Pd colloid containing Ormocers (organically modified ceramics) have been prepared from Pd amino complexes of the type Pd[NH 2CH 2CH 2NH(CH 2) 3Si(OMe) 3] 2ac 2 by hydrolysis and condensation (sol-gel reaction) of the silane together with Si(OEt) 4 and Si(OEt) 3(CH 2) 3OCH 2CHCH 2O. The amino complex formation is necessary to avoid spontaneous reduction and uncontrolled colloid formations in the liquid phase. This synthesis route leads to Pd colloid containing powders and coatings on glass. By thermal curing (temperatures up to 500 °C) using different atmospheric conditions (N 2, Ar, H 2/N 2) brown to deep black coatings on glass with transmission values from 80 to 0 % can be obtained. The average particle size can be controlled by varying the molar ratio of the used Pd salt (Pd(ac) 2) and the aminosilane.
Nano sized Pd particles in a SiO 2 matrix by sol-gel processing
LICCIULLI, ANTONIO ALESSANDRO
1994-01-01
Abstract
Pd colloid containing Ormocers (organically modified ceramics) have been prepared from Pd amino complexes of the type Pd[NH 2CH 2CH 2NH(CH 2) 3Si(OMe) 3] 2ac 2 by hydrolysis and condensation (sol-gel reaction) of the silane together with Si(OEt) 4 and Si(OEt) 3(CH 2) 3OCH 2CHCH 2O. The amino complex formation is necessary to avoid spontaneous reduction and uncontrolled colloid formations in the liquid phase. This synthesis route leads to Pd colloid containing powders and coatings on glass. By thermal curing (temperatures up to 500 °C) using different atmospheric conditions (N 2, Ar, H 2/N 2) brown to deep black coatings on glass with transmission values from 80 to 0 % can be obtained. The average particle size can be controlled by varying the molar ratio of the used Pd salt (Pd(ac) 2) and the aminosilane.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
