The importance of oscillatory structural forces in the sedimentation of a binary hard-sphere colloidal suspension / Jan Sudaporn Vesaratchanon in Industrial & engineering chemistry research, Vol. 48 N° 14 (Juillet 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6641–6651 Titre : The importance of oscillatory structural forces in the sedimentation of a binary hard-sphere colloidal suspension Type de document : texte imprimé Auteurs : Jan Sudaporn Vesaratchanon, Auteur ; Alex Nikolov, Auteur ; Darsh Wasan, Auteur Année de publication : 2009 Article en page(s) : pp. 6641–6651 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Colloidal dispersions Hard-sphere suspension Oscillatory structural forces Monte Carlo simulations Stochastic particle dynamics methods Sedimentation experiments Résumé : Concentrated colloidal dispersions are complex systems comprised of colloidal particles of various sizes. This paper summarizes recent experimental and theoretical findings on understanding the interactions between microspheres in the presence of submicrometer particles; the submicrometer particles can be solvent molecules, surfactant micelles, or other nanometer-sized particles. In a hard-sphere suspension containing microspheres in the presence of submicrometer particles, oscillatory structural (entropic) forces between large particles, caused by small particles, arise as a result of the collective particle−particle interactions. The magnitude of the oscillatory structural forces is theoretically estimated based on the statistical mechanics approach, Monte Carlo simulations, and stochastic particle dynamics methods. Also, sedimentation experiments using spherical low-charged, binary hard-sphere particle suspensions with a large size ratio are presented to elucidate the importance of the oscillatory structural forces (i.e., attractive depletion and repulsive structural forces) in particle dispersion stability. Micronmeter-sized, low-charge latex particle concentration profiles in the presence of nanoparticles (nonionic micelles) were monitored using a nondestructive Kossel diffraction technique. To rationalize the experimental observations, the particle settling dynamics were simulated by considering the hydrodynamic interactions, structural forces, and Brownian motion in a gravity field. The theoretical predictions were determined to be in satisfactory agreement with the experimental observations. The effect of the particle size ratio (i.e., micrometer to submicrometer) on interparticle interaction energy is highlighted. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019856 [article] The importance of oscillatory structural forces in the sedimentation of a binary hard-sphere colloidal suspension [texte imprimé] / Jan Sudaporn Vesaratchanon, Auteur ; Alex Nikolov, Auteur ; Darsh Wasan, Auteur . - 2009 . - pp. 6641–6651. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 14 (Juillet 2009) . - pp. 6641–6651 Mots-clés : Colloidal dispersions Hard-sphere suspension Oscillatory structural forces Monte Carlo simulations Stochastic particle dynamics methods Sedimentation experiments Résumé : Concentrated colloidal dispersions are complex systems comprised of colloidal particles of various sizes. This paper summarizes recent experimental and theoretical findings on understanding the interactions between microspheres in the presence of submicrometer particles; the submicrometer particles can be solvent molecules, surfactant micelles, or other nanometer-sized particles. In a hard-sphere suspension containing microspheres in the presence of submicrometer particles, oscillatory structural (entropic) forces between large particles, caused by small particles, arise as a result of the collective particle−particle interactions. The magnitude of the oscillatory structural forces is theoretically estimated based on the statistical mechanics approach, Monte Carlo simulations, and stochastic particle dynamics methods. Also, sedimentation experiments using spherical low-charged, binary hard-sphere particle suspensions with a large size ratio are presented to elucidate the importance of the oscillatory structural forces (i.e., attractive depletion and repulsive structural forces) in particle dispersion stability. Micronmeter-sized, low-charge latex particle concentration profiles in the presence of nanoparticles (nonionic micelles) were monitored using a nondestructive Kossel diffraction technique. To rationalize the experimental observations, the particle settling dynamics were simulated by considering the hydrodynamic interactions, structural forces, and Brownian motion in a gravity field. The theoretical predictions were determined to be in satisfactory agreement with the experimental observations. The effect of the particle size ratio (i.e., micrometer to submicrometer) on interparticle interaction energy is highlighted. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8019856

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