ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Time dependence wettability of quartz with water

B. Jańczuk, E. Chibowski, and T. Bialopiotrowicz

Department of Physical Chemistry, Institute of Chemistry, M. Curie-Sktodowska University, PL-20-031 Lublin

Abstract: Contact angles as a function of time were measured in two systems: "dry" quartz glass plate—water droplet—saturated water vapour and wetted in excess with water quartz plate—water droplet—air "dried" with molecular sieve. In both the cases contact angles increased from zero to 52°—54° in the period of time equal to 30 min. However, if the "dry" plate was exposed to the water vapour for 24 h the contact angle decreased to 24°. To explain the observed contact angles models of the interfaces of the quartz—water—air system were proposed. Using GGFY equations contact angles were calculated as a function of the water film decrease of surface density of Gibbs energy of quartz behind and under a water droplet. The experimental values of the contact angle fit into the calculated ranges of the contact angle changes.

Full paper in Portable Document Format: 403a349.pdf

Chemical Papers 40 (3) 349–356 (1986)