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Static Deflection Measurements of Cantilever Arrays Reveal Polymer Film Expansion and Contraction

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

J Colloid Interface Sci. 2007 Dec 15;316(2):687-93.

PMID: 17904571

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).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP25086480	Poly(vinyl chloride-co-vinyl acetate-co-vinyl alcohol)		25086-48-0	Price
AP27360072	Poly(vinyl butyral-co-vinyl alcohol-co-vinyl acetate)		27360-07-2	Price

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