What is sol-gel method in nanotechnology?

What is sol-gel method in nanotechnology?

The sol-gel process is a more chemical method (wet chemical method) for the synthesis of various nanostructures, especially metal oxide nanoparticles. In this method, the molecular precursor (usually metal alkoxide) is dissolved in water or alcohol and converted to gel by heating and stirring by hydrolysis/alcoholysis.

What are the advantages of sol-gel method?

The sol-gel method has the following advantages: (1) The obtained nanoparticles have good uniformity and high purity, (2) it is energy saving due to the low annealing temperature, and (3) it can be used to prepare coatings, fibers, and composite materials.

What is difference between sol and gel?

Sol is a liquid state of colloidal solution whereas gel is a solid or semisolid state of colloidal solution. No definite structure is present for sols whereas generally a honeycomb like structure is present for gel. A sol constitutes a uniformly dispersed solid in a fluid.

Who invented sol-gel method?

Dislich’s work gave a big impact on glass researchers. Sakka et al. (1974) published a sol–gel paper on preparation of TiO2–SiO2 amorphous materials at the 10th International Congress on Glass. Thereafter, sol–gel research was directed toward preparation of bulk oxide materials.

What is the purpose of sol-gel processing?

In materials science, the sol–gel process is a method for producing solid materials from small molecules. The method is used for the fabrication of metal oxides, especially the oxides of silicon (Si) and titanium (Ti).

What are the disadvantages of sol-gel method?

There are some disadvantages of the sol-gel process.

• The cost of the raw materials (the chemicals) may be high.
• There is often a large volume shrinkage and cracking during drying (we have to remove the “organics”).
• Organic chemistry often uses confusing terminology and is avoided by ceramists whenever possible.

What is the use of sol?

Sol–gel derived materials have diverse applications in optics, electronics, energy, space, (bio)sensors, medicine (e.g., controlled drug release), reactive material, and separation (e.g., chromatography) technology.

What is SolSol gel method 1?

sol gel method 1 NAME: SUKESH HEGDE 2 1 3 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

What is sol-gel method?

Sol-Gel Method. 1. SOL-GELMETHOD. 2.  involves the evolution of inorganic networks through the formation of a colloidal suspension (sol) and gelation of the sol to form a network in a continuous liquid phase (gel)

What are the steps involved in sol-gel methanol formation?

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 formation of the gel.

What is the general equation for sol-gel?

SOL-GEL METHOD 4. General equation: R : -CH3, -C2H5 etc. M: Si, Al, Ti etc. Example: 5. Example :