Viscoelastic characterization and modeling of polymer transducers for biological applications

I. Kuan Lin, Kuang Shun Ou, Yen Ming Liao, Yan Liu, Kuo Shen Chen, Xin Zhang

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

Polydimethylsiloxane (PDMS) is an important polymeric material widely used in bio-MEMS devices such as micropillar arrays for cellular mechanical force measurements. The accuracy of such a measurement relies on choosing an appropriate material constitutive model for converting the measured structural deformations into corresponding reaction forces. However, although PDMS is a well-known viscoelastic material, many researchers in the past have treated it as a linear elastic material, which could result in errors of cellular traction force interpretation. In this paper, the mechanical properties of PDMS were characterized by using uniaxial compression, dynamic mechanical analysis, and nanoindentation tests, as well as finite element analysis (FEA). A generalized Maxwell model with the use of two exponential terms was used to emulate the mechanical behavior of PDMS at room temperature. After we found the viscoelastic constitutive law of PDMS, we used it to develop a more accurate model for converting deflection data to cellular traction forces. Moreover, in situ cellular traction force evolutions of cardiac myocytes were demonstrated by using this new conversion model. The results presented by this paper are believed to be useful for biologists who are interpreting similar physiological processes.

Original languageEnglish
Pages (from-to)1087-1099
Number of pages13
JournalJournal of Microelectromechanical Systems
Volume18
Issue number5
DOIs
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Electrical and Electronic Engineering

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