Experimental and Theoretical Analysis of a Dynamic JKR Contact

Charrault, Eric; Gauthier, Christian; Marie, P.; Schirrer, R.

doi:10.1021/la803434b

Cited by 23 publications

(27 citation statements)

References 24 publications

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“…The decreasing pull-off force ( f (r 1 , r 2 , z 0 ), equation (12)) obtained, after surface structuring against the plan surface (F vdw plan , equation (11)), can be evaluated from equation (7) or (8). In the follow, and with the observation done on the Figure 8, only the equation (7) modification are exposed:…”

Section: Discussionmentioning

confidence: 99%

“…The pull-off force is not well understood and must be studied further to enable the advent of reliable micromanipulation techniques. Current methods to measure micro/nanoforces between surfaces are the Surface Force Apparatus (SFA), 7,8 the Atomic Force Microscope (AFM), [9][10][11] capacitive force sensors 12 or nanoindentation testers. 13,14 The modeling of pull-off force is mainly based on two different approaches based on the surface energies on the contact, [15][16][17][18] or on the integration of the van der Waals forces between objects [19][20][21][22] and on some hybrid approaches between both.…”

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confidence: 99%

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Adhesion Control for Micro- and Nanomanipulation

et al. 2011

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The adhesion between a micro/nano-object and a micro-gripper end-effector is an important problem in micromanipulation. Cancelling or reduction this force is a great challenge.This force is directly linked to the surface chemical structure of the object and the gripper. We propose to predict this force between a structuring surface and a micro-object with a multisphere van der Waals force model. The surface was structured by polystyrene latex particles (PS particles) with radii from 35 to 2000 nm. The model was compared with experimental pulloff force measurement performed by AFM with different natures of spheres materials glued on the tipless. A wide range of applications, in the field of telecommunications, bioengineering, and more generaly speaking MEMS can be envisaged for these substrates. † FEMTO-ST Institute ‡ IEMM ¶ EMPA

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Adhesion Control for Micro- and Nanomanipulation

et al. 2011

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“…The pull-off forces are not well understood and must be studied further to enable the advent of reliable micromanipulation techniques. Current methods to measure micro/nanoforces between surfaces are the Surface Force Apparatus (SFA), 7,8 the Atomic Force Microscope (AFM), [9][10][11] capacitive force sensors 12 or nanoindentation testers. 13,14 The modeling of pull-off force are mainly based on two different approaches based on the surface energies on the contact, [15][16][17][18] or on the integration of the van der Waals forces between objects [19][20][21] and on some hybrid approaches between both.…”

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confidence: 99%

Reducing the Adhesion between Surfaces Using Surface Structuring with PS Latex Particle

Dejeu

Bechelany

Philippe

et al. 2010

ACS Appl. Mater. Interfaces

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The adhesion between a micro-object and a microgripper end-effector is an important problem in micromanipulation. Canceling or reducing this force is a great challenge. This force is directly linked to the surface chemical structure of the object and the gripper. We propose to reduce the adhesion force by using a self-assembled monolayer structuring on one surface. The surface was structured by polystyrene latex particles (PS particles) with radii from 100 to 1500 nm. The adhesion force measurements obtained by AFM were compared to a multisphere van der Waals force model. The model suggests the existence of an optimal value of the sphere radius which minimizes the adhesion. In that case, the pull-off force is reduced to 20 nN by the PS particles layer with a radius of 45 nm. A wide range of applications in the field of telecommunications, bioengineering, and more generally speaking, MEMS can be envisaged for these substrates.

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“…On the one hand, JKR, DMT or Maugis models are usually used to compute pull-off forces (force needed to split two objects in contact). They are computed with global energy calculation and their efficiency is well established at macroscale [8] but they are not correlated with experimental microscale measurements. These models take into account the impact of the deformation on the pull-off force but they are restricted to sphere/plane contact and cannot be applied to more complex geometries (e.g., parallelepipedic objects) usually used in microhandling [9].…”

Section: The Lack Of Adhesion Model For Micromanipulationmentioning

confidence: 99%

A van der Waals Force-Based Adhesion Model for Micromanipulation

Alvo

Lambert

Gauthier

et al. 2010

Journal of Adhesion Science and Technology

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The robotic manipulation of microscopic objects is disturbed directly by the adhesion between the endeffector and the objects. In the microscale, no reliable model of adhesion is available and currently the behaviour of the micro-objects cannot be predicted before experiments. This paper proposes a new model of adhesion based on the analytical resolution of the coupling between the mechanical deformation of the micro-objects and van der Waals forces. In the nanoscale, the impact of the deformation can be neglected and the proposed model is thus similar to the classical expression for van der Waals forces. In the microscale, the deformation induces van der Waals forces to increase significantly and a new analytical expression is proposed. The limit of validity of this 'deformable van der Waals forces' is also discussed. This result can be used as an alternative to classical adhesion-deformation models in literature (Johnson-Kendall-Roberts (JKR) or Derjaguin-Muller-Toporov (DMT)), which have been validated at the macroscale but are not sufficient to describ the interaction forces in the microscale (typically from 100 nm to 500 µm).

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Experimental and Theoretical Analysis of a Dynamic JKR Contact

Cited by 23 publications

References 24 publications

Adhesion Control for Micro- and Nanomanipulation

Adhesion Control for Micro- and Nanomanipulation

Reducing the Adhesion between Surfaces Using Surface Structuring with PS Latex Particle

A van der Waals Force-Based Adhesion Model for Micromanipulation

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