Title
New insights into the mesophase transformation of ethane-bridged PMOs by the influence of different counterions under basic conditions New insights into the mesophase transformation of ethane-bridged PMOs by the influence of different counterions under basic conditions
Author
Faculty/Department
Faculty of Sciences. Chemistry
Faculty of Sciences. Physics
Publication type
article
Publication
Subject
Chemistry
Source (journal)
RSC advances
Volume/pages
5(2015) :8 , p. 5553-5562
ISSN
2046-2069
ISI
000347304900010
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The counterions are of crucial importance in determining the mesostructure and morphology of ethanebridged PMO materials synthesized under basic conditions. By using CTABr as the surfactant, the final PMO materials show a 2-D hexagonal (p6mm) mesophase, while PMO materials with cubic (Pm (3) over barn ) mesostructure are obtained when CTACl or CTA(SO4)(1)/(2) are used. With gradually replacing CTABr by CTACl or CTA(SO4) (1)/(2) while keeping the total surfactant concentration constant, a clear p6mm to Pm (3) over barn 3n mesophase evolution process is observed. For a given gel composition, the mesophase of ethanebridged PMO materials can also be adjusted by the addition of different sodium salts. In short, the effect of the counterions on the mesophase can be attributed to the binding strength of the ions on the surfactant micelles, which follows the Hofmeister series (SO42- < Cl- < Br-< NO3- < SCN-). Furthermore, it is found that the hydrolysis and condensation rate of the organosilica precursor also plays an important role in the formation of the final mesostructure
E-info
https://repository.uantwerpen.be/docman/irua/08c392/9710.pdf
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