Chemical Origins of Frictional Aging

Liu, Y.; Szlufarska, Izabela

doi:10.1103/physrevlett.109.186102

Cited by 94 publications

(175 citation statements)

References 38 publications

Supporting

Mentioning

157

Contrasting

Order By: Relevance

“…Specific mechanisms responsible for this chemical aging have been subsequently proposed by Liu and Szlufarska based on the results of atomistic simulations [30]. The authors excluded the hypotheses that the chemical aging observed in the AFM experiments of Li et al [5] was due to meniscus formation or due to formation of a hydrogen bond network, as the time scales for these processes were significantly shorter than the aging time measured in experiments.…”

Section: Introductionmentioning

confidence: 75%

“…In AFM experiments, chemical bonding of silica/silica interfaces was reported to occur on the time scale of 0.1-100 s [5,30]. This time scale is too long for interfacial reactions to be modeled directly in MD simulations.…”

Section: Simulation Methodsmentioning

confidence: 99%

“…DV act is assumed to be constant in our system, which is justified based on published density functional theory calculations for siloxane bridge formation at silica/silica interface (see Supplemental Information in Ref [30] ) and by experimental measurements of sliding friction at other interfaces [38] [39]. As shown by Eq.…”

Section: Dependence Of Static Friction F S On the Number Of Interfacimentioning

confidence: 99%

“…Friction studies were not reported in Ref. [30], and it was hypothesized that the static friction force scales linearly with the number of covalent bonds formed across the interface. This assumption has been shown to be valid before for friction between a hydrogenpassivated DLC AFM tip and hydrogen-passivated diamond sample [31,32].…”

Section: Introductionmentioning

confidence: 99%

“…The authors of Ref. [30] employed a combination of density functional theory calculations, MD simulations based on empirical potentials, and kinetic Monte Carlo method to show that the concentration of siloxane bridges increases logarithmically with time on the time scales comparable to the aging time reported from AFM experiments. The authors also found that the energy barriers to formation of interfacial siloxane bridges on the neighboring sites are not independent of each other and that this interaction is mediated by the elastic deformation of the surrounding bulk.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of Interfacial Bonding on Friction and Wear at Silica/Silica Interfaces

Liu

Szlufarska

2014

Tribol Lett

Self Cite

View full text Add to dashboard Cite

Static friction between amorphous silica surfaces with a varying number of interfacial siloxane (Si-O-Si) bridges was studied using molecular dynamic simulations. Static friction was found to increase linearly with the applied normal pressure, which can be explained in the framework of Prandlt-Tomlinson's model. Friction force was found to increase with concentration of siloxane bridges, but with a decreasing gradient, with the latter being due to interactions between neighboring siloxane bridges. In addition, we identified atomic-level wear mechanisms of silica. These mechanisms include both transfer of individual atoms accompanied by breaking interfacial siloxane bridges and transfer of atomic cluster initialized by rupturing of surface Si-O bonds. Our simulations showed that small clusters are continually formed and dissolved at the sliding interface, which plays an important role in wear at silica/silica interface.

show abstract

Section: Introductionmentioning

confidence: 75%

Section: Simulation Methodsmentioning

confidence: 99%

Section: Dependence Of Static Friction F S On the Number Of Interfacimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of Interfacial Bonding on Friction and Wear at Silica/Silica Interfaces

Liu

Szlufarska

2014

Tribol Lett

Self Cite

View full text Add to dashboard Cite

show abstract

Does fault strengthening in laboratory rock friction experiments really depend primarily upon time and not slip?

2017

View full text Add to dashboard Cite

The popular constitutive formulations of rate‐and‐state friction offer two end‐member views on whether friction evolves only with slip (Slip law) or with time even without slip (Aging law). While rate stepping experiments show support for the Slip law, laboratory‐observed frictional behavior near zero slip rates has traditionally been inferred as supporting Aging law style time‐dependent healing, in particular, from the slide‐hold‐slide experiments of Beeler et al. (1994). Using a combination of new analytical results and explicit numerical (Bayesian) inversion, we show instead that the slide‐hold‐slide data of Beeler et al. (1994) favor slip‐dependent state evolution during holds. We show that, while the stiffness‐independent rate of growth of peak stress (following reslides) with hold duration is a property shared by both the Aging and (under a more restricted set of parameter combinations) Slip laws, the observed stiffness dependence of the rate of stress relaxation during long holds is incompatible with the Aging law with constant rate‐state parameters. The Slip law consistently fits the evolution of the stress minima at the end of the holds well, whether fitting jointly with peak stresses or otherwise. But neither the Aging nor Slip laws fit all the data well when a − b is constrained to values derived from prior velocity steps. We also attempted to fit the evolution of stress peaks and minima with the Kato‐Tullis hybrid law and the shear stress‐dependent Nagata law, both of which, even with the freedom of an extra parameter, generally reproduced the best Slip law fits to the data.

show abstract

Contact Aging Enhances Adhesion of Micropatterned Silicone Adhesives to Glass Substrates

Thiemecke

Hensel

2020

Adv Funct Materials

View full text Add to dashboard Cite

The transfer of biological concepts into synthetic micropatterned adhesives has recently enabled a new generation of switchable, reversible handling devices. Over the last two decades, many design principles have been explored that helped to understand the underlying mechanics and to optimize such adhesives for certain applications. An aspect that has been overlooked so far is the influence of longer hold times on the adhesive contacts. Exemplarily, the pull-off stress and work of separation of a micropatterned adhesive specimen are enhanced by factors 3 and 6, respectively, after 1000 min in contact with a glass substrate. In addition to such global measures, the increase of adhesion of all individual micropillars is analyzed. It is found that contact aging varied across the microarray, as it drastically depends on local conditions. Despite great differences on the micropillar scale, the adhesion of entire specimens increased with very similar power laws, as this is determined by the mean contact ageing of the individual structures. Overall, contact aging must be critically evaluated before using micropatterned adhesives, especially for long-term fixations and material combinations that are chemically attractive to each other.

show abstract

Chemical Origins of Frictional Aging

Cited by 94 publications

References 38 publications

Effects of Interfacial Bonding on Friction and Wear at Silica/Silica Interfaces

Effects of Interfacial Bonding on Friction and Wear at Silica/Silica Interfaces

Does fault strengthening in laboratory rock friction experiments really depend primarily upon time and not slip?

Contact Aging Enhances Adhesion of Micropatterned Silicone Adhesives to Glass Substrates

Contact Info

Product

Resources

About