Silicone oil emulsions: strategies to improve their stability and applications in hair care products

Abstract

Synopsis Silicone oils have wide range of applications in personal care products due to their unique properties of high lubricity, non‐toxicity, excessive spreading and film formation. They are usually employed in the form of emulsions due to their inert nature. Until now, different conventional emulsification techniques have been developed and applied to prepare silicone oil emulsions. The size and uniformity of emulsions showed important influence on stability of droplets, which further affect the application performance. Therefore, various strategies were developed to improve the stability as well as application performance of silicone oil emulsions. In this review, we highlight different factors influencing the stability of silicone oil emulsions and explain various strategies to overcome the stability problems. In addition, the silicone deposition on the surface of hair substrates and different approaches to increase their deposition are also discussed in detail.

Evaluation of thiolated silicone oil as advanced mucoadhesive antifoaming agent

“…Droplets from diluted formulations containing unmodified silicone are not significantly different from systems containing thiomer (p40.05), although silicone-MPA is a gel unlike unmodified control (Partenhauser et al, 2015). This is in contrast to data gained for silicone oil emulsions, where the droplet size was increased with raising silicone oil viscosities (Nazir et al, 2014). Concerning the polydispersity index (PDI), no remarkable differences between lower and higher concentrated emulsions are evident.…”

Preparation, Surface Activities, and Biodegradability of a Bola‐Type Collagen Hydrolysate‐Based Siloxane Surfactant

“…Emulsifying ability, another important property of surfactants in applications, plays an important role in many fields, such as the cosmetics, pharmaceuticals, leather, and food industries (Nazir et al, ). Figure displays the EAI of CBES to polyether silicone oil, amino silicone oil, and soybean oil.…”

Novel amino acid‐based surfactant for silicone emulsification and its application in hair care products: a promising alternative to quaternary ammonium cationic surfactants

“…To achieve these goals, silicone must be sufficiently adsorbed by the hair surfaces. Silicone is usually emulsified in HCPs because of its low compatibility with hydrophilic and hydrophobic solvents . In this study, the amount of silicone adsorbed on the hair surfaces was measured after soaking the hair samples in the prepared emulsions.…”

“…where V R and V A are the electrostatic and van der Waals potentials, respectively. Equation (2) describes the interactions between the positively charged droplets and hair surfaces because hair surfaces are negatively charged at pH values higher than 4.0 [28]. Furthermore, the electrostatic potential is higher than the van der Waals potential on hair surfaces [29] due to the small Hamaker coefficient between silicone and keratin [30].…”