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We report a comprehensive experimental-theoretical study of the temperature-and concentrationdependent swelling behavior of weakly cross-linked PNiPAm ionic microgel particles in the deionized fluid phase. The particles swell reversibly when the dispersion is cooled from the collapsed state to lower temperatures. While the collapsed state shows no dependence on the microgel number density, the swelling at lower T is more pronounced at lower concentrations. The static pair correlations anddoi:10.1103/physrevlett.109.048302 pmid:23006114 fatcat:aui7s4h7qvbmros7yihbpsgrja