dc.contributor.advisor |
Hyland, M |
en |
dc.contributor.advisor |
Hodgson, M |
en |
dc.contributor.advisor |
Nguyen, C |
en |
dc.contributor.author |
Sittisart, Pongphat |
en |
dc.date.accessioned |
2017-10-26T21:17:09Z |
en |
dc.date.issued |
2017 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/36258 |
en |
dc.description.abstract |
This research aims to develop a cost-effective and light-weight composite material based on natural fibres for electromagnetic interference shielding. Natural fibres were chosen as they are one of the cheapest forms of fibre, are light-weight and are also a renewable resource. To shield electromagnetic interference, the shielding material must be electrically conductive. Since natural fibres do not have that property, it is necessary to deposit a conductive coating on natural fibres prior to process them into composites. Nickel was chosen as the material to be used for the conductive coating since it is one of the most effective materials for shielding electromagnetic interference. Electroless plating was chosen as the technique for nickel deposition as it is the most suitable method for the application of a conductive coating on a non-conductive substrate. The experimental work was split into three stages. The first stage confirmed the possibility of depositing nickel onto natural fibres as a proof of concept. The second stage was the development and optimisation of the nickel coating of cellulose fibres. The final stage was the incorporation of nickel coated cellulose fibres into polypropylene to create an electrically conductive composite with the purpose of shielding equipment from electromagnetic interference. Additionally, composites based on commercially-available stainless steel fibre were fabricated to establish a baseline for comparison. Material properties, such as electromagnetic interference shielding effectiveness, volume resistivity, surface resistivity and flexural strength for both types of composite, were characterised. Furthermore, the 2D and 3D microstructures of these composites were analysed using computer tomography and ImageJ. The results have indicated that nickel can be successfully deposited onto cellulose fibres, which were then used in fabricating a dense composite. The composite, which contained 50%, by weight, of nickel coated cellulose fibres, achieved a satisfactory shielding level, which may be suitable for use in desktop and laptop computers. Additionally, nickel coated cellulose fibre composites are more suitable than stainless steel fibre composites for application where mechanical strength is important. Qualitative and quantitative analysis of SEM images suggests that nickel coated cellulose fibres have shorter effective fibres aspect ratio than SSF because of curved fibres and fines. These are some reasons why stainless steel fibres composite exhibited a lower percolation threshold than nickel coated cellulose fibres composite. |
en |
dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
PhD Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-nd/3.0/nz/ |
en |
dc.title |
Developing an Alternative Composite Material for Electromagnetic Interference Shielding |
en |
dc.type |
Thesis |
en |
thesis.degree.discipline |
Chemicals & Materials Engineering |
en |
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Doctoral |
en |
thesis.degree.name |
PhD |
en |
dc.rights.holder |
Copyright: The author |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/OpenAccess |
en |
pubs.elements-id |
701374 |
en |
pubs.record-created-at-source-date |
2017-10-27 |
en |
dc.identifier.wikidata |
Q112932800 |
|