Title:
Nonlinear Viscoelastic Dynamics of Nanoconfined Wetting Liquids
Nonlinear Viscoelastic Dynamics of Nanoconfined Wetting Liquids
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Author(s)
Li, Tai-De
Riedo, Elisa
Riedo, Elisa
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Abstract
The viscoelastic dynamics of nanoconfined wetting liquids is studied by means of atomic force
microscopy. We observe a nonlinear viscoelastic behavior remarkably similar to that widely observed
in metastable complex fluids. We show that the origin of the measured nonlinear viscoelasticity in
nanoconfined water and silicon oil is a strain rate dependent relaxation time and slow dynamics. By
measuring the viscoelastic modulus at different frequencies and strains, we find that the intrinsic
relaxation time of nanoconfined water is in the range 0.1–0.0001 s, orders of magnitude longer than
that of bulk water, and comparable to the dielectric relaxation time measured in supercooled water at 170–
210 K.
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2008-03
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