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- Siddhesh Dalvi
- Department of Polymer Science, The University of Akron, Akron, OH 44325;
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- Abhijeet Gujrati
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261;
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- Subarna R. Khanal
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261;
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- Lars Pastewka
- Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
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- Ali Dhinojwala
- Department of Polymer Science, The University of Akron, Akron, OH 44325;
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- Tevis D. B. Jacobs
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261;
書誌事項
- 公開日
- 2019-11-26
- 権利情報
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- https://www.pnas.org/site/aboutpnas/licenses.xhtml
- DOI
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- 10.1073/pnas.1913126116
- 公開者
- Proceedings of the National Academy of Sciences
この論文をさがす
説明
<jats:p>A mechanistic understanding of adhesion in soft materials is critical in the fields of transportation (tires, gaskets, and seals), biomaterials, microcontact printing, and soft robotics. Measurements have long demonstrated that the apparent work of adhesion coming into contact is consistently lower than the intrinsic work of adhesion for the materials, and that there is adhesion hysteresis during separation, commonly explained by viscoelastic dissipation. Still lacking is a quantitative experimentally validated link between adhesion and measured topography. Here, we used in situ measurements of contact size to investigate the adhesion behavior of soft elastic polydimethylsiloxane hemispheres (modulus ranging from 0.7 to 10 MPa) on 4 different polycrystalline diamond substrates with topography characterized across 8 orders of magnitude, including down to the angstrom scale. The results show that the reduction in apparent work of adhesion is equal to the energy required to achieve conformal contact. Further, the energy loss during contact and removal is equal to the product of the intrinsic work of adhesion and the true contact area. These findings provide a simple mechanism to quantitatively link the widely observed adhesion hysteresis to roughness rather than viscoelastic dissipation.</jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 116 (51), 25484-25490, 2019-11-26
Proceedings of the National Academy of Sciences