Electrostatic heteroaggregation regimes in colloidal suspensions

Heteroaggregation of ceramic colloids in suspensions

“…Heteroaggregation of colloids has received more and more interest since few years [2][3][4]. Particular attention has been paid for example on the determination of the absolute heteroaggregation rate constants [5].…”

Simple statistical thermodynamic model of the heteroaggregation and gelation of dispersions and emulsions

“…What this implies, of course, is that the properties of the system are determined by a balance of energetic terms and entropic factors. Therefore the approach is distinctly different from the Brownian dynamics simulation of irreversible heteroaggregation [5,[10][11][12][13]38], where computed aggregate sizes and aggregate/gel structures are predominantly kinetically controlled. The present approach should also be distinguished from other methods that do not take account of ensemble-averaged entropic contributions, e.g., the determination of individual heteroaggregate structures by global energy minimization [13].…”

“…In many of the experimental systems investigated, these aggregates are held together by strong attractive electrostatic interactions between unlike particles of opposite net charge [1][2][3][4][5][6][7][8][9][10][11][12]. Depending on the particular characteristics and relative proportions of the colloidal particles involved, the process of heteroaggregation leads to the formation of various sizes of discrete clusters in dilute dispersions, and to the development of particle gel networks in more concentrated systems.…”

“…The formation of these large mixed aggregates and particle networks is typically associated with a substantial change in system rheology. Some of the structural features of clusters and particle gels formed by irreversible heteroaggregation have been reproduced in computer simulations [3,5,[10][11][12][13]. In terms of the practical application, there has been a resurgence of interest in mixed dispersions of (nano)particles exhibiting heteroaggregation following the recent demonstrations of their effectiveness in the Pickering stabilization of oil-in-water emulsions [14,15].…”

Effect of pH on rheology of aqueous Al2O3/SiC colloidal system

“…The factors such as volume fraction and number ratio affect the total energy of a colloidal system simultaneously. Internal structures are difficult to observe experimentally at a microscopic level [15][16][17][18][19]. Probing the experimental system in such detail is not an easy task, specifically the system with more components and dispersants.…”