title: Improved inverted bubble method for measuring small contact angles at crystal-solution-vapor interfaces.
abstract: We propose and evaluate an improvement of the inverted bubble method, originally proposed by McLachlan and Cox [Rev. Sci. Instrum. 46, 80 (1975)], a technique for measuring small contact angles at crystal-solution-vapor interfaces on a gas bubble under a solid immersed in a test solution. A simple experimental setup is used to evaluate the proposed method. We conclude that the method is suitable for measuring small contact angles with a minimum detectable angle of about 3 degrees . Improvements in instrument design are proposed to lower the detection limit to 0.5 degrees or below.
authors: Institute for Atmospheric and Clomate Science, ETH Zurich, Switzerland. thierry.corti@env.ethz.ch
authors: Thierry
authors: T
authors: Corti
authors: Ulrich K
authors: UK
authors: Krieger