Indian Institute of Technology Madras
Question
Asked 4th Oct, 2020
Why I couldn't obtain a gel from APTES? Does the Amine group affect the gelation process?
I am trying to make a gel from APTES as a precursor using the sol-gel reaction. I tried different solvents (ethanol, acetone, DMF) and different catalysts (basic and acidic) with different concentrations. However, I couldn't obtain a gel.
Do you have any explanations of why the gel is not formed?
Does the Amine group affect the gelation process?
Thank you for your help.
Most recent answer
Zeineb Ben Rejeb Yes, it may need several days.
Popular answers (1)
SOUGUEUR Division - Chemistry (POLYMERS), Université Ibn Khaldoun Tiaret
Dear Zeineb Ben Rejeb, which amine you mean, is is the one of APTES? If so, the answer is no except its influence on the pH. In the following RG links mainly the first one, a detailled procedure is presented. Important to control the pH and ethanol/water ratio. My Regards
5 Recommendations
All Answers (6)
SOUGUEUR Division - Chemistry (POLYMERS), Université Ibn Khaldoun Tiaret
Dear Zeineb Ben Rejeb, which amine you mean, is is the one of APTES? If so, the answer is no except its influence on the pH. In the following RG links mainly the first one, a detailled procedure is presented. Important to control the pH and ethanol/water ratio. My Regards
5 Recommendations
Southwest State University (Russia)
Zeineb Ben Rejeb Below is an article that presents the gel synthesis you need. Follow this technique
3 Recommendations
Indian Institute of Technology Madras
Sometimes, it requires to wait for one or two days for the process to control. I guess in your case the pH is too acidic.
University of Toronto
Thank you for all your answers. I highly appreciate it.
Omkar Singh Kushwaha: What do you mean by waiting? Waiting under static or stiring conditions? Do you mean that the gelation may need several days to occur?
1 Recommendation
Indian Institute of Technology Madras
Zeineb Ben Rejeb Yes, it may need several days.
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