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Visual hydrogen detector with variable reversibilityMethods, processes and compositions are provided for a visual or chemochromic hydrogen-detector with variable or tunable reversible color change. The working temperature range for the hydrogen detector is from minus 100.degree. C. to plus 500.degree. C. A hydrogen-sensitive pigment, including, but not limited to, oxides, hydroxides and polyoxo-compounds of tungsten, molybdenum, vanadium, chromium and combinations thereof, is combined with nano-sized metal activator particles and preferably, coated on a porous or woven substrate. In the presence of hydrogen, the composition rapidly changes its color from white or light-gray or light-tan to dark gray, navy-blue or black depending on the exposure time and hydrogen concentration in the medium. After hydrogen exposure ceases, the original color of the hydrogen-sensitive pigment is restored, and the visual hydrogen detector can be used repeatedly. By changing the composition of the hydrogen-sensitive pigment, the time required for its complete regeneration is varied from a few seconds to several days.
Document ID
20110015400
Acquisition Source
Glenn Research Center
Document Type
Other - Patent
Authors
Muradov, Nazim
Date Acquired
August 25, 2013
Publication Date
August 23, 2011
Subject Category
Chemistry And Materials (General)
Funding Number(s)
CONTRACT_GRANT: NAG3-2751.
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-Patent-8,003,055
Patent Application
US-Patent-Appl-SN-12/038,210
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