title: Proposal and testing of dual-beam dynamic light scattering for two-particle microrheology.
abstract: A dual-beam dynamic light-scattering arrangement is devised to measure the time-dependent mean squared relative displacement of a pair of tracer particles with a small separation of micrometers. The technique is tested by the measurement of the relative diffusion of polymer latex spheres suspended in a simple viscous fluid. The experiment verifies the theory and demonstrates its applications. The dual-beam dynamic light-scattering technique, when combined with an optical microscope, provides a powerful tool for the study of two-particle microrheology of soft materials. The advantages of the new technique are its high statistical accuracy, faster temporal response, and ease of use.
authors.affiliation: Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
authors.forename: Xin-Liang
authors.initials: XL
authors.lastname: Qiu
authors.forename: Penger
authors.initials: P
authors.lastname: Tong
authors.forename: Bruce J
authors.initials: BJ
authors.lastname: Ackerson