In situ Measurement of the Adhesion Strength and Effective Elastic Stiffness of Single Soft Micropillar

Title
In situ Measurement of the Adhesion Strength and Effective Elastic Stiffness of Single Soft Micropillar
Authors
이지영성원경최인석Ranajay GhoshAshkan Vaziri양철웅이광렬문명운
Keywords
Adhesion; single pillar; in situ measurement; bio-inspired
Issue Date
2015-05
Publisher
The Journal of adhesion
Citation
VOL 91, NO 5, 369-380
Abstract
We report the deformation behavior and mechanical properties of a polymeric micropillar, which measures approximately 10 lm by 30 lm 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.
URI
http://pubs.kist.re.kr/handle/201004/49382
ISSN
00218464
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KIST Publication > Article
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