10.1021/acs.langmuir.6b00779.s001
Victoria
C. Harrold
Victoria C.
Harrold
Maxime Paven
Maxime
Paven
Doris Vollmer
Doris
Vollmer
James S. Sharp
James S.
Sharp
Rheological Properties of Viscoelastic Drops on Superamphiphobic
Substrates
American Chemical Society
2016
measurement
refracting laser light
rheological properties
photodiode
vibration
solution
frequency
2016-04-01 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Rheological_Properties_of_Viscoelastic_Drops_on_Superamphiphobic_Substrates/3171913
The
rheological properties of microliter sized drops of polymer
solutions were investigated using measurements of their mechanical
vibrational response. Drops were suspended on superamphiphobic substrates
and vibrated by the application of a short mechanical impulse. Surface
vibrations were monitored by refracting laser light through the drops
and focusing the refracted light onto the surface of a photodiode.
Time dependent variations in the photodiode output were Fourier transformed
to obtain the frequency and spectral width of the mechanical resonances
of the drops. These quantities were related to the frequency dependent
shear storage and loss moduli (<i>G</i>′ and <i>G</i>″, respectively) using a simple theoretical model.
The resulting rheological properties were found to be in agreement
with microrheology measurements of the same solutions. Drop vibration
therefore provides a fast and accurate method of quantifying the rheological
properties of single drops.