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Christian Clasen, H. Pirouz Kavehpour, Gareth H. McKinley
Bridging Tribology and Microrheology of Thin Films
Appl. Rheol. 20:4 (2010) 45049 (13 pages)
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An enhanced version of the flexure-based microgap rheometer (FMR) is described which enables rheological measurements
in steady state shearing flows of bulk fluid samples of PDMS with an absolute gap separation between the shearing surfaces
of 100 nm - 100 μmm. Alignment of the shearing surfaces to a parallelism better then 10-7
rad allows us to reliably measure
shear stresses at shear rates up to 104 s-1. At low rates and for shearing gaps < 5 mm the stress response is dominated by sliding
friction between the surfaces that is independent of the viscosity of the fluid and only determined by the residual particulate
phase (dust particles) in the fluid.This behaviour is similar to the boundary lubrication regime in tribology.The absolute
gap control of the FMR allows us to systematically investigate the flow behaviour at low degrees of confinement (gap separations
100 nm - 2 μm) that cannot be accessed with conventional (controlled normal load) tribological test protocols.
► Cite this publication as follows:
Clasen C, Kavehpour HP, McKinley GH: Bridging Tribology and Microrheology of Thin Films, Appl. Rheol. 20 (2010) 45049.
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