Adhesion between Nanoscale Rough Surfaces

Rabinovich, Ya. I.; Adler, J.; Ata, Ali; Singh, Rajiv K.; Moudgil, Brij M.

doi:10.1006/jcis.2000.7167

Cited by 492 publications

(358 citation statements)

References 14 publications

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“…The effect of the asperity is to avoid a closer contact between particle and surface, thus reducing the adhesion force. Since surface roughness is usually not determined as a mean asperity radius but typically by a root mean square (rms) value, a more applicable formulation of the Rumpf model was suggested by Rabinovich et al [556]. They derived a relationship between rms roughness and r based on a surface model of close packed hemispherical peaks and valleys and obtained the modified equation (with rms being the rms value of the surface roughness):…”

Section: Influence Of Roughness On Adhesionmentioning

confidence: 99%

See 1 more Smart Citation

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

Butt

Cappella

Kappl

2005

Surface Science Reports

3,242

2,949

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Section: Influence Of Roughness On Adhesionmentioning

confidence: 99%

“…The same authors proposed a more sophisticated model that uses spherical caps instead of hemispheres [556] and can be expanded to take into account surface roughness of different length scales (Fig. 25, middle) [557].…”

Section: Influence Of Roughness On Adhesionmentioning

confidence: 99%

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

Butt

Cappella

Kappl

2005

Surface Science Reports

3,242

2,949

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“…It is well know from colloid science that van der Waals interactions strongly depend on the geometry of the particle and surface. [34,35]. Rabinovich models roughness as a distribution of closely packed hemispheres with equal radius (the asperity radius) r having their origin below the average surface, each protruding from this surface to a maximum peak height.…”

Section: Effect Of Surface Roughness On Adhesion Forcementioning

confidence: 99%

“…As a cause of this variation surface roughness and surface heterogeneity have been suggested [31][32][33][34][35][36][37]. The decrease of adhesion with surface roughness can influence particle adhesion.…”

Section: Introductionmentioning

confidence: 99%

On the Adhesion between Fine Particles and Nanocontacts: An Atomic Force Microscope Study

et al. 2006

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To optimize the handling of fine powders in industrial applications, understanding the interaction forces between single powder particles is fundamental. The forces between colloidal particles dominate the behavior of a great variety of materials, including paints, paper, soil, and many industrial processes. With the invention of the atomic force microscope (AFM), the direct measurement of the interaction between single micron-sized particles became possible. The adhesional contact between a particle and a substrate is a parameter for analyzing pull-off force data generated by AFM. The aim of this study was to understand surface interactions between fine particles. I measured the adhesion forces between AFM tips or particles attached to AFM cantilevers and different solid samples. Smooth and homogeneous surfaces such as silicon wafer, mica, or highly oriented pyrolytic graphite (HOPG), and more rough and heterogeneous surfaces such as iron particles or patterns of TiO 2 nanoparticles on silicon wafer were used. First, I addressed to the wellknown issue that AFM adhesion experiment results show wide distributions of adhesion forces rather than a single value. My experimental results show that variations in adhesion forces comprise fast (i.e., from one force curves to the next) random fluctuations and slower fluctuations, which occur over tens or hundreds of consecutive measurements. Slow fluctuations are not likely to be the result of variations in external factors such as lateral position, temperature, humidity, and so forth because those were kept constant. Even if two solid bodies are brought into contact under precisely the same conditions (same place, load, direction, etc.) the result of such a measurement will often not be the same as for the previous contact. The measurement itself will induce structural changes in the contact region which can change the value for the next adhesion force measurement.In the second part I studied the influence of humidity on the adhesion of nanocontacts. Humidity was adjusted relatively fast to minimize tip wear during one experiment. For hydrophobic surfaces, no signification change of adhesion force with humidity was observed. Adhesion force-versus-humidity curves recorded with hydrophilic surfaces either showed a maximum or continuously increased. I demonstrate that the results can be interpreted with simple continuum theory of the meniscus force. The meniscus force is calculated based on a model that includes surface roughness and takes into account different AFM tip (or particle) shapes by a two-sphere-model.Experimental and theoretical results show that the precise contact geometry has a critical influence on the humidity dependence of the adhesion force.Changes of tip geometry on the sub-10-nm length scale can completely change adhesion force-versus-humidity curves. Our model can also explain the differences between earlier AFM studies, where different dependencies of the adhesion force on humidity were observed.Keywords: Atomic force microscopy (AFM), cantile...

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“…Rabinovich et al [17,18] have proven that Van der Waals' forces depend on surface roughness. The Van der Waals' forces are generally inversely proportional to surface roughness.…”

Section: Theoretical Framework On the Dependence Of Van Der Waals' Fomentioning

confidence: 99%

Silver, Copper and Aluminium Coatings for Micro-Material Handling Operations

Matope

Rabinovich³

2013

sajie

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Micro-material handling has challenges accompanying it because of adhesive forces, which make the picking and placing of micro-parts difficult. The adhesive forces hinder the picking of a micro-part, and once picked, they pose even a greater challenge when attempts to release a micro-part are made. Van der Waals' forces are part of the adhesive forces and are always present between interacting surfaces in a micro-material handling operation. However, Van der Waals' forces can profitably be manipulated in a micromaterial handling operation. The paper reveals how the Van der Waals' forces can be advantageously used in micro-material handling operations involving silver, copper and aluminium coatings of rms surface roughness values ranging from 0.5 nm to 2.72 nm, which are produced by the electron beam evaporation (e-beam) method. These were found to exert Van der Waals' forces ranging from 17 nN to 314 nN, which can be used for reliable micro-material handling operations. OPSOMMINGDie hantering van materiaal op 'n mikroskaal het uitdagings wat daarmee gepaard gaan as gevolg van kleefkragte. Kleefkragte bemoeilik die optel van 'n mikro-onderdeel en, wanneer dit eers opgetel is, is daar selfs ŉ groter uitdaging wanneer die part geplaas en gelos moet word. Van der Waalskragte vorm deel van die kleefkragte en is altyd teenwoordig tussen opervlaktes wat met mekaar in aanraking kom wanneer mikro-materiale gehanteer word. Van der Waalskragte kan egter voordelig gemanipuleer word in 'n mikromateriaalhanteringsituasie. Hierdie artikel toon hoedat Van der Waalskragte voordelig gebruik kan word wanneer silwer-, koper-en aluminiumbedekkings met 'n wgk oppervlakgrofheid tussen 0.5 nm en 2.72nm, wat deur die elektronstraalverdamping (e-straal) metode geproduseer word, gehanteer moet word. Daar is gevind dat hierdie bedekkings Van der Waalskragte tussen 17nN en 314nN uitoefen. Die Van der Waalskragte kan gebruik word vir betroubare mikro-materiaalhantering.

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Adhesion between Nanoscale Rough Surfaces

Cited by 492 publications

References 14 publications

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

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

On the Adhesion between Fine Particles and Nanocontacts: An Atomic Force Microscope Study

Silver, Copper and Aluminium Coatings for Micro-Material Handling Operations

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