Interfacial & Surface Tension Testing Services

We provide a fast-turnaround surface tension testing and wetting analysis service for your samples.

surface tension testing and wetting analysis service for Interfacial Tension, Surface Tension Testing Services page

We can provide measurements of surface tension and hydrophobicity or hydrophilicity of a surface or liquid as a function of time and/or temperature. On completion of our testing you will receive a full written report with graphical and numerical results and explanatory notes.

We are an expert measurement lab and any support you may need from us regarding the relevence, interpretation or application of the results we provide is all included in the initial cost of the testing.

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Surface tension measurements for wetting properties

From simple measurements of equilibrated surface tension, to more complex time dependent or temperature dependent relationships, we have a host of accessories which enable us to tightly control the conditions of measurement for your sample. For short time-scale processes we can observe up to a resolution of 5ms.

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Pendant Drop Analysis

Pendant drop analysis measures the shape of a liquid drop suspended from the end of a tube in air or a lower density liquid. The shape of the hanging drop of liquid is the result of the competing forces of gravity, trying to pull the drop into a pear shape, and surface tension, trying to maintain a sphere. By analysis of the resulting drop shape surface tension and interfacial tension can be calculated. We can also measure how long it takes for the surface to reach an equilibrium after having just been been formed which indicates how quickly surface actives stabilise newly formed surface.

Interfacial Rheology Measurement

Interfacial rheology is an exciting and relatively new technique that enables the characterisation of viscoelastic properties of an interface such as modulus and stress relaxation. These properties arise from the time-dependent interchange of surface active entities between the bulk solution and the interface. As interface is created surfactants take a finite time to adsorb to an equilibrium condition; if the interface is then compressed those surfactants are then forced back into the solution.
By oscillating the size of a pendant drop and measuring the interfacial tension throughout it is possible to characterise these processes. This method is known as dilatational interfacial rheology.

Oscillating pendant drop shape analysis for Interfacial Tension, Surface Tension Testing Services

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