Optical Tensiometers

Attension Theta is an advanced and versatile contact angle meter for highly accurate measurements of static and dynamic contact angle, 3D surface roughnesssurface free energy, surface and interfacial tension, and interfacial rheology.

Theta an automated optical tensiometer that measures static and dynamic contact angles, static and semi-dynamic surface/interfacial tension and surface free energy. The available drop profiles are: sessile drop, pendant drop, receding contact angle, tilting drop, advancing contact angle, captive bubble, meniscus and reverse pendant drop.

The unique monochromatic cold light source minimizes sample evaporation. A high resolution camera with x6.5 zoom lens extracts drop profiles with high accuracy.

The software enables analysis of drop shapes, including the Young-Laplace equation which is able to fit the entire drop profile. Theta can function fully automated with motorised stage and dispenser enabling the programming of drop locations on the substrate.

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Theta Lite the most cost-effective optical tensiometer with the same drop profiles as the Theta but with manual sample stage and liquid dispenser. It measures contact angles, surface free energy and drop volume. An extended software option increases measurements modes, data storage and data analysis capabilities.

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Theta High Pressure Chamber

This add-on module enables interfacial tension and contact angle measurements at high pressures and temperatures. The chamber includes a unique piston design which is especially useful in any studies including surfactants.

The system can be used in Enhanced Oil Recovery (EOR) to provide an accurate and quantitative measure of the wettability in oil reservoirs. It can also be used to understand the properties of Polymers, Supercritical fluids (SCF) and Supercritical CO2.

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3D Topography module

This new module combined with the Theta Optical tensiometer is the first product to provide 3D surface roughness with contact angle measurements and to perform those measurements on exactly the same sample location. The measurement takes only a few seconds and can be applied to a variety of surface modification and coating technologies such as surface finishing of building and construction materials, biocompatibility of implants and wettability of paper coatings.

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Picoliter dispenser

This additional module to the Theta Optical Tensiometer allows precision measurements with low volume drops as small as 20 pl. Picoliter dispensing is becoming increasingly important for the study of sorption phenomena in applications such as inkjet printing and printed electronics. In addition, the picoliter dispenser enables contact angle measurement of a picodrop deposited on single fiber.

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Automatic XYZ sample stage

Attension offers a fully automatic sample stage with improved resolution (0.01 mm). Drop samples can be placed at desired locations to test any location of one substrate. When combined with an automated dispenser and motorized vertical liquid dispenser motion, fully software controlled measurements are possible. It is also possible to program deposition sequences along the X axis at desired intervals.

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Pulsating drop module for interfacial rheology

The pulsating drop module for Theta Optical Tensiometer functions by oscillating drops with complete control of both frequency and amplitude as well as wave shape (sine, triangle, square, etc.). This enables quick and easy interfacial rheology, providing viscoelasticity information for surfactant applications.

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Measurement Video