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Abstract
A protective CoAl-layered double hydroxide (LDH) thin film was developed directly on the aluminum substrate. Further, the low-surface-energy molecules (1H, 1H, 2H, 2H perfluorododecyl trichlorosilane) were incorporated inside the LDH network through an anion exchange mechanism to obtain a superhydrophobic CoAl-LDH surface. The developed films were characterized by scanning electron microscopy (SEM-EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FT-IR), and additional contact angle measurements were made to evaluate the superhydrophobicity of modified CoAl-LDHs against different solutions. The water contact angle (WCA) of the modified CoAl-LDH surface was observed to be about 153° and remained sufficiently stable after long-term immersion in NaCl solution. The effect of excessive ultrasonication on film structural variations and superhydrophobicity was also analyzed for outdoor applications. The high charge transfer resistance observed from the analysis of long-term electrochemical impedance spectroscopy (EIS) indicates the significant corrosion-resistance properties of the developed CoAl-LDHs. This research on protective CoAl-LDHs will bring insights into the understanding of new aspects of surface protection and implementation in many engineering applications.
Highlights
The idea of the present study is to develop cobalt-based layered double hydroxide directly on an aluminum substrate to understand its long-term corrosionresistance properties and subsequently modify it with perfluorododecyl trichlorosilane to develop superhydrophobic CoAl-LDHs to achieve long-term stability and self-cleaning characteristics
The SEM images of developed CoAl-LDH thin films are shown in Figure 2, where a SEM microstructure images of developed thin films are on shown in Figure 2, where a nest-like uniformly grew perpendicular the aluminum substrate
CoAl-LDHs more compact and transformed into a packed flower-like structureofpossibly due tobecame the induced compact and transformed into a packed flower-like structure possibly due to the induced stress of PFDTS in the LDH network, which could be relaxed by the formation of a stress of PFDTS
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Layered double hydroxides (LDHs), a fascinating two-dimensional material system, have gained an attractive class of anionic clays where diverse functional properties, i.e., wide anion exchangeability, environmental suitability, adsorption capacity, wide compositional variations, controllable bandgap energy, photocatalysis, and electrical properties, are highly discussed [1,2,3,4]. The idea of the present study is to develop cobalt-based layered double hydroxide directly on an aluminum substrate to understand its long-term corrosionresistance properties and subsequently modify it with perfluorododecyl trichlorosilane to develop superhydrophobic CoAl-LDHs to achieve long-term stability and self-cleaning characteristics.
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