James Heath and coworkers Phys Rev Lett 1995 75 3466 have ob

James Heath and coworkers (Phys. Rev. Lett. 1995, 75, 3466) have observed Ostwald ripening in thin films of gold nanoparticles at room temperature. Starting with an uneven distribution of particle sizes, they find that the large particles grow at the expense of smaller ones (see

Solution

Large particles grow at teh expense of small ones because of aggregations. small nanoparticles clump together to from an agregate thus smaller ones combione to form larger particles as time passes by, size of particles increases because of clumping.