Spectrofluorimetric studies of water content in sol—gel processing of TMOS
Marek Wasiucionek , M.W. Breiter
AbstractMeasurements of water during acid-catalyzed sol—gel processing TMOS have been carried out. The compositions of the initial sols correspond to TMOS:H2O:MeOH=1:n:3, where n = 1, 2, 4, 6, 8, 15 and 25. Pyranine, a sensitive water photoprobe enables monitoring fast water content changes. Initial decrease of water content due to hydrolysis of TMOS was fast for sols corresponding to (n ≥ 15). A minimum was reached in about 1 min. For n ≤ 2 these changes were much slower. Subsequent increase of water was caused by condensation reactions. Changes of water content and mass which occur more rapidly after pin-holing the seals of cuvettes containing sols—gels are caused by evaporation of pore liquid. The results of the numerical fits of these changes suggest that this liquid consists mainly of H2O and MeOH.
|Journal series||Journal of Non-Crystalline Solids, ISSN 0022-3093|
|ASJC Classification||; ; ;|
|Publication indicators||= 11; = 11; = 12.0; : 1999 = 0.956; : 2006 = 1.362 (2) - 2007=1.494 (5)|
|Citation count*||12 (2014-12-12)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.