Advanced Materials Research Vol. 643

Abstract: Phosphate is widely used in frozen aquatic products. In this study, frozen Pollock was taken as raw materials, and the effect of different phosphates (sodium pyrophosphate, sodium tripolyphosphate and sodium hexametaphosphate) on weight gain, thawing loss and cooking yield of Pollock fillets were studied. The results showed that with the increasing concentration, the weight gain and cooking yield of sodium pyrophosphate and sodium tripolyphosphate treatment groups increased, and the thawing loss reduced, whereas sodium hexametaphosphate treatment group remained unchangeable. The optimal proportion of sodium pyrophosphate, sodium tripolyphosphate and sodium hexametaphosphate on Pollock fillets was 3:2:3 and the concentration of mixed phosphates was 4%, and the weight gain, cooking yield and thawing loss was 17.1%, 88.6% and 2.7%, respectively

Abstract: paecilodepsipeptide A was first synthesized by retrosynthesis methods. the structures were determined by Mass Spectrometry and NMR spectroscopy, and the anti-tumor activities on human hepatocellular carcinoma cell line (SMMC-7721) and human lymphoma cell line (Raji) were examined by MTT. The result showed that the rate of Paecilodepsipeptide A was 72% by retrosynthesis methods. The structures of the synthesized product were identified by 1H NMR and 13C NMR spectra, which is identical to the natural product. The product has remarkable anti-proliferation activity on SMMC-7721 and Raji, which showed good anti-tumor activity. IC50 was 8.97 μmol/L and 11.13 μmol/L respectively, The total synthesis of Paecilodepsipeptide A is significant to further study its derivatives and develop novel antitumor drugs.

Abstract: LiFePO₄/C composite cathode materials were synthesized by spray-drying method using LiH₂PO₄ and Fe₂O₃ as raw materials and amylum as conductive additive and reducing agent. The microstructure of the samples was characterized by X-ray diffraction; charge/discharge cycling performance and electrochemical impedance spectroscopy (EIS) were used to characterize their electrochemical properties. X-ray diffraction result showed that LiFePO₄/C composite has an order olivine structure with space group of Pnma. The charge/discharge tests showed that the cathode material has a high discharge capacity of 140.8mAh/g after 5 cycles at 0.1C rate. And after 100 cycles at 1C rate, the discharge capacity is 108.4mAh/g.

Abstract: The effect of pH concentrations on the size and morphology of FePO₄•xH₂O particles synthesized in a hydrothermal reactor was investigated in this work. FePO₄•xH₂O was prepared through co-precipitation by employing Fe(NO₃)₃•9H₂Oand H₃PO₄ as raw materials. The LiFePO₄ obtained through lithiation of FePO₄•xH₂O by using glucose as a reducing agent at 700°C. The electrochemical performance of LiFePO₄ powder synthesized at 700°C were evaluated using coin cells by galvanostatic charge/discharge .The results indicated that the synthesized LiFePO₄/C composites (pH=2) showed a superior electrochemical capacity of 146 mAh/g and possessed a capacity favorable cycling maintenance at the 0.1C rate and high electronic conductivity.

Abstract: The thermodynamic analysis of Ni²⁺-Mn²⁺