Reducing the conductivity of silanol group

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SUMMARY

This discussion focuses on methods to reduce the conductivity of silanol groups in glass channels during electromosis. The primary suggestion involves heating the glass to condense silanol groups, which can remove water and potentially alter the conductivity. However, concerns are raised about the stability of the glass at high temperatures and the impact on proton exchange, which is crucial for maintaining the double layer in the system. The treatment with octadecyltrichlorosilane (OTS) is noted to eliminate silanol groups, but this also removes the double layer, complicating the approach.

PREREQUISITES
  • Understanding of silanol group chemistry
  • Knowledge of glass surface treatment techniques
  • Familiarity with electromosis processes
  • Basic principles of proton exchange in aqueous solutions
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  • Research the effects of heating glass on silanol group condensation
  • Explore alternative surface treatments to OTS that maintain hydrophilicity
  • Investigate methods for measuring conductivity in silanol groups
  • Learn about the role of double layers in electrochemical systems
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Researchers and engineers working with glass channels in electrochemical applications, particularly those focused on surface treatments and conductivity management in aqueous environments.

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

-Si-OH + HO-Si- ---> Si-O-Si + H2O
 
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?
 
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.
 
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!
 

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