Sol- Gel Technology
Aytan Muradova
Introduction
• Hydrolyses• Polymerization• Growth of nanostructures• Agglomeration
The prime requisite for obtaining good quality in this technology
• Variation of PH• Temperature• Time• Concentration of Reagent• Concentration of Catalyzor• H2O/Si• Phase transition Sol Gel• Drying
Sol- Gel ProcessingRO Me or Me salt
+H2O Stabilizer
Nanodisperse Oxide Sol(Particulate or Polymeric)
-H2O
Gel
Xerogel
Porous Oxide
-H2O
T > 400 C-H2O
-Stabilizer
For example
OHHClOHHCSiOHC 252452 )(
OHHClOHHCSiOHC 252452 )( OHHClOHHCSiOHC 252452 )(
OHHClOHHCSiOHC 252452 )( OHHClOHHCSiOHC 252452 )(
2SiO
OHHClOHHCSiOHC 252452 )(
With diameter20-50nm Nitration with NaOH
aerosol
Annealing with 600- 1000 C
Homogeneous mixture
Drying
Gel
Sol
Xerogel
Nitration with NH4OH
Drying in air
Adding (CuNO3)2
Glass of Nanoparticles
Drying with H in 1200 C and 1atm
Preparation of thin films
• RO3=Si-OR + H2O (RO)3=Si-O-Si+ R-OH (Hydrolyses)• (RO)3=Si-OH+(RO)3=Si-OR (RO)3=Si-OSi=(RO)3+ ROH• (RO)3=Si-OH+HO-Si+(RO)3 (RO)3+Si-O-Si=(RO)3+H2O
Thank you for attention!