Viscoelastic mechanical behavior of soft microcantilever-based force sensors

I-Kuan Lin; Yen-Ming Liao; Yan Liu; Kuang-Shun Ou; Kuo-Shen Chen; Xin Zhang
December 2008
Applied Physics Letters;12/22/2008, Vol. 93 Issue 25, p251907
Academic Journal
Polydimethylsiloxane (PDMS) microcantilevers have been used as force sensors for studying cellular mechanics by converting their displacements to cellular mechanical forces. However, PDMS is an inherently viscoelastic material and its elastic modulus changes with loading rates and elapsed time. Therefore, the traditional approach to calculating cellular mechanical forces based on elastic mechanics can result in errors. This letter reports a more in-depth method for viscoelastic characterization, modeling, and analysis associated with the bending behavior of the PDMS microcantilevers. A viscoelastic force conversion model was developed and validated by proof-of-principle bending tests.


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