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Paper   IPM / Nano-Sciences / 16916
School of Nano Science
  Title:   3D monitoring of the surface slippage effect on micro-particle sedimentation by digital holographic microscopy
1.  Majid Panahi
2.  Ramin Jamali
3.  Vahideh Farzam Rad
4.  Mojtaba Khorasani
5.  Ahmad Darudi
6.  Ali Reza Moradi
  Status:   Published
  Journal: Scientific Reports
  No.:  12916
  Vol.:  11
  Year:  2021
  Supported by:  IPM
In several phenomena in biology and industry, it is required to understand the comprehensive behavior of sedimenting micro-particles in fluids. Here, we use the numerical refocusing feature of digital holographic microscopy (DHM) to investigate the slippage effect on micro-particle sedimentation near a flat wall. DHM provides quantitative phase contrast and three-dimensional (3D) imaging in arbitrary time scales, which suggests it as an elegant approach to investigate various phenomena, including dynamic behavior of colloids. 3D information is obtained by post-processing of the recorded digital holograms. Through analysis of 3D trajectories and velocities of multiple sedimenting microparticles, we show that proximity to flat walls of higher slip lengths causes faster sedimentation. The effect depends on the ratio of the particle size to (1) the slip length and (2) its distance to the wall. We corroborate our experimental findings by a theoretical model which considers both the proximity and the particle interaction to a wall of different hydrophobicity in the hydrodynamic forces.

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