dc.contributor.advisor |
Malmström, Jenny |
|
dc.contributor.author |
Lay, Ratanak |
|
dc.date.accessioned |
2021-10-21T21:03:48Z |
|
dc.date.available |
2021-10-21T21:03:48Z |
|
dc.date.issued |
2021 |
en |
dc.identifier.uri |
https://hdl.handle.net/2292/57083 |
|
dc.description |
Full Text is available to authenticated members of The University of Auckland only. |
en |
dc.description.abstract |
Piezoelectricity, a linear electromechanical coupling phenomenon, is of great interest due to its extensive applications, including energy harvesters, sensors, and tissue engineering. Traditional piezoelectric inorganics show high piezoelectric outputs but are often brittle, inflexible and may contain toxic compounds such as lead. On the other hand, biological piezoelectric materials are biodegradable, biocompatible, abundant, and non-toxic. Thus, they are useful for many applications, such as scaffolds for tissue engineering, biosensors, and energy harvesting. However, a basic understanding of the piezoelectric properties of biological samples is required to develop bio-piezoelectric applications.
This research aims to characterise the piezoelectric properties of bovine tendon collagen and apo-haemoglobin fibrils by using piezoresponse force microscopy (PFM). To assess the feasibility of using the bovine tendon collagen for energy harvesting application, compressive forces ranging from 100-400N were applied to a tendon-based nano-generator, and the produced voltages were measured. To assess the feasibility of using the bovine tendon collagen for biomedical applications, decellularisation treatments of the tendons with Triton X-100 and sodium dodecyl sulphate were also performed to assess the impacts of decellularisation treatments on the tendon’s piezoelectric properties.
It was found that on average, the mean longitudinal piezoelectric coefficients d33 and the mean shear piezoelectric coefficients d15 of non-decellularised tendon collagen were 0.87±0.47 pm/V and 0.62±0.38 pm/V, respectively. Moreover, the non-decellularised tendon-based nano-generator produced electric voltage up to 310 mV when a compressive force of 400 N was applied. The mean longitudinal piezoelectric coefficients d33 and the mean shear piezoelectric coefficients d15 of Triton X-100 decellularised tendon collagen were 0.60±0.44 pm/V and 0.96±0.30 pm/V, respectively. There was no conclusive evidence that the decellularisation treatment with Triton X-100 significantly alters the structural dimension and the piezoelectric properties of the tendon.
The PFM results for apo-haemoglobin fibrils indicated that the apo-haemoglobin fibrils were not piezoelectric. However, additional characterisation techniques should be used to confirm that the fibrils are indeed not piezoelectric since it is possible that the fibrils are weakly piezoelectric, so its piezoelectricity is below the detection limit of PFM. |
|
dc.publisher |
ResearchSpace@Auckland |
en |
dc.relation.ispartof |
Masters Thesis - University of Auckland |
en |
dc.relation.isreferencedby |
UoA |
en |
dc.rights |
Restricted Item. Full Text is available to authenticated members of The University of Auckland only. |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. |
|
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.rights.uri |
http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ |
|
dc.title |
Piezoelectricity in Biological Materials for Energy Applications |
|
dc.type |
Thesis |
en |
thesis.degree.discipline |
Chemical & Materials Engineering |
|
thesis.degree.grantor |
The University of Auckland |
en |
thesis.degree.level |
Masters |
en |
dc.date.updated |
2021-09-06T21:12:56Z |
|
dc.rights.holder |
Copyright: the author |
en |
dc.identifier.wikidata |
Q112955841 |
|