Question

a. What is the driving force for the sintering process? b. How about the Ostwald ripening...

a. What is the driving force for the sintering process?

b. How about the Ostwald ripening process?

c. Explain the Ostwald ripening process of particles in the liquid medium.

Engineering   Chemical-Engineering   
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Answer #1

(a) The driving force for the sintering process is reduction of surface energy of the particles which is caused by decreasing their vapour-solid interface.

(b) Ostwald ripening occurs through the dissolution of matter at regions with a small radius of curvature and re-precipitation at regions with a large radius of curvature.

(c) In an oil-in-water emulsion polymerization, Ostwald ripening causes the diffusion of monomers from smaller to larger droplets due to greater solubility of the single monomer molecules in the larger monomer droplets. The rate of this diffusion process is linked to the solubility of the monomer in the continuous (water) phase of the emulsion.

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