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Reagent Purification Monomers 2-acrylamido-2-methylpropane sulfonic acid (AMPS; 99), acrylamide (AAm; electrophoresis grade, 99), and acrylic acid (AAc; 99) were purchased from Sigma-Aldrich (Oakville, Ontario, Canada). Initiator (4,4'-azo-bis-(4-cyanovaleric acid), ACVA), inhibitor (hydroquinone) and sodium hydroxide were also purchased from Sigma-Aldrich.
Sodium chloride from EMD Millipore (Etobicoke, Ontario, Canada) was used as received. Nitrogen gas (4.