Real-Time Analysis of Phase Inversion Behavior in O/W Cleansing Creams Using Rheo-Impedance
In this report, the phase inversion behavior of a commercial cleansing cream was analyzed in real time using Rheo-Impedance, which combines rheological and electrical impedance measurements, together with Rheo-SALS based on small-angle light scattering measurements.
O/W (Oil in water) cleansing creams are known to undergo phase inversion to W/O (Water in oil) systems during use due to applied shear and water evaporation, resulting in significant changes in sensory feel. However, quantitative real-time evaluation of this dynamic phase inversion behavior has been difficult using conventional methods. In this report, the phase inversion behavior of a commercial cleansing cream was analyzed in real time using Rheo-Impedance, which combines rheological and electrical impedance measurements, together with Rheo-SALS based on small-angle light scattering measurements. By applying a newly developed “phase inversion mode” involving repeated shear application and drying processes, viscosity changes corresponding to sensory feel could be successfully reproduced. Furthermore, impedance characteristics and SALS scattering images clearly demonstrated the progression of phase inversion from O/W to W/O structures. These results indicate that the present method is an effective analytical technique capable of correlating sensory feel with internal structural evolution in real time.
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