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Which of the following is an environment friendly preparation method of polymer nanoparticles?

Which of the following is an environment friendly preparation method of polymer nanoparticles? Correct Answer Ultrasonication

Flame spray synthesis, Sol-gel method, Citrate method are various processes of production of nano ceramics. Ultrasonication is an eco-friendly technique for production of nano polymers. This method is advantageous because it is non-toxic, produces extremely small particles and has rapid reaction rate.

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