Nucleation and Growth of Bismuth Electrodeposition from Alkaline Electrolyte

Zhou, Longping,Dai, Yatang,Zhang, Huan,Jia, Yurong,Zhang, Jie,Li, Changxiong Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5

The early stages of bismuth (Bi) electrodeposition on glass carbon electrode from alkaline electrolyte were studied by cyclic voltammetry, chronoamperometry, scanning electron microscopy, atomic force microscopy and X-ray diffraction. The CV analysis showed that the electrodeposition of Bi was determined to be quasireversible process with diffusion controlled. The current transients for Bi electrodeposition were analyzed according to the Scharifker-Hills model and the Heerman-Tarallo model. It can be concluded that the nucleation and growth mechanism was carried out under a 3D instantaneous nucleation, which was confirmed by SEM analysis. The kinetic growth parameters were obtained through a nonlinear fitting. In addition, the Bi film obtaining at -0.86 V for 1 hour was of compact and uniform surface with good smoothness, small roughness and a very high purity. The Bi film were indexed to rhombohedral crystal structure with preferred orientation of (0 1 2) planes to growth.

Effects of Gal-13 on the Content of Immunoglobulin, Proliferation of Lymphocyte and Antibody Titers after Vaccination with Infectious Bursal Disease Virus Vaccine in Chickens

Yang, Yurong,Jiang, Yibao,She, Ruiping,Peng, Kaisong,Zhou, Xuemei,Yin, Qingqiang,Wang, Decheng,Liu, Tianlong,Bao, Huihui Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.3

Gal-13 is an antimicrobial peptide isolated from chicken intestine. Ninety chickens were randomly divided into two groups (45 chickens for each group) to determine the effect of oral administration of Gal-13 on the acquired immune response. The chickens in the first group were fed a diet without Gal-13 as the control, and the chickens in the second group were fed the same diet, except that Gal-13 ($1{\mu}g/ml$) was suspended in drinking water just after hatching. Samples of blood, thymus, bursa of fabricius and spleen were taken at day 1, 4, 7, 10 and 17. The chickens in both groups received infectious bursal disease virus vaccine at day 20, and then sera samples were collected for analysis at 14, 21, 28 and 35 days after vaccination. The results showed: (1) Gal-13 could enhance the content of immunoglobulin (Ig)G at the age of 4 to10 days (p<0.05) and IgM at the age of 4 and 10 days (p<0.05) in the serum; (2) In vitro experiments showed that Gal-13 (0.625-1.250${\mu}g/ml$) enhanced the proliferation of peripheral blood lymphocytes of the chickens stimulated by lipopolysaccharide (LPS) and concanavlin A (ConA). Compared to the control, Gal-13 (1 ${\mu}g/ml$) enhanced the proliferation of bursa lymphocytes at 17 days of age (p<0.01) and thymus lymphocytes at 7 days of age (p<0.01), but restrained lymphocyte proliferation in chicken spleen and differed significantly at day 10 (p<0.01); (3) Gal-13 enhanced infectious bursal disease virus antibody in sera of chickens 21 days after infectious bursal disease virus vaccine administration (p<0.05). These results suggested that Gal-13 could modulate adaptive immune responses of chickens.

Nucleation and Growth of Bismuth Electrodeposition from Alkaline Electrolyte

Longping Zhou,Yatang Dai,Huan Zhang,Yurong Jia,Jie Zhang,Changxiong Li 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5

The early stages of bismuth (Bi) electrodeposition on glass carbon electrode from alkaline electrolyte were studied by cyclic voltammetry, chronoamperometry, scanning electron microscopy, atomic force microscopy and X-ray diffraction. The CV analysis showed that the electrodeposition of Bi was determined to be quasireversible process with diffusion controlled. The current transients for Bi electrodeposition were analyzed according to the Scharifker-Hills model and the Heerman-Tarallo model. It can be concluded that the nucleation and growth mechanism was carried out under a 3D instantaneous nucleation, which was confirmed by SEM analysis. The kinetic growth parameters were obtained through a nonlinear fitting. In addition, the Bi film obtaining at −0.86 V for 1 hour was of compact and uniform surface with good smoothness, small roughness and a very high purity. The Bi film were indexed to rhombohedral crystal structure with preferred orientation of (0 1 2) planes to growth.

