Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Micro and Nano Fluidics II: Soft Objects in Flow + Slippage

CPP 24.4: Vortrag

Donnerstag, 29. März 2007, 10:30–10:45, H37

Determination of density, viscosity and activation energy of small liquid volumes using an atomic force microscope — •Neal McLoughlin, Stephen Lee, and Georg Hähner — EaStCHEM School of Chemistry and SUPA School of Physics; University of St Andrews; St Andrews KY16 9ST UK

We demonstrate that the viscosity and density of small liquid volumes can be determined with good precision from the resonance spectra of both magnetically driven and thermally excited AFM cantilevers. Recording spectra depending on the temperature allows for the determination of activation energy values. Data recorded in water were employed to extract parameters characteristic of the resonance behaviour of the system. These parameters were then used to determine the properties of further liquid samples. The method we present is fast and reliable and does not require a calibration of the force constant of the cantilever or knowledge of its geometry. It can be performed with commercial instruments and has the potential to be incorporated in microfluidic systems [1].

N. McLoughlin, S. L. Lee, G. Hähner Appl. Phys. Lett. 89, 184106 (2006)