Identification of Nanoscale Dissipation Processes by Dynamic Atomic Force Microscopy

García, Ricardo García; Gómez, César Cinesi; Martínez, Nicolás; Patil, Shivprasad; Dietz, Christian; Magerle, R.

doi:10.1103/physrevlett.97.016103

Cited by 290 publications

(418 citation statements)

References 32 publications

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“…The shape and amplitude of the force-displacement curves as well as the corresponding values of the dissipation energies consequence of the viscoelastic behavior of the amorphous polymer predicted by our simulations are in good agreement with continuum model of dynamic AFM 15,48 and experiments. 11 In our analysis, we characterize how surface topography and sub-surface phases affect the local properties of the surface extracted from the force-displacement curves.…”

Section: Resultssupporting

confidence: 70%

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Molecular dynamic simulation of tip-polymer interaction in tapping-mode atomic force microscopy

Venturini

Strachan

2013

Journal of Applied Physics

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We present a molecular dynamic study of the interaction between an amorphous silica tip (SiO 2 ) and an amorphous poly-(methyl-methacrylate) substrate under conditions relevant for tapping-mode atomic force microscopy. To capture the actual dynamics of the tip, we use the dynamic contact simulation method [Kim et al., J. Appl. Phys. 112, 094325 (2012)]. We obtain force-displacement relationships both for neat polymer substrates and a sample with a sub-surface nanotube and extract the local stiffness and energy dissipation per cycle. The simulations capture non-trivial aspects of the interaction that originate from the viscoelastic nature of the polymer including an increase in repulsive interaction force during approach with tip velocity and an increase in adhesion during retraction with decreasing tip velocity. Scans of local stiffness and dissipation over the samples reveal intrinsic variability in the amorphous polymer but also the effect of local surface topography on the extracted properties as well as the ability of the method to detect a sub-surface nanotube. This insight and quantitative data should be valuable to interpret the results of atomic force microscopy studies. V C 2013 AIP Publishing LLC. [http://dx

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Section: Resultssupporting

confidence: 70%

“…The magnitude of the dissipation energy compute in this work is in good agreement with experiments. 48 The analysis of the local Young's modulus will be presented below and will include a larger range of data points.…”

Section: Force-displacement Curves and Local Propertiesmentioning

confidence: 99%

Molecular dynamic simulation of tip-polymer interaction in tapping-mode atomic force microscopy

Venturini

Strachan

2013

Journal of Applied Physics

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“…In these conditions the interpretation of the phase signal is not straightforward, but often dominated by the contact mechanic between the tip and the sample, and hence variations in stiffness and viscosity of the material. 40,43,44 Most of the experiments, in particular the results presented in Figures First images were acquired in air to estimate the surface coverage of organic molecules. The desired brine was subsequently injected into the fluid cell and the sample imaged in liquid without changing the tip.…”

Section: Imaging Conditions Used For the Am-afm Experimentsmentioning

confidence: 99%

Growth and Dissolution of Calcite in the Presence of Adsorbed Stearic Acid

Ricci¹,

Segura²,

Erickson³

et al. 2015

Langmuir

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The interaction of organic molecules with the surface of calcite plays a central role in many geochemical, petrochemical and industrial processes and in biomineralization. Adsorbed organics, typically fatty acids, can interfere with the evolution of calcite when immersed in aqueous solutions. Here we use atomic force microscopy in liquid to explore in real-time the evolution of the (101 ത 4) surface of calcite covered with various densities of stearic acid and exposed to different saline solutions. Our results show that the stearic acid molecules tend to act as 'pinning points' on the calcite's surface and slow down the crystal's restructuring kinetics. Depending on the amount of material adsorbed, the organic molecules can form monolayers or bilayer islands that become embedded into the growing crystal. The growth process can also displaces the organic molecules and actively concentrate them into stacked multilayers. Our results provide molecular-level insights into the interplay between the adsorbed fatty acid molecules and the evolving calcite crystal, highlighting mechanisms that could have important implications for several biochemical and geochemical processes and for the oil industry.

