Iron Oxide Nanoparticles Grafted with Sulfonated Copolymers are Stable in Concentrated Brine at Elevated Temperatures and Weakly Adsorb on Silica

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• 作者：Hitesh G. Bagaria ; Zheng Xue ; Bethany M. Neilson ; Andrew J. Worthen ; Ki Youl Yoon ; Susheela Nayak ; Victoria Cheng ; Jae Ho Lee ; Christopher W. Bielawski ; Keith P. Johnston
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：April 24, 2013
• 年：2013
• 卷：5
• 期：8
• 页码：3329-3339
• 全文大小：490K
• 年卷期：v.5,no.8(April 24, 2013)
• ISSN：1944-8252

文摘

Magnetic nanoparticles that can be transported in subsurface reservoirs at high salinities and temperatures are expected to have a major impact on enhanced oil recovery, carbon dioxide sequestration, and electromagnetic imaging. Herein we report a rare example of steric stabilization of iron oxide (IO) nanoparticles (NPs) grafted with poly(2-acrylamido-2-methylpropanesulfonate-co-acrylic acid) (poly(AMPS-co-AA)) that not only display colloidal stability in standard American Petroleum Institute (API) brine (8% NaCl + 2% CaCl₂ by weight) at 90 掳C for 1 month but also resist undesirable adsorption on silica surfaces (0.4% monolayer NPs). Because the AMPS groups interacted weakly with Ca²⁺, they were sufficiently well solvated to provide steric stabilization. The PAA groups, in contrast, enabled covalent grafting of the poly(AMPS-co-AA) chains to amine-functionalized IO NPs via formation of amide bonds and prevented polymer desorption even after a 40鈥?00-fold dilution. The aforementioned methodology may be readily adapted to stabilize a variety of other functional inorganic and organic NPs at high salinities and temperatures.

Keywords:

poly(2-acrylamido-2-methylpropanesulfonate-co-acrylic acid); superparamagnetic nanoparticles; steric stabilization; high salinity; multipoint grafting; magnetite nanoparticles; electromagnetic imaging