Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664728
Title: Wetting of non rigid surfaces
Author: Geraldi, N. R.
ISNI:       0000 0004 5365 3953
Awarding Body: Nottingham Trent University
Current Institution: Nottingham Trent University
Date of Award: 2015
Availability of Full Text:
Access from EThOS:
Access from Institution:
Abstract:
In the world of anti-wetting surfaces, many superhydrophobic substrates comprise rigid structures on rigid substrates. The development of a thin flexible substrate would allow new avenues to be explored to fully take advantage of the non-wetting properties of superhydrophobicity. This thesis presents a novel production method and subsequent analysis of thin, conformable, superhydrophobic films based on the embedding of carbon nano-particles (CNPs) into the surface of polydimethylsiloxane (PDMS) substrates. Firstly experiments were performed to determine the effects of surface roughness on the capillary origami process. It was found that the droplet wrapping process could be controlled with the appropriate choice of liquid. Using a wetting liquid would see an enhanced wrapping state whereas use of a dewetting liquid would see a complete suppression of the wrapping process. The second set of experiments concentrated on determining whether or not it is possible to reduce the drag force experienced on cylinders in a laminar flow situation. By comparing an uncoated cylinder to a CNP PDMS coated cylinder of equivalent diameter, it was determined that it is possible to reduce the drag by a maximum of 28%. The last tests were to determine the potential of the surface as a snail-repellent material. A set of experiments, designed to compare the repellent and adhesive properties of the surface were performed. It was seen that these surfaces show promise as a snail repellent surface. This surface is in keeping with the hypothesis of Shirtcliffe et al. [1] which states an effective snail repellent surface shows anti-adhesive properties and maintains a high receding contact angle in the presence of an anionic surfactant.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.664728  DOI: Not available
Share: