Advanced Materials Research Vol. 1089

Abstract: The magnetostriction and magnetic properties of electrical steel are depended on the external stress. In this paper, a noncontact magneostriction measuring system using laser displacement meter with high resolution of 10 nm has been built. The grain-oriented electrical steel with dimensions 500 mm × 100 mm × 0.3 mm was measured between 20 MPa and-20 MPa. The magnetostriction and magnetic properties were highly sensitively to stress. A clear relationship between power loss and magnetostriction under stress was found, and the underlying mechanism has been discussed.

Abstract: A new ternary compound TbCo0.67Ga1.33 was discovered and studied by means of X-ray powder diffraction technique. The crystal structure of the new compound was refined by using Rietveld method from X-ray powder diffraction data. This compound crystallizes in the orthorhombic with the CeCu2 structure type( space group Imma, a = 0.43384(6) nm, b = 0.70193(1) nm, c = 0.75617(1) nm, Z = 4, and Dcalc = 8.512 g/cm3 ). The Rietveld refinement results were Rp = 0.0996, Rwp = 0.1277.

Abstract: Carbon nanotubes have been considered as promising materials for applications of nanodevices. As building blocks, carbon nanotube junctions formed by carbon-carbon covalent bonds are desired nanostructures for carbon nanotube based materials, however the formation of the junctions made of C-C bonds is still quite challenging. In this paper, a molecular dynamics study on the generation of single-walled carbon nanotubes junction by direct C₆₀ bombardment is conducted. Results show that carbon nanotube junctions can be formed by direct C₆₀ bombardment, however the structure of the formed junction is similar as the riveted structure in some case and the C₆₀ bombardment may lead to uncontrollable bonding disorder in the joints.

Abstract: The molecular structures and infrared of four meso-phenyl and 3,5-diaryl substituted BODIPY dyes, A to D, were investigated theoretically using the gradient-corrected density functional theory B3LYP method under 6-31+G* level. The vibrational and transition modes of spectra were explored in terms of their microscopic origin. According to structure analysis, the intersection angles of BODIPY core with meso-phenyl were estimated 59-61º and the angles of BODIPY ring with 3,5-diaryl groups were evaluated 38-62º. The solvation energies of four BODIPYs are −26.26, −30.39, −34.1, −27.58 KJ/mol, respectively.

Abstract: A amphiphilic triblock copolymer, poly(ethylene oxide) -poly(dimethylsiloxane) -poly(ethylene oxide) (PEO-PDMS-PEO) was synthesized via a simple hydrosilylation reaction, and inclusion selective rule of cyclodextrins (α–CDand γ-CD) and PEO-PDMS-PEO to form inclusion complexes were discussed in this paper. Selective inclusion's impact on the triblock copolymer( PEO-PDMS-PEO) was studied.

Abstract: One Bis-Boc-L-alanine-1,8-naphthyridine ligand containing amino acid by amido bond named 2,7-Bis-Boc-L-alanine-1,8-naphthyridine (L1) was synthesized and characterized. And there absorption and fluorescence spectra in methanol is presented. It exhibits electronic absorption spectra with λmax at about 340 nm, which can be tentatively assigned to π→π* transition. The emission spectra of L1 in CH₃OH shows a mirror symmetry peak with λ_max at about 375 nm. Then, the comprehensive study of spectroscopic properties upon titration of L1 with heavy metal ions as ion source in CH₃OH was investigated.

Abstract: This paper studied the adsorption behavior of Cd on manganese dioxide, focusing on the factors of affecting the adsorption. The results showed that the adsorption equilibrium was reached in about six hours. The amount of manganese dioxide adsorption of cadmium ions increased with the increasing of the initial Cd²⁺ concentration, and then decreased, adsorption isotherms accorded with Langmuir isotherm equation. The most influence factor on the adsorption properties of manganese dioxide was pH value. After the addition of inorganic salts, only ammonium bicarbonate could promote the adsorption of cadmium, other inorganic salts inhibited the adsorption of cadmium.

Abstract: PbS quantum dots/ Boron and Nitrogen co-doped TiO₂ photocatalyst emulsions were synthesized by a complexation-controlled hydrolysis method at room temperature. Boron compounds and Nitrogen compounds were added to TiO₂ precursor solution, and PbS quantum dots were attached to TiO₂ particles surfaces by using chemical reaction. The hybird composite photocatalysts were characterized by nanoparticle size analyzer. Their photocatalytic properties were evaluated through the degradation of acid red 3R dye. The results indicate that when TiO₂ emulsion added to Boron ions, Nitrogen ions, and PbS quantum dots, the reflux time is 15 min, the photocatalytic performance of the emulsion is the best.

Abstract: The manganese oxide (MnO₂) sample was synthesized by the reaction of KMnO₄ with Mn (Ac)₂ using the HNO₃ solution as pH regulator. The Ag-doped manganese oxide, Ag/MnO₂-Q and Ag/MnO₂-H, were synthesized by incorporation method and typical wet impregnation method, respectively. The structure of catalysts was characterized by N₂ adsorption/desorption and X-ray diffraction. The influences of preparation methods on the catalytic activity of CO oxidation were studied. The doping of Ag to MnO₂ decreased the specific surface area of Ag/MnO₂ catalysts, especially for Ag/MnO₂-H samples prepared by traditional wet-impregnation method. The Ag/MnO₂ catalysts showed higher catalytic activity for CO oxidation than that of MnO₂. The catalytic activities of Ag/MnO₂ samples strongly depended upon the preparing methods, among which 3Ag/MnO₂-Q catalyst, prepared by the incorporation method, was the most efficient catalyst towards the addressed reactions. The excellent performance of 3Ag/MnO₂-Q was mainly associated with the good low-temperature reducibility, abundant surface oxygen and broadly dispersed silver oxides species.

Abstract: In this study, it was aimed at preparing and characterizating of poly (methyl methacrylate) (PMMA) shell microcapsules containing tetradecanol as phase change materials (PCMs) for thermal energy storage. The tetradecanol microcapsules were characterized by using scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The test result show that the contents of tetradecanol in microcapsules nearly 57.5% and the latent heats of melting and freezing were found to be 120.7 and 118.4 J/g. TGA analyses also indicated that the microPCMs degraded in two steps and have good thermal stability.