Selfdiffusiophoretic Janus colloids

摘要: Moving through a fluid is common experience for all humans. Even if one not skilled swimmer any kind of paddling motion will propel you forward. The based on transfer momentum from the to fluid. However, there are regimes, described by low Reynolds numbers, where this propulsion does work. For small length scales and sufficiently velocities behaves similar honey. This means, every immediately damped it sustained permeant external force. physics, regime particular interest as many biological systems like bacteria or colloids faced these conditions. It was first pointed out in seminal work Eric Purcell [1] that order at numbers permanent non-time-reversal has be kept up, example power recovery strokes bacterial cilia [2]. inspired lot experimental build up number swimmers principle [3]. They could e.g. used microfluidic devices [4] drug carriers human body. let an artificial evolve set configurations controlled way, some mechanism applied. In most applications, magnetic field derive effect. can drawback have explore complex environments. recent years, alternative approaches gradients, especially particle received considerable interest. gradient approach been gradients nutrients, called chemotaxis. mechanism, however, relies rather complicated internal machinery reorientate bacterium. An more simple physical guarantee highly controllable motion. One promising candidates diffusiophoresis. explains colloid active process interface between solid [5]. Recently, extended so selfdiffusiophoretic [6, 7] which driven but produce themselves. though analytical trying describe phenomenom [8, 9], due coupling hydrodynamics evolution solute difficult obtain complete description. simulations able capture both contributions. Classically, two simulate hydrodynamics. tries mimic effective force embedded objects, Stokesian Dynamic [10]. second explicitly models its interaction with relevant boundary former veritable tool address effect relaxation polymers implement fluids case swimmers. Therefore, Most thermal fluctuations neglected. sufficient assumption