A viologen-based UV indicator and dosimeter

A. Mills, Michael McFarlane, Stefan Schneider

Research output: Contribution to journalArticle

Abstract

A UV indicator/dosimeter based on benzyl viologen (BV2+) encapsulated in polyvinyl alcohol (PVA) is described. Upon exposure to UV light, the BV2+/PVA film turns a striking purple colour due to the formation of the cation radical, BV center dot+. The usual oxygen sensitivity of BV center dot+ is significantly reduced due to the very low oxygen permeability of the encapsulating polymer, PVA. Exposure of a typical BV2+/PVA film, for a set amount of time, to UVB light with different UV indices produces different levels of BV center dot+, as measured by the absorbance of the film at 550 nm. A plot of the change in absorbance at this wavelength, Delta Abs(550), as a function of UV index, UVI, produces a linear calibration curve which allows the film to be used as a UVB indicator, and a similar procedure could be employed to allow it to be used as a solar UVI indicator. A typical BV2+/PVA film generates a significant, semi-permanent (stable for > 24 h) saturated purple colour (absorbance similar to 0.8-0.9) upon exposure to sunlight equivalent to a minimal erythemal dose associated with Caucasian skin, i.e. skin type II. The current drawbacks of the film and the possible future use of the BV2+/PVA film as a personal solar UV dosimeter for all skin types are briefly discussed.
LanguageEnglish
Pages299-305
Number of pages6
JournalAnalytical and Bioanalytical Chemistry
Volume386
Issue number2
DOIs
Publication statusPublished - Sep 2006

Fingerprint

Viologens
Polyvinyl Alcohol
Dosimeters
Skin
Benzyl Viologen
Color
Oxygen
Sunlight
Ultraviolet Rays
Calibration
Radiation Dosimeters
Cations
Permeability
Polymers
Ultraviolet radiation
Light
Wavelength

Keywords

  • UV dosimeter
  • UV indicator
  • methyl viologen
  • photoreduction

Cite this

Mills, A. ; McFarlane, Michael ; Schneider, Stefan. / A viologen-based UV indicator and dosimeter. In: Analytical and Bioanalytical Chemistry. 2006 ; Vol. 386, No. 2. pp. 299-305.
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abstract = "A UV indicator/dosimeter based on benzyl viologen (BV2+) encapsulated in polyvinyl alcohol (PVA) is described. Upon exposure to UV light, the BV2+/PVA film turns a striking purple colour due to the formation of the cation radical, BV center dot+. The usual oxygen sensitivity of BV center dot+ is significantly reduced due to the very low oxygen permeability of the encapsulating polymer, PVA. Exposure of a typical BV2+/PVA film, for a set amount of time, to UVB light with different UV indices produces different levels of BV center dot+, as measured by the absorbance of the film at 550 nm. A plot of the change in absorbance at this wavelength, Delta Abs(550), as a function of UV index, UVI, produces a linear calibration curve which allows the film to be used as a UVB indicator, and a similar procedure could be employed to allow it to be used as a solar UVI indicator. A typical BV2+/PVA film generates a significant, semi-permanent (stable for > 24 h) saturated purple colour (absorbance similar to 0.8-0.9) upon exposure to sunlight equivalent to a minimal erythemal dose associated with Caucasian skin, i.e. skin type II. The current drawbacks of the film and the possible future use of the BV2+/PVA film as a personal solar UV dosimeter for all skin types are briefly discussed.",
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A viologen-based UV indicator and dosimeter. / Mills, A.; McFarlane, Michael; Schneider, Stefan.

In: Analytical and Bioanalytical Chemistry, Vol. 386, No. 2, 09.2006, p. 299-305.

Research output: Contribution to journalArticle

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