High speed indentation measures by FV, QI and QNM introduce a new understanding of bionanomechanical experiments

Abstract : Structural and mechanical mapping at the nanoscale by novel high-speed multiparametric Quantitative Imaging (QI) and PeakForce Quantitative Nanomechanical Mapping (PF-QNM) AFM modes was compared to the classical Force Volume (FV) mapping for the case of living Pseudomonas aeruginosa bacterial cells. QI and PF-QNM modes give results consistent with FV for the whole cells in terms of morphology and elastic modulus, while providing higher resolution and shorter acquisition time. As an important complement, the influence of scanning parameters on elastic modulus values was explored for small 0.2 2 m 2 central area on top of cells. The modulus decreases with the indentation depth due to the effect of the hard cell wall, while it increases vs. tip oscillation frequency, displaying viscoelastic behaviour of the living bacterial cells. The ability of different AFM modes to follow correctly the bacteria viscoelastic behaviour at high oscillation frequency was tested.
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Soumis le : jeudi 22 novembre 2018 - 18:49:02
Dernière modification le : mardi 27 novembre 2018 - 01:22:36

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Georges Smolyakov, Cécile Formosa-Dague, Childérick Severac, Raphael Duval, Etienne Dague. High speed indentation measures by FV, QI and QNM introduce a new understanding of bionanomechanical experiments. Micron, Elsevier, 2016, 85, pp.8-14. 〈10.1016/j.micron.2016.03.002〉. 〈hal-01552823〉

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