Order parameter and interfacial tension of a colloid-polymer system

The order parameter and interfacial tension of a colloid-polymer system consisting of grafted silica particles in cyclohexane in the presence of the soluble polymer polydimethylsiloxane are determined experimentally in the entire liquid-liquid coexistence region, from the liquid-solid boundary to the critical point. The renormalized critical exponents of the order parameter and interfacial tension are found to be, respectively, ${\beta }^{*}=0.371\mathrm{}\pm 0.026$ and ${\mu }^{*}=1.30\mathrm{}\pm 0.08,$ and are discussed in the light of theoretical predictions.