Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 45 , Issue 8
Showing 1-50 articles out of 63 articles from the selected issue
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  • Shigeo Sasahara, Keiichiro Kaida, Sumio Ozeki
    2016 Volume 45 Issue 8 Pages 895-897
    Published: August 05, 2016
    Released: August 05, 2016
    [Advance publication] Released: June 11, 2016
    JOURNALS RESTRICTED ACCESS
    Magnetic field effects on silica gel formation from aqueous silicate solutions were examined by 29Si NMR, viscosity, and N2 adsorption measurements. 29Si NMR spectra were analyzed by the multivariate curve resolution to give three principal spectra, which may correspond to oligomeric species, polymeric species, and microgels. A 6 T magnetic field promoted the formation of polymeric species and the transformation of polymeric species to microgels. In addition, the magnetic field reduced the viscosity of the silicate solutions, suggesting depression of particle growth and interactions among silanol groups on particles under magnetic fields. Such magnetic field effects may relate to magnetic orientation and hydration of polymeric species and microgels.
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  • Zhuo Ma, Dongfeng Chai, Dechun Wen, Haowen Wang, Yunfei Hu, Yunfeng Qi ...
    2016 Volume 45 Issue 8 Pages 958-960
    Published: August 05, 2016
    Released: August 05, 2016
    [Advance publication] Released: May 12, 2016
    JOURNALS OPEN ACCESS
    Polyoxometalates possess unique electron-accepting ability while maintaining their structures; this makes them effective electron mediators in semiconductor-based optoelectronic system via retarding the photoexcited electron–hole recombination. H3PW12O40 (PW12) was introduced into TiO2 film using layer-by-layer method in the presence of reduced graphene oxide, serving as a conductive additive. The composite film had smooth surface and dense packing of TiO2 nanoparticles, and showed enhanced transient photocurrent compared to the films without PW12 or reduced graphene oxide (rGO). IV measurement further confirmed that the power conversion efficiency of PW12/rGO/TiO2 film was remarkably improved compared to those of the films without PW12 or rGO. PW12 functions as an electron mediator and rGO serves as a conductive agent for enhancing the photocurrent and power conversion efficiency, due to the efficient dissociation of excitons and fast electron transfer.
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