Computational models for the determination of depth-dependent mechanical properties of skin with a soft, flexible measurement device

Jianghong Yuan, Canan Dagdeviren, Yan Shi, Yinji Ma, Xue Feng, John A. Rogers*, Yonggang Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations


Conformal modulus sensors (CMS) incorporate PZT nanoribbons as mechanical actuators and sensors to achieve reversible conformal contact with the human skin for non-invasive, in vivo measurements of skin modulus. An analytic model presented in this paper yields expressions that connect the sensor output voltage to the Young moduli of the epidermis and dermis, the thickness of the epidermis, as well as the material and geometrical parameters of the CMS device itself and its encapsulation layer. Results from the model agree well with in vitro experiments on bilayer structures of poly(dimethylsiloxane). These results provide a means to determine the skin moduli (epidermis and dermis) and the thickness of the epidermis from in vivo measurements of human skin.

Original languageEnglish (US)
Article number20160225
JournalProceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number2194
StatePublished - Oct 1 2016



  • Conformal modulus sensors
  • Electromechanical coupling
  • Epidermis and dermis
  • Skin moduli

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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