Advanced Materials Research Vol. 749

Abstract: In HCl solution, the Se (IV) was reduced to SeH₂ by NaBH₄, and absorbed by solution of ethanol-AgNO₃. The Ag⁺ was reduced to nanosilver that exhibited surface plasmon resonance absorption (SPR) peaks at 292 nm and 420 nm. Under the selected conditions, the value at 292 nm was linear to the concentration of Se (IV) in the range of 0.08-2.0 μg/mL, a detection limit of 0.04 μg/mL. The proposed method was applied to detect Se (IV) in water samples, with satisfactory results.

Abstract: In H₂SO₄ solution, the arsenic was reduced to arsine (AsH₃) by NaBH₄, and absorbed by solution of H₃PO₄-HAuCl₄-NH₄SCN-gum arabic. The Au³⁺ was reduced to nanogold, which led to the absorption value at 555nm increased. Under the selected conditions, the value was linear to the concentration of As (III) in the range of 0.07-1.10 μg/mL, a detection limit of 0.03 μg/mL. The proposed method was applied to detect As (III) in water samples, with satisfactory results.

Abstract: In the presence of stabilizer of citrate and 10 nm gold nanoparticles (AuNPs) at 90 °C temperature, stable Au_coreAg_shell nanosol was prepared by reduction of AgNO₃ by citrate. It was characterized by UV-visible spectroscopy, resonance Rayleigh scattering (RRS) spectroscopy, and transmission electron microscopy. Results showed that the nanosol exhibited a RRS and surface Plasmon resonance (SPR) effect and the particle size is 20 nm.

Abstract: In the presence of stabilizer of citrate and room temperature, stable green nanosilver sol was prepared by reduction of AgNO₃ by ascorbic acid. It was characterized by UV-visible spectroscopy, resonance Rayleigh scattering (RRS) spectroscopy, laser scattering and transmission electron microscopy. Results showed that the nanosilver sol exhibited a RRS peak at 496 nm, a strong absorption peak at 414 nm and the particle size is 12 nm.

Abstract: Two novel dodecyliminodiacetate nickel (II) and copper (II) complexes were synthesized and characterized, and these complexes were used as mimic hydrolytic in catalytic hydrolysis of bis (p-nitrophenyl) phosphate (BNPP). The analysis of specific absorption spectra of the hydrolytic reaction systems indicated that the catalytic hydrolysis involved the key intermediates formed by BNPP with nickel (II) complexes. The kinetic parameter of BNPP catalytic hydrolysis has been calculated and the temperature effect of reaction system and structure effect of the complexes on the rate of BNPP hydrolysis catalyzed by the complexes have been discussed.

Abstract: The cobalt^II complex [Co (C₉H₉O₃)₂(H₂O)₂], Diaqua-bis (ethylvanillinato-O,O')-cobalt^II, the Co^II atom is located on a twofold axis and is coordinated by two ethylvanillinate anions and two water molecule in a distorted octahedral geometry . The ethylvanillinate ligand chelates to the Co^II atom through its ethyl and hydroxy O atoms,with differing Co-O bond distances (2.282(2) Å and 1.9914(18) Å).Adjacent complex link to each other via hydrogen bonds forming the three-dimensional supramolecular structure.

Abstract: A new series complexes of Ln nitrate with H₂L, where Ln stands for La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and H₂L is 2-carboxybenzaldehyde- (4-hydroxy) benzoylhydrazone, were synthesized. Elemental analysis and IR spectroscopy were used to characterize and found that the complexes were Ln (HL)₂(NO₃)·4EtOH·4H₂O type. The binding mode of complexes with CTDNA was investigated by UV-Vis titration and emission titration, suggesting that the complexes bind with CTDNA in a non-covalent groove binding mode.

Abstract: The 2-carboxybenzaldehyde-1H-benzotriazol-1-aceylhydrazone (C₁₆H₁₃N₅O₃) has been synthesized and used in preparing thirteen novel rare earth complexes. The complexes were characterized by elemental analysis, FT-IR, and UV-Vis, and the formula is RE (C₁₆H₁₁N₅O₃)·NO₃·xH₂O·yC₂H₅OH (RE=La, Ce, Pr, Nd, Sm, Eu, Tb, Ho, Er, Yb) and RE(C₁₆H₁₂N₅O₃)₂·NO₃·5H₂O (RE=Gd, Dy, Y) .The thermal decomposition processes of the thirteen complexes were studied by thermal gravimetric technology and their apparent activation energy values were calculated by Kissingers and Ozawass method.

Abstract: With the asymmetric Schiff-base zinc complex ZnL (H₂L = N-(5-bromo-3-methoxysalicylidene)-N'-(5-(4-cyanophenyl)-3-methoxysalicylidene) phenylene-1,2-diamine) as the precursor, a series of heterobinuclear Zn-Ln complexes [ZnLnL(NO₃)₃(CH₃CN)] (Ln = Nd, 1; Ln = Yb, 2; Ln = Er, 3; Ln = Gd, 4) are synthesized by the further reaction with Ln (NO₃)₃·6H₂O, and characterized by FT-IR, FAB-MS and elementary analysis. Photophysical studies of these complexes show that the strong and characteristic NIR luminescence of Nd³⁺, Yb³⁺and Er³⁺ with emissive lifetimes in the microsecond range has been sensitized from the excited state of the asymmetric Schiff-base ligand due to effective intramolecular energy transfer.

Abstract: This paper shows the numerical simulation of the problem that electrical submersible pump impeller is vulnerable to particle impact erosion in the water under the condition of the water injection of the same wells in oil field. This simulation is based on Fluent of CFD software, which has built a geometric model of electric submersible pump impeller flow field, and given the calculation of the internal flow field of the impeller, and showed the solution of the motion track of the particles in the turbulent by the way of discrete phase model and random orbit, and calculated the erosion by the micro cutting model by particless, and compared the field test data with the simulation results which proved the reliability of numerical simulation method.