TESTING 21 n Sample 1 n Sample 2 n Sample 3 n Sample 4 n Sample 5 10
were discovered. The presence of 10 nm particles along with particles in the micron size range support the presence of micelles as well as possible aggregates or other species.
1 0.1 1 Figure 5: Complex viscosity overlay. An 820 nm diameter latex standard
(Spherotech) was added to each sample as the probe particle. Three measurements were made for each sample. Figure 5 shows an overlay of complex viscosity for one measurement of each sample. The shape of the curve for all samples indicates shear thinning. It also supports its non- Newtonian behaviour. This quality may be useful for micellar water since its method includes using force while wiping the face.
Across all formulations, there are minor differences in complex viscosity. These data suggest the ability of dynamic light scattering measurements to characterise viscoelastic properties across formulations.
Conclusion By performing particle size, zeta potential, and microrheological analyses, clear similarities and differences among commercial micellar water formulations
100 w(rad/s) 10000 1000000
These size populations were easily characterised by DLS and could be useful in quality control and formulation to identify what populations are supposed to be present and what should be removed. The presence of charge differences, observed with PALS, could be useful in stability and efficacy characterisation based on the expectations of the manufacturer. Consistent batch-to-batch stability could also easily be qualified with this method. The microrheological data could be used in addition to all of these methods for further qualification of formulas from batch-to- batch. Complex viscosity and other properties could play a role in the ease of application of the micellar water. Based on this preliminary study, future work can be done to fully understand the valuable role light scattering can have for this product and industry.
PC
References 1
labmuffin.com/fact-checkwhat-is-micellar- water-and-how-does-it-work-an-update/
2 Carli B. Creating Micellar Water. Institute of Personal Care Science, 28 June 2017,
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Complex Viscosity, n* (mPa•s)
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