Papers Published

  1. Yang, Ye and Erb, Randall M. and Wiley, Benjamin J. and Zauscher, Stefan and Yellen, Benjamin B., Imaginary Magnetic Tweezers for Massively Parallel Surface Adhesion Spectroscopy, NANO LETTERS, vol. 11 no. 4 (April, 2011), pp. 1681-1684 [doi] .
    (last updated on 2011/08/19)

    A massively parallel magnetic tweezer system has been constructed that utilizes the self-repulsion of colloidal beads from a planar interface via a magnetic dipole image force. Self repulsion enables the application of a uniform magnetic force to thousands of beads simultaneously, which permits the measurement of unbinding histograms at the lowest loading rates ever tested. The adhesion of 9.8 mu m polystyrene beads to a fluorocarbon, PEG, and UV-irradiated PEG surfaces were measured between 10(-3)-10 degrees pN/s force loading rates, revealing the presence of both kinetic and quasi-equilibrium unbinding regimes.