Controlling the size, shape and structure of nanocrystals is technologically important
because of the strong effect of size and shape on optical, electrical, and catalytic
properties. Monodispersed nanocrystals of copper oxide were prepared by the
precipitation–pyrolysis method. By controlling the starting materials, reactive
concentration and annealing temperature, we can obtain spherical monodispersed CuO
nanocrystals of different sizes or rodlike CuO nanocrystals. The particle sizes
of CuO monodispersed nanocrystals can be tuned in the range between and 30 nm. The products have been characterized by x-ray diffraction, transmission
electron microscopy, high-resolution transmission electron microscopy and the UV–visible
absorption spectrum. The absorption spectra of CuO nanocrystals show clear evidence of
the quantum size effect. The possible formation mechanism of monodispersed CuO
nanocrystals is discussed.
Ce doped ZnO (Ce-ZnO) nano materials with different Ce molar content were prepared via chemical precipitation method. The morphology of Ce-ZnO was rod like and the size was decreased with the increase of doping amount, and the size of Ce-ZnO was 180 nm in length and 40 nm in diameter when the doping amount is 2.5%. All the samples were treated on cotton fabric, the laden fabric has excellent performance on hydrophobicity, UV resistance and antibacterial activity. The contact angle of fabric loaded with ZnO was 103°, and fabric with 2.5% Ce-ZnO was 148°. The fabric loaded with Ce-ZnO has superior performance of UV resistance. With the increase of doping amount, the antibacterial rates were promoted and then reduced, the antibacterial rates against S. aureus and C. albicans of fabric with 2.5% Ce-ZnO were promoted to 83% and 85%, however, the antibacterial activity against E. coil was reduced to 78%.
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