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“…Nonconservative tip-sample interaction forces of the form F tsnc (d,ḋ, m) dissipate mechanical energy of the probe upon interaction. Nonconservative forces typically encountered in dAFM include viscoelastic forces of the form F tsnc (d,ḋ), hysteretic adhesion forces of the form F tsnc (d, m), or combinations of the two (15). Common hysteretic forces in liquids include specific bond-forming/-breaking between a functionalized tip and complimentary molecule on the surface (16), or hysteretic adhesion between the tip and a highly adhesive soft surface predicted by the Johnson-Kendal-Roberts (JKR) theory (17).…”

Section: Theoretical Considerationsmentioning

confidence: 99%

Origins of phase contrast in the atomic force microscope in liquids

Melcher

Carrasco

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

109

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We study the physical origins of phase contrast in dynamic atomic force microscopy (dAFM) in liquids where low-stiffness microcantilever probes are often used for nanoscale imaging of soft biological samples with gentle forces. Under these conditions, we show that the phase contrast derives primarily from a unique energy flow channel that opens up in liquids due to the momentary excitation of higher eigenmodes. Contrary to the common assumption, phase-contrast images in liquids using soft microcantilevers are often maps of short-range conservative interactions, such as local elastic response, rather than tip-sample dissipation. The theory is used to demonstrate variations in local elasticity of purple membrane and bacteriophage φ29 virions in buffer solutions using the phase-contrast images.atomic force microscopy | liquid environments | energy dissipation | higher eigenmodes | momentary excitation D ynamic atomic force microscopy (dAFM) is an essential experimental tool for the study of conservative and dissipative forces on surfaces at nanometer length scales, which has major implications for the physics of biomolecular interactions, chemical bond kinetics, adhesion, wetting and capillary action, friction and elasticity on material surfaces (1, 2). dAFM techniques have been developed to distinguish between dissipative (friction, viscoelastic, bond breaking, surface hysteresis, capillary condensation) and conservative (elastic, magnetic, electrostatic) forces between a sharp oscillating tip and the surface. In amplitude-modulated AFM (AM-AFM) phase-contrast imaging, the variation in the phase of the oscillating probe tip with respect to the drive signal is mapped over the sample. For the past decade phase contrast has been intimately connected with variation in tip-sample dissipation over the sample (2-6). Phase-contrast imaging is widely recognized as perhaps the most important AM-AFM mode for the measurement of compositional contrast.The connection between phase contrast and tip-sample dissipation rests on the assumption that the cantilever dynamics can be modeled by a single eigenmode (point-mass) oscillator. With this assumption, the tip-sample dissipation can be equated to the difference between work input to the oscillator and energy dissipated into a surrounding viscous medium (4, 5). This theory forms the bedrock upon which phase-contrast imaging is currently based, at least under ambient and vacuum conditions. dAFM is now a well-known and broadly extended technique for nanoscale imaging and force spectroscopy in the biology community (7-10). Because the natural medium for the study of biological samples is liquid, it is of fundamental importance to develop a proper description of the different working modes of dAFM when the probe and sample are immersed in liquids. In particular, there is little work on understanding the origins of phase contrast in liquids (6) where soft cantilevers (stiffness 1 N/m) with low-quality factors (Q 5) are routinely used for the imaging of soft biological samples. It is im...

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Identification of Nanoscale Dissipation Processes by Dynamic Atomic Force Microscopy

Cited by 290 publications

References 32 publications

Molecular dynamic simulation of tip-polymer interaction in tapping-mode atomic force microscopy

Molecular dynamic simulation of tip-polymer interaction in tapping-mode atomic force microscopy

Growth and Dissolution of Calcite in the Presence of Adsorbed Stearic Acid

Origins of phase contrast in the atomic force microscope in liquids

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