Berlin 2018 – scientific programme

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BP: Fachverband Biologische Physik

BP 15: Postersession III

BP 15.61: Poster

Tuesday, March 13, 2018, 14:00–16:00, Poster B

DPD with Energy Conservation Simulation of Thermophoretic Particle — •Fatemeh A. Soleymani, Dmitry Fedosov, Marisol Ripoll, and Gerhard Gompper — Forschungszentrum Jülich, Jülich, Germany

The self-propelled particle converts environmental energy into the directed motion. Examples range from chemotactic cells and bacteria to artificial micro-swimmers which are widely studied due to their applications in drug delivery and micro/nanomachines in fluid. The main physical mechanism of propulsion is an inhomogeneous field e.g. a flexible magnetic filament under an applied magnetic field or a self-propelled particle in an inhomogeneous concentration (diffusiophoresis phenomenon) or temperature field (thermophoresis phenomenon). Janus particles are colloidal particles with the inhomogeneous surface feature which can form the field gradient. The Janus particle with a metallic cap absorbs more energy from an external source which can be the heat source (laser beam) or magnetic field. Energy absorption increases the temperature of one cap and the temperature gradient is imposed mainly at poles. We investigate the behavior of the thermophoretic Janus colloid in its temperature gradient by the dissipative particle dynamics method with energy conservation (DPDE). The simulation results show how local fluid-colloid interactions and the temperature gradient near the colloid*s surface control the swimming velocity.