--- "Rashid, Mamun"  wrote:

> Hello ,
> You can prepare sol-gel by using ETOH, TEOS and
> water.
> Method
> Ratio of chemicals
>   ETOH : TEOS: water = 10 :5: 2
> Mix  ETOH , ETOS and water and keep them in the
> sonicator for 30 mins.
> Afterward add 2 drops of conc HCl( it will act as
> catalyst) and leave
> for further 30 mins. Sol gel will be prepared.


Hello Mamun;

Concerning HCl, did you mean 2 drops exactly? If there
will be excess of HCl, will that change the properties
of Sol-Gel?
Do you some electrical and/or physical properties of
Sol-Gel prepared by your technique?

Thanks alot for your helpful reply.

Dr. Hicham - El-Din Mahfoz KOTB
Physics department - Faculty of Science - Assiut University
Assiut 71516 - Assiut - Egypt.