Theoretical prediction of the behaviour of superparamagnetic colloidal particles under magnetic fields
Jordi Faraudo,1 Jordi S. Andreu,1,2 Carles Calero,3 Juan Camacho2
Predicting the Self-Assembly of Superparamagnetic Colloids under Magnetic Fields Advanced Functional Materials, 26 (22), 3837-3858, 2016
Experimental behaviour of colloidal particles under magnetic fields (left) can be predicted using computer simulations (right) and analytical equations (below) derived from our new models.
Superparamagnetic particles are a class of magnetic particles, which are particularly interesting due to their tunable magnetic response: they are not magnetic in absence of external fields but they have a substantial magnetic response to applied fields. These particles, in suspension, tend to self-assembly in the presence of magnetic fields, forming structures that have a substantial impact in their use in practical applications. In this article1, we describe our recent advances in the development of theoretical tools (analytical equations and methodologies for computer simulations) that allow the quantitative, theoretical prediction of the behaviour of superparamagnetic particles under a magnetic field. A practical view is presented of how to employ the new concepts (derived from thermodynamic theory) to predict the possible assembled structures from the properties of the colloids and thermodynamic conditions. Quantitative prediction of kinetics is also discussed for the cases in which equilibrium theory is not relevant.
1 Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Spain 2 Dept. de Física, Universitat Autònoma de Barcelona (UAB), Spain 3 Dept. de Física, Fonamental, Universitat de Barcelona (UB), Spain
Institut de Ciència de Materials de Barcelona Campus de la UAB 08193 Bellaterra, SPAIN