What are the steps involved in sol gel process?

The sol–gel process is a wet chemical technique also known as chemical solution deposition, and involves several steps, in the following chronological order: hydrolysis and polycondensation, gelation, aging, drying, densification, and crystallization.

What is gel in sol gel method?

8.6 Sol-gel method Sol is a colloidal suspension of solid nanoparticles in monomer solution and gel is the three-dimensional interconnecting network formed between phases.

Can a sol become gel?

A sol can become a gel when the solid nanoparticles dispersed in it can join together to form a network of particles that spans the liquid.

Is sol gel method expensive?

One of the drawbacks of sol-gel method is its expensive raw materials, drying and sintering and its time- taking process16-20.

What is sol gel method Slideshare?

SOL-GEL METHD CONSISTS SEVARAL STEPS 1) SOL FORMATION: Hydrolysis of metal organic reactant in an organic solvent that is miscrible with water or inorganic salts in water results in formation of sol M-O-R + H2O M-OH + R-OH (hydrolysis) 2)GEL FORMATION: Condensation followed by polycondensation of sol results in the …

Why sol gel is bottom up approach?

13 Sol-gel approaches can be described as bottom up preparation methods in which the solid is obtained via a succession of inorganic polycondensation reactions between molecular precursors (Figure 1). The gel is then typically dried and calcined to produce the final solid material.

Is Sol Gel a bottom up approach?

What type of approach is sol gel method?

1. Sol-gel method is ________ approach. Explanation: Sol-gel method is the bottom up approach for synthesis of nano materials. This process is mainly used to synthesize the nano materials.

Which precursors are used in sol gel technique?

Typical precursors are metal alkoxides and metal chlorides, which undergo hydrolysis and polycondensation reactions to form a colloid. The basic structure or morphology of the solid phase can range anywhere from discrete colloidal particles to continuous chain-like polymer networks.

Why sol gel method is best?

One advantage of the sol–gel technique is that it is an easy and very cheap process to prepare metal oxides and allows control over the doping process or addition of transition metals, as compared to other preparation techniques.

What is sol gel used for?

Sol gel technology can be used to prepare fibers, microspheres, thin films, fine powders and monoliths. Applications for sol gel technology include protective coatings, catalysts, piezoelectric devices, wave-guides, lenses, high-strength ceramics, superconductors, synthesis of nanoparticles and insulating materials.

What is sol gel method PDF?

Sol-gel method is a method, for material preparation under mild condition, of solidifying a compound containing a highly chemically active component through a solution, sol, or gel, and then heat-treating an oxide or other compound.

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