Related Experiment Video
Updated: Jun 5, 2026
08:18
Self-Nanoemulsification of Healthy Oils to Enhance the Solubility of Lipophilic Drugs
Published on: July 27, 2022
Microemulsions from silicone oil with an anionic/nonionic surfactant mixture
Lukas Wolf1, Heinz Hoffmann, Kei Watanabe
1University of Bayreuth, BZKG/BayColl, Gottlieb-Keim-Str. 60, 95448 Bayreuth, Germany. lukas.wolf@frenet.de
Physical Chemistry Chemical Physics : PCCP
|January 6, 2011
Summary
This study details novel microemulsion phases using silicone oil and mixed surfactants. Unlike nonionic systems, these microemulsions show unconnected channels and lack bicontinuous structures at equal oil-water ratios.
Area of Science:
- Physical Chemistry
- Materials Science
- Colloid Science
Background:
- Microemulsions are thermodynamically stable isotropic liquid mixtures.
- Tuning microemulsion properties is crucial for various applications.
- Previous studies focused primarily on nonionic surfactant systems.
Purpose of the Study:
- To prepare and characterize novel microemulsion phases using silicone oil and mixed nonionic/ionic surfactants.
- To investigate the influence of surfactant mixing ratio on phase behavior and morphology.
- To compare the findings with existing knowledge of nonionic microemulsion systems.
Main Methods:
- Preparation of microemulsion phases using hexamethyldisiloxane (silicone oil), isotridecyltriethyleneglycolether (nonionic surfactant), and calciumdodecylsulfate (ionic surfactant).
- Phase diagram construction at constant temperature.
- Conductivity measurements to determine microemulsion morphology.
Main Results:
- Successful preparation of microemulsion phases with tunable hydrophilicity.
- Observation of two distinct single-phase channels (L(1), L(α), L(3)) within the phase diagram.
- Conductivity data revealed bicontinuous morphology in the upper channel (up to 40% oil) and oil-in-water droplets in the lower channel.
- Crucially, the two channels were found to be unconnected, and microemulsions with equal oil and water content did not exhibit bicontinuous structures.
Conclusions:
- The combination of silicone oil and mixed nonionic/ionic surfactants offers a new route to microemulsion formulation.
- The mixing ratio of surfactants significantly impacts phase behavior and morphology.
- The unconnected nature of the phase channels and the absence of bicontinuity at equal oil-water ratios represent a significant departure from nonionic systems.
Related Concept Videos
01:30Micelles
Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
01:27Surface Active Agents
Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
03:22Colloids
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...