Method of making a composite membrane
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United States of America Patent
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Sep 15, 2009
Grant Date -
Sep 14, 2006
app pub date -
Mar 11, 2005
filing date -
Mar 11, 2005
priority date (Note) -
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Abstract
A method of making a composite membrane with ion exchange properties includes, in an exemplary embodiment, forming a porous membrane from a first material, dissolving a coating material in a fluid at supercritical conditions, and exposing the porous membrane to the coating material dissolved in the supercritical fluid. The method also includes precipitating a uniform coating of the coating material onto an exterior surface of the porous membrane by changing the supercritical conditions of the fluid to a non-supercritical condition, and applying an ion exchange material to the coated porous membrane so that the ion exchange material is in intimate contact with substantially all of the coated surfaces of the porous membrane.
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