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Effect of the hard-biocorona on the ζ-potential of the nanometric TiO2 samples. ζ-potential vs. pH measured in water of the pristine samples and of the samples treated in saliva, gastric and duodenal with and without proteins and washed to remove molecules weakly adsorbed. (A,C,E): TiO2-NM1; (B,D,F): TiO2-NM1.
