Novel O/W Emulsions by Utilizing a Vesicle/Disc Transformation of Polyether Modified Silicone

Area of Science:

• Colloid and Surface Science
• Materials Science
• Cosmetic Science

Background:

• Emulsification is crucial for cosmetics and household products, but stability is challenged by non-equilibrium states and complex oil properties.
• Industrial applications often rely on empirical rules due to the numerous variables in emulsification research.
• Investigating emulsions with lamellar liquid crystalline phases offers a path to improved stability and predictable formulation.

Purpose of the Study:

• To investigate oil-in-water (O/W) emulsions utilizing a lamellar liquid crystalline phase at the interface.
• To understand the role of ternary phase equilibrium in forming stable emulsions.
• To clarify the emulsification properties of polyether-modified silicones with various oils.

Main Methods:

• Formation of O/W emulsions by agitating an aqueous phase with dispersed emulsifier vesicles and an oil phase.
• Analysis of emulsion stability and interfacial membrane structure using freeze-fracture transmission electron microscopy.
• Particle size analysis to calculate interfacial membrane thickness.
• Evaluation of emulsifier performance with polar and silicone oils of varying compatibility.

Main Results:

• A method was developed to obtain emulsions with a uniform lamellar liquid crystalline interfacial membrane.
• The prepared emulsions demonstrated significant stability against coalescence.
• The transformation process from vesicles to a liquid crystalline membrane was elucidated.
• Emulsification properties of polyether-modified silicones were clarified based on oil compatibility.

Conclusions:

• Stable O/W emulsions can be achieved using polyether-modified silicones and a lamellar liquid crystalline interfacial phase.
• This research provides a scientific basis for optimizing emulsion formulation, moving beyond empirical rules.
• The findings are expected to drive innovation in cosmetics, household products, food, pharmaceuticals, and paint industries.