کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
221292 | 463383 | 2006 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Analysis of the gelation process of hybrid silica–zirconia and silica–titania gels using two different grafted electroactive probes Analysis of the gelation process of hybrid silica–zirconia and silica–titania gels using two different grafted electroactive probes](/preview/png/221292.png)
Several conditions for the sol–gel polymerisation of hybrid silica–zirconia and silica–titania have been studied using specially tailored electrochemical probes. One of the probes has been designed to bind to the silica backbone, while the other has been designed to bind to the transition metal species. The results show that the silicon and the transition metal species play a quite different role in the polymerization course, and especially large differences between the zirconium and the titanium behaviour have been observed. It is shown unambiguously that while the zirconia species bind irreversibly to the silica gel, the titania ones remain very mobile whatever the advancement of the reaction and probably act only as catalysts for the siloxane polycondensation.
Journal: Journal of Electroanalytical Chemistry - Volume 598, Issues 1–2, 15 December 2006, Pages 15–21