Carbon nanotubes (CNTs) bonded to dodecylamine groups were obtained by chemical modification. The
modified CNTs showed improved solubility in organic solvents and miscibility with polymer matrix. The
photoconductivity of oxotitanium phthalocyanine (TiOPc) doped with modified CNTs was investigated by
the xerographic photoinduced discharge method. The results showed that the photosensitivity of the dual-layer photoreceptor (P/R) with modified CNT/TiOPc composite as charge generation material was higher
than that with pristine TiOPc and increased with increasing the content of modified CNTs in the composites.
It was explained that, as demonstrated by X-ray photoelectron spectroscopy (XPS), after doping with modified
CNTs, the intramolecular charge transfer occurred in TiOPc and the charge-transfer exciton was prone to be
produced, which was favorable to charge carrier generation. The efficiency of charge carrier separation increased
as well because of the photoinduced charge transfer between TiOPc and CNTs, which might also contribute
to the improved photosensitivity of the modified CNT/TiOPc composites.
Novel biphasic calcium phosphate (BCP) powders composed of alpha-tricalcium phosphate (alpha-TCP) and hydroxyapatite (HA) were prepared by thermal decomposition of carbonated amorphous calcium phosphates (CACP). At first, the CACP precipitates were synthesized by adding ammonium carbonate in the presence of poly(ethylene glycol) at pH 10 with an initial Ca/P molar ratio of 1.60 at 5 degrees C. The Ca/P molar ratios of the CACP precursors are between 1.50 and 1.67 investigated by ICP. Then BCP (alpha-TCP/HA) powders were obtained after heating the CACP precursors at relatively low temperature (800 degrees C) for 3 h. alpha-TCP/HA powders were characterized by X-ray diffractometry, Fourier transform infrared spectra, transmission electron microscopy/scanning electron microscopy, and sedimentation experiment. The results show that alpha-TCP and HA phases form in one powder, alpha-TCP/HA powders are sphere with the diameter of 300 nm to less than 100 nm varied with their chemical compositions and the ratio of alpha-TCP and HA in the powders can be adjusted by the adding amount of carbonates. The possible formation process of biphasic alpha-TCP/HA powders was proposed.
Defluorination of 1-fluoronaphthalene was catalyzed by CpTiCl3 and an alkyl Grignard reagent system.
The reaction of 1-fluoronaphthalene, however, with 3 equiv of phenethylmagnesium chloride in the
presence of a catalytic amount of transition metal catalysts afforded 1-(1-phenethyl)naphthalene in good
yield via isomerization of the phenethyl group. Among the examined catalysts, CpTiCl3 and TaCl5 showed
much higher activity than the others. The similar coupling reactions of phenethylmagnesium chloride
with substituted fluoroarenes proceeded with high regioselectivity at the para-position to produce the
corresponding 1-phenethylarenes in good yields.
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