Pechini Synthesis

Spray pyrolysis, sol gel, Pechini indeed, powder milling, even sputtering (on quite special conditions).. but what is your size goal and your experimental capabilities?

Flame spray pyrolysis (FSP) is a good technique for synthesis with controlled size and crystallinity in one step.

Precursor (Cerium(III) acetate hydrate) is dissolved in glacial acetic acid at 80 °C. Liquid precursor feed is supplied by a syringe pump and atomized with oxygen resulting in a fine spray.An oxygen sheath flow surrounding the spray flame is supplied from the center of nozzle. Premixed methane/oxygen gas flows through the chamber at controlled rate. The Ceria nano particles produced will be collected on a glass fiber filter  with the aid of a vacuum pump.

Ceria nanoparticles can also synthesized by means of precipitation method.

 Dear Anas,

please explain Ceria nanoparticles synthesis method by means of precipitation .

The methods being suggested are fine. I like to add few more areas like hydrothermal synthesis, Ball milling/planetary ball milling and more. If the facilities are limited you try by organic precursor route. Add metallic salt (Chloride/nitrate(simple or complex)) to a sodium salt to dicarboxylic/ monocarboxylic (medium/long chain: succnic acid, adipic acid, oleic acid etc.) acid and react at room or slightly higher temperature. Wash the precipitate obtained. Dry it and do the DSC study. Get the calcination temperature which indicates phase formation. Calcine at that temperature in furnace in small amount as the product first burn and then phase formation takes place. Take out powders. Do the compaction and calcinate for solid phase diffusion and getting the final product. 

Dear Abbas,

Hydrated Cerium nitrate precursor is added to water-isopropanol mixture and stirred vigorously. Aqueous ammonia is also added to it. The reaction takes place at room temperature. Some alkaline solution to be added to stabilize pH above 9. After drying, you will get yellow powders representing ceria nanoparticles.

For more details, refer to the kink below

http://dx.doi.org/10.1155/2013/589382

Let me know if it works for U..

Dear Anas,

Thanks.

have a good time.

Regards,

A.Rahdar

Dear Anas

Another recipe is below;

''Nanoceria was synthesized in water by simple oxidation of cerium ions using a suitable oxidizer. A 0.5−0.7 g amount of cerium(III) nitrate hexahydrate (Sigma Aldrich) was dissolved in 50 mL of deionized water (18.2 MΩ). The solution containing Ce(III) ions was then oxidized using 0.2 mL of hydrogen peroxide (30% w/w Sigma Aldrich) for acidic oxidation and 0.05 mL of ammonia for base-mediated oxidation (30% w/w Sigma Aldrich).'' http://pubs.acs.org/doi/full/10.1021/jp076164k

Cheers

The metal precursors solutions (Cerium (III) sulphate) was precipitated using potassium hydroxide as a precipitating agent, the precipitating agent

was added drop wise to the precursors solutions during ultra sonication for 0.5 hr then the precipitate was washed with distilled water

and ethanol, dried at 105oC and finally fired at 500oC for about 3 hrs.

referance

M.H.Khedr, M.I.Nasr, K.S.Abdel Halim,A.A.Farghali, N.K.Soliman,CO oxidation over various nanostructured metal oxides,International Journal of Advanced Research (2014), Volume 2, Issue7, 593-606

Hi Abbas,

CeO2 Nanoparticles have been synthesized in our lab using co-precipitation method. For this purpose, molar ratio method is used to control the concentration of reactants. Cerium nitrate (CeNO3) is used as precursor. A strong base, sodium hydroxide (NaOH) is used to maintain the required pH value of solution. Particle size distribution is controlled by using acetic acid (CH3COOH) as a surfactant. Distilled water is used as solvent in the solution. The reaction is carried out under constant heating and vigorous stirring.

A 0.1M solution was prepared using 2.17 gm Cerrium Niterate (CeNO3).6H2O in 50ml distilled water in a beaker. The solution was put for 30 min into fume hood on hot plate for magnetic stirring at 100 °C and 600 rotations per minute (rpm). 2ml Acetic acid (CH3COOH) was added to solution to control particle size. Then sodium hydroxide (NaOH) was added drop by drop in the solution to increase the pH value of the solution, which resulted in nucleation (the basic phenomena of precipitate formation in chemical co-precipitation). Precipitates starts appearing when pH reaches 8. Furthermore addition of NaOH was stopped as the pH reaches to 10. Then the solution was left for stirring for 1 hour at 100 °C and 700 rpm. Then the solution was kept for sedimentation at room temperature for 1 hour. Precipitates settled down and the extra water was removed. Then the rest of solution was centrifuged for 2 minutes at 3000 rpm. Impurities were separated from the solution as the precipitates settled down which were collected in a beaker and kept in the oven for drying overnight at 80 °C. Next day the dried sample was grinded to powder form and put in oven at 180 °C for 2 hrs for decomposition. Then the sample was annealed in a furnace for 2 hours at 300 °C.

Good luck

 Dear Muhammad

very very very thanks.

regards,

Abbas

Dear Anton  

thanks due to valuable protocol.

regards,

Abbas