查看更多>>摘要：During the experiment of preparing ITO (Indium Tin Oxide) nanopowder,a new complex salt crystal K3[InCl6] was found and synthesized using a solution growth method.The diffraction pattern,morphology,element composition and structure of the crystal were analyzed by XRD,SEM and CCD.The results implied that K3[InCl6] is monoclinic,is of the space group P21/c,has a chemical formula of K3[InCl6],a Z=4 and with the following cell parameters:a=12.188 (A),b=7.553 (A),c=12.703 (A),α=90.00°,β=108.96°,γ =90.00°,v= 1105.98 (A)3.
查看更多>>摘要：Manganese dioxides with various morphologies were prepared using a common hydrothermal method without any templates or additives.The evolution of the morphology was accompanied by the gradual conversion of the polymorphic forms from γ-type to β-type.Meanwhile,MnO2 microspheres,urchin-like nanostructures and nanowires were successfully synthesized.The products were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscope and transmission electron microscope.The evolution process can be explained by the Ostwald Ripening mechanism.
查看更多>>摘要：Polypropylene grafting with AA was prepared by reactive extrusion with pre-irradiated PP (rPP) as the homogeneous initiator.The effects of the pre-irradiated dose,the fraction of rPP and the concentration of acrylic acid on the grafting reaction were studied and the grafted PP was characterized by Fourier transition infrared spectroscopy (FTIR),differential scanning calorimeter (DSC)and polarized light microscopy (PLM).The results show that the degradation of PP was suppressed efficiently with this novel method for preparing PP-g-AA copolymers,and the grafted copolymers with good mechanical properties were obtained.It was found that the product with higher graft degree (Gd)(0.19%) and relatively excellent mechanical properties can be produced if the mass ratio of PP/rPP/AA 4 kGy.Moreover,an adhesive strength of 4.88 kN/m was reached in the PP-g-AA/aluminum laminate.
查看更多>>摘要：The interaction between CT-DNA and a ternary copper (Ⅱ) complex,[Cu(phendio)(L-Phe)(H2O)](C1O4)'H2O (CuPP,phendio = 1,10-phenanthroline-5,6dione,L-Phe = L-phenylalanine),has been conducted by electronic spectra,fluorescence spectroscopy and cyclic voltammetry.It has been found that the max.absorption peak from the electronic spectra is red shifted and the intensity is weakened and that the values of peak current from cyclic voltammetry are decreased significantly in the presence of DNA compared with that in the absence of DNA.At the same time,the complex can quench the emission intensity of EB-DNA system.The existence of the intercalation mode between the complex and DNA was proven.By submarine gel electrophoresis,we found that the copper(Ⅱ) complex can cleave circular plasmid pBR322 DNA into nicked and linear forms in the presence of ascorbic acid and H2O2.
查看更多>>摘要：A practical and efficient synthesis of 1,4-dideoxy-1,4-imino-D-arabinol and its partially protected derivatives has been described via the key intermediate with a norbornane-like structure using D-glucose as a starting material.
查看更多>>摘要：The morphology and structure of Pt-CNTs/GC electrodes were characterized via Transmission Electron Microscopy (TEM) and selected area electron diffraction.The electro-oxidation behavior of CO and methanol on Pt-CNTs/GC electrodes were studied with cyclic voltommograms or chronoamperometry.Three oxidation peaks were observed for CO absorbed on PtCNTs/GC electrodes.Methanol was found to be dissociated spontaneously on the electrode to produce a strong absorbed intermediate CO.Among the three oxidation peaks,peak Ⅰ was presumed to be due to the bridged CO absorption while peaks Ⅱ and Ⅲ were attributed to the split in the linear CO which is absorbed on the PtCNTs/GC nanocluster with different particle size and Pt film.The oxidation current of methanol on the Pt-CNTs/GC electrode did not always increase with the increase in the amount of Pt loading,The result indicates that there is an optimal Pt loading for methanol oxidation.It is necesSary to select the catalyst with proper Pt loading when the anode of a direct-methanol fuel cell is prepared.
查看更多>>摘要：A new synthetic method for 5-bromo-3-sec-butyl-6-methyluracil (Bromaeil) using 2-bromobutane and urea as starting materials is described.The synthesis involved condensation,cyclization and bromination with a total yield of 60%.The structure of Bromacil was determined by 1H NMR,13 C NMR and IR spectroscopy.
查看更多>>摘要：Hexagonal close-packed Ni nanoparticles were synthesized using a heat-treating technique with the precursors prepared by the sol-gel method.The synthesis condition,structure,and morphology of the samples were characterized and analysed by thermogravimetric analysis (TG),differential thermal analysis (DTA),X-ray diffraction (XRD) and transmission electron microscopy (TEM).Results indicate that the hexagonal close packed Ni nanoparticles were synthesized at a heat-treating temperature of 300℃.The cell constants are calculated at a=0.2652 nm and c=0.4334 nm.The average grain size of the hexagonal close-packed Ni particles evaluated by Scherrer equation is about 12 nm.The phase transformation from a hexagonal close-packed Ni to a face-centered cubic Ni structure occurred when the heat-treating temperature was increased.
查看更多>>摘要：Pd/Ni bimetallic catalysts were prepared by replacement reactions,characterized by X-ray diffraction,CO chemisorption and H2 temperature-programmed desorption,and evaluated for hydrogenation of cyclohexene,styrene and acetone.The results show that Pd atoms are monolayer-dispersed on the Ni surface in these Pd/Ni catalysts.Consequently,Pd/Ni catalysts are much more active than Pd/Ni and Pd/γ-Al2O3 with the same Pd loading prepared by the conventional impregnation method.
查看更多>>摘要：The hydrophobic formation cationic starch (PSOAMDA) was prepared from starch (St),octadecyl acrylate (OA),acrylamide (AM) and dimethyl diallyl ammonium chloride (DMDAAC) by means of inverse suspension polymerization with redox initiator.Water with algae from Dianchi Lake was tested with PSOAMDA.Results show that when the molar ratio of St:perature is 40℃ with a reaction time of 3 h,the monomer conversion yield,graft percentage and cationic degree is 92.4%,63.8% and 7.3%,respectively,and Mη=3.26 × 106 g/vmol.It had been found from the flocculation of disposed water with algae from Dianchi Lake that the transparency and COD elimination reach to 93.5%and 70.3%,respectively,with 15 mg/L PSOAMDA and at pH 6,vs.91.3% and 69.2% obtained with the commercial cationic polyacrylamide (PAM-C).When PSOAMDA dosage is 10-25 mg/L and the pH of aqueous solution is 6-10,the flocculation performance is well capable of dealing with the water with algae from Dianchi Lake.
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