Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5357873 | Applied Surface Science | 2010 | 4 Pages |
Abstract
DRIFT spectra of xerogels synthesized by co-condensation of tetraethoxysilane (or 1,2-bis(triethoxysilyl)ethane) and 3-aminopropyltriethoxysilane have been measured using termoevacuation in the temperature range 50-350 °C. The disappearance of bands related to the vibrations of water molecule with temperature growth and shifts of absorption band related to the deformation vibrations of amino groups to the high-frequency region have been observed. The formation of a new band in the range of 3650-3660 cmâ1 has been attributed to stretching vibrations of silanol groups. The simplest change of surface layer composition in the amino-containing xerogels by water removal results in transformation of one type of hydrogen bond to another. The first type is associated with forming of cyclical structure with participation of 3-aminopropyl and silanol groups and water molecule, [â¡Si(CH2)3H2N···HO(H)···HOSiâ¡], the other type is associated with the interaction of amino groups between each other.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Yu.L. Zub, N.V. Stolyarchuk, M. Barczak, A. DÄ
browski,