Flow characteristics of jojoba and other oil blends for skin treatment fluids

Abstract

In this study, the flow properties of jojoba oil and other skin fluids, such as olive oil, castor oil, and glycerin, were assessed experimentally to address the behavior of jojoba oil compared to other commonly used skin fluids. Jojoba, olive, and castor oil as well as glycerin were investigated for density and kinematic viscosity using the Anton Paar Stabinger viscometer of SVM 3000, and rheological characteristics were examined using the MCR92 rotational rheometer, respectively. The density values reported in this study were in the range of 0.868–0.830, 0.966–0.922, and 0.920–0.877 g/cm3 for jojoba, castor, and olive oils, respectively. In comparison, glycerin exhibited the highest density value in the range of 1.267–1.226 g/cm3 over the temperature range of 10 °C–75 °C. The kinematic viscosity of the tested oils deteriorated steadily over the assigned temperature range of 10 °C–75 °C. The power law model can be used to predict the flow behavior of the tested skin fluids over the tested temperature range. The examined skin fluids exhibited nearly Newtonian flow behavior for most of the applied shear rates and temperatures and demonstrated only a viscous response without elastic involvement. This study revealed similar flow profiles for jojoba and olive oils on one side, while the castor and glycerin are almost comparable on the other.

Keywords

• Skin oils
• Jojoba oil
• Viscosity
• Complex modulus
• Viscous and elastic moduli