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    Contact Angle (4)

    < 6 min

    Capillary action – how contact angle and surface tension are related?

    Capillary action, also called capillary filling or wicking, means the spontaneous flow of liquid to fill small capillaries or pores.

    < 3 min

    Contact angle measurements to evaluate plasma treatment efficiency

    Plasma treatment is an often-used process prior to coating, printing or gluing to improve the wettability of the material.

    ~ 3 min

    How to study the wettability of the contact lens?

    Contact lens should support a continuous tear film for optimum visual clarity. It should also resist the sorption of tear components as deposition can lead to decreased visual clarity and discomfort. Wettability of the surface affects both the tear film as well as biocompatibility of the lens.

    ~ 3 min

    What is wettability?

    Wettability is the preference of a liquid to be in contact with a solid surrounded by another fluid (liquid or gas). Depending on the application, wettability can be wanted or not.

    > 2 min

    Why is contact angle important?

    In industry, wettability is important for example when manufacturing electronics or when planning how to extract oil from the oil reservoir. In all these applications, knowing the contact angle value gives a strong indication on the performance of the product or a successfulness of the process.

    ~ 2 min

    What is contact angle?

    Contact angle is easy to understand visually. It is the angle a droplet forms in contact with a solid surface. Thermodynamically, it is a balance between different forces acting on a three-phase contact point where solid, liquid and air meet.

    ~ 3 min

    Wettability of superhydrophobic surfaces - Contact angle, friction and adhesion

    With increasing understanding of the superhydrophobicity, the measurement methods to quantify the degree of hydrophobicity deserve some thought.

    < 4 min

    How To Measure Surface Free Energy?

    Calculate critical surface tension or surface free energy for a solid by testing against a series of liquids and measuring the contact angles.

    < 2 min

    How to measure dynamic contact angles on superhydrophobic surfaces

    This video will explain two main methods for measuring dynamic contact angle.

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