Superhydrophobic surfaces are gaining more and more attention as new applications for them arises. For surface to be superhydrophobic, it has to fulfil two requirements. The static contact angle has to be over 150 degrees but in addition to that, the surface has to have a low contact angle hysteresis. For this reason, measurement of dynamic contact angles is especially important when superhydrophobic surfaces are studied.
There are two main methods for dynamic contact angle measurement; tilting cradle and a so-called needle method. Tilting cradle is fairly often used for dynamic contact angle measurements but can be troublesome for superhydrophobic surfaces. Placing the drop on superhydrophobic surface is somewhat difficult as the drop would prefer to stay in the needle. Also the drop rolls off the image very easily as the contact angle hysteresis is low. For these reasons most of the people prefer the needle method where needle is left in contact with the drop.
Watch the short webinar through the link below to see how contact angle measurements can be done in practice on superhydrophobic surfaces.
This blog post discusses the importance of adhesion in the lithography process and how to predict adhesion with contact angle measurements.
HMDS is used to render the surface of silicon more hydrophobic and thus to match better with the chemistry of the photoresist.
This blog post explains the concept of RCA cleaning and it's relation to contact angle.
Contact angle measurements can be used to evaluate the cleanliness of silicon wafers.
Attension Theta Wafer offers an optical tensiometer for fully automated mapping of up to 12-inch wafers.
Standard contact angle measurement considers the surface's chemical properties. The influence of surface roughness is added by utilizing the Wenzel equation.
Fiber contact angles can be measured with several different methods
Characterization of superhydrophilic surfaces is commonly done with contact angle measurements.
Contact angle provides insights into the wettability and adhesion properties of cosmetic ingredients and formulations.