Silica modification of titania nanoparticles enhances photocatalytic production of reactive oxygen species without increasing toxicity potential <i>in vitro</i>.

Importantly, TiO 2 : SiO 2 _1 : 3_SD increased the levels of ROS in alveolar epithelial cells, as seen in macrophages, but the results did not reach statistical significance (at 40 μg cm −2 ).

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