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Phys Chem Chem Phys. 2009 Dec 21;11(47):11258-63. doi: 10.1039/b915317a. Epub 2009 Oct 20.

Silver nanoparticles behave as hydrophobic solutes towards the liquid water structure in the interaction shell. A Raman study in the O-H stretching region.

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Dipartimento di Scienze Chimiche, Università di Catania, Viale A. Doria, 6, I-95125, Catania, Italy.


Weak interactions, never reported yet, between silver nanocolloids and water, have been studied by Raman spectroscopy in the O-H stretching region. Subtle interactions regarding the first hydration shell, and perturbing only at a short range the bulk liquid structure of the solvent have been revealed. The interface interactions cause the O-H stretching band of water in the interface layer spectrum to be shifted at higher wavenumbers with respect to the neat water Raman signals. Order/disorder ratio variations, with respect to the liquid spectrum of pure water, are reported.


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