Non-ionic Surfactants | Multiparameter Analysis - Viscosity, Cloud Point and Refractive Index
Cloud point, dynamic viscosity, density, refractive index – all these important parameters can be quickly, easily and reliably determined by using SVM 3001 Cold Properties combined with an Abbemat refractometer.
Non-ionic surfactants are widely used in various products of our daily life. Application fields are agrochemistry, pharma, cosmetics, textile industry and many more. The surfactants act as wetting agent, emulsifier, dispersant and other.
Which parameters are determined?
Cloud Point
The cloud point is one of the most important parameters to be determined for non-ionic surfactants. These substances perform most effectively if they are used at temperatures close to or at their cloud points. By adding substances such as ionic surfactants and/or electrolytes, the cloud point of the solution can be raised or lowered to suit a specific application.
In addition, the cloud point is essential to determine the storage stability. Too high storing temperatures can lead to phase separation.
The cloud point corresponds to the temperature at which the solution becomes turbid when heated. This is the temperature at which the surfactant is no longer completely soluble in water and separates as a second phase.
Typically, the cloud point is measured from a 1 % solution in water.
Other parameters
Further important parameters are
- Refractive index – typically measured at 20 °C, sometimes at 25 °C
- Dynamic viscosity at 25 °C
- Density / relative density – typically measured at 20 °C or 25 °C.
These parameters are measured from the pure (undiluted) substance.
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