Tensiometry: analysis of the surface and interfacial tension of liquids
Measure surface tension and fluid interaction using tensiometry
Tensiometry is an analytical technique used to measure the surface tension and interfacial tension of liquids. These parameters are essential for characterizing the physicochemical properties of liquid formulations, particularly in the chemical, cosmetics, food and beverage, and materials industries .
Thanks to tensiometry , it is possible to evaluate the wettability, adhesion and stability of formulations, thus facilitating the development of products optimized for their industrial applications.
How does tensiometry work?
Tensiometry relies on measuring the forces acting at the interface between a liquid and another medium (gas, solid, or liquid). Several methods are used to determine these forces accurately :
- Wilhelmy plate method – A plate immersed in the liquid experiences a force proportional to the surface tension, allowing a direct measurement.
- Du Noüy ring method – A metal ring is immersed and then removed from the liquid, and the force required to break the meniscus is measured.
- Hanging droplet and sessile droplet – Analyzing the shape of a droplet allows us to assess interfacial tension and the contact angle on a solid surface.
- Droplet equilibrium-based methods – Used to measure the adsorption dynamics of surfactants and other molecules on surfaces.
These techniques make it possible to study the behavior of fluids under real conditions and to optimize the formulation of industrial products.
Technical characteristics of tensiometry
Tensiometry is distinguished by its ability to provide precise measurements adapted to various industrial needs :
- Measurement range : generally between 0.01 mN/m and 1000 mN/m depending on the method used.
- Accuracy : up to 0.01 mN/m for the highest performing instruments.
- Available methods :
- Static tensiometry : measurement of surface tension at equilibrium.
- Dynamic tensiometry : analysis of the evolution of tension over time.
- Contact angle methods : determination of wettability on solid surfaces.
- Compatibility with various fluids : aqueous liquids, oils, organic solvents and emulsions.
- Control of experimental conditions : temperature, humidity and concentration of solutions.
Tensiometry is often coupled with other analytical techniques for a thorough characterization of interfaces.
For which matrices is tensiometry suitable?
Tensiometry is applicable to a wide range of liquid samples and interfaces:
Main industrial applications of tensiometry
Tensiometry in many sectors to optimize product formulation and performance:
By providing essential data on the interaction between liquids and surfaces, tensiometry makes it possible to optimize formulation and improve product performance.
Léa Géréec
Technical and scientific expert
