Browsing by Author "Khdary, Duaa"

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CO₂ RESPONSIVE NANOPARTICLES FOR ENVIRONMENTAL AND INDUSTRIAL APPLICATIONS
(Saudi Digital Library, 2025-05) Khdary, Duaa; Giannelis, Emmanuel
This thesis investigates the interfacial behavior, colloidal stability, foam stabilization capacity, and CO₂ uptake of CO₂-responsive silica nanoparticles, synthesized via surface functionalization with single and dual silane chemistries. The surface modification was carried out using N1-(3-trimethoxysilylpropyl) diethylenetriamine and N,N-diethylaminopropyl trimethoxysilane to impart CO₂-responsiveness and tunable surface properties. Comprehensive characterization techniques were employed to assess their physicochemical properties. Colloidal stability was analyzed using analytical centrifugation, while foamability and foam stability were evaluated under CO₂ and N₂ environments using a Dynamic Foam Analyzer (DFA 100). The results demonstrate that surface chemistry, pH, and gas environment are critical parameters influencing interfacial rheology and particle-mediated stabilization mechanisms. Notably, the engineered nanoparticles exhibited colloidal stability and foam stabilization without the use of conventional surfactants under acidic conditions. This study offers valuable insights into the design of stimuli-responsive nanomaterials for applications in enhanced oil recovery (EOR) and CO₂ capture, and contrasts their performance with traditional surfactant-based systems.
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