%0 Journal Article
%T On the effect of local sample slope during modulus measurements by contact-resonance atomic force microscopy
%+ Laboratoire Charles Coulomb (L2C)
%+ Ingénierie des Agro-polymères et Technologies Émergentes (UMR IATE)
%+ Laboratoire de Mécanique et Génie Civil (LMGC)
%+ Bois (BOIS)
%+ Université de Montpellier (UM)
%A Heinze, K.
%A Arnould, Olivier
%A Delenne, Jean-Yves
%A Lullien-Pellerin, V.
%A Ramonda, M.
%A George, Matthieu
%< avec comité de lecture
%@ 0304-3991
%J Ultramicroscopy
%I Elsevier
%V 194
%P 78 - 88
%8 2018
%D 2018
%R 10.1016/j.ultramic.2018.07.009
%K AFM
%K Contact resonance
%K Surface slope
%K Nano-mechanics
%K Indentation modulus
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
%Z Engineering Sciences [physics]/Micro and nanotechnologies/MicroelectronicsJournal articles
%X Contact-resonance atomic force microscopy (CR-AFM) is of great interest and very valuable for a deeper understanding of the mechanics of biological materials with moduli of at least a few GPa. However, sample surfaces can present a high topography range with significant slopes, where the local angle can be as large as ± 50°. The non-trivial correlation between surface slope and CR-frequency hinders a straightforward interpretation of CR-AFM indentation modulus measurements on such samples. We aim to demonstrate the significant influence of the surface slope on the CR-frequency that is caused by the local angle between sample surface and the AFM cantilever and present a practical method to correct the measurements. Based on existing analytical models of the effect of the AFM set-up's intrinsic cantilever tilt on CR-frequencies, we compute the non-linear variation of the first two (eigen)modes CR-frequency for a large range of surface angles. The computations are confirmed by CR-AFM experiments performed on a curved surface. Finally, the model is applied to directly correct contact modulus measurements on a durum wheat starch granule as an exemplary sample.
%G English
%2 https://hal.science/hal-01869770/document
%2 https://hal.science/hal-01869770/file/Art_Arnould_al_Ultramicroscopy_2018.pdf
%L hal-01869770
%U https://hal.science/hal-01869770
%~ CIRAD
%~ CNRS
%~ UNIV-MONTP2
%~ INRA
%~ IATE
%~ LMGC
%~ L2C
%~ AGREENIUM
%~ MIPS
%~ BA
%~ UNIV-MONTPELLIER
%~ INSTITUT-AGRO-MONTPELLIER
%~ INRAE
%~ INRAEOCCITANIEMONTPELLIER
%~ ANR
%~ UM-2015-2021
%~ INSTITUT-AGRO