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O: Fachverband Oberflächenphysik

O 26: Poster: New Methods

O 26.4: Poster

Monday, March 27, 2023, 18:00–20:00, P2/EG

Surface tension measurement of pure water in vacuum — •Paul T. P. Ryan, Jiri Pavelec, Jan Balajka, Michael Schmid, and Ulrike Diebold — Institute of Applied Physics, TU Wien, Austria

Very little is known about the surface tension of pure liquids in contact with their pure gaseous phases, i.e. without the presence of other gases or liquid phase contaminants. This is surprising given that contaminants are known to greatly affect surface tensions values[1]. Recently we have developed a method to dose liquid water onto pristine surfaces in UHV using a small cryostat[2]. We combine this approach with the pedant drop method[3] to measure the surface tension of ultra-clean liquids in contact with their pure gaseous phases. In the design, the ultra-clean liquid is condensed onto a small cryostat placed in a vacuum chamber. A pendant drop is formed and carefully photographed allowing the surface tension of the ultra-clean liquid to be directly determined. For these types of measurements accurate knowledge and control of the temperature, pressure and the optics of system is of paramount importance. How these parameters are precisely controlled in the instrument design will be discussed along with initial measurements of ultra-pure water. [1] Yuki Uematsu, et. al., Current Opinion in Electrochemistry, Volume 13, (2019) [2] Jan Balajka, et. al., Science, 361, (2018) [3] Berry, J. D. et. al., J. Coll. Interface Sci. 454, (2015).