Microgels were synthesized by precipitation polymerization at T = 343 K of N-isopropylacrylamide (NIPAM) in water (0.136 M) in the presence of N,N′-methylenebisacrylamide (BIS) (1.82 mM). The reaction was carried out in the presence of 7.80 mM SDS as surfactant and potassium persulfate (2.44 mM) as radical initiator. The reaction was carried out for 10 hours in nitrogen atmosphere. The obtained colloidal dispersion was purified by exhaustive dialysis against pure water, lyophilized, dispersed in D2O, lyophilized, and dispersed again in D2O to a final concentration of 10%. The obtained microgels were characterized by dynamic light scattering (Zetasizer Nano S, Malvern), and the hydrodynamic diameter was found to be 94 ± 3 nm at 293 K with a size polydispersity of 0.17 ± 0.01 nm.

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