Platelets to rings: Influence of sodium dodecyl sulfate on Zn–Al layered double hydroxide morphology

In the current study, influence of sodium dodecyl sulfate (SDS) on the crystallization of Zn–Al layered double hydroxide (LDH) was investigated. Depending on the SDS concentration coral-like and for the first time ring-like morphologies were obtained in a urea-hydrolysis method. It was revealed that the surfactant level in the starting solution plays an important role in the morphology. Concentration of surfactant equal to or above the anion exchange capacity of the LDH is influential in creating different morphologies. Another important parameter was the critical micelle concentration (CMC) of the surfactant. Surfactant concentrations well above CMC value resulted in ring-like structures. The crystallization mechanism was discussed.

Dependence of ZnAl LDH Morphology on SDS concentration.Figure optionsDownload as PowerPoint slideHighlights
► In-situ intercalation of SDS in ZnAl LDH was achieved via urea hydrolysis method.
► Morphology of ZnAl LDH intercalated with SDS depended on the SDS concentration.
► Ring like morphology for SDS intercalated ZnAl LDH was obtained for the first time.
► Growth mechanism was discussed.
► Template assisted growth of ZnAl LDH was proposed.