%0 Journal Article
%A Harrold, Victoria C.
%A Paven, Maxime
%A Vollmer, Doris
%A Sharp, James S.
%D 2016
%T Rheological Properties of Viscoelastic Drops on Superamphiphobic
Substrates
%U https://acs.figshare.com/articles/journal_contribution/Rheological_Properties_of_Viscoelastic_Drops_on_Superamphiphobic_Substrates/3171913
%R 10.1021/acs.langmuir.6b00779.s001
%2 https://acs.figshare.com/ndownloader/files/4939603
%K measurement
%K refracting laser light
%K rheological properties
%K photodiode
%K vibration
%K solution
%K frequency
%X 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 (G′ and G″, 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.
%I ACS Publications