Poly(/3-hydroxy butyrate) 735 lations seem to be fully justified. The average temperature coefficient d In (r^o/dT, in the range 0-90°, is also reported in Figure 9: it is always negative and rather small, being in the range from -0.1 to -0.4 X 10"3. It compares very well with viscosimetric measurements (-0.28 X 10"3 from 30 to 130°),27 and also with stresstemperature results on rubberlike samples (from -0.08 to -0.27 X 10"3 in the range 18-95°).28
ConclusionsWe wish to stress particularly a conclusion arising from the present study, concerning the effect of the (27) J.
This
study adopts a simple but facile process for preparing silver-doped
magnetic nanoparticles by the spontaneous oxidation–reduction/coprecipitation
method. The preparation can be achieved in one pot with a single step,
and the prepared silver-doped magnetic nanoparticles were utilized
as nanocatalysts for the reduction of
o
-nitroaniline.
Utilizing the magnetic characteristics of the prepared nanoparticles,
the catalytic reactions can be carried out under quasi-homogeneous
condition and the nanocatalysts can be easily collected after the
conversion is achieved. It can be revealed from the results that the
morphologies and the composition of the prepared silver-doped magnetic
nanoparticles can be adjusted by changing the conditions during the
production, which affects the efficacy of the catalysis. In addition,
the catalysis efficiency is also controlled by the pH, temperature,
and the amounts of nanocatalysts used during the catalytic reaction.
Finally, the silver-doped magnetic nanocatalysts prepared in this
study own the advantages of easy preparation, room-temperature catalysis,
high conversion ability, and recyclability, which make them more applicable
in real utilities.
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