Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: POSTER: Micro and Nano Fluidics

CPP 19.1: Poster

Wednesday, March 28, 2007, 16:00–18:30, Poster B

Cantilever micro rheometer for measurement of sugar solutions — •Marc Hennemeyer and Robert Stark — Dept. Geo und Umwelt, Ludwig-Maximilians-Universität, Theresienstr. 41, 80333 München

Measurement of rheological properties of liquids is of high interest in many areas like medicine and biology. As traditional measurement techniques require relatively big amounts of sample fluid, the last years have seen an increased interest in the miniaturization of measurement tools. Micro mechanical sensors as used in atomic force microscopy are ideally suited as sensors in micro fluidic devices. Although the vibration of cantilevers does not respond to viscosity changes of fluids on macroscopic scales, micrometer scaled plates are affected by the viscous properties of the surrounding fluids. In this work a simple measurement tool for the rheological measurements on arbitrary Newtonian liquids is presented which is based on the analysis of stochastic cantilever oscillations. The system can be operated with standard consumer computer hardware, which dramatically reduces the costs for the system. The system presented in this work is a very cost effective set up that can be used for a wide range of experiments in cost sensitive environments. It could be shown, that for viscosity measurements on basis of the method introduced by Sader, standard computer hardware can be used to substitute expensive data acquisition hardware. The measurements on sugar solutions could evaluate the viscosity and density of the solutions to an accuracy of about 10%.