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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Focus: Wetting on smooth and rough surfaces: From spreading to superhydrophobicity I
CPP 22.11: Vortrag
Mittwoch, 13. März 2013, 12:45–13:00, H34
Design of the self-repairable materials using colloidal particles — •Nikolay Puretskiy1,2, Georgi Stoychev1,2, Alla Synytska1, and Leonid Ionov1 — 1Leibniz-IPF Dresden, 01069 Dresden, Germany — 2TU Dresden, 01062 Dresden, Germany
We suggest an approach for the design of materials with self-repairable switchable and hydrophobic properties. The approach is based on use of colloidal particles located on a surface of hydrophobic oil. Due to surface forces, the colloidal particles segregate at the wax surface after melting and change its wetting properties. Since the degree of particle immersion in the wax depends on the environment (hydrophilic or hydrophobic), the roughness, as well as the wetting properties of the particle-wax composite surface, can be switched. The obtained morphology can be "frozen" by cooling down below oil melting point [1]. Notably, since the colloidal particles are homogeneously distributed in the wax bulk, removal of the topmost particle-wax layer does not result in disappear of switchable properties. After remelting the particles segregate again at newly formed surface and switchable properties are recovered. The similar approach is used for the design of materials with self-repairable ultrahydrophobic properties. The materials are based on perfuorinated decane with incorporated colloidal particles. Due to the highly pronounced tendency of this perfuorinated decane to crystallize, the formation of blends with rough fractal surfaces was observed [2]. [1] N. Puretskiy, G. Stoychev, M. Stamm and L. Ionov; ACS Applied Materials and Interfaces, 2010, 2, 2944-2948 [2] N. Puretskiy, G. Stoychev, A. Synytska and L. Ionov; Langmuir, 2012, 28, 3679-3682