Core and core-shell microgels are synthesized by aqueous free radical precipitation polymerization and their solvent release effects characterized. Dynamic light scattering (DLS) reveals hydrodynamic radii (Rh) decrease sharply at lower critical solution temperature (LCST) of 32 degrees C. Electrochemical properties of microgels were also investigated using cyclic voltammetry (CV) and chronoamperometry (CA) with electroactive probes: Fc(MeOH)(2), uncharged and Ru(NH3)(6)Cl-3, positively charged. By measuring the effect of temperature change on the diffusion coefficients, I estimated the electrostatic interactions in varying solutions: aqueous (without migrogels), 25% core microgel and 25 % core-shell microgel solution systems. The diffusion coefficient of uncharged ferrocenedimethanol Fc(MeOH)(2)was found to increase as temperature increases, in both core or core-shell solutions. Positive charged Ru(NH3)(6)Cl-3 shows a different behavior in both 25% core and 25% core-shell systems. In aqueous solution, increasing temperature brings increased diffusion coefficients. With the addition of core and core-shell microgel solution systems, diffusion coefficients fall sharply above LCST. This suggests that there is some amount of electrostatic interactions between negatively charged core and core-shell microgels and positively charged Ru(NH3)(6)Cl-3.