The adhesion and surface energy of elastic solids

Kendall, K.

doi:10.1088/0022-3727/4/8/320

Cited by 649 publications

(422 citation statements)

References 2 publications

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“…Experimentally, we employ a peel test, 18 in which we record the force required to peel a strip of plaque from a glass slide at fixed pull angle and speed. To carry out a peel test on a plaque adhered to glass, it would be ideal if the geometry consisted of a strip of plaque of uniform width, with an initiated crack, that is being peeled from the glass surface.…”

Section: Fracture Energymentioning

confidence: 99%

Dynamics of mussel plaque detachment

et al. 2015

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Mussels are well known for their ability to generate and maintain strong, long-lasting adhesive bonds under hostile conditions. Many prior studies attribute their adhesive strength to the strong chemical interactions between the holdfast and substrate. While chemical interactions are certainly important, adhesive performance is also determined by contact geometry, and understanding the coupling between chemical interactions and the plaque shape and mechanical properties is essential in deploying bioinspired strategies when engineering improved adhesives. To investigate how the shape and mechanical properties of the mussel's plaque contribute to its adhesive performance, we use a custom built load frame capable of fully characterizing the dynamics of the detachment. With this, we can pull on samples along any orientation, while at the same time measuring the resulting force and imaging the bulk deformations of the plaque as well as the holdfast-substrate interface where debonding occurs. We find that the force-induced yielding of the mussel plaque improves the bond strength by two orders of magnitude and that the holdfast shape improves bond strength by an additional order of magnitude as compared to other simple geometries. These results demonstrate that optimizing the contact geometry can play as important a role on adhesive performance as optimizing the chemical interactions as observed in other organisms and model systems.

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Section: Fracture Energymentioning

confidence: 99%

Dynamics of mussel plaque detachment

et al. 2015

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“…By considering the contact of elastic bodies, it was evident that three parameters generally enter the equation for adhesive force F, as indicated in the equation [10] …”

Section: Introductionmentioning

confidence: 99%

van der Waals forces influencing adhesion of cells

Kendall

Roberts

2015

Phil. Trans. R. Soc. B

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Adhesion molecules, often thought to be acting by a 'lock and key' mechanism, have been thought to control the adhesion of cells. While there is no doubt that a coating of adhesion molecules such as fibronectin on a surface affects cell adhesion, this paper aims to show that such surface contamination is only one factor in the equation. Starting from the baseline idea that van der Waals force is a ubiquitous attraction between all molecules, and thereby must contribute to cell adhesion, it is clear that effects from geometry, elasticity and surface molecules must all add on to the basic cell attractive force. These effects of geometry, elasticity and surface molecules are analysed. The adhesion force measured between macroscopic polymer spheres was found to be strongest when the surfaces were absolutely smooth and clean, with no projecting protruberances. Values of the measured surface energy were then about 35 mJ m 22 , as expected for van der Waals attractions between the non-polar molecules. Surface projections such as abrasion roughness or dust reduced the molecular adhesion substantially. Water cut the measured surface energy to 3.4 mJ m 22 . Surface active molecules lowered the adhesion still further to less than 0.3 mJ m 22 . These observations do not support the lock and key concept.

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“…Weak adhesion between the metal electrodes and the donor substrate facilitates a clean peel-off process (27,28), so we choose metals such as Au and Pd, which adhere poorly to Si, as the bottom layer of the metal contact. Correspondingly, a strong adhesion between the metal electrodes and the receiver substrate is essential for reliable transfer and the robustness of the final devices.…”

mentioning

confidence: 99%

Fabricating nanowire devices on diverse substrates by simple transfer-printing methods

Lee

Kim

Zheng

2010

Proc. Natl. Acad. Sci. U.S.A.

129

105

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The fabrication of nanowire (NW) devices on diverse substrates is necessary for applications such as flexible electronics, conformable sensors, and transparent solar cells. Although NWs have been fabricated on plastic and glass by lithographic methods, the choice of device substrates is severely limited by the lithographic process temperature and substrate properties. Here we report three new transfer-printing methods for fabricating NW devices on diverse substrates including polydimethylsiloxane, Petri dishes, Kapton tapes, thermal release tapes, and many types of adhesive tapes. These transfer-printing methods rely on the differences in adhesion to transfer NWs, metal films, and devices from weakly adhesive donor substrates to more strongly adhesive receiver substrates. Electrical characterization of fabricated NW devices shows that reliable ohmic contacts are formed between NWs and electrodes. Moreover, we demonstrated that Si NW devices fabricated by the transfer-printing methods are robust piezoresistive stress sensors and temperature sensors with reliable performance.S emiconductor nanowires (NWs), because of their unique physical and chemical properties, have great potential for applications in the areas of electronics (1-3), photonics (4-7), and bio/chemical sensors (8-13), and the current state of the art of NW devices has been reviewed in refs. 14 and 15. In particular, when semiconductor NW devices are fabricated on flexible substrates, they function as versatile building blocks for high performance flexible and/or transparent electronics (16, 17) with possible extension to flexible displays, touch screens, flexible solar cells, and conformable sensors (8,16,17). To realize these NWbased applications, great efforts have been devoted to the fabrication of NW devices on flexible/transparent substrates with methods including conventional photo-and electron beam lithography (6)(7)(8)17). Although NW devices have been successfully fabricated on plastics, glass, and 17,18), the choice of device substrates is generally restricted because many useful flexible/transparent substrates, such as polydimethylsiloxane (PDMS) and tapes, suffer from problems such as shrinkage or degradation at the processing temperature, poor adhesion to NWs and metal electrodes, incompatibility with solvents and acids, and being too flexible to be handled for the lithography step.Here we report three simple transfer-printing methods to fabricate NW devices on diverse substrates including PDMS, Petri dishes, Kapton tapes, thermal release tapes, and many types of adhesive tapes. The three transfer-printing methods basically rely on the differences in adhesion to transfer NWs, metal films, and even entire NW devices from weakly adhesive donor substrates to more strongly adhesive receiver substrates when these two substrates are brought into close physical contact. Previously reported transfer-printing methods, such as microcontact printing, nanoscale-transfer printing, and metal transfer printing (16,(19)(20)(21)(22)(23), have been used...

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The adhesion and surface energy of elastic solids

Cited by 649 publications

References 2 publications

Dynamics of mussel plaque detachment

Dynamics of mussel plaque detachment

van der Waals forces influencing adhesion of cells

Fabricating nanowire devices on diverse substrates by simple transfer-printing methods

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