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Title: Material property analytical relations for the case of an AFM probe tapping a viscoelastic surface containing multiple characteristic times

Journal Article · · Beilstein Journal of Nanotechnology
 [1];  [1]
  1. George Washington Univ., Washington, DC (United States). Dept. of Mechanical and Aerospace Engineering

We explore the contact problem of a flat-end indenter penetrating intermittently a generalized viscoelastic surface, containing multiple characteristic times. This problem is especially relevant for nanoprobing of viscoelastic surfaces with the highly popular tapping-mode AFM imaging technique. By focusing on the material perspective and employing a rigorous rheological approach, we deliver analytical closed-form solutions that provide physical insight into the viscoelastic sources of repulsive forces, tip-sample dissipation and virial of the interaction. We also offer a systematic comparison to the well-established standard harmonic excitation, which is the case relevant for dynamic mechanical analysis (DMA) and for AFM techniques where tip–sample sinusoidal interaction is permanent. This comparison highlights the substantial complexity added by the intermittent-contact nature of the interaction, which precludes the derivation of straightforward equations as is the case for the well-known harmonic excitations. The derivations offered have been thoroughly validated through numerical simulations. Despite the complexities inherent to the intermittent-con-tact nature of the technique, the analytical findings highlight the potential feasibility of extracting meaningful viscoelastic properties with this imaging method.

Research Organization:
George Washington Univ., Washington, DC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0011912
OSTI ID:
1502935
Journal Information:
Beilstein Journal of Nanotechnology, Vol. 8; ISSN 2190-4286
Publisher:
Beilstein InstituteCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (5)

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Acquisition of time–frequency localized mechanical properties of biofilms and single cells with high spatial resolution journal January 2019
Imaging of viscoelastic soft matter with small indentation using higher eigenmodes in single-eigenmode amplitude-modulation atomic force microscopy journal January 2018
Acquisition of time-frequency localized mechanical properties of biofilms and single cells with high spatial resolution preprint January 2019
Theory of Single-Impact Atomic Force Spectroscopy in liquids with material contrast journal May 2018