Visible light pH change for activating polymers and other pH dependent reactants
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United States of America Patent
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Nov 7, 2000
Grant Date -
N/A
app pub date -
Aug 20, 1998
filing date -
Aug 20, 1998
priority date (Note) -
Expired
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Abstract
A method and apparatus for initiating a rapid and long-lasting pH change to a pH dependent polymer or other pH driven reactant is provided by a pH jump molecule in solution. Visible light is used to excite the pH jump molecule. The attendant pH change occurs rapidly (in nanoseconds) and can be maintained by continuous wave light or by an appropriately pulsed light. Heat resulting from the light activation is efficiently discharged by radiative decay through room temperature phosphorescence lifetimes existing on the order of milliseconds.
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