Friction between Individual Microcontacts

Ecke, Stefan; Butt, Hans‐Jürgen

doi:10.1006/jcis.2001.7959

Cited by 40 publications

(25 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fig. 4(b) shows that the pristine NCCs exhibit granular behavior: rigid-granule-like NCs are dislodged upon indentation, suggesting weak IPB, likely associated with van der Waals forces and/or capillary interactions [42][43][44][45]. Thus, although each SiO 2 NC is very hard and stiff, the as-assembled NCC is soft and compliant.…”

Section: Effect Of Ald Treatment On the Interparticle Bonding Strengthmentioning

confidence: 89%

“…Based on Eq. (3b) and H i = 30 MPa for the 289 nm NCC, the intrinsic shear resistance force of each NCJ is f i = 140 nN, suggesting capillary [48,49] and/or van der Waals forces [42][43][44][45]. In fact, Gallego-Gómez et al [7] found that a wet SiO 2 NCC is twice as hard as its dry counterpart, implying that the magnitudes of the capillary and van der Waals forces are similar for wet SiO 2 NCCs.…”

Section: Granular Behavior (Regimes I and Ii)mentioning

confidence: 92%

See 1 more Smart Citation

Reinforcing nanocolloidal crystals by tuning interparticle bonding via atomic layer deposition

Zhang

Lee

et al. 2015

Acta Materialia

View full text Add to dashboard Cite

Section: Effect Of Ald Treatment On the Interparticle Bonding Strengthmentioning

confidence: 89%

Section: Granular Behavior (Regimes I and Ii)mentioning

confidence: 92%

Reinforcing nanocolloidal crystals by tuning interparticle bonding via atomic layer deposition

Zhang

Lee

et al. 2015

Acta Materialia

View full text Add to dashboard Cite

“…3a. Consequently, a long-range adhesion force is created because of van der Waals interactions of both surfaces ± the so-called ªjump inº [70]. This adhesion force F H0 can be modeled as a single rough sphere-sphere contact [56], additionally, with a characteristic spherical micro roughness height or radius h r < d instead of particle size d [71,72] …”

Section: Normal Force-displacement Functions Of Particle Contactmentioning

confidence: 99%

Product Design of Cohesive Powders – Mechanical Properties, Compression and Flow Behavior

Tomas¹

2004

Chem Eng & Technol

View full text Add to dashboard Cite

The fundamentals of cohesive powder consolidation and flow behavior are explained using a reasonable combination of particle and continuum mechanics. By the model ªstiff particles with soft contactsº, universal models are presented which include the elastic-plastic and viscoplastic particle contact behavior with adhesion, load-unload hysteresis and thus energy dissipation, a history-dependent and a nonlinear adhesion force function. With this as the physical basis, incipient powder consolidation, yield and cohesive steady-state flow, consolidation and compression functions, compression and preshear works are explained. As an example, the flow properties of an ultrafine limestone powder are shown. These constitutive models are used to evaluate shear cell test results for apparatus design to ensure reliable powder flow. Finally, conclusions are drawn concerning particle stressing, powder handling behavior and product quality assessment in processing industries.

show abstract

“…As with normal forces, friction can be measured in liquid [56,58,60], air/vapor [57,61,62], or vacuum [42]. In the case where a tip has been modified with a specific functionality, the so-called lateral force microscopy technique is often referred to as chemical force microscopy [52,63,64].…”

Section: Frictional Forcesmentioning

confidence: 99%

Atomic force microscopy and direct surface force measurements (IUPAC Technical Report)

Ralston

Larson

Rutland³

et al. 2005

Pure and Applied Chemistry

145

106

View full text Add to dashboard Cite

Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the need for formal IUPAC permission on condition that an acknowledgmentAbstract: The atomic force microscope (AFM) is designed to provide high-resolution (in the ideal case, atomic) topographical analysis, applicable to both conducting and nonconducting surfaces. The basic imaging principle is very simple: a sample attached to a piezoelectric positioner is rastered beneath a sharp tip attached to a sensitive cantilever spring. Undulations in the surface lead to deflection of the spring, which is monitored optically. Usually, a feedback loop is employed, which holds the spring deflection constant, and the corresponding movement of the piezoelectric positioner thus generates the image. From this it can be seen that the scanning AFM has all the attributes necessary for the determination of surface and adhesion forces; a sensitive spring to determine the force, a piezoelectric crystal to alter the separation of the tip and surface, which if sufficiently well-calibrated also allows the relative separation of the tip and surface to be calculated. One can routinely quantify both the net surface force (and its separation dependence) as the probe approaches the sample, and any adhesion (pulloff) force on retraction. Interactions in relevant or practical systems may be studied, and, in such cases, a distinct advantage of the AFM technique is that a particle of interest can be attached to the end of the cantilever and the interaction with a sample of choice can be studied, a method often referred to as colloid probe microscopy. The AFM, or, more correctly, the scanning probe microscope, can thus be used to measure surface and frictional forces, the two foci of this article. There have been a wealth of force and friction measurements performed between an AFM tip and a surface, and many of the calibration and analysis issues are identical to those necessary for colloid probe work. We emphasize that this article confines itself primarily to elements of colloid probe measurement using the AFM.

show abstract

Friction between Individual Microcontacts

Cited by 40 publications

References 40 publications

Reinforcing nanocolloidal crystals by tuning interparticle bonding via atomic layer deposition

Reinforcing nanocolloidal crystals by tuning interparticle bonding via atomic layer deposition

Product Design of Cohesive Powders – Mechanical Properties, Compression and Flow Behavior

Atomic force microscopy and direct surface force measurements (IUPAC Technical Report)

Contact Info

Product

Resources

About