Rheological Properties of Sodium Dodecyl Sulphate-based Supramolecules Hydrogel Induced by Aluminum Ion

Surfactant hydrogels were prepared composed of sodium dodecyl sulphate(SDS) /Al(NO3)(3)/H2O systmes. Steady and oscillatory shear experiments were carried out to evaluate the inner structure of the gel with variable Al(NO3)(3) concentration at a fixed SDS 20wt% composition in gel region. The results indicated that hydrogels showed shear-induced thinning nonlinear rheology behaviors. Phase transition was measured by differential scanning calorimetry and the transition temperature(T-gel) increased with aluminum salt concentration increasing. It is in conformity with electron micrograph of microstructures from spherical, short rod-like to larger cylindrical micelles. Littler salt change resulted in larger micelles transition derived from supramolecule structure of SDS and Al3+.