Static deflection measurements of cantilever arrays reveal polymer film expansion and contraction

David Snow, Brandon L. Weeks, Dae Jung Kim, Albert Loui, Bradley R. Hart, Louisa J. Hope-Weeks

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

An optical static method of detection is used to interpret surface stress induced bending related to cantilevers coated on one side with poly(vinyl alcohol), poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate), and poly(vinyl chloride-co-vinyl acetate-co-2-hydroxypropyl acrylate), or respectively, PVA, PVB, and PVC, and exposed to various solvent vapors. Results indicate that the adsorption and surface interactions of the different solvent vapors that cause polymer swelling and shrinking lead to rearrangements, which have been shown to change the elastic properties of the polymer film, and subsequently, the spring constant of the polymer coated cantilever. Static deflection measurements allow the direction of cantilever bending to be determined, which adds a new dimension of usefulness for surface functionalized cantilevers as transducers in the development of novel microelectromechanical systems (MEMS).

Original languageEnglish
Pages (from-to)687-693
Number of pages7
JournalJournal of Colloid And Interface Science
Volume316
Issue number2
DOIs
StatePublished - Dec 15 2007

Keywords

  • Cantilever
  • Frenkel-Flory-Rehner
  • MEMS
  • Polymer elasticity
  • Spring constant
  • Surface stress

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