283058 Adsorption of Acrylic/Sulfonic Acid Copolymer-Coated Iron Oxide Nanoclusters On Silica Microspheres At High Divalent Salinity

Monday, October 29, 2012: 2:35 PM
Conference A (Omni )
Hitesh G. Bagaria1, Zheng Xue1, Andrew Worthen1, KiYoul Yoon1, Bethany Neilson2, Victoria Cheng1, JaeHo Lee1, Christopher W. Bielawski3 and Keith P. Johnston1, (1)Chemical Engineering, The University of Texas, Austin, TX, (2)Chemistry, The University of Texas, Austin, TX, (3)Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX

Minimizing the adsorption of engineered nanoparticles (NPs) on rock surface is paramount for feasibility of sub-surface applications and environmental fate of NPs. Natural reservoir brines often have high salinity including the presence of significant divalent cations including calcium that lead to strong NP adsorption.  We recently identified a class of acrylic /sulfonic acid copolymer-coated iron oxide (IO) nanoclusters that display enhanced colloidal stability in the presence of divalent cations.  Here, we report a combinatorial approach to study batch adsorption of IO coated with different polymers on silica microsphere models at various salinity and pH.  The isotherms provide the adsorption capacity and equilibrium adsorption constants for various conditions.  We find that a low adsorption capacity from these batch experiments is a necessary condition for successful transport in flow experiments. Thus, in addition to providing the equilibrium adsorption capacity, the batch isotherms also save time for guiding the more laborious/expensive flow experiments.

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See more of this Session: Functional Nanoparticles and Nanocoatings On Particles II
See more of this Group/Topical: Particle Technology Forum