Turbidity and critical behavior of a colloid-polymer system.

Research paper by B H BH Chen, B B Payandeh, M M Robert

Indexed on: 03 Nov '01Published on: 03 Nov '01Published in: Physical review. E, Statistical, nonlinear, and soft matter physics


The osmotic compressibility and correlation length of a colloid-polymer system, consisting of grafted silica particles in cyclohexane in the presence of the soluble polymer polydimethylsiloxane, are determined by turbidity measurements in the entire one-phase liquid region, with emphasis on the critical region. The renormalized critical exponents of the osmotic compressibility and the correlation length are found to be respectively gamma(*)=1.39+/-0.01 and nu(*)=0.71+/-0.01, while the amplitude of the correlation length is 16.0+/-0.3 nm. Comparison is made with theoretical predictions.