Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-24476
Trinh, T T; Jansen, A P J; van Santen, R A; VandeVondele, J; Meijer, E J (2009). Effect of Counter Ions on the Silica Oligomerization Reaction. ChemPhysChem, 10(11):1775-1782.
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The silicate oligomerization reaction is key to sol-gel chemistry and zeolite synthesis. Numerous experimental and theoretical studies have addressed the physical chemistry of silicate oligomers in the prenucleation stage of siliceous zeolite formation. Here we report a study of a silica condensation reaction in aqueous solution in the presence of counter ions (Li+ and NH4+). Ab-initio molecular dynamics simulations have been used to construct reaction energy diagrams including transition state free energies. Contact with Li+ as well as NH4+ increases the activat ion energies of the dimerization step compared to the situation in the absence of counterions. The presence of NH4+ has no effect on consecutive oligomerization steps. Hence NH4+ will increase the relative formation rate of larger oligomers.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Department of Chemistry|
|Dewey Decimal Classification:||540 Chemistry|
|Date:||9 June 2009|
|Deposited On:||16 Dec 2009 14:14|
|Last Modified:||05 Jun 2014 13:50|
|Additional Information:||Free access at DOI|
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