Functions of Cationic Surfactant - Solubilization
Solubilization refers to the effect of the surfactant on increasing the solubility of poorly soluble or insoluble materials in water. For example, the solubility of benzene in water is 0.09% (volume fraction). If a surfactant (such as sodium oleate) is added, the solubility of benzene can be increased to 10%.
Solubilization is inseparable from the micelles formed by the surfactant in water. The micelles are micelles formed by the hydrocarbon chains in the surfactant molecules that are brought together in an aqueous solution due to hydrophobic interaction. The inside of the micelle is actually a liquid hydrocarbon, so non-polar organic solutes that are insoluble in water such as benzene and mineral oil are more soluble in the micelle. Solubilization is a process in which micelles dissolve the lipophilic substances and is a special effect of the surfactant. Therefore, only when the concentration of the surfactant in the solution is above the critical micelle concentration, there are more large micelles in the solution. Solubilization is only present, and the larger the micelle volume, the greater the amount of solubilization.
Different from solubilization and emulsification, emulsification is a discontinuous, unstable multiphase system obtained by dispersing a liquid phase into water (or another liquid phase). On the contrast, the solubilization results in a single-phase homogeneous stable system in which the solubilizing solution is in the same phase as the solubilized material. Sometimes the same surfactant has both emulsification and solubilization, but it only has a solubilization when its concentration is above the critical micelle concentration.
- January 25, 2019An amphoteric surfactant refers to a surfactant having both an anionic and a cationic hydrophilic group, and thus the surfactant is cationic in an acidic solution, anionic in an alkaline solution, and...view
- January 25, 2019The main varieties of nonionic surfactants are alkyl alcohol amide (FFA), fatty alcohol polyoxyethylene ether (AE), alkyl phenol ethoxylate (APE or OP). Nonionic surfactants have good solubilization, ...view
- December 17, 2018The development direction of surfactant will be demonstrated in the following: 1. it turns to be natural; 2. it will replace harmful chemicals, 3. it will be washed to put into use at room temperature...view
- November 15, 2018test test test test test test test test test test test test test test test test test test test test test test test test test test testview
- January 25, 2019Based on different functions, the surfactant used in coating industry can be classified as following:Emulsifier,surface treatment agent, wetting dispersant of pigment, defoamer, flatting agent, mould ...view
- January 25, 2019Quaternay ammonium salt bactericide, which has the property of ionic compound, is easy to dissolve in the water while it is hard to behave in the same way in the non-polar solvent, being stable in che...view