Proper interpretation of different types of contact angle measurement methods has been a source of constant research and debate for decades.<b> </b>On the one hand comprehensive, detailed scientific guidelines have been established, but on the other hand there are numerous standards and technical data sheets that do not even specify the type of contact angle to be assessed. KRÜSS is the world market leader in contact-angle measurement equipment, and at our laboratories in Charlotte, Shanghai, and Hamburg we complete hundreds of contact angle measurement projects annually for industry, academic customers and internal projects. Based on this experience, I want to review both the fundamentally more correct ‘academic’ and the sometimes more pragmatic ‘industrial’ methods of contact angle measurement. I also want to touch on the question “does success in optimizing industrial processes via ‘wrong’ contact angles prove these methods still to be ‘right’? In addition, I will present high-speed recordings (~8.000 fps) of pendant drop and liquid-needle drop deposition processes and discuss these with respect to the effect of dynamic wetting pressure on the final contact angle. As an outlook and discussion point, I want to conclude with the currently still open key questions about contact angle measurements when used for industrial processes.

Which contact angle to measure? Status in academia and industry. An industry perspective.

Fall 2022 abstracts, posters, and presentations will launch in mid-September.

ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.