Hydrodynamics of torsional probes for atomic force microscopy in liquids

Sudipta Basak, Arthur Beyder, Chiara Spagnoli, Arvind Raman, Fredrick Sachs

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Abstract

Improving the force resolution of atomic force microscopy for soft samples in liquid requires soft cantilevers with reduced hydrodynamic cross section. Single and dual axis torsion levers [Beyder and Sachs, 2006] are an attractive technology. They have reduced area and reduced drift due to the symmetric support [Beyder, 2006] can add a second dimension using two independent axes. Here we investigate the hydrodynamics of these probes using three-dimensional transient fluid-structure interaction models with comparison to the experimental data. The computed Q factors and wet/dry resonance frequencies of different modes compare well with experimental measurements indicating that continuum viscous hydrodynamics can be used effectively to predict probe performance. The modeling further explores cross-axis hydrodynamic coupling and the influence of a nearby sample plane to provide guidance on approach algorithms and the possibilities of parametric detection.

Original languageEnglish (US)
Article number024914
JournalJournal of Applied Physics
Volume102
Issue number2
DOIs
StatePublished - Aug 7 2007

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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