Method for measuring oxygen diffusion coefficients of polymer films by luminescence quenching

Analytical Chemistry
K A KneasB A DeGraff

Abstract

To ascertain the relationship between the physical properties of polymer supports and the observed response of luminescence-based oxygen sensors, a quenching-based method was developed to measure oxygen diffusion in polymers. The method offers advantages over existing quenching-based techniques since it allows a simple correction for films of high optical density, and the computations do not assume uniform oxygen concentration throughout the film. Diffusion coefficients (D) were measured for a series of sensors with [Ru(Ph2phen)3]Cl2 (Ph2phen = 4,7-diphenyl-1,10-phenanthroline) asthe luminophore and polystyrene, poly(trimethylsilylmethyl methacrylate), poly(butyl methacrylate), poly(trimethylsilylmethyl methacrylate-co-butyl methacrylate), or poly(trimethylsilylmethyl methacrylate-co-1H, 1H-heptafluorobutyl methacrylate) as the support. The solvent from which the films were cast was varied, and filler materials such as hydrophobic, amorphous silica or tributyl phosphate plasticizer were added. Results are interpreted by a domain model in which the local environment of the sensor, rather than the bulk properties of the polymer, is the most critical parameter in sensor design.

References

Dec 22, 1999·Analytical Chemistry·J N DemasP B Coleman

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Citations

Aug 6, 2010·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Sanchari ChowdhuryRajan Sen
Aug 7, 2008·The Review of Scientific Instruments·Fletcher KimuraMartin Gouterman
Jan 15, 2015·Biomicrofluidics·Miguel A AcostaMichael P Gamcsik
Nov 24, 2020·Physical Chemistry Chemical Physics : PCCP·Yu-Hsuan ChengPi-Tai Chou
Jan 7, 2010·Analytical Chemistry·Sarah J PayneJ N Demas
Mar 31, 2010·Chemistry of Materials : a Publication of the American Chemical Society·Yanqing TianDeirdre R Meldrum
Nov 22, 2005·Environmental Science & Technology·Wayne W LukensNorman M Edelstein
Sep 29, 2006·Colloids and Surfaces. B, Biointerfaces·Yuanfang Liu, Shaopeng Wang

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