TY - JOUR
T1 - Hydrodynamic Mobility of an Optically Trapped Colloidal Particle near Fluid-Fluid Interfaces
AU - Wang, G. M.
AU - Prabhakar, R.
AU - Sevick, E. M.
PY - 2009/12/8
Y1 - 2009/12/8
N2 - Using optical tweezers, we measure the anisotropic hydrodynamic mobility of a colloidal particle by tracking its thermal motion in an optical trap located near fluid-fluid interfaces, namely, liquid-vapor and liquid-liquid interfaces. The method requires no controlled fluid flow, is independent of conservative interactions between particle and interface, and resolves distance dependent friction to within a fraction of the particle radius. Near the liquid-vapor interface, the friction decreases below that in the bulk, corresponding to predictions of a "perfect-slip" surface.
AB - Using optical tweezers, we measure the anisotropic hydrodynamic mobility of a colloidal particle by tracking its thermal motion in an optical trap located near fluid-fluid interfaces, namely, liquid-vapor and liquid-liquid interfaces. The method requires no controlled fluid flow, is independent of conservative interactions between particle and interface, and resolves distance dependent friction to within a fraction of the particle radius. Near the liquid-vapor interface, the friction decreases below that in the bulk, corresponding to predictions of a "perfect-slip" surface.
UR - http://www.scopus.com/inward/record.url?scp=71549151321&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.103.248303
DO - 10.1103/PhysRevLett.103.248303
M3 - Article
SN - 0031-9007
VL - 103
JO - Physical Review Letters
JF - Physical Review Letters
IS - 24
M1 - 248303
ER -