Capillary forces in tapping mode atomic force microscopy

L. Zitzler, S. Herminghaus, Friedrich Gunther Mugele

Research output: Contribution to journalArticle

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Abstract

We investigated the influence of the relative humidity on amplitude and phase of the cantilever oscillation while operating an atomic force microscope (AFM) in the tapping mode. If the free oscillation amplitude A0 exceeds a certain critical amplitude Ac, the amplitude- and phase-distance curves show a transition from a regime with a net attractive force between tip and sample to a net repulsive regime. For hydrophilic tip and sample this critical amplitude Ac is found to increase with increasing relative humidity. In contrast, no such dependence was found for hydrophobic samples. Numerical simulations show that this behavior can be explained by assuming the intermittent formation and rupture of a capillary neck in each oscillation cycle of the AFM cantilever.
LanguageUndefined
Pages155436
JournalPhysical review B: Condensed matter and materials physics
Volume66
Issue number15
DOIs
StatePublished - 2002

Keywords

  • IR-57256

Cite this

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Capillary forces in tapping mode atomic force microscopy. / Zitzler, L.; Herminghaus, S.; Mugele, Friedrich Gunther.

In: Physical review B: Condensed matter and materials physics, Vol. 66, No. 15, 2002, p. 155436.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Capillary forces in tapping mode atomic force microscopy

AU - Zitzler,L.

AU - Herminghaus,S.

AU - Mugele,Friedrich Gunther

PY - 2002

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AB - We investigated the influence of the relative humidity on amplitude and phase of the cantilever oscillation while operating an atomic force microscope (AFM) in the tapping mode. If the free oscillation amplitude A0 exceeds a certain critical amplitude Ac, the amplitude- and phase-distance curves show a transition from a regime with a net attractive force between tip and sample to a net repulsive regime. For hydrophilic tip and sample this critical amplitude Ac is found to increase with increasing relative humidity. In contrast, no such dependence was found for hydrophobic samples. Numerical simulations show that this behavior can be explained by assuming the intermittent formation and rupture of a capillary neck in each oscillation cycle of the AFM cantilever.

KW - IR-57256

U2 - 10.1103/PhysRevB.66.155436

DO - 10.1103/PhysRevB.66.155436

M3 - Article

VL - 66

SP - 155436

JO - Physical review B: Condensed matter and materials physics

T2 - Physical review B: Condensed matter and materials physics

JF - Physical review B: Condensed matter and materials physics

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