Figure 9.

Left: Cloud points of a 60 mm triethylene glycol monomethyl ether solution in the presence of POMs: SiW⁴⁻ (SiW₁₂O₄₀ ⁴⁻) and PW³⁻ (PW₁₂O₄₀ ³⁻) and sodium salts with various representative anions of the Hofmeister series: SCN⁻ (chaotropic), WO₄ ⁻ (kosmotropic), and Cl⁻ (intermediate between salting‐in and salting‐out). Inset: Ion‐containing surfactant solution at temperatures below (left) and above (right) the cloud point. Right: Schematic of the adsorption of a POM anion on a hydrophilic interface covered by a polyethoxylated surfactant (right). Reprinted with permission from Ref. 16.