Surface roughness and its influence on particle adhesion using atomic force techniques

Schaefer, David; Carpenter, Madeline H.; Gady, B.; Reifenberger, R.; Demejo, L. P.; Rimai, D. S.

doi:10.1163/156856195x00897

Cited by 134 publications

(97 citation statements)

References 22 publications

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“…Evaluation of Eqn 7 with surface energies in this range, predicts a pulloff force of a few micro-Newtons for a 10 m diameter particle. AFM measurements on 8 m diameter spherical particles (of glass, polystyrene, and tin) contacting atomically flat surfaces, however, resulted in lift-off forces which were typically a factor of 50 less than predicted values [Schaefer et al, 1995]. A detailed AFM mapping of the surface asperities and reinterpretation of the contacts as occurring between multiple asperities and the flat substrate, brought the theory and experiments to within a factor of 3 of each other (with the predicted pull-off force still greater than the measured values, but close enough that possible surface contamination could explain most remaining differences).…”

Section: Plastic Deformationmentioning

confidence: 76%

“…Surface roughness (e.g. detailed surface morphology) has been identified as one major contributor to the discrepancy between measured pull off forces for real par ticles and theoretical predictions for smooth surfaces [Rabinovich, et al, 2000 andRimai & Quesnel, 2001;Mizes, 1994;Schaefer et al, 1995]. Likewise as the particle size (or the radius of curvature in the contact region) decreases, it is possible for plastic deformations to occur at the contact, even with no external loads; however, plastic deformation are usually expected to cause less than a factor of two increase in effective adhesion forces (unless external loads are also applied to the contacting bodies).…”

Section: Discussionmentioning

confidence: 99%

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Review of Adhesion Fundamentals for Micron-Scale Particles

Walton

2008

KONA

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the thickness of a layer of adsorbed water is great enough for the liquid water to bridge the gap between the near surfaces (over a height comparable to the surface roughness). A number of AFM studies of the effect of humidity on adhesive forces have been AbstractThe effects of various fundamental forces on the adhesion of fine dust particles are reviewed. The particle-size and distance variation of surface-energy related (e.g., van der Waals)

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Section: Plastic Deformationmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Review of Adhesion Fundamentals for Micron-Scale Particles

Walton

2008

KONA

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“…Already some of the early measurements of surface/particle adhesion with the colloid probe technique showed much lower values of adhesion than expected for a simple sphere/plate geometry and this was attributed mainly to the roughness of the contacting surfaces [553,554].…”

Section: Influence Of Roughness On Adhesionmentioning

confidence: 98%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,198

2,949

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“…Most common types of glue are epoxy resins like Epicote 1004 or Epon R 1004F resin (Shell) (Ducker 1992), UV-curable glues like Norland Optical Cement No. 68 (Schaefer 1995) or Loctite glass bond (Bowen 2000). For some materials, e.g., polystyrene (Schaefer 1994), or borosilicate glass (Bonaccurso 2005), sintering of the particles to the cantilever is feasible, avoiding possible surface contamination by the glue.…”

Section: Sample Preparation -Attachment Of Particlesmentioning

confidence: 99%

Ultrafine cohesive powders: From interparticle contacts to continuum behaviour

Tykhoniuk

Tomas

Luding

et al. 2007

Chemical Engineering Science

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Continuum mechanical models and appropriate measuring methods to determine the materials parameters are available to describe the flow behaviour of cohesive powders. These methods are successfully applied to design process equipment as silos. In addition, "microscopic" studies on the particle mechanics can give a better physical understanding of essential "macroscopic" constitutive functions describing a powder "continuum". At present, by means of the discrete element method (DEM), a tool is available that allows one to consider repulsive and frictional as well as attractive adhesion forces in detail. Within the framework of Newton's equations of motion, each particle in the system is tracked, and reacts to the forces acting. The knowledge of the interaction forces between particles is thus a prerequisite for understanding (via DEM) the stability and flow of particulate systems and other phenomena. In this study, macroscopic cohesion and friction are related to their microscopic counterparts, adhesion and contact-friction. The macroscopic cohesion is found to be proportional to the maximal microscopic adhesion force, and the macroscopic friction coefficient is a non-linear function of the contact friction, dependent (or independent) on the preparation procedure for yielding (or steady-state flow). One of the few methods available for the direct measurement of surface-and contact-forces is the atomic force microscope (AFM) and, related to it, the so-called particle interaction apparatus (PIA). A contact model for ultrafine cohesive particles (average radius d 50 ≈ 1 µm) is introduced, based on such experiments. Plugged into DEM, consolidation, incipient yielding, and steady-state flow of the model powders are studied. Also the dynamic formation of the shear zone is examined and compared with experimental observations. Eventually, the shear experiments with volumetric strain measurements in a translational shear cell are used for validation.

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Surface roughness and its influence on particle adhesion using atomic force techniques

Cited by 134 publications

References 22 publications

Review of Adhesion Fundamentals for Micron-Scale Particles

Review of Adhesion Fundamentals for Micron-Scale Particles

Force measurements with the atomic force microscope: Technique, interpretation and applications

Ultrafine cohesive powders: From interparticle contacts to continuum behaviour

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