Effect of Laser Power on Anisotropic Microstructure and Mechanical Behavior of Biomedical Ti-35Nb-15Zr (at%) Alloy Fabricated by Laser Powder Bed Fusion

Jun Zhou,Yurong Wang,Geng Zhi,Lugui He 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.1

In this study, the anisotropy of Ti-35Nb-15Zr (at%) fabricated in situ using laser powder bed fusion (LPBF) was investigated for the first time. The effects of varying laser powers on the anisotropic microstructure and mechanical properties were investigated. The equiaxed grains growing in the horizontal section were finer than the β-columnar grains growing in the vertical section, and the grain size increased from 8.8 to 10.47 μm as the laser power increased. The difference in microstructure generally resulted in higher nanohardness in the horizontal Sect. (7.12, 6.70, and 6.49 GPa at 250, 275, and 300 W laser power, respectively) than in the vertical Sect. (5.41, 5.56, and 5.38 GPa at 250, 275, and 300 W laser power, respectively). The yield strength (1223.48 ± 27.67 MPa) and ductility (6.77 ± 0.48%) of the samples were both higher in the horizontal direction. The Young’s modulus of the samples in the horizontal direction, which reached as low as 72.82 ± 0.77 GPa, were lower than those in the vertical section, with a minimum of 77.59 ± 1.89 GPa. With increasing laser power, the yield strength in the horizontal direction, Young’s modulus, and yield strength in the vertical direction increased, whereas the yield strength in the vertical direction decreased. In particular, the Ti-35Nb-15Zr alloy exhibited better cellular activity than cast Ti6Al4V. All samples formed dense, bone-like apatite layers on the surface in different directions, demonstrating the great potential of the LPBF Ti-35Nb-15Zr alloy as an implant.

Solution-based synthesis of PEDOT:PSS films with electrical conductivity over 6300 S/cm

Yanbin Shi,Yuqin Zhou,Rongzong Shen,Fengzhen Liu,Yurong Zhou 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-

Poly(3,4-ethylenedioxythiophene) mixed with poly (styrenesulfonate) (PEDOT:PSS) is considered as oneof the most valuable conductive polymers due to its high conductivity, transparency and mechanicalflexibility. Many experiments have proved that H2SO4 post-treatment is an effective way to enhance theelectrical conductivity of PEDOT:PSSfilms. Here we reported a method for the fabrication of PEDOT:PSSfilms with conductivity as high as 6323.9 364.5 S/cm, based on a two-step H2SO4 post-treatment. Thisvery high conductivity is, as far as we know, the highest reported value for PEDOT:PSSfilms by solutionpreparation. The removal of PSS and redox reaction are the keys to enhance the conductivity of PEDOT:PSSfilms.

Kaempferol attenuates spinal cord injury by interfering inflammatory and oxidative stress by targeting the p53 protein: a molecular docking analysis

Chen Lu,Cao Kai,Gu Yurong,Luo Chao,Mao Wei,Zhou Weijun,Zhu Jinwei,Zhang Huying 대한독성 유전단백체 학회 2021 Molecular & cellular toxicology Vol.17 No.3

Background Kaempferol (KMF) is a fl avone reported to have anti-oxidant and anti-infl ammatory activity. Objective The present study screened the eff ect of KMF in the animal model of spinal cord injury (SCI). Results KMF caused a signifi cant inhibition of spinal cord injury mediated oxidative stress and also suppressed the infl ammatory reactions. The treatment of KMF also inhibited the levels of p53, TGF-β1 and COX-2 whereas a signifi cant elevation in Bcl-2/Bax ratio was observed after the rats were treated with KMF. The in silico docking analysis suggested potential binding of KMF having lower energy with p53 confi rming the potential target of KMF. Conclusion The treatment of KMF exerted neuroprotective eff ect by improving the anti-oxidant status and infl ammatory response. The signifi cant spinal cord injury protective eff ect of KMF in rats was attributed by targeting p53 and Bcl-2/Bax ratio.