2011
DOI: 10.1103/physreve.84.031306
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Tailoring the frictional properties of granular media

Abstract: A method of modifying the roughness of soda-lime glass spheres is presented, with the purpose of tuning inter-particle friction. The effect of chemical etching on the surface topography and the bulk frictional properties of grains is systematically investigated. The surface roughness of the grains is measured using white light interferometry and characterised by the lateral and vertical roughness length scales. The underwater angle of repose is measured to characterise the bulk frictional behaviour. We observe… Show more

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Cited by 17 publications
(20 citation statements)
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“…Unfortunately, it is rather difficult experimentally to quantitatively characterize or tune the frictional interactions between the particles [17] or between particles and container walls. The connection between friction and particle dynamics is therefore unclear.…”
mentioning
confidence: 99%
“…Unfortunately, it is rather difficult experimentally to quantitatively characterize or tune the frictional interactions between the particles [17] or between particles and container walls. The connection between friction and particle dynamics is therefore unclear.…”
mentioning
confidence: 99%
“…Using Hertz law we can derive that this increase in pressure will deform the sphere by approximately 10 nm at each contact. This deformation is an order of magnitude smaller than the vertical surface roughness of typical glass spheres [53]. Assuming that the sphere is compressed symmetrically, this corresponds to a change in volume fraction of 7 × 10 −5 compared to the uncompressed sphere.…”
Section: The Volume Fraction Of Frictional Particles Is Controlled Bymentioning
confidence: 93%
“…However, coating surfaces with nanoparticles results in changes to the coefficient of friction, for example, the nanoparticle‐coating typically acts as a lubricant and reduces friction. Moreover, the fluid‐mechanical behavior of noncohesive granular materials in similar systems has shown sensitivity to the friction coefficient . Consequently, a change in coefficient of friction could have affected the aforementioned macro‐scale measurements of nanoparticle‐roughened surfaces.…”
Section: Introductionmentioning
confidence: 99%
“…Cohesion dominated by either van der Waals or capillary forces is isolated by varying the relative humidity ( RH ) of the system (discussed below). Moreover, instead of coating particles, the particle surfaces are smoothed via etching such that the coefficient of friction is not changed, and the effects of roughness on cohesion are isolated. Topography measurements of the particle surfaces are used to accurately characterize the resulting surface maps into roughness parameters .…”
Section: Introductionmentioning
confidence: 99%