Drop Shape Analyzer

DSA25E

From one-click wettability measurement to analysis of solid-liquid adhesion

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In its Expert configuration, the DSA25 Drop Shape Analyzer is designed for determining the wettability of solids by means of the contact angle as well as the surface tension of liquids such as coating substances or adhesives. Thanks to the combination of speed and versatile evaluation options, the analyses give quick feedback to pretreatment steps in quality control but also allow assessing the resulting adhesion.

Applications

Quality assurance of activation processes such as plasma treatment, flame treatment, or corona treatment
Checking wettability of plastics, glass, ceramics, wood, paper, or metal
Testing the effectiveness of hydrophobic coatings and other coatings
Analyzing coating liquids and adhesives and assessing their adhesion
Assessing long-term stability of coatings
Analyzing (super-) hydrophobic and self-cleaning surfaces
Wetting analysis at controlled temperature and/or humidity

Measuring methods

Contact angle of a drop on a solid surface
Contact angles of two drops dosed in parallel
Contact angle using a gas bubble beneath a solid surface in a liquid
Roll-off behavior and advancing/receding contact angle of a drop on a tilted surface
Surface free energy of a solid using contact angle data
Surface or interfacial tension using the curvature of a drop or bubble at the tip of a needle
Surface tension using the curvature of a perfectly symmetrical drop on a circular sample pedestal
Calculating adhesion-related scientific parameters for the interfacial contact
Calculating the polar and disperse part of the surface tension from contact angle and surface tension data
Contact angle at an immersed, cylindrical sample, usually a fiber
Carrying out a measurement up to 20 consecutive times and displaying the results together
Measuring the recently receded contact angle to characterize dewetting behavior

Measuring results

Static contact angle
Advancing and receding contact angle
Contact angle using a bubble in a liquid
Roll-off angle
Surface free energy (SFE) according to the following models: Owens-Wendt-Rabel-Kaelble (OWRK), Fowkes, Wu, Zisman, Equation of State
Surface tension of a liquid and interfacial tension between two liquids
Work of adhesion, solid/liquid interfacial tension, spreading coefficient
Temperature

Liquid Needle dosing

Surface free energy in seconds

With the Liquid Needle, the contact angle measurement technology is perfectly prepared for quality assurance. Learn more about the ideas that enable the Liquid Needle to combine speed with scientific excellence.

Quick and versatile dosing for surface free energy and surface tension

The interaction between two software-controlled dosing units is the main advantage of the DSA25E. The Liquid Needle dosing technology performs rapid one-click measurements of the surface free energy (SFE) based on contact angles of two liquids. The additional syringe dosing unit can be used to add data for a third liquid to consolidate the SFE result or to measure the surface tension (SFT) of a liquid.

Reliable drop shape analysis thanks to high imaging quality

The DSA25E features a high-resolution camera and a quality zoom lens for accurate display of the drop with optimum size. The high image quality that this achieves leads to a precisely measured contact angle or SFT. Combined with the intelligent image evaluation algorithm of the ADVANCE software, drop shape analysis with the instrument provides exact results.

Maximum repeatability and comprehensive adhesion analysis

The ADVANCE software supports the Liquid Needle in order to carry out automated SFE measurements within a second. The easy-to-create automation programs can also be used to design a standard procedure for sample analysis to maximize repeatability of measurements. Optional software tools for data analysis combine SFE and SFT data in order to assess the adhesion and calculate other scientific parameters of the solid/liquid contact.

OPTIONAL

Tilting TaBLE

Characterize low wettability

The tilting table for the DSA25: Analyze (super-) hydrophobic and self-cleaning surfaces automatically by means of the contact angle and roll-off angle.

Intuitive software with a workflow-oriented user interface
Swift and repeatable analyses thanks to measurement templates and powerful automation functions
Superior algorithms for image analyses provide for precise results even with difficult images
A wide range of evaluation methods makes ADVANCE a reliable scientific tool