(257h) Concentration Profile of Rod-Like Particles in a New Hyperlayer Mode of the Field Flow Fractionation: Considering Hydrodynamic Interaction With a Channel Wall

We present theoretical studies on the feasibility of the shape separation of rod-like micro/nanoparticles in a new hyperlayer mode of the field-flow fractionation (FFF).  Park and coworkers analyzed a mechanism for the rod migration in microchannel flows [Park et al. (2007) Phys. Rev. E, 76, 040801; Park & Butler (2009) JFM, 630, p267-298]. They explained that the coupling of Brownian rotation and hydrodynamic interaction with a channel wall induces the rod migration. Among many rod migration mechanisms, it has never been utilized in any of the FFF applications. Therefore, we incorporated this rod migration mechanism into the dynamics of the rod-like particles in FFF to find a potential design for a separation device that sorts particles by shape. We show both the analytically derived concentration profiles of rods in the FFF channel and the corresponding retention ratios as a function of the aspect ratio of the rod with varying the Peclet number.