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Surface topography effects on the wettability and antifouling performance of nano-ZnO epoxy composite coatings

Surface topography effects on the wettability and antifouling performance of nano-ZnO epoxy composite coatings
Surface topography effects on the wettability and antifouling performance of nano-ZnO epoxy composite coatings
Nature-inspired eco-friendly superhydrophobic surfaces have attracted great interests from fundamental research to antifouling application. Nanocomposite coatings are an economical way to fabricate superhydrophobic surfaces. This paper studies how the coating topography can be controlled by using different nanoparticle sizes and concentrations. Six three-dimensional surface parameters are used to define the resulting topography and explore the correlations with wettability. Three unique scenarios are proposed based on the relationship between the two key parameters core void volume (Vvc) and core material volume (Vmc) to assess the relationship between surface roughness and solid-liquid contact area fraction (f). A water contact angle (WCA) of 152.6° and contact angle hysteresis (CAH) of 2.9° are obtained by employing dual-sized nanoparticles at 45% nanoparticle concentration (wt./wt.), which is up to 10% less than the superhydrophobic coating fabricated by using single-sized nanoparticles (30 nm). Furthermore, Vvc and peak sharpness dominate f, consequently dominating the wettability in the transitional state and Cassie state, respectively. The antifouling tests using Phaeodactylum tricornutum and Bacillus sp. show a negative correlation between f and antifouling performance, and the minimum adhesion ratios are only 0.41% and 0.53%, respectively. The superhydrophobic surfaces with Vvc/Vmc > 1 are shown to be better for antifouling applications. These findings are important for designing superhydrophobic nanocomposite coatings for antifouling performance.
Antifouling, Nanocomposite coating, Nanoparticles size, Surface topography, Wettability
0257-8972
Chang, Jiangfan
95b80266-12bc-4a71-9bf8-aab89a648708
He, Xiaoyan
81d0a9e2-4187-4c00-94e0-3d013f566be6
Yang, Zongcheng
fc456d55-cd2a-44d1-a13e-96e501aa9469
Bai, Xiuqin
5e2aa80b-3dc8-46e4-afe5-10c98d941019
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Wharton, Julian
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Lu, Ping
fd23d6f6-6474-4a94-95a4-c721d06a354a
Yuan, Chengqing
f5dc1274-76fb-44ef-b242-0e9f7f6129a2
Chang, Jiangfan
95b80266-12bc-4a71-9bf8-aab89a648708
He, Xiaoyan
81d0a9e2-4187-4c00-94e0-3d013f566be6
Yang, Zongcheng
fc456d55-cd2a-44d1-a13e-96e501aa9469
Bai, Xiuqin
5e2aa80b-3dc8-46e4-afe5-10c98d941019
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Wharton, Julian
965a38fd-d2bc-4a19-a08c-2d4e036aa96b
Lu, Ping
fd23d6f6-6474-4a94-95a4-c721d06a354a
Yuan, Chengqing
f5dc1274-76fb-44ef-b242-0e9f7f6129a2

Chang, Jiangfan, He, Xiaoyan, Yang, Zongcheng, Bai, Xiuqin, Wood, Robert, Wharton, Julian, Lu, Ping and Yuan, Chengqing (2022) Surface topography effects on the wettability and antifouling performance of nano-ZnO epoxy composite coatings. Surface and Coatings Technology, 433, [128145]. (doi:10.1016/j.surfcoat.2022.128145).

Record type: Article

Abstract

Nature-inspired eco-friendly superhydrophobic surfaces have attracted great interests from fundamental research to antifouling application. Nanocomposite coatings are an economical way to fabricate superhydrophobic surfaces. This paper studies how the coating topography can be controlled by using different nanoparticle sizes and concentrations. Six three-dimensional surface parameters are used to define the resulting topography and explore the correlations with wettability. Three unique scenarios are proposed based on the relationship between the two key parameters core void volume (Vvc) and core material volume (Vmc) to assess the relationship between surface roughness and solid-liquid contact area fraction (f). A water contact angle (WCA) of 152.6° and contact angle hysteresis (CAH) of 2.9° are obtained by employing dual-sized nanoparticles at 45% nanoparticle concentration (wt./wt.), which is up to 10% less than the superhydrophobic coating fabricated by using single-sized nanoparticles (30 nm). Furthermore, Vvc and peak sharpness dominate f, consequently dominating the wettability in the transitional state and Cassie state, respectively. The antifouling tests using Phaeodactylum tricornutum and Bacillus sp. show a negative correlation between f and antifouling performance, and the minimum adhesion ratios are only 0.41% and 0.53%, respectively. The superhydrophobic surfaces with Vvc/Vmc > 1 are shown to be better for antifouling applications. These findings are important for designing superhydrophobic nanocomposite coatings for antifouling performance.

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Accepted/In Press date: 19 January 2022
e-pub ahead of print date: 24 January 2022
Published date: 15 March 2022
Additional Information: Funding Information: The authors are grateful for financial support by the National Natural Science Foundation of China (Grant No. 52071246 and 52001238 ), the Fundamental Research Funds for the Central Universities (WUT: 52001239 ) and China Scholarship Fund from China Scholarship Council . Publisher Copyright: © 2022 Elsevier B.V. Copyright: Copyright 2022 Elsevier B.V., All rights reserved.
Keywords: Antifouling, Nanocomposite coating, Nanoparticles size, Surface topography, Wettability

Identifiers

Local EPrints ID: 454505
URI: http://eprints.soton.ac.uk/id/eprint/454505
ISSN: 0257-8972
PURE UUID: 21caf570-dcca-41df-8eb2-dbecc1faa660
ORCID for Robert Wood: ORCID iD orcid.org/0000-0003-0681-9239
ORCID for Julian Wharton: ORCID iD orcid.org/0000-0002-3439-017X

Catalogue record

Date deposited: 14 Feb 2022 17:42
Last modified: 26 Jul 2022 01:36

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Contributors

Author: Jiangfan Chang
Author: Xiaoyan He
Author: Zongcheng Yang
Author: Xiuqin Bai
Author: Robert Wood ORCID iD
Author: Julian Wharton ORCID iD
Author: Ping Lu
Author: Chengqing Yuan

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