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| - Effects of Particle Size and Polydispersity on theDepletion and Structural Forces in Colloidal Dispersions
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| - The effective pair interaction (potential of the mean force)between large hard spherical colloidal particlesin a dispersion containing small hard sphere particles has been studiedtheoretically. We calculated theeffective interaction from the total correlation function by solvingthe Ornstein−Zernike equation. Fora simple binary mixture of particles, the calculated effectiveinteraction between two large (colloidal)particles is found to be oscillatory in general, including both theAsakura−Oosawa type attractive depletionwell and the repulsive energy barrier (which is caused by the formationof small particle layers betweenthese two large particles). A systematic study was conducted toexamine the relationship between theeffective interaction potential and the controllable parameters likethe particle concentration and the sizeratio. The existence of the structural energy barrier is expectedto have dual effects on the stability ofthe large particle dispersion in general: stabilizing in a short timescale and destabilizing in a long timescale. The effect of the polydispersity of small particles on bothdepletion and the structural force betweenlarge particles is also addressed in our study, and we found thatpolydispersity affects the structural energybarrier more than it does the attractive depletion well. Incomparison with the depletion/structuring forcemeasured from the force apparatus experiments, we found that ourtheoretical results are in good agreementwith the experiment.
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