Influence of PEG-12 Dimethicone addition on stability and formation of emulsions containing liquid crystal.
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Data
2007
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Resumo
Oil/water emulsions, containing liquid crystals,
were developed employing Andiroba oil, PEG-12
Dimethicone and Crodafos CES . It was evaluated
the influence of silicone surfactants on the emulsions
stability and on the formation of liquid crystalline
phases and therefore, physicochemical
characteristics, such as rheology and zeta potential,
were evaluated. Emulsions were prepared by
the emulsions phase inversion method. All the formulations
presented lamellar liquid crystalline
phases. The PEG-12 Dimethicone addition did not
change microscopically the liquid crystalline
phases. The emulsions containing silicone demonstrated
lower viscosity than those without the
additive. This is an important feature, as the silicone
did not change the rheological profile; however,
the addition of silicone still can be used as a
viscosity controller. The formulations had their
viscosity increased 15 and 150 days after their
preparation. This characteristic shows that the
emulsions have their organization increased along
the storing time. In the analysis of zeta potential,
we could verify that all formulations presented
negative values between )39.7 and )70.0 mV.
Within this range of values, the emulsion physical
stability is high (Fig. 10). It was concluded that
the addition of PEG-12 Dimethicone kept the liquid
crystalline phase of the emulsion obtained with
Crodafos CES , influencing in a positive way in
the system stability.
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Andiroba oil, Cosmetics, Rheology, Zeta potential
Citação
ANDRADE, F. F. de et al. Influence of PEG-12 Dimethicone addition on stability and formation of emulsions containing liquid crystal. International Journal of Cosmetic Science, v. 29, p. 211-218, 2007. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1111/j.1467-2494.2007.00374.x/abstract>. Acesso em: 10 jan. 2017.