Silica hydrogel formation and aging monitored by pyrene-based fluorescence probes View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2010-05-05

AUTHORS

Tomáš Nedelčev, Igor Krupa, Pavol Hrdlovič, Jozef Kollár, Dušan Chorvát, Igor Lacík

ABSTRACT

Fluorescent probes pyrene (Py), di(1-pyrenylmethyl)ether (DiPyM) and newly synthesized 2,3-bis-[4-(1-pyrenemethoxy)methylphenyl]butane (DiPyS) were used to monitor the formation and aging of silica hydrogel prepared from poly(glyceryl silicate) (PGS) sol. The fluorescence emission spectra of these probes are sensitive to their environment and this feature is utilized for monitoring the evolution of silica hydrogels prepared in this work. The polarity of hydrogel matrix during sol–gel transition assessed by all three pyrene probes decreases in the first stage of hydrogel formation, for about 2 h, followed by a gradual increase in polarity and reaching the constant level after 24 h for at least 2 weeks. The process of crosslinking was assessed by DiPyM and DiPyS. These fluorescent probes possess two pyrene structures, which ability to form a dynamic intramolecular excimer can be used to monitor the degree of hydrogel crosslinking with time. These data support the polarity measurements that the hydrogel network is predominatly formed within the first 2 h, stabilized within the 24 h, and that there is a minor increase in the network density for about 10 days until reaching the constant level. In addition, utilizing the second-order diffraction of scattered excitation light may also be used to obtain an adequate information about the silica hydrogel evolution. In summary, this paper demonstrates that pyrene-type fluorescent probes represent simple and precise tool for characterization of formation and aging of the silica hydrogels. More... »

PAGES

143-150

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10971-010-2226-5

DOI

http://dx.doi.org/10.1007/s10971-010-2226-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1003112261


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