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!