Motion and Trapping of Micro and Millimeter-Sized Particles on the Air-Paramagnetic Liquid Interface [article]

Zoran Cenev, Alois Würger, Quan Zhou
2020 arXiv   pre-print
Understanding the motion of particles on an air-liquid interface can impact a wide range of scientific fields and applications. Diamagnetic particles floating on air-paramagnetic liquid interface are previously known to have a repulsive motion from a magnet. Here we show a novel motion mechanism where the diamagnetic particles floating on the air-paramagnetic liquid interface are attracted and eventually trapped at an off-center distance from the magnet. The behavior of magnetic particles has
more » ... en also studied and the motion mechanisms is theorized in a unified framework, revealing that the motion of particles on air-paramagnetic liquid interface is governed not only by magnetic energy, but as an interplay of the curvature of the interface deformation created by the non-uniform magnetic field, the gravitational potential and the magnetic energy from the particle and the liquid. The attractive motion mechanism has been applied in directed self-assembly and robotic particle guiding.
arXiv:2005.03940v2 fatcat:2erfe4we4ffcjdtdbfssh3zeti