Measuring storage and loss moduli using optical tweezers: broadband microrheology.
We present an experimental procedure to perform broadband microrheological measurements with optical tweezers. A generalized Langevin equation is adopted to relate the time-dependent trajectory of a particle in an imposed flow to the frequency-dependent moduli of the complex fluid. This procedure allows us to measure the material linear viscoelastic properties across the widest frequency range achievable with optical tweezers.
Tassieri
Manlio
M
Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8LT, UK. m.tassieri@elec.gla.ac.uk
Gibson
Graham M
GM
Evans
R M L
RM
Yao
Alison M
AM
Warren
Rebecca
R
Padgett
Miles J
MJ
Cooper
Jonathan M
JM