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We study the interaction force between a ring with a dipole density and the tip of an Atomic Force Microscope. Given the vector nature of a dipole we study the force for all possible dipole orientations. These results are applied to the practical problem of a charged ring electrically partially shielded by ions in an electrolyte. We provide theoretical tools to analyze experiments and extract parameters...
We present and solve the problem of measuring charge and size of a ring from electrostatic forces in Atomic Force Microscopy (AFM). We focus our attention on the charge-induced-charge force. From the electric field, the AFM-ring force-separation curve is computed and, based on the shape of the force-separation curve, an algorithm is proposed based on measuring the maximum experimental force to invert...
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