A facile, green strategy is explored to obtain mesoporous titanium glycolate (Ti(OCH2CH2O)(2)) via a one-pot hydrothermal reaction. The mesoporous Ti(OCH2CH2O)(2) nanomaterials take on a three-dimensional V-type strip...
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A facile, green strategy is explored to obtain mesoporous titanium glycolate (Ti(OCH2CH2O)(2)) via a one-pot hydrothermal reaction. The mesoporous Ti(OCH2CH2O)(2) nanomaterials take on a three-dimensional V-type stripe structure with a specific surface area of 246.5 m(2) g(-1) and present an excellent adsorption capacity of toxic heavy metal ions in aqueous solution, 225.73mg g(-1) for Pb(II), 131.93 mg g(-1) for As(V) and 156.01 mg g-1 for As(III) with fast adsorption rates. The removal mechanism was found to derive from the electrostatic interaction or coordination interaction between Ti(OCH2CH2O)(2) and heavy metal ions in aqueous solution since the mesoporous materials display a pH-dependent effect for arsenic removal.
Ethylenediamine (EDA) functionalized fullerene nanoparticles as independent electron transport layers (ETLs) for inverted polymer solar cells exhibited high electronic conductivity and low work function. Compared with...
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Ethylenediamine (EDA) functionalized fullerene nanoparticles as independent electron transport layers (ETLs) for inverted polymer solar cells exhibited high electronic conductivity and low work function. Compared with ZnO, the power conversion efficiency of the devices based on PTB7-Th:PC71BM was increased from 9.1% to 10.06% with C-60-EDA ETLs and to 9.49% with Gd@C-82-EDA, mainly due to the greatly improved short current density.
One of the main topics in population genetics is identification of adaptive selection among populations. For this purpose, population history should be correctly inferred to evaluate the effect of random drift and exc...
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One of the main topics in population genetics is identification of adaptive selection among populations. For this purpose, population history should be correctly inferred to evaluate the effect of random drift and exclude it in selection identification. With the rapid progress in genomics in the past decade, vast genomescale variations are available for population genetic analysis, which however requires more sophisticated models to infer species' demographic history and robust methods to detect local adaptation. Here we aim to review what have been achieved in the fields of demographic modeling and selection detection. We summarize their rationales, implementations, and some classical applications. We also propose that some widely-used methods can be improved in both theoretical and practical aspects in near future.
We design and synthesize four fused-ring electron acceptors based on-6,6,12,12-tetrakis(4-hexylphenyl)-indacenobis(dithieno[3,2-b-2',3'-d]thiophene) as the electron-rich unit and 1,1-dicyanomethylene-3-indanon...
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We design and synthesize four fused-ring electron acceptors based on-6,6,12,12-tetrakis(4-hexylphenyl)-indacenobis(dithieno[3,2-b-2',3'-d]thiophene) as the electron-rich unit and 1,1-dicyanomethylene-3-indanones with 0-2 fluorine substituents as the electron-deficient units. These four molecules exhibit broad (550-850 nm) and strong absorption with high extinction coefficients of (2.1-2.5) x 10(5) M-1 cm(-1). Fluorine substitution downshifts the LUMO energy level, red-shifts the absorption spectrum, and enhances electron mobility. The polymer solar cells based on the fluorinated electron acceptors exhibit power conversion efficiencies as high as 11.5%, much higher than that of their nonfluorinated counterpart (7.7%). We investigate the effects of the fluorine atom number and position on electronic properties, charge transport, film morphology, and photovoltaic properties.
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