Joined: 24 March 2009
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Topic: bases dissolving TEOS solgel coating Posted: 16 March 2010 at 3:32pm
Hi, I have been working on dip coating of acid catalyzed TEOS sols with an incorporated pH indicator dye (phenol red sodium salt) after dipcoating, I am drying at 125 degrees C for 1hr and have nice films that change color in acid or base solutions. However I seem to have a problem with basic solutions (sodium bicarbonate) at a pH of around 9 dissolving the coating from a glass microscope slide and other glass substrates. Any suggestions?
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