Dynamics of magnetic assembly of binary colloidal structures
Department of Applied Physics, Campus de Fuentenueva, University of Granada - 18071, Granada, Spain
Received: 29 April 2015
Accepted: 23 July 2015
Magnetic field (MF)-directed assembly of colloidal particles provides a step towards the bottom-up manufacturing of smart materials whose properties can be precisely modulated by non-contact forces. Here, we study the MF-directed assembly in binary colloids made up of strong ferromagnetic and diamagnetic microparticles dispersed in ferrofluids. We present observations of the aggregation of pairs and small groups of particles to build equilibrium assemblies. We also develop a theoretical model capable of solving the aggregation dynamics and predicting the particle trajectories, a key factor to understand the physics governing the MF-directed assembly.
PACS: 75.75.Jn – Dynamics of magnetic nanoparticles / 81.16.Dn – Self-assembly / 82.70.Dd – Colloids
© EPLA, 2015