT caused phase changes, i.e. a mixture of DCPD and octacalcium phosphate (OCP) was formed.

calcium hydrogen phosphate dihydrate; crystal growth; mechanisms of additive interactions

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