Colloidal dynamics in polymer solutions: Optical two-point microrheology measurements

Details Colloidal dynamics in polymer solutions: Optical two-point microrheology measurements Colloidal dynamics in polymer solutions: Optical two-point microrheology measurements

2002-05-15

arxiv.org/abs/cond-mat/0205309v2

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We present an extension of the two-point optical microrheology technique introduced by Crocker \textit{et al.} [Phys. Rev. Lett. \textbf{85}, 888 (2000)] to high frequencies. The correlated fluctuations of two probe spheres held by a pair of optical tweezers within a viscoelastic medium are determined using optical interferometry. A theoretical model is developed to yield the frequency-dependent one- and two-particle response functions from the correlated motion. We demonstrate the validity of this method by determining the one- and two-particle correlations in a semi-dilute solution of polystyrene in decalin. We find that the ratio of the one- and two-particle response functions is anomalous which we interpret as evidence for a slip boundary condition caused by depletion of polymer from the surface of the particle.

Affiliated with

Also associated with

No associations

Rating

Colloidal dynamics in polymer solutions: Optical two-point microrheology measurements does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Colloidal dynamics in polymer solutions: Optical two-point microrheology measurements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Colloidal dynamics in polymer solutions: Optical two-point microrheology measurements will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-489091