Inexpensive and non-toxic water repellent coatings comprising SiO2 nanoparticles and long chain fatty acids

Frances L. Heale; Kristopher Page; James S. Wixey; Philip Taylor; Ivan P. Parkin; Claire J. Carmalt

doi:10.1039/C8RA04707C

Inexpensive and non-toxic water repellent coatings comprising SiO₂ nanoparticles and long chain fatty acids

Frances L. Heale,

^a Kristopher Page,^a James S. Wixey,^b Philip Taylor,^b Ivan P. Parkin

^a and Claire J. Carmalt

*^a

Author affiliations

* Corresponding authors

^a Department of Chemistry, University College London, 20 Gordon Street, London, UK
E-mail: c.j.carmalt@ucl.ac.uk

^b AzkoNobel, Wexham Road, Slough, UK

Abstract

Special wettability durable coatings, with average water contact angles exceeding 140°, have been fabricated utilising functionalised hydrophobic-SiO₂ (H-SiO₂) particles embedded in fatty acids. The inexpensive and non-toxic H-SiO₂ particles imparted delicate lotus leaf inspired hierarchical surface nano-morphologies while the fatty acid modification afforded a suitable drop in surface energy. Comparison studies were carried out to explore the effects of fatty acid chain length and pipette as opposed to spray coating deposition methods on the coatings hydrophobicity. It was determined that the longest chain length fatty acid coatings showed enhanced hydrophobic properties due to their extended hydrophobic alkyl chain. A pipette deposited suspension containing H-SiO₂ nanoparticles and octadecanoic acid generated a coating with the most favourable average water contact and tilting angles of 142 ± 6° and 16 ± 2° respectively.

Article information

https://doi.org/10.1039/C8RA04707C

Article type

Paper

Submitted

05 Jun 2018

Accepted

17 Jul 2018

First published

31 Jul 2018

This article is Open Access

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RSC Adv., 2018,8, 27064-27072

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Inexpensive and non-toxic water repellent coatings comprising SiO₂ nanoparticles and long chain fatty acids

Frances L. Heale, K. Page, J. S. Wixey, P. Taylor, I. P. Parkin and C. J. Carmalt, RSC Adv., 2018, 8, 27064 DOI: 10.1039/C8RA04707C

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Inexpensive and non-toxic water repellent coatings comprising SiO₂ nanoparticles and long chain fatty acids

Abstract

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Inexpensive and non-toxic water repellent coatings comprising SiO₂ nanoparticles and long chain fatty acids

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