Hello Mauro and thank you for your kind update, how may I reach Behzad please?

Best:)

Joel

My understanding is that hollow NPs are preferred exploiting less in vivo toxicity, imaging, drug carrying techniques etc. but just not always thermodynamically possible and therefore then solid. (However there may be instances where all solid is preferred i.e. gathering more heat to the NP that I am just not savvy to, feel free to add :) .)