This article is cited in 5 papers

The effect of topographic defects on the superhydrophobic properties of coatings based on ZnO

A. È. Muslimov^a, A. Sh. Asvarov^ab, N. S. Shabanov^c, V. M. Kanevskii<sup>a

a</sup> FSRC "Crystallography and Photonics" RAS
^b Daghestan Institute of Physics after Amirkhanov
^c Daghestan Scientific Centre of Russian Academy of Sciences, Makhachkala

Abstract: The results of a study of the hydrophobic properties of a ZnO coating with different morphologies of the surface are presented. It is shown that the Wenzel state is implemented for the case of samples of ZnO with nanoscale surface roughness, while the Cassie state is implemented for microstructured samples. A superhydrophobic state with a contact angle of 151$^\circ$ and work of adhesion of 8.82 mJ/m$^2$ is achieved for a sample with multimodal surface roughness. It is demonstrated that the presence of microscale defects on the surface of the superhydrophobic samples leads to the instability of the Cassie state, while the Cassie–Wenzel transition is fulfilled in the case of increasing the radius of water drops.

Keywords: zinc oxide, superhydrophobic, Cassie–Wenzel transition.

Received: 08.05.2020
Revised: 18.05.2020
Accepted: 27.06.2020

DOI: 10.21883/PJTF.2020.19.50037.18371

 English version: Technical Physics Letters, 2020, 46:10, 954–957

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