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a) Schematic of a SFS experiment of water nanodroplets in oil. b) The spectral features for the D2O stretch vibrations of water nanodroplets in hydrophobic environments (black) are distinct from the corresponding data of planar interfaces (blue and red). The nanodroplets have more of strongly H-bonded vibrations appearing at ~2370 cm−1 and they lack the free OD groups at ~2745 cm−1. Reprinted with permission from ref. [174], copyright 2017 Nature Publishing Group.
