Synthesis and characterizations of antimicrobial coating by atomic layer deposition technique for personal protective equipment applications
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Tao, Li
issued: 2023-01-10T16:39:53Z
issued: 2022
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The outbreak of COVID-19 has led to significant demand for Personal Protective Equipment (PPE), such as masks and face shields. While these PPEs can protect people from many infectious agents, they usually are one-time use and non-degradable after disposal, causing a shortage of supply and environmental issues. While many reusable substitutes, such as reusable cloth masks, were developed, their prevention capability might be compromised after prolonged usage. As such, self-disinfecting coatings have been applied to PPEs to improve antibacterial and antiviral properties. However, commercial coating methods, such as spraying and physical vapor deposition, have several limitations for PPE applications, including poor coverage, loose adhesion, and high coating temperature. This thesis work adopted an advanced atomic layer deposition (ALD) technique to fabricate nanoscale self-disinfecting coatings that overcome the above mentioned coating approaches limitations. This work investigated the ALD fabrication, material characterizations, and antimicrobial performance of titanium oxide (TiO₂) and zinc oxide (ZnO), two typical UV-activated self-disinfecting materials. The ALD-deposited TiO₂ and ZnO thin films on the glass substrate had thickness of 81.6 ± 6.6 nm and 312.8 ± 41.3 nm, respectively. Structural analysis by X-ray diffraction, Raman spectroscopy, and X-ray photoelectron microscopy confirmed the successful deposition of TiO₂ and ZnO, most of which were amorphous. The antimicrobial properties of the ALD-TiO₂ and ZnO were evaluated against E. coli, under modified AATCC-100 standard, with commercial TiO₂ and ZnO powders as references. Data indicated that ALD-ZnO could eliminate E. coli during a 12-hour test. All the data were verified through P value test with alpha set to 0.05, and statistically proved the antimicrobial performance of the ALD-ZnO. Moreover, the nanoscale ALD-ZnO exhibited antimicrobial properties similar to commercial ZnO. On the other hand, P-value te…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/83620
note: SYNTHESIS AND CHARACTERIZATIONS OF ANTIMICROBIAL COATING BY ATOMIC LAYER DEPOSITION TECHNIQUE FOR PERSONAL PROTECTIVE EQUIPMENT APPLICATIONS by Li Tao BASc., University of British Columbia, 2020 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) December 2022 © Li Tao, 2022 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: Synthesis and Characterizations of Antimicrobial Coating by Atomic Layer Deposition Technique for Personal Protective Equipment Applications. submitted by Li Tao. in partial fulfillment of the requirements of the degree of Master of Applied Science. Dr. Jian Liu, School of Engineering Supervisor Dr. Sepideh Pakpour, School of Engineering Co-supervisor Dr. Dimitry Sediako, School of Engineering Supervisory Committee Member Dr. Hadi Mohammadi, School of Engineering Supervisory Committee Member Dr. Liwei Wang, Electrical Engineering, School of Engineering University Examiner iii Abstract The outbreak of COVID-19 has led to significant demand for Personal Protective Equipment (PPE), such as masks and face shields. While these PPEs can protect people from many infectious agents, they usually are one-time use and non-degradable after disposal, causing a shortage of supply and environmental issues. While many reusable substitutes, such as reusable cloth masks, were developed, their prevention capability might be compromised after prolonged usage. As such, self-disinfecting coatings have been applied to PPEs to improve antibacterial and antiviral properties. However, commercial coating methods, such as spraying and physical vapor deposition, have several limitations for PPE applications, including poor coverage, loose adhesion, and high coating temperature. This thesis work adopted an advanced …
has type: Thesis/Dissertation
date issued: 2023-02
is shown at: 10.14288/1.0423026
language: eng
degree discipline: Mechanical 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: Liu, Jian
contributor: Pakpour, Sepideh
type: Text
identifier URI: http://hdl.handle.net/2429/83620