Dear Dr. Vikram Jadhav ,

under different calcination temperature the trends of pore size distributions of nano CaO were not uniform. The grain growth rate constant C is influenced by the calcination temperature. Under calcinations at 750◦C, 800◦C, 850◦C and 900◦C, C was calculated 10, 17, 33 and 57, respectively. When C was 10–17, the grain growth of nano CaO was relatively slow. Small grains coalesced and grew to large grains resulted to the original mesopores between small grains disappeared and transformed tomicropores with smaller space. The pore size tended to be micro-porous. However, when C continued to increase to 33, the small grains grew rapidly and the micropores sharply decreased when the grain size of CaO grew over 100 nm. When C was 57, the grainsize of CaO was already more than 100 nm over 120 min calcination. The pore size tended to be nonporous. As discussed above, this finding indicated that when sintering was mild, the pore size tended to be microporous at low grain growth speeds, whereas the materia ltended to be nonporous at rapid grain growth speeds, which was attributed to severe sintering.

For more details, please see the source:

- Nano CaO grain characteristics and growth model under calcination

Yanqing Zhu, Su Fang Wu, Xieqing Wang

Chemical Engineering Journal 175(1):512-518 (2011)

Available on RG, as full text, at: https://www.researchgate.net/publication/251673452_Nano_CaO_grain_characteristics_and_growth_model_under_calcination

My best regards, Pierluigi Traverso.

Dear Dr. Vikram Jadhav ,

under different calcination temperature the trends of pore size distributions of nano CaO were not uniform. The grain growth rate constant C is influenced by the calcination temperature. Under calcinations at 750◦C, 800◦C, 850◦C and 900◦C, C was calculated 10, 17, 33 and 57, respectively. When C was 10–17, the grain growth of nano CaO was relatively slow. Small grains coalesced and grew to large grains resulted to the original mesopores between small grains disappeared and transformed tomicropores with smaller space. The pore size tended to be micro-porous. However, when C continued to increase to 33, the small grains grew rapidly and the micropores sharply decreased when the grain size of CaO grew over 100 nm. When C was 57, the grainsize of CaO was already more than 100 nm over 120 min calcination. The pore size tended to be nonporous. As discussed above, this finding indicated that when sintering was mild, the pore size tended to be microporous at low grain growth speeds, whereas the materia ltended to be nonporous at rapid grain growth speeds, which was attributed to severe sintering.

For more details, please see the source:

- Nano CaO grain characteristics and growth model under calcination

Yanqing Zhu, Su Fang Wu, Xieqing Wang

Chemical Engineering Journal 175(1):512-518 (2011)

Available on RG, as full text, at: https://www.researchgate.net/publication/251673452_Nano_CaO_grain_characteristics_and_growth_model_under_calcination

My best regards, Pierluigi Traverso.

Very much thanku you sir ....

Vikram Jadhav

There is a disconnect in your sentence between 'calcium oxide nanoparticles' and 650 degree temp.'

Watch this webinar (registration required) - slides 9 onward) to see why:

Dispersion and nanotechnology

https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W190528DispNanoMat

See the graph plot on slide 11.

@Alan F Rawale sir ..I am synthesizing plant mediated CaO NPs, in this experiment I made Calcium hydroxide and did its calcination at a temperature of 923 K , then why it shows black color? Is it CaO Nps shows black color at this temp?