Abstract
With use of response surface methodology (RSM), the W1/O/W2 emulsions containing ferrous sulfate as the inner phase were optimized in terms of stability (ES) and apparent viscosity (μ app ). Curvature display of the responses around their optimal settings was appropriately described using the quadratic polynomial regression model. The non-Newtonian behavior of the test W1/O/W2 emulsions was characterized using the power-law model and change from non-Newtonian to Newtonian (n≃1) was seen in the case of W1/O:W2 ratio equal 20: 80 when the level of Tween-80 was 1 v%. Results of the size distribution pattern showed 60% of the particles were less than 5 μm. Rheological properties of the test W1/O/W2 emulsions as the viscoelastic liquids were analyzed and the results of oscillatory experiments considering shear stress and frequency dependency of G′ and G″ moduli were discussed in terms of the internal microstructure of the emulsions.
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