Aggregation kinetics of carbonyl iron based magnetic suspensions in 2D

作者：Shahrivar Keshvad; Carreon Gonzalez Elizabeth; Morillas Jose R; de Vicente Juan

来源：Soft Matter, 2017, 13(14): 2677-2685.

DOI：10.1039/c7sm00075h

We investigate the (irreversible) two-dimensional aggregation kinetics of dilute non-Brownian magnetic suspensions in rectangular microchannels using video-microscopy, image analysis and particle-level dynamics simulations. Special emphasis is given to carbonyl iron suspensions that are of interest in the formulation of magnetorheological fluids. The results are compared to non-Brownian suspensions of magnetic latexes. We demonstrate that both suspensions follow a deterministic aggregation process. Furthermore, experimental and simulation aggregation curves can be collapsed onto a master curve when using the appropriate scaling time (proportional to lambda(-1) phi(2D) (-2.5)) as a function of only two dimensionless numbers: the lambda ratio (lambda) and the particle surface fraction (phi(2D)).

• 出版日期2017-4-14