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Target Concepts:
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Query: EC:4.1.2.42 (
DTA
)
1,693
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
The hybrid microspheres with polystyrene core coated by titania nanoparticles were prepared by miniemulsion polymerization, and the as-prepared samples were characterized by SEM, XRD, TG-
DTA
, XPS, and
SPS
techniques. TiO2 nanoparticles experienced two processes of phase transition, i.e., amorphous to anatase and anatase to rutile at the calcining temperature range from 400 to 1000 degrees C. The phase transformation temperature of TiO2 hybrid microspheres from anatase to rutile was increased by about 300 degrees C due to the blocking function of calcined polymer remainder.
SPS
results present that the band-gap of hybrid microspheres is 3.2-3.4 eV, which is larger than that of pure TiO2. The maximum intensity of the
SPS
signal is about 3 times larger for the hybrid material as compared to the pure TiO2. In addition, the photocatalytic degradation rate of TiO2 hybrid microspheres was 15% faster than that of pure TiO2 in the experiment of the photocatalytic degradation of methyl orange.
...
PMID:Crystallization and photovoltaic properties of titania-coated polystyrene hybrid microspheres and their photocatalytic activity. 1685 28
