A novel model for the effect of geometric properties of micro/nanoscale asperities on surface adhesion

Kolahdoozan, Mojtaba; Nikkhah‐Bahrami, Mansour

doi:10.1016/j.ijadhadh.2013.09.035

Cited by 13 publications

(12 citation statements)

References 35 publications

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“…Deposition of layer was carried out in two methods. Single‐layer coatings were the first method, which their effect on reduction of surface adhesion force has been proven in this paper and previous researches . The second method is a double‐layer deposition that is a new method to reduce the surface adhesion force, and the purpose of this method is to change the surface roughness and decrease of adhesion force; this is effective on increasing the efficiency of microassemblies and other equipments of MEMS.…”

Section: Discussionmentioning

confidence: 69%

“…As a result, the actual contact and the adhesion force between the two surfaces reduce. There are many studies on reducing adhesion force by an increase in surface roughness parameters …”

Section: Resultsmentioning

confidence: 99%

“…The materials investigated in this work were thin solid films of gold, silver, and titanium dioxide with the thickness of 150 and 100 nm. This thickness of coating usually was used in MEMS especially in microassemblies and the process of making microgrippers …”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…Therefore, coating materials should have high conductivity and low surface adhesion. Accordingly, many studies have addressed coatings of gold and silver on the silicon substrate …”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of the adhesion force of single and double‐layer coatings on MEMS surfaces

Joulaei

Kolahdoozan

Salehi

et al. 2018

Surface & Interface Analysis

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Adhesion force is one of the most important factors in microelectromechanical systems (MEMS), especially for microassembly. It depends on operating conditions and is affected by the contact area. In this study, the adhesion force between MEMS materials and AFM tips was analysed using AFM's point-mode spectroscopy. The aim was to study the effectiveness of various coatings in MEMS adhesion surfaces.For this purpose, five silicon surfaces were used, four of which were coated, and one was noncoated. Two of them were deposited by single-layer coating (Au and Ag). The other two were deposited by double-layer coating (TiO 2 /Au, TiO 2 /Ag) on a Si (1 0 0) substrate. The depositing was accomplished by the thermal evaporation method. Composite materials and analysis were reviewed by observing the SEM image. The experimental results showed that the method of deposition helped to decrease the adhesion force between the probe tip and the surface of the specimens, and double-layer coating had stronger effect on decreasing the adhesion force than the single-layer coating.

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Section: Discussionmentioning

confidence: 69%

“…As a result, the actual contact and the adhesion force between the two surfaces reduce. There are many studies on reducing adhesion force by an increase in surface roughness parameters …”

Section: Resultsmentioning

confidence: 99%

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…Therefore, coating materials should have high conductivity and low surface adhesion. Accordingly, many studies have addressed coatings of gold and silver on the silicon substrate …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental investigation of the adhesion force of single and double‐layer coatings on MEMS surfaces

Joulaei

Kolahdoozan

Salehi

et al. 2018

Surface & Interface Analysis

Self Cite

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“…Kolahdoozan et al [9] studied the effects of the geometrical properties of deposited samples on the adhesion of the surface of contact between a sample and an AFM probe tip. They showed that the deposition method, and the type and thickness of the coated film and surface roughness help increase the repulsion at the region of contact between probe tip and sample surface.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of surface roughness on the critical sliding and rolling forces of cylindrical nanoparticles based on the multi-asperity contact models

2015

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This paper has investigated the dynamic behavior of a cylindrically shaped DNA nanoparticle during its displacement on a rough substrate by an atomic force microscope. Due to the cylindrical geometry of the DNA nanoparticle, two multi-asperity models have been considered for the adhesion between nanoparticle and rough substrate. The two selected models for the contact between smooth and rough surfaces have been further developed for cylindrical geometries. One of these models is analytical and based on uniform asperities and the other one is based on random asperities. Also, in each of these models, the real area of contact between particle and rough substrate has been calculated based on the number of asperities in contact. Then, a 3D dynamic model for the manipulation of cylindrical nanoparticle on rough substrate has been developed and simulated. The maximum difference between the results obtained from the two multiasperity models is \5 %, indicating a good agreement between the two models. The comparison of critical forces indicates that the critical force necessary for moving a particle is smaller for rough substrates than for smooth substrates and larger compared to the critical force obtained from the Rabinovich model, which is singleasperity model. Finally, the surface roughness parameters were estimated from the topographic images, and the manipulation process was simulated for these substrates by developing the relevant equations. The obtained results indicated that the critical force for a substrate with a higher root-mean-square roughness is smaller and particles can be moved easier on such a substrate.

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Comparison of the adhesion forces in single and double‐layer coatings on the MEMS surfaces by JKR and DMT models

Joulaei

Kolahdoozan

Salehi

et al. 2019

Surface & Interface Analysis

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In many medical and industrial applications, some strategies are needed to control the adhesion forces between the materials, because surface forces can activate or hinder the function of the device. All actual surfaces present some levels of roughness and the contact between two surfaces is transferred by the asperities on the surfaces.The force of the adhesion, which depends on the operating situations, can be influenced by the contact region. The aim of the present study is to predict the adhesion force in MEMS surfaces using the JKR and DMT models. The surfaces of the coating material in this research consisted of the single-layer coating of Gold and Silver, and the double-layer coating of TiO 2 /Gold and TiO 2 /Silver on the silicon (100) substrates.The depositing was done by the thermal evaporation method. The results showed that the double-layer coating developed by the new deposition method helped the reduction of the adhesion forces between the probe tip and the specimen surface.The predicted adhesion forces between the probe and the specimens with DMT and JKR models were compared with the experimental results. For all specimens, the simulated data by applying the JKR theory were in a good agreement with the adhesion force experimental values.

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A novel model for the effect of geometric properties of micro/nanoscale asperities on surface adhesion

Cited by 13 publications

References 35 publications

Experimental investigation of the adhesion force of single and double‐layer coatings on MEMS surfaces

Experimental investigation of the adhesion force of single and double‐layer coatings on MEMS surfaces

Investigating the effect of surface roughness on the critical sliding and rolling forces of cylindrical nanoparticles based on the multi-asperity contact models

Comparison of the adhesion forces in single and double‐layer coatings on the MEMS surfaces by JKR and DMT models

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