Optical tweezers: wideband microrheology

Details Optical tweezers: wideband microrheology Optical tweezers: wideband microrheology

2010-05-09

arxiv.org/abs/1005.1401v1

Physics

Optics

13 pages, 6 figures, submitted to Special Issue of the Journal of Optics

Scientific paper

Microrheology is a branch of rheology having the same principles as conventional bulk rheology, but working on micron length scales and micro-litre volumes. Optical tweezers have been successfully used with Newtonian fluids for rheological purposes such as determining fluid viscosity. Conversely, when optical tweezers are used to measure the viscoelastic properties of complex fluids the results are either limited to the material's high-frequency response, discarding important information related to the low-frequency behavior, or they are supplemented by low-frequency measurements performed with different techniques, often without presenting an overlapping region of clear agreement between the sets of results. We present a simple experimental procedure to perform microrheological measurements over the widest frequency range possible with optical tweezers. A generalised Langevin equation is used to relate the frequency-dependent moduli of the complex fluid to the time-dependent trajectory of a probe particle as it flips between two optical traps that alternately switch on and off.

Affiliated with

Also associated with

No associations

Rating

Optical tweezers: wideband microrheology 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 Optical tweezers: wideband microrheology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical tweezers: wideband microrheology will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-611972