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Long-range hydrodynamic forces in liquid FM-AFM

Abstract : We study the effects of hydrodynamic forces in frequency-modulation AFM experiments (FM-AFM) in liquid. We first establish the theoretical equations needed to derive the interaction stiffness k_int and the damping β_int due to the hydrodynamic forces from the frequency shift and the excitation amplitude. We develop specific FM-AFM experiments to measure the variation of k_int and β_int over a large range of distance in water up to 200 μm. Comparison between theory and experiments point out that the evolution of k_int at short and long distance arises from unsteady hydrodynamic forces on the cantilever. On the other hand, βint is small at long distance and diverges at short probe-surface distance, as predicted by the classical Reynolds sphere model.
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Submitted on : Friday, November 6, 2020 - 10:40:44 AM
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Clémence Devailly, Patrick Bouriat, Christophe Dicharry, Frédéric Risso, Thierry Ondarçuhu, et al.. Long-range hydrodynamic forces in liquid FM-AFM. Nanotechnology, Institute of Physics, 2020, 31 (45), pp.455501. ⟨10.1088/1361-6528/aba786⟩. ⟨hal-02991839⟩



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