Force Microscopy Study of Friction and Elastic Compliance of Phase-Separated Organic Thin Films

Overney, René M.; Meyer, Ernst; Frommer, Jane; Güntherodt, H.‐J.; Fujihira, Masamichi; Takano, Hajime; Gotoh, Yasuo

doi:10.1021/la00016a049

Cited by 261 publications

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“…1 Nevertheless, only very few AFM studies have investigated hardness or elasticity dependence of friction forces. 5,6 Friction forces are proportional to the contact area, thus, it is intuitive that a more compliant material, into which the AFM tip is likely to penetrate deeper, yields a higher friction force. Following the theory of Bowden and Tabor, 7 the friction force F F can be expressed as…”

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confidence: 99%

“…9,10 This is one of the reasons why even in wearless and single asperity contact experiments it is not trivial to relate friction forces to the Young modulus of the material investigated. 5 In this letter, we study sliding friction forces between a Si AFM tip and diamond, diamond-like carbon ͑DLC͒, and CrN thin films, i.e., materials used in industry as hard coatings. 2,11 We demonstrate that the variations of the friction coefficient in CrN films grown at different temperatures can fully be explained in terms of the different Young moduli.…”

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Young modulus dependence of nanoscopic friction coefficient in hard coatings

Brune¹

2003

Applied Physics Letters

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We present an atomic force microscope study of nanoscopic sliding friction on diamond, diamond-like carbon, and on three CrN thin films with varying hardness obtained by different growth temperatures. For the CrN films, we show that the changes in the friction coefficient can be traced back to variations of the Young modulus. More generally, we show for all samples investigated and in wearless regime, that the nanoscopic friction coefficient is directly linked to the Young modulus.

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confidence: 99%

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Young modulus dependence of nanoscopic friction coefficient in hard coatings

Brune¹

2003

Applied Physics Letters

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“…There are two different working regimes: below the cantilever resonance frequency (at low frequencies N 10 kHz) or well above it at high frequencies (between ~ 100 kHz and 1 MHz). The low frequency regime also called "the force modulation mode", is well-adapted to soft materials such as biological ones [16,17]. Measurement of the signal amplitude and phase gives the elasticity and viscosity response of the material, respectively [17].…”

Section: Resultsmentioning

confidence: 99%

A Scanning Force Microscope Combined with a Scanning Electron Microscope for Multidimensional Data Analysis

Troyon¹,

Lei²,

Wang³

et al. 1997

Microsc. Microanal. Microstruct.

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“…In polymer films, including protein, Overney et al described the friction due to stretching the protruded chain segment, which causes sawtooth patterns in lateral profiles [67]. Stretching of the long molecules is a major origin of friction especially for elastomers [32,37], synthetic polymers [68] and various protein films [35,36].…”

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confidence: 99%

Direct Observation of Amyloid Nucleation under Nanomechanical Stretching

et al. 2013

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Self-assembly of amyloid nanofiber is associated with functional and pathological processes such as in neurodegenerative diseases. Despite intensive studies, stochastic nature of the process has made it difficult to elucidate molecular mechanisms for the key amyloid nucleation. Here, we investigated the amyloid nucleation of silk-elastinlike peptide (SELP) using time-lapse lateral force microscopy (LFM). By repeated scanning a single line on a SELP-coated mica surface, we observed sudden stepwise height increases, corresponds to nucleation of an amyloid fiber. The lateral force profiles followed either a worm-like chain model or an exponential function, suggesting that the atomic force microscopy (AFM) tip stretches a single or multiple SELP molecules along the scanning direction, serves as the template for further selfassembly perpendicular to the scan direction. Such mechanically induced nucleation of amyloid fibrils allows positional and directional control of amyloid assembly in vitro, which we demonstrate by generating single nanofibers at predetermined nucleation sites.

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Force Microscopy Study of Friction and Elastic Compliance of Phase-Separated Organic Thin Films

Cited by 261 publications

References 0 publications

Young modulus dependence of nanoscopic friction coefficient in hard coatings

Young modulus dependence of nanoscopic friction coefficient in hard coatings

A Scanning Force Microscope Combined with a Scanning Electron Microscope for Multidimensional Data Analysis

Direct Observation of Amyloid Nucleation under Nanomechanical Stretching

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