Dynamic Contact Angle Measurements

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Video Transcript for Dynamic Contact Angle Measurements:

Dynamic contact angle measurement is the term given to the quantification of advancing and receding contact angle. The advancing contact angle is associated with wetting fresh, previously un-wetted surfaces.

The receding contact angle is associated with the wetting of a previously wetted surface, as the liquid front recedes. The roll-off angle is the inclination of a surface, at which a droplet rolls off subject to several different factors including surface properties of the solid and liquid, rate of tilt and volume of droplet.

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Powder rheology and flow testing methods can provide a range of insights into predicting whether a powder will cake, flow, crumble, bridge/arch or rathole. While simple test methods such as angle of repose can provide a quick measurement, they lack significant detail and sensitivity to fully describe how a powder will behave in different scenarios.

Temperature, humidity, applied external stresses, static charge, particle geometry and physical dimensions can all play a role in the final observed bulk powder handling behaviour, sometimes with unexpected results.

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