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DTSTART;TZID=America/Toronto:20260127T130000
SEQUENCE:0
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URL:https://uwaterloo.ca/chemical-engineering/events/phd-thesistransport-an
 d-irreversible-retention-hydrophobic
LOCATION:E6 - Engineering 6 Room 2022 200 University Ave West Waterloo ON N
 2L 3G1 Canada
SUMMARY:PhD Thesis/Transport and Irreversible Retention of Hydrophobic\nNan
 oparticles by Fluid-Fluid and Fluid-Solid Interfaces in Porous\nMedia by Y
 oussra Rahham
CLASS:PUBLIC
DESCRIPTION:Thesis Title: Transport and Irreversible Retention of Hydrophob
 ic\nNanoparticles by Fluid-Fluid and Fluid-Solid Interfaces in Porous\nMed
 ia\n\nAbstract:\n\nHydrophobic nanoparticle (NP) transport in porous media
  has\nimplications for aquifer transport and retention of a wide range of\
 ncontaminants that infiltrate water resources and threaten human health\na
 s well as aquatic environments. Comprehension of NP transport and\ninterac
 tions with hydrophobic surfaces and interfaces -given their\nubiquity in p
 orous aquifers- is essential for groundwater remediation\nfrom organic con
 taminants\, toxic engineered NPs\, and nanoplastics.\n\nThis research inve
 stigates the transport and attachment of hydrophobic\nNPs under varying ph
 ysicochemical conditions in saturated and\nunsaturated porous media by int
 egrating experimental observations\nacross multiple scales\, theoretical e
 xtended-DLVO predictions\, and\nnumerical modeling. A non-toxic\, negative
 ly-charged\, hydrophobic model\nNP system synthesized from ethyl cellulose
  (EC)\, and exhaustively\ncharacterized for colloidal stability and interf
 acial interactions\,\nwas employed to systematically explore NP interactio
 ns with\nfluid-fluid and solid-fluid interfaces.\n\nThe upscaling capabili
 ty of an advection-dispersion-retention\ncontinuum model was compared vis-
 à-vis a pore network model of\nirreversible NP attachment onto fluid inte
 rfaces in 3D columns packed\nwith spherical glass beads\, showing that the
  latter captures key\npore-scale dynamics such as bypassed interfaces\, sl
 ow-moving corner\nflows\, and diffusion-dominated retention.\n\nTransport 
 experiments in 2D microfluidic pore networks confirm that\nthe dynamics of
  NP retention in unsaturated porous media depend not\nonly on the saturati
 on of the non-wetting phase\, but also on its\nconnectivity and the access
 ibility of immobile fluid-fluid interfaces.
DTSTAMP:20260416T093210Z
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