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The effect of different ionic cosolutes (NaCl, Na$_2$SO$_4$, Li$_2$SO$_4$,NaSCN, Na$_2$[Fe(CN)5NO], and Na$_3$[Co(NO)$_6$]) on the interaction betweensodium dodecyl sulfate (SDS) and poly(ethylene oxide) (PEO) was examined bysmall-angle X-ray scattering (SAXS) and isothermal titration calorimetrictechniques. The critical aggregation concentration values (cac), the saturationconcentration ($C_2$), the integral enthalpy change for aggregate formation($\Delta H_{\mbox{agg}}$(int)) and the standard free energy change of micelleadsorption on the macromolecule chain ( $\Delta\Delta G_{\mbox{agg}}$) werederived from the calorimetric titration curves. In the presence of 1.00 mmolL$^{-1}$ cosolute, no changes in the parameters were observed when comparedwith those obtained for SDS-PEO interactions in pure water. For NaCl,Na$_2$SO$_4$, Li$_2$SO$_4$, and NaSCN at 10.0 and 100 mmol L$^{-1}$, thecosolute presence lowered cac, increased $C_2$, and the PEO-SDS aggregatebecame more stable. In the presence of Na$_2$[Fe(CN)5NO], the calorimetrictitration curves changed drastically, showing a possible reduction in thePEO-SDS degree of interaction, possibility disrupting the formed nanostructure;however, the SAXS data confirmed, independent of the small energy observed, thepresence of aggregates adsorbed on the polymer chain.

Microcalorimetric and SAXS Determination of PEO-SDS Interactions: The Effect of Cosolutes Formed by Ions