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. 2016 Nov 24;6:37761. doi: 10.1038/srep37761

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Free energy profile of the adsorption of Arginine on the TiO₂ NP surface and representative configurations (A–D). The H-Bonds in the triad water-amino acid-TiO₂ NP, are indicated by green dash lines. (D) Water molecules in the first (FL) and second (SL) water layers are colored in purple and cyan, respectively.