Pattern formation and collective effects in populations of magnetic microswimmers

Self-propelled particles are one prototype of synthetic active matter used to understand complex biological processes, such as the coordination of movement in bacterial colonies or schools of fishes. Collective patterns such as clusters were observed for such systems, reproducing features of biological organization. However, one limitation of this model is that the synthetic assemblies are made of identical individuals. Here we introduce an active system based on magnetic particles at colloidal scales. We use identical but also randomly-shaped magnetic micropropellers and show that they exhibit dynamic and reversible pattern formation.

[1]  Dirk Helbing,et al.  Simulating dynamical features of escape panic , 2000, Nature.

[2]  Joshua E S Socolar,et al.  Binary colloidal structures assembled through Ising interactions , 2012, Nature Communications.

[3]  A. Czirók,et al.  Collective Motion , 1999, physics/9902023.

[4]  Xiaomiao Feng,et al.  Bioinspired helical microswimmers based on vascular plants. , 2014, Nano letters.

[5]  Daniel T. N. Chen,et al.  Spontaneous motion in hierarchically assembled active matter , 2012, Nature.

[6]  Krzysztof K. Krawczyk,et al.  Magnetic Helical Micromachines: Fabrication, Controlled Swimming, and Cargo Transport , 2012, Advanced materials.

[7]  Yadong Yin,et al.  Responsive photonic crystals. , 2011, Angewandte Chemie.

[8]  Christos Bergeles,et al.  Characterizing the swimming properties of artificial bacterial flagella. , 2009, Nano letters.

[9]  H. Stark,et al.  Dynamics of cluster formation in driven magnetic colloids dispersed on a monolayer , 2012, Journal of physics. Condensed matter : an Institute of Physics journal.

[10]  Erik Luijten,et al.  Linking synchronization to self-assembly using magnetic Janus colloids , 2012, Nature.

[11]  C. Ybert,et al.  Dynamic clustering in active colloidal suspensions with chemical signaling. , 2012, Physical review letters.

[12]  Vincent M. Rotello,et al.  Magnetic assembly of colloidal superstructures with multipole symmetry , 2009, Nature.

[13]  T. Vicsek,et al.  Hierarchical group dynamics in pigeon flocks , 2010, Nature.

[14]  Li Zhang,et al.  Bio-inspired magnetic swimming microrobots for biomedical applications. , 2013, Nanoscale.

[15]  Yutaka Sumino,et al.  Large-scale vortex lattice emerging from collectively moving microtubules , 2012, Nature.

[16]  Jake J. Abbott,et al.  How Should Microrobots Swim? , 2009, ISRR.

[17]  Erwin Frey,et al.  Polar patterns of driven filaments , 2010, Nature.

[18]  C. Hierold,et al.  Superparamagnetic Twist‐Type Actuators with Shape‐Independent Magnetic Properties and Surface Functionalization for Advanced Biomedical Applications , 2014 .

[19]  Bartosz A. Grzybowski,et al.  Colloidal assembly directed by virtual magnetic moulds , 2013, Nature.

[20]  I. Aranson,et al.  Concentration dependence of the collective dynamics of swimming bacteria. , 2007, Physical review letters.

[21]  Jake J. Abbott,et al.  How Should Microrobots Swim? , 2009 .

[22]  P. Fischer,et al.  Controlled propulsion of artificial magnetic nanostructured propellers. , 2009, Nano letters.

[23]  P. Fratzl,et al.  Fast Magnetic Micropropellers with Random Shapes , 2015, Nano letters.

[24]  Jean-Baptiste Caussin,et al.  Emergence of macroscopic directed motion in populations of motile colloids , 2013, Nature.

[25]  George M. Whitesides,et al.  Dynamic self-assembly of magnetized, millimetre-sized objects rotating at a liquid–air interface , 2000, Nature.

[26]  Tim Sanchez,et al.  Topology and dynamics of active nematic vesicles , 2014, Science.

[27]  David J. Pine,et al.  Living Crystals of Light-Activated Colloidal Surfers , 2013, Science.

[28]  H. Swinney,et al.  Collective motion and density fluctuations in bacterial colonies , 2010, Proceedings of the National Academy of Sciences.

[29]  P. Fratzl,et al.  Selecting for Function: Solution Synthesis of Magnetic Nanopropellers , 2013, Nano letters.

[30]  S. Granick,et al.  Rotating crystals of magnetic Janus colloids. , 2015, Soft matter.

[31]  Wei Gao,et al.  The environmental impact of micro/nanomachines: a review. , 2014, ACS nano.