Université de Fribourg

Tracking of fluorescently labeled polymer particles reveals surface effects during shear-controlled aggregation

Caimi, Stefano ; Cingolani, Alberto ; Jaquet, Baptiste ; Siggel, Marc ; Lattuada, Marco ; Morbidelli, Massimo

In: Langmuir, 2017, vol. 33, no. 49, p. 14038–14044

Surface chemistry is believed to be the key parameter affecting the aggregation and breakage of colloidal suspensions when subjected to shear. To date, only a few works dealt with the understanding of the role of the physical and chemical properties of the particles’ surface upon aggregation under shear. Previous studies suggested that surface modifications strongly affect polymer...

Université de Fribourg

Population-balance description of shear-induced clustering, gelation and suspension viscosity in sheared DLVO colloids

Lattuada, Marco ; Zaccone, Alessio ; Wu, Hua ; Morbidelli, Massimo

In: Soft Matter, 2016, vol. 12, no. 24, p. 5313–5324

Application of shear flow to charge-stabilized aqueous colloidal suspensions is ubiquitous in industrial applications and as a means to achieve controlled field-induced assembly of nanoparticles. Yet, applying shear flow to a charge-stabilized colloidal suspension, which is initially monodisperse and in quasi-equilibrium leads to non-trivial clustering phenomena (and sometimes to a gelation...