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bases dissolving TEOS solgel coating

Printed From: Sol-Gel Gateway
Category: Sol-Gel Forum
Forum Name: Chemistry
Forum Discription: General Discussion on Sol-Gel Chemistry, Precursors Reactivity, Chemical Reactions Paths (Hydrolysis, Polycondensation, Chemical Additives effects, etc)
URL: http://www.solgel.com/sgforum/forum_posts.asp?TID=1774
Printed Date: 26 June 2017 at 4:33pm


Topic: bases dissolving TEOS solgel coating
Posted By: jakeconner
Subject: bases dissolving TEOS solgel coating
Date 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?

-Jake



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