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Probing the Sol–Gel Conversion in the Tetraethoxysilane/Alcohol/Water System with the Aid of Diffusion-Controlled Fluorescence Quenching by T.A. Kikteva; B.V. Zhmud; N.P. Smirnova; A.M. Eremenko; Yu. Polevaya; M. Ottolenghi is a Chemistry article available to read on EtoBox.
What is Probing the Sol–Gel Conversion in the Tetraethoxysilane/Alcohol/Water System with the Aid of Diffusion-Controlled Fluorescence Quenching about?
of ortho-phenanthrolyne, which is known to form stable che-The sol-gel conversion in the tetraethoxysilane/alcohol/water late complexes with the aforesaid ions, the ESR spectra can system can be probed by means of the diffusion-controlled fluores-''sense'' the moment that the sol-gel conversion occurs. cence quenching of Py\* by Cu 2/ ions. In the course of tetraethoxy-The use of the word ''moment'' here is justified in view of silane hydrolysis, the viscosity of the system increases, thereby the fact that the duration of sol-gel transformation is norcausing the quenching rate to decrease and the mean lifetime of mally many orders of magnitude shorter than the duration the excited state to elongate dramatically as the system approaches of the initiation stage, as well as the stage of gel ripening. the gel-point. Incorporating the equation proposed by Vogels-It has also been reported that the sol-gel conversion in the berger et al. (1992) for the time-dependence of the viscosity of TEOS/alcohol/water system can be detected by the change gelating systems into the Smoluchowsky kinetic equation, an equation has been proposed to describe the observed time-dependence in the fluorescence
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- Author
- T.A. Kikteva; B.V. Zhmud; N.P. Smirnova; A.M. Eremenko; Yu. Polevaya; M. Ottolenghi
- Publisher
- Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)
- Published
- 1997
- Language
- EN
- Field
- Chemistry (Physical Sciences)