Normally citrate ions are surrounding gold nanoparticles when we use citrate salts to reduce the Au precursors. Does it mean that Au NPs are positively charged after reduction? Is that why citrate ions come and protect them via electrostatic interactions? Or NPs are neutral, and there is only a shift of electron cloud of surface atoms due to surrounding ions? In that case positively charged ions should also be able to do the same job as negative ions do, right?
Hi Ghulam,
Have a look at this attached review article (available online) and I suppose this article would answer a lot of your question, if not all.
Cheers
Santanu
http://www.scielo.br/scielo.php?pid=S0103-50532010000700003&script=sci_arttext
refer this paper i think it can answer your queries
Conde, Joao, et al. "Design of multifunctional gold nanoparticles for in vitro and in vivo gene silencing." ACS nano 6.9 (2012): 8316-8324.
this is a great paper to cover your most of concerns.
http://www.sciencedirect.com/science/article/pii/S0010854512002305
@ Ghulam Jalani
Did you get answer to your question ?
What is the charge on bare gold nanoparticles? Why do citrate ions attach on the surface of GNPs?
Thank you
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