Design and evaluation of textile electrodes for biological signal monitoring
department or school: Applied Science, Faculty of
department or school: Materials Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Le, Katherine
issued: 2023-04-18T17:14:34Z
issued: 2023
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Developments in electronic textiles (e-textiles) have focused on integration into remote physiological monitoring systems. This has encompassed functionalized textile sensors for continuous biopotential signal collection. This research examines structural hierarchical effects in e-textiles to understand properties influencing the performance of e-textile sensors. Electrocardiography (ECG), a bioelectric signal associated with electrical activity of the heart muscle, was selected for evaluating e-textile electrode performance. The structure-property relationships of fibre and yarn to fabric systems were investigated for silver (Ag)-nylon textiles. Fibre geometry and yarn twist were found to impact yarn linear resistance, and electrode contact impedance at the fabric level up to limiting values. Influencing factors at the yarn level were explained by contact between fibres in the yarn structure, yarn specific volume, fibre volume fraction, and orientation angles. At the fabric level, influencing factors included yarn diameter, fibre packing, and apparent contact area of the electrode. Skin-electrode interfacial interaction, and relationship to biopotential signal quality were characterized through surface roughness and skin contact impedance measurements of knitted electrodes. Compatibility at the skin-electrode interface was impacted by skin hydration, roughness, and applied pressure. A high throughput roll-to-roll system was developed to produce electrochemically coated silver/silver-chloride (Ag/AgCl) yarns, and the process was characterized. Electrodes were fabricated through embroidery of Ag/AgCl yarns. The performance of Ag/AgCl e-textile electrodes was compared against embroidered Ag e-textiles, and standard Ag/AgCl electrodes. The Ag/AgCl e-textile electrodes demonstrated excellent ECG signal quality, and high stability based on polarization potential measurements when compared to Ag e-textiles. Durability of e-textiles for long-term use was addressed through …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/84245
note: DESIGN AND EVALUATION OF TEXTILE ELECTRODES FOR BIOLOGICAL SIGNAL MONITORING by Katherine Le B.A.Sc., University of Toronto, 2014 M.A.Sc., University of Toronto, 2016 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Materials Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) April 2023 © Katherine Le, 2023 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: Design and Evaluation of Textile Electrodes for Biological Signal Monitoring submitted by Katherine Le in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Materials Engineering Examining Committee: Frank Ko, Professor, Materials Engineering, UBC Supervisor Peyman Servati, Professor, Electrical and Computer Engineering, UBC Co-supervisor Elod Gyenge, Professor, Chemical and Biological Engineering, UBC University Examiner Urs Hafeli, Professor, Pharmaceutical Sciences, UBC University Examiner Jinlian Hu, Professor, Biomedical Engineering, City University of Hong Kong External Examiner Additional Supervisory Committee Members: John Madden, Professor, Electrical and Computer Engineering, UBC Supervisory Committee Member Rizhi Wang, Professor, Materials Engineering, UBC Supervisory Committee Member iii Abstract Developments in electronic textiles (e-textiles) have focused on integration into remote physiological monitoring systems. This has encompassed functionalized textile sensors for continuous biopotential signal collection. This research examines structural hierarchical effects in e-textiles to understand properties influencing the performance of e-textile sensors. Electrocardiography (ECG), a bioelectric signal associated with electrical activity of the heart muscle, was selected for evaluating e-textile electrode performance. The structure-property relat…
has type: Thesis/Dissertation
date issued: 2023-05
is shown at: 10.14288/1.0431088
language: eng
degree discipline: Materials Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Ko, Frank K.
contributor: Servati, Peyman
type: Text
identifier URI: http://hdl.handle.net/2429/84245