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In nano-particles, surface atoms have fewer neighboring atoms in compare to bulk atoms. Is there any difference between bond energy of surface atoms and bulk atoms?

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Yes, there is, as surface atoms and bulk atoms have different bond energies in nanoparticles. This is a reason why nano particles coagulate easily and special measures have to be taken to prevent coagulation.

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  • $\begingroup$ I'd point out that nanoparticles have a lot of weird behaviors that are not typical of a bulk solid. So for atom "neighborhoods" there are (1) bulk solid (2) surface of bulk solid (3) nanoparticles $\endgroup$
    – MaxW
    Commented Feb 13, 2017 at 16:32

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