Toxicity assessment of silica nanoparticles, functionalised silica nanoparticles, and HASE-grafted silica nanoparticles

► The functionalisation of silica NPs does not induce an increase of toxicity. ► The grafting of silica NPs on HASE polymer does not induce an increase of toxicity. ► The test on micro-crustacean Daphnia magna was the most sensitive acute test. ► The test on algae Phaeodactylum tricornutum was the most sensitive chronic test.