In situ Measurement of the Adhesion Strength and Effective Elastic Stiffness of Single Soft Micropillar |
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| Authors: | Ji Yeong Lee Won Kyung Seong In-Suk Choi Ranajay Ghosh Ashkan Vaziri Cheol-Woong Yang |
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| Affiliation: | 1. Institute for Multi-disciplinary Convergence of Matter, Korea Institute of Science and Technology , Seoul , Republic of Korea;2. Advanced Analysis Center, Korea Institute of Science and Technology , Seoul , Republic of Korea;3. Institute for Multi-disciplinary Convergence of Matter, Korea Institute of Science and Technology , Seoul , Republic of Korea;4. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology , Seoul , Republic of Korea;5. Department of Mechanical and Industrial Engineering , Northeastern University , Boston , Massachusetts , USA;6. School of Advanced Materials Science and Engineering, Sungkyunkwan University , Suwon , Republic of Korea |
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| Abstract: | We report the deformation behavior and mechanical properties of a polymeric micropillar, which measures approximately 10 μm by 30 μm in size by measuring the loading/unloading response using an in situ force measurement system. When the single poly(dimethylsiloxane) (PDMS) micropillar was subjected to compression, we observed a periodic wrinkle and global (Euler) buckling at the sidewall. During unloading, we found the pull-off force (adhesion force) to increase for higher values of preloading and also for lower loading/unloading rates. From the slope of the load–displacement curves measured in situ, we calculated the effective elastic stiffness of the PDMS micropillar to be about 2.03 MPa. In addition to the current work, we report that this method can be used more broadly for in situ measurement of the intrinsic mechanical and adhesion properties of polymers and other relatively soft materials. |
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| Keywords: | Dry adhesion Dynamic mechanical analysis Mechanical properties of adhesives Microscopy Polymers |
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