Contact Angle with 3D Topography Measurements

The  Theta Topography is an add-on module for the Theta Optical Tensiometer.  It is an innovative system capable of separating the effect of surface roughness to the contact angle result. As a result, roughness-corrected contact angles can be better compared with each other for research and quality control purposes.

Features & Benefits

    • Integrated method enabling to define contact angle and surface roughness accurately from the same location and to combine both surface chemical and topographical data with automated software calculations.
    • Offers fast surface characterisation method, which does not demand specialist to run the samples.
    • Versatile roughness measurement: both 2D and 3D characterization..


Many surface modification and coating technologies that are used for optimizing wetting and adhesion properties influence both surface chemistry and roughness. Understanding the mechanisms that impact wetting by separating these two factors can be a useful tool in product development processes and in quality control. Roughness correction on contact angles also enables the calculation of fundamental surface free energy on rough surfaces. Theta Topography can be used for studying microscale roughness, which is relevant in many applications and processes. Examples include:

      • Coatings and surface modifications
      • Paper and board wettability
      • Biocompatibility of implants
      • Construction and building material

Wettability is typically studied by a contact angle measurement that can be defined with the well-known Young equation on ideal surfaces. Surface free energy theories are also based on assumptions that Young contact angles are used for calculations. Thus, the surface is assumed to be chemically homogenous and topographically smooth. This is, however, not true in the case of real surfaces. It is well established that surface roughness enhances the existing wetting behaviour and influence on adhesion.

For Technical Information and further details on the Theta Product Range and the Theta Topography Module please click on the product datasheets below.

  Theory Note 7 Influence of Surface Roughness on Contact Angle & Wettability

 3D Topography Module

Brochure Attension_Theta_Optical Tensiometers

Theta Accessories Brochure