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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 47, Iss. 10 — Oct. 1, 1993
  • pp: 1609–1611

Rapid Assay for Polystyrene Surface Oxidation

M. Bryhan, E. C. Onyiriuka, L. S. Hersh, and W. Hertl

Applied Spectroscopy, Vol. 47, Issue 10, pp. 1609-1611 (1993)


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Abstract

Polystyrene surfaces are often corona-discharge or plasma treated to oxidize the surface, which enhances the wettability. X-ray photoelectron spectroscopy (XPS), which requires time and an ultra-high vacuum, is generally used to measure this surface oxidation. A rapid, simple method for measuring polystyrene surface oxidation is described. The surface is soaked in a solution of Azure A dye, which adsorbs only to oxidized sites on the polystyrene. The excess dye is flushed away and the bound dye is desorbed with a detergent; an absorbance measurement at 635 nm is used to determine the quantity of desorbed dye. This value correlates with the polystyrene surface oxygen concentration and gives r2 = 0.93.

Citation
M. Bryhan, E. C. Onyiriuka, L. S. Hersh, and W. Hertl, "Rapid Assay for Polystyrene Surface Oxidation," Appl. Spectrosc. 47, 1609-1611 (1993)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-47-10-1609

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