Abstract
Drainage of solutions of silver (Ag) nano-clusters, pressed between the two apexes of a double-concaved drop situated in a capillary holder, was studied. The size of clusters was below 2 nm. The aqueous nano-suspension of Ag nano-clusters was stabilized by poly(methacrylic acid) (PMAA). The two tips of the double-concaved drop were pressed by a capillary pressure thus forming a foam nanofilm, the drainage kinetics of which was monitored by interferometry. For comparison, the drainage of foam films containing PMAA aqueous solutions with and without AgNO 3 was monitored as well. It was found that steric repulsion occurred between the two film surfaces due to the polymeric chains of PMAA. In addition, we observed also a significant change of this steric repulsion in nano-cluster suspensions, which is explained by changes of the polymer network in the film, affecting the entire drainage and stability of the suspension.
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