reducing the conductivity of silanol group

[frenchero]

Hi,

I am performiong electromosis into glass channels and I would like to reduce the silanol group conductivity. I am not an expert in surface treatment and I only know treatment with OTS but it makes the cannel become too hydrophobiac to use aquaeous solutions and that's hat I am using.
Any body has an idea?

Thank you.

[chemisttree]

Try heating the glass to condense the silanol groups by removing water.

-Si-OH + HO-Si- ---> Si-O-Si + H2O

[frenchero]

but would not heating cause extra damages to the glass before the silanol groups condense? I mean in this form glass is pretty stable and you will have to heat at high temperature won't you?

[frenchero]

another really important that I forgot to mention is that the silanol groups create a double layer in my system by exchanging protons so I need to keep protons which I do not if I condense silanol groups.

[chemisttree]

How much to heat and for how long appears to be a unique set of parameters for your problem. You will need to keep some but perhaps not all?

BTW treatment with OTS will remove the silanol groups as well... bye, bye double layer!