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Micromachines 2018, 9(1), 35; doi:10.3390/mi9010035

Pair Interaction of Catalytical Sphere Dimers in Chemically Active Media

1
Department of Physics, Hangzhou Dianzi University, Hangzhou 310018, China
2
Department of Physics, Zhejiang University, Hangzhou 310027, China
3
Department of Physics, Huzhou University, Huzhou 313000, China
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Received: 30 December 2017 / Revised: 11 January 2018 / Accepted: 11 January 2018 / Published: 17 January 2018
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Abstract

We study the pair dynamics of two self-propelled sphere dimers in the chemically active medium in which a cubic autocatalytic chemical reaction takes place. Concentration gradient around the dimer, created by reactions occurring on the catalytic sphere surface and responsible for the self-propulsion, is greatly influenced by the chemical activities of the environment. Consequently, the pair dynamics of two dimers mediated by the concentration field are affected. In the particle-based mesoscopic simulation, we combine molecular dynamics (MD) for potential interactions and reactive multiparticle collision dynamics (RMPC) for solvent flow and bulk reactions. Our results indicate three different configurations between a pair of dimers after the collision, i.e., two possible scenarios of bound dimer pairs and one unbound dimer pair. A phase diagram is sketched as a function of the rate coefficients of the environment reactions. Since the pair interactions are the basic elements of larger scale systems, we believe the results may shed light on the understanding of the collective dynamics. View Full-Text
Keywords: pair interaction; catalytically sphere dimer; chemically active medium; multiparticle collision dynamics; phase diagram pair interaction; catalytically sphere dimer; chemically active medium; multiparticle collision dynamics; phase diagram
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Shi, J.-M.; Cui, R.-F.; Xiao, J.; Qiao, L.-Y.; Mao, J.-W.; Chen, J.-X. Pair Interaction of Catalytical Sphere Dimers in Chemically Active Media. Micromachines 2018, 9, 35.

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