From interfacially complexed structured liquids to electromagnetic shielding aerogels
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Hashemi, Seyyed Alireza
issued: 2025-05-22T15:12:26Z
issued: 2025
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: This thesis explores the innovative use of interfacial complexation to develop a versatile approach for manufacturing functional aerogels. The approach leverages structured liquids as engineerable templates for aerogel production, enabling precise control over the composition and features of aerogels from the nano-scale material chemistry and micro-scale nanoparticle-surfactant assemblies to the macro-scale porous architecture. This high degree of customization facilitated the creation of diverse 3D porous macroscopic constructs, including filamentous, free-standing, and 3D-printed aerogels. Such versatility addresses key challenges in porous construct manufacturing, including enhancing mechanical properties, fine-tuning multi-scale porosities, engineering macroscopic morphologies, inducing stimuli responsiveness, and tailoring compositions for advanced functional applications. The study begins with the synthesis and characterization of essential nanomaterials, including graphene oxide (GO), magnetic graphene oxide (mGO), and cellulose nanofibers (CNF), which serve as the primary building blocks for aerogel construction. This is followed by the design and optimization of the interfacial complexation technique, which involves nanoparticle jamming at the interface of immiscible liquids (oil/water) and stabilizing the non-equilibrium shape of the resulting structured liquids as templates for aerogel production. This approach led to the creation of ultra-lightweight, flexible, and multi-scale porous filamentous aerogels with customizable compositions, where GO played a critical role in maintaining the structured liquid integrity. Controlling aerogel features during the liquid structuring stage enabled the production of a wide range of functional aerogels, with a specific focus on electromagnetic (EM) shielding applications. The concept of "aerogel electromagnetic traps" was then introduced, yielding filamentous aerogels capable of capturing and dissipating incident EM w…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/91170
note: From Interfacially Complexed Structured Liquids to Electromagnetic Shielding Aerogels By Seyyed Alireza Hashemi A DISSERTATION 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) May 2025 © Seyyed Alireza Hashemi, 2025 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: From Interfacially Complexed Structured Liquids to Electromagnetic Shielding Aerogels Submitted by Seyyed Alireza Hashemi in partial fulfillment of the requirements of the degree of Doctor of Philosophy Examining Committee: Dr. Mohammad Arjmand, School of Engineering Supervisor Prof. Abbas Milani, School of Engineering Supervisory Committee Member Dr. Sina Kheirkhah, School of Engineering Supervisory Committee Member Dr. Christopher Collier, School of Engineering University Examiner Dr. Amir Ameli, University of Massachusetts Lowell External Examiner iii Abstract This thesis explores the innovative use of interfacial complexation to develop a versatile approach for manufacturing functional aerogels. The approach leverages structured liquids as engineerable templates for aerogel production, enabling precise control over the composition and features of aerogels from the nano-scale material chemistry and micro-scale nanoparticle-surfactant assemblies to the macro-scale porous architecture. This high degree of customization facilitated the creation of diverse 3D porous macroscopic constructs, including filamentous, free-standing, and 3D-printed aerogels. Such versatility addresses key challenges in porous construct manufacturing, including enhancing mechanical properties, fine-tuning multi-scale porosities, engineering macroscopic morphologies, inducing stimuli responsiveness, and tailoring compositions for advanced functional applications. The study begins w…
has type: Thesis/Dissertation
date issued: 2025-09
is shown at: 10.14288/1.0448925
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/2429/91170