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Special Wettability Coatings, Films and Slippery Liquid Infused Porous Surfaces with Self-cleaning, Anti-icing and Anti-fogging Applications

Heale, Frances Louise; (2020) Special Wettability Coatings, Films and Slippery Liquid Infused Porous Surfaces with Self-cleaning, Anti-icing and Anti-fogging Applications. Doctoral thesis (Eng.D), UCL (University College London). Green open access

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Abstract

This thesis presents research into the use of highly functional special wettability surface technologies for the enhancement of smart decorative paint formulation, self-cleaning materials and anti-icing and anti-fogging devices. Sample preparation via wet deposition, aerosol assisted chemical vapour deposition (AACVD) and lubricant spin coating afforded stain resistant superhydrophobic, self-cleaning water/ice/fog retardant and slippery liquid infused porous surface (SLIPS) materials respectively. In answer to the paint industry's desire for an economically viable self-cleaning decorative paint, low toxicity and reduced cost SiO2 particles were incorporated into aqueous formulations containing octadecanoic acid (FA C18), copolymer dispersant materials and an acrylic latex binder. Practical formulation workability was optimised using a refined FA C18/SiO2 ratio to produce hydrophobic painted surfaces. TiO2 particle dopant studies were completed to assess the impact of multiple minerals on the resulting sample functionality. Superhydrophobic and self-cleaning properties were further enhanced with CaCO3 particles in octadecanoic acid (FA C18) and acrylic latex containing aqueous systems. A range of TiO2 dopant particle loadings were consequently introduced to achieve an optimised superhydrophobic drawn down paint, average water contact angle of 154±5°. Commercial paint additives including a thickening hydroxyethylcellulose Natrosol and a hydrophobic aminofunctional siloxane were explored prior to the draw down of said formulation as a self-cleaning top coat paint. Stain resistance testing identified samples that displayed the greatest resistance to red wine, tea and coffee staining. Other special wettability surfaces with alternative anti-icing and anti-fogging applications have been produced via aerosol assisted chemical vapour deposition (AACVD). TiO2-SnO2 thin film composites were consequently spin coated with a Krytox lubricant. Resulting slippery liquid infused porous surfaces (SLIPS) had underlying intricate nano and micro protrusions, which contributed to the samples' exceptional anti-icing and anti-fogging properties. The final study stream focused on AACVD thin films that were transparent, superhydrophobic and self-cleaning in nature. TiO2 or SiO2 particles were combined with a fluorinated and non-fluorinated polymer precursor mixture. Particle and polymer loadings and temperature variations were comprehensively explored to produce a final optimised thin film, with average contact angles reaching 167° that showed Cassie-Baxter water droplet rolling.

Type: Thesis (Doctoral)
Qualification: Eng.D
Title: Special Wettability Coatings, Films and Slippery Liquid Infused Porous Surfaces with Self-cleaning, Anti-icing and Anti-fogging Applications
Event: University College London
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2020. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
Keywords: superhydrophobic, slippery liquid infused porous surfaces, anti-icing, anti-fogging, self-cleaning, AACVD, thin films
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10112896
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