Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: DRG-DPG SYMPOSIUM Rheology III
CPP 11.5: Vortrag
Dienstag, 26. Februar 2008, 11:15–11:30, C 264
Bridging the gap between microrheology and tribology — •Christian Clasen1, Pirouz Kavehpour2, and Gareth H. McKinley3 — 1Department of Chemical Engineering, Katholieke Universiteit Leuven (KUL), 3001 Leuven, Belgium — 2Mechanical and Aerospace Engineering Department, University of California Los Angeles (UCLA), Los Angeles, CA90095, USA — 3Department of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
Tribology and elastohydrodynamic lubrication have traditionally been considered to be a subject apart from classical bulk rheology and the rapidly developing area of microrheological investigation. The principal reason for this separation is that although fluid properties in each field are key to the observed flow and friction phenomena, the experimental approach and the resulting terminology differ substantially and prohibit a direct translation of the results. In particular the lack of well-defined viscometric kinematics for tribological experiments and the difficulties in achieving sufficiently-precise fixture alignment in regular rheometry on the microscale have inhibited the merging of the results from these fields.
We show in this paper how recent developments in the area of sliding plate microrheometers with controlled gaps on the order of micro- to nanometers, and triborheometers with defined plate-and-plate geometry parameters and normal stress control can bridge this gap between classical tribology and rheology.