Anyone can suggest whether can I work at higher and lower pH with LUDOX HS/TM-40? I know that they are at pH 9.2 as a suspension but will they still be stable at pH 4 and pH 11?
Since the isoelectric point for Ludox is very low, the higher pH (11) should be fine (unless you add a lot of salt). The lower pH (4) might lead to aggregation.