Y2O2S:Yb/Ho-silica/aminosilane core-shell nanoparticles were prepared by a solid-gas method in combination with polyvinylpyr-rolidone assisted one-step ammoniating method. The core was a single Y2O2S:Yb/Ho with 80 nm in diameter and the shell was silica/aminosilane with around 5 nm in thickness. The results of sedimentation experiment indicated that the nanoparticles could be well-dispersed in ethanol and water to form stable colloids. Since the coating weakened lattice vibration energies of the Y2O2S:Yb/Ho...
Cytotoxicities of nickel oxide nanoparticles（NiO NPs） with average diameter of 20 nln were investigated on cultured Chlorella vulgaris. Alga growth-inhibition tests were taken and ultrastrueture changes of the microalgae were characterized with transmission electron microscopy（TEM）. The biological interface conversion effect between NiO nanoparticles and Chlorella vulgaris was studied by X-ray diffraction（XRD）, high-resolution transmission elec- tron microscopy（HRTEM） and X-ray photoelectron spectroscopy（XPS）. The results indicated that the NiO nanopar- tides had severe inhibitory effect on the growth of microalgae, with a 96 h ECs0 value of 31.4 mg/L. Under the expo- sure to NiO NPs suspensions, ChloreIIa vulgaris cells showed plasmolysis with a shriveled cell shape, disrupted plas- ma membrane, leaked cytosol and disordered thylakoid grana lamella. The NiO NPs were aggregated and partially re- duced to Ni0 inside the Chlorella vulgaris. The bioaccumulation and bio-reduction ability of Chlorella vulgaris provide us with a possible strategy of remediation of aquatic pollution conducted by toxic metal oxide nanoparticles.
LI YongqingXIAO RanLIU ZonglaiLIANG XijuanFENG Wei
