• Optical Methods

    DataPhysics Video Based Contact Angle and Interfacial Tension Analysis (OCA line)

    The extent to which a liquid will 'wet' a solid with which it comes into contact, is key to the success or failure of a huge range of engineering applications. The ease with which a liquid will move over a surface and the stability of the 'new' solid/liquid interface can be derived from the measurement of contact angle (liquid on solid), through surface free energy (of solid substrate) and onto work of adhesion.

    Important industry sectors to which this technology is applicable are: Paints, inks, varnishes, adhesives, composite materials, and ensuring the biocompatibility of medical devices.

    The basic OCA frame provides a platform for the construction of the required system from an extensive range of specialised components.

    1. Camera and lens, for formation of clear image (single image or video).
    2. Sample positioning and temperature/environmental control.
    3. Drop delivery system.

    The modular design philosophy and the number of options available, at each point of the instrument construction, provides for an almost infinite number of combinations of hardware.

    The DataPhysics systems OCA15 EC through to OCA20 allow for the automation of the liquid drop delivery (from up to FOUR software controlled syringe drive systems) and temperature/environmental control of the test area, but require manual placement of the sample within the field of view of any of the available camera technologies.

    The 'systems' OCA30 through to OCA50 micro are examples of systems that allow for the automation of the liquid drop delivery (from up to SIX software controlled syringe drive systems), temperature/environmental control of the test area, AND the automation of the placement of the sample (x, y, z axis) within the field of view of any of the available camera technologies.

    The automation of the sample positioning allows for the pre-programming of entire evaluation routines such as 'surface mapping' of electronic wafers and the 'micro' ability of the OCA50 drop delivery and imaging system allows for the study of drops on single fibres and specific areas of electronic components.

    All devices are supported by bespoke and stable software, designed with the same modularity in mind:

    1. Instrument control
    2. Contact angle and surface free energy determination
    3. Surface and IFT from pendant drop evaluation
    4. Surface and ITF from the evaluation of the lamella contour
    5. Static and dynamic contact angle on single fibres
    6. Oscillation and relaxation of pendant drops