TY - JOUR

T1 - The escape of a particle from a driven harmonic potential to an attractive surface

AU - Tshiprut, Z.

AU - Klafter, J.

AU - Urbakh, M.

N1 - Funding Information:
J.K. and M.U. acknowlege the support by the German Research Foundation (DFG) via Grant Ha 1517/26-1, 2 (“Single molecules”).

PY - 2006

Y1 - 2006

N2 - We investigate theoretically the dynamics of a colloidal particle, trapped by optical tweezers, which gradually approaches an attractive surface with a constant velocity until it escapes the trap and jumps to the surface. We find that the height of the energy barrier in such a colloid-surface system follows the scaling ΔE (z0 (t) -const)32 when the trap approaches the surface, z0 (t) being the trap surface distance. Using this scaling we derive equations for the probability density function of the jump lengths, for the velocity dependence of its mean and most probable values, and for the variance. These can be used to extract the parameters of the particle-surface interaction from experimental data.

AB - We investigate theoretically the dynamics of a colloidal particle, trapped by optical tweezers, which gradually approaches an attractive surface with a constant velocity until it escapes the trap and jumps to the surface. We find that the height of the energy barrier in such a colloid-surface system follows the scaling ΔE (z0 (t) -const)32 when the trap approaches the surface, z0 (t) being the trap surface distance. Using this scaling we derive equations for the probability density function of the jump lengths, for the velocity dependence of its mean and most probable values, and for the variance. These can be used to extract the parameters of the particle-surface interaction from experimental data.

UR - http://www.scopus.com/inward/record.url?scp=33751583975&partnerID=8YFLogxK

U2 - 10.1063/1.2395935

DO - 10.1063/1.2395935

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AN - SCOPUS:33751583975

SN - 0021-9606

VL - 125

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

IS - 20

M1 - 204705

ER -