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The conditioning history of amorphous syndiotactic polystyrene (sPS) in mild supercritical CO2 (scCO2) changes significantly the thermal behavior and crystal phase transformation of sPS in further thermal treatment by inducing the formation of helical segments. The results of differential scanning calorimetry and temperature-dependent Fourier transform infrared spectroscopy show that polymer chains...
A variety of amorphous manganese oxide electrode materials with uniform nonspherical hollow interiors are prepared via sacrificial template-engaged redox etching of the corresponding shape-controlled Cu 2 O nanocrystals in KMnO 4 aqueous solution at room temperature. The obtained materials are characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy,...
The manganese oxide nanosheets (MnO 2 ) with negative charge and the functionalized carbon nanotubes (CNTs) with positive charge are selected as assembling blocks, and the manganese oxide nanosheets and functionalized carbon nanotubes hybrid material (CNTs–MnO 2 hybrid material) is fabricated by an assembling flocculation method. The restacking process of the manganese oxide nanosheets...
A great number of mathematicians have paid their attention to the calculation of PI. They hope to find a method not only fast in speed but also high in accuracy. With the rapid development of computer technology today, computer numerical calculation, an important technology in scientific research, makes the comparisons among different complicated calculations possible. According to the calculation...
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