Nanoscale Frictional Dissipation into Shear-Stressed Polymer Relaxations

Jansen, Lars; Schirmeisen, André; Hedrick, James L.; Lantz, Mark A.; Knoll, Armin; Cannara, Rachel J.; Gotsmann, Bernd

doi:10.1103/physrevlett.102.236101

Cited by 25 publications

(36 citation statements)

References 24 publications

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“…The peak height is approximately 1.5-2 times higher than the average friction signal away from the transition point, while the peak width is about 2-5 K. Results from further experiments reproduce these values. In contrast to published contact friction versus temperature results [25,26], our result shows a very sharp and distinct transformation behavior, as qualitatively expected from the spinodal theory. It should be noted that in our experiments inducing the phase transition always required multiple scanning of the sample surface.…”

Section: Experiment: Afm/ffm Friction On 1t-tascontrasting

confidence: 92%

Friction anomalies at first-order transition spinodals: 1T-TaS₂

et al. 2018

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Revealing phase transitions of solids through mechanical anomalies in the friction of nanotips sliding on their surfaces, a successful approach for continuous transitions, is still an unexplored tool for firstorder ones. Owing to slow nucleation, first-order structural transformations occur with hysteresis, comprised between two spinodal temperatures where, on both sides of the thermodynamic transition, one or the other metastable free energy branches terminates. The spinodal transformation, a collective one-shot event without heat capacity anomaly, is easy to trigger by a weak external perturbation. Here we show that even the gossamer mechanical action of an AFM-tip can locally act as a trigger, narrowly preempting the spontaneous spinodal transformation, and making it observable as a nanofrictional anomaly. Confirming this expectation, the CCDW-NCCDW first-order transition of the important layer compound 1T-TaS 2 is shown to provide a demonstration of this effect.

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Section: Experiment: Afm/ffm Friction On 1t-tascontrasting

confidence: 92%

Friction anomalies at first-order transition spinodals: 1T-TaS₂

et al. 2018

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“…Aside from the experimental difficulty of heating or cooling the tip-sample contact, the analysis will be complicated by the temperature dependence of other parameters, especially friction. The temperature dependence of friction can be substantial [49,50] and even non-monotonic [51,52] and thus will significantly alter the shear stresses acting at the interface. In addition, a large enough increase in temperature will cause softening of the mechanical properties of the tip/ sample materials, thus altering the geometry and stresses of the contact.…”

Section: Experimentally Demonstrating the Effect Of Temperature On Atmentioning

confidence: 99%

“…In addition, a large enough increase in temperature will cause softening of the mechanical properties of the tip/ sample materials, thus altering the geometry and stresses of the contact. Therefore, such a temperature study would ideally measure friction and wear concurrently, or be performed on a system where the temperature dependence of friction and mechanical properties is not strong, or has been determined previously such as for a silicon tip sliding over Si, SiO 2 , SiC, or NaCl [49][50][51][52][53].…”

Section: Experimentally Demonstrating the Effect Of Temperature On Atmentioning

confidence: 99%

On the Application of Transition State Theory to Atomic-Scale Wear

et al. 2010

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The atomic force microscope (AFM) tip is often used as a model of a single sliding asperity in order to study nanotribological phenomena including friction, adhesion, and wear. In particular, recent work has demonstrated a wear regime in which surface modification appears to occur in an atom-by-atom fashion. Several authors have modeled this atomic-scale wear behavior as a thermally activated bond breaking process. The present article reviews this body of work in light of concepts from formal transition state theory (also called reaction rate theory). It is found that this framework is viable as one possible description of atomic-scale wear, with impressive agreements to experimental trends found. However, further experimental work is required to fully validate this approach. It is also found that, while the Arrhenius-type equations have been widely used, there is insufficient discussion of or agreement on the specific atomic-scale reaction that is thermally activated, or its dependence on stresses and sliding velocity. Further, lacking a clear picture of the underlying mechanism, a consensus on how to measure or interpret the activation volume and activation energy is yet to emerge. This article makes suggestions for measuring and interpreting such parameters, and provides a picture of one possible thermally activated transition (in its initial, activated, and final states). Finally, directions for further experimental and simulation work are proposed for validating and extending this model and rationally interrogating the behavior of this type of wear.

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“…Under ambient conditions friction-velocity relations were found to depend on the temperature owing to the effect of capillary condensation [14]. In polymers, nanoscale friction strongly depends on the relaxation dynamics of the polymer chains close to the glass transition temperatures [15,16]. But, how does friction depend on temperature for a point-like contact on a hard surface, a fundamental model geometry?…”

Section: Introductionmentioning

confidence: 97%

Temperature Dependence of Friction at the Nanoscale: When the Unexpected Turns Normal

et al. 2010

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The dynamics of frictional motion have been studied for hundreds of years, yet many key aspects of these important processes are not understood. The main challenge in predicting frictional response is the complexity of highly non-equilibrium processes going on in any tribological contact. This includes the continuous detachment and reattachment of multiple microscopic junctions at the sliding interface, the kinetics of which are controlled by the interface temperature. Our experiments reveal a non-monotonic enhancement of dry nanoscale friction at cryogenic temperatures for different material classes. We propose a model that reproduces the experimental observations and shows that the peak in temperature dependence of friction emerges from two competing processes acting at the interface: the thermally activated formation as well as the rupturing of an ensemble of atomic contacts. Our experiments and simulations provide a direct link between the temperature and velocity dependencies of friction, thus offering a new conceptual framework to describe the dynamics of dry nanoscale friction.

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Nanoscale Frictional Dissipation into Shear-Stressed Polymer Relaxations

Cited by 25 publications

References 24 publications

Friction anomalies at first-order transition spinodals: 1T-TaS₂

Friction anomalies at first-order transition spinodals: 1T-TaS₂

On the Application of Transition State Theory to Atomic-Scale Wear

Temperature Dependence of Friction at the Nanoscale: When the Unexpected Turns Normal

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Nanoscale Frictional Dissipation into Shear-Stressed Polymer Relaxations

Cited by 25 publications

References 24 publications

Friction anomalies at first-order transition spinodals: 1T-TaS2

Friction anomalies at first-order transition spinodals: 1T-TaS2

On the Application of Transition State Theory to Atomic-Scale Wear

Temperature Dependence of Friction at the Nanoscale: When the Unexpected Turns Normal

Contact Info

Product

Resources

About

Friction anomalies at first-order transition spinodals: 1T-TaS₂

Friction anomalies at first-order transition spinodals: 1T-TaS₂