Structural design and fabrication of electrically conductive materials for electromagnetic interference shielding and strain/pressure sensing
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Ghaffarkhah, Ahmadreza
issued: 2023-12-14T18:17:10Z
issued: 2023
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: This thesis explores how structural design influences the performance of advanced materials in electromagnetic interference (EMI) shielding and strain/pressure sensing. Four material categories—laminated, 3D printed, polymer nanocomposites, and aerogels—are explored using various fabrication methods. The journey begins with the synthesis and characterization of foundational nanomaterials, such as Ti₃C₂Tₓ, graphene oxide (GO), and magnetic GO (mGO). These materials form the basis of our structures. Laminated structures are then created through versatile drop-casting, yielding highly conductive Ti₃C₂Tₓ /PEDOT:PSS films. This approach ensures uniformity, cost-effectiveness, and ease of production. A wet-transfer technique is introduced to adapt these films to intricate shapes, ensuring scalability for EMI shielding applications. The development continues with laminated 3D-printed structures tailored for EMI shielding and strain sensing. Challenges associated with extrusion printing, including resolution and the need for high electrical conductivity and mechanical flexibility, are addressed. This phase results in additive-free inks for high-resolution extrusion printing and composite structures with outstanding electrical conductivity and mechanical flexibility. Notably, the material consumption for these 3D-printed structures is nearly 75% lower than that of traditional laminated structures, resulting in significantly reduced fabrication costs essential for large-scale applications. Next, the thesis delves into aerogel-based conductive materials and polymer nanocomposites. A novel "liquid streaming" approach is introduced for aerogel fabrication, using nanoparticle surfactants to stabilize aqueous suspensions of Ti₃C₂Tₓ/GO in a nonpolar medium. These aerogels offer simplicity, reduced pre-processing, exceptional EMI shielding effectiveness, specific EMI shielding effectiveness, and low density, enhanced by micro- and macro-scale porosities that significantly improve ab…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/86948
note: Structural Design and Fabrication of Electrically Conductive Materials for Electromagnetic Interference Shielding and Strain/Pressure Sensing by Ahmadreza Ghaffarkhah B.S., Petroleum University of Technology, 2015 M.S., Amirkabir University, 2018 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLUMBIA Okanagan December 2023 © Ahmadreza Ghaffarkhah, 2023 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a dissertation entitled: Structural Design and Fabrication of Electrically Conductive Materials for Electromagnetic Interference Shielding and Strain/Pressure Sensing submitted by Ahmadreza Ghaffarkhah in partial fulfillment of the requirements of the degree of Doctor of Philosophy. Dr. Mohammad Arjmand, School of Engineering Supervisor Dr. Ian Foulds, School of Engineering Supervisory Committee Member Dr. Abbas Milani, School of Engineering Supervisory Committee Member Dr. Sumi Siddiqua, School of Engineering University Examiner Dr. Patrick C. Lee, University of Toronto External Examiner iii Abstract This thesis explores how structural design influences the performance of advanced materials in electromagnetic interference (EMI) shielding and strain/pressure sensing. Four material categories—laminated, 3D printed, polymer nanocomposites, and aerogels—are explored using various fabrication methods. The journey begins with the synthesis and characterization of foundational nanomaterials, such as Ti3C2Tx, graphene oxide (GO), and magnetic GO (mGO). These materials form the basis of our structures. Laminated structures are then created through versatile drop-casting, yielding highly conductive Ti3C2Tx /PEDOT:PSS films. This approach ensures uniformity, cost-effectiveness, and ease of production. A wet-transfer technique is introduced to adapt these films to intri…
has type: Thesis/Dissertation
date issued: 2024-02
is shown at: 10.14288/1.0438274
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: Arjmand, Mohammad
type: Text
identifier URI: http://hdl.handle.net/2429/86948