Preparation and application of cellulose based sensing materials
department or school: Forestry, Faculty of
data provider: DSpace
degree campus: UBCV
creator: Zhang, Yifan
issued: 2024-09-30T07:00:00Z
issued: 2023
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: To address the increasing environmental concerns related to solid waste disposal, specifically non-biodegradable electronic sensors laden with heavy metals, this thesis investigates an environmentally friendly substitute. We delve into the potential of cellulose, the most abundant natural polymer, in developing biodegradable and flexible 3D sensing materials. In the first part, we create a super-stretchable and self-healing all-cellulose hydrogel. Our technique involves molecular engineering of cellulose chains and their hydrogen bonding network through periodate oxidation ring-opening reactions, followed by borohydride reduction. This innovative approach alleviates chain rigidity, enhances chain mobility, and leads to the production of hydrogels that showcase record-breaking stretchability, quick self-healing properties, and non-Newtonian behavior. The hydrogels are further tested as human motion sensors and ECG electrodes, marking significant strides in wearable technology. The second part of this work presents a super-elastic Carbon Black (CB) coated cellulose sub-micron fiber aerogel sensor, which is developed through ice-templating and electrostatic assembly. By controlling temperature, the 2,2,6,6-Tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibrils (TOCNF) assembles into a 3D sub-micron fiber (SMF) network, achieving elasticity in the aerogel. The CB forms a conductive network structure on the TOCNF SMF surface through electrostatic adsorption. This unique strategy results in a SMF/CB aerogel with super-elasticity, high sensitivity, fast response and recovery times, which opens new avenues for wearable sensor applications. In summary, this thesis advocates for the potential of cellulose in developing eco-friendly, high-performance sensors, offering key insights into cellulose-based hydrogel and aerogel that manifest extraordinary properties, with potential applications in wearable technology and human health monitoring.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/85696
note: Preparation and Application of Cellulose Based Sensing Materials by Yifan Zhang A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Forestry) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) August 2023 ©Yifan Zhang, 2023 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: Preparation and Application of Cellulose Based Sensing Materials submitted by Yifan Zhang in partial fulfilment of the requirements for the degree of Master of Science in Forestry Examining Committee: Feng Jiang, Associate Professor, Wood Science, UBC Supervisor Jack Saddler, Professor, Wood Science, UBC Supervisory Committee Member Scott Renneckar, Professor, Wood Science, UBC Supervisory Committee Member Tianxi Yang, Assistant Professor, Food Science, UBC Additional Examiner iii Abstract To address the increasing environmental concerns related to solid waste disposal, specifically non-biodegradable electronic sensors laden with heavy metals, this thesis investigates an environmentally friendly substitute. We delve into the potential of cellulose, the most abundant natural polymer, in developing biodegradable and flexible 3D sensing materials. In the first part, we create a super-stretchable and self-healing all-cellulose hydrogel. Our technique involves molecular engineering of cellulose chains and their hydrogen bonding network through periodate oxidation ring-opening reactions, followed by borohydride reduction. This innovative approach alleviates chain rigidity, enhances chain mobility, and leads to the production of hydrogels that showcase record-breaking stretchability, quick self-healing properties, and non-Newtonian behavior. The hydrogels are further tested as human motion sensors and ECG electrodes, marking significant strides in wearable technology. The second part of this work prese…
has type: Thesis/Dissertation
date issued: 2023-11
is shown at: 10.14288/1.0435644
language: eng
degree discipline: Forestry
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: Jiang, Feng
type: Text
identifier URI: http://hdl.handle.net/2429/85696