Development of superhydrophobic metallic surfaces with tuned morphology through microwave processing

The present study utilized microwave-based hydrothermal treatment to develop a durable superhydrophobic aluminium alloy (AA5083). The surface morphology was effectively tuned through modulation in processing temperatures with the transition from nanofibrils (NF) to densely networked flake-like (DNF)...

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Bibliographic Details
Published in:Materials chemistry and physics 2022-01, Vol.275, p.125310, Article 125310
Main Authors: Ivvala, Jayanth, Arora, H.S., Grewal, H.S.
Format: Article
Language:English
Subjects:
Adhesion
Aluminum base alloys
Functional
Hydrophobic surfaces
Hydrophobicity
Hydrothermal treatment
Hysteresis
Metals and alloys
Morphology
Nanostructures
Superhydrophobicity
Surfaces
Wetting
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Summary:The present study utilized microwave-based hydrothermal treatment to develop a durable superhydrophobic aluminium alloy (AA5083). The surface morphology was effectively tuned through modulation in processing temperatures with the transition from nanofibrils (NF) to densely networked flake-like (DNF) structures. Subsequently, the microwave processed sample surfaces (AA5083) were grafted with precursors of a silanizing agent (1H, 1H, 2H, 2H-Perfluorooctyltriethoxysilane). The silanization of nanostructured surfaces imparted superhydrophobicity (θs>160°), with low hysteresis (10°) combined with low de-wetting resistance (θt∼40°) indicated metastable Cassie state for NFs owing to reduced longitudinal pinning and three-phase line sagging. As a result of the densely packed structures, the DNFs ensure low adhesion and hysteresis because of enhanced Laplace pressure. The mechanically stable DNFs showed high resilience to dynamic and impact loadings. Thus, microwave processing is a viable and efficient means of generating durable nanostructures for developing metallic superhydrophobic surfaces. [Display omitted] •Facile microwave processing was utilized to develop superhydrophobic aluminum alloy.•Distinct surface morphologies generated through altering microwave power.•Highly dense nanoflake morphological surfaces exhibit a stable Cassie state.•The influence of liquid surface tension on wetting, and adhesion was explored.•Nano flakes showed high wetting and mechanical stability than nano-fibrils.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2021.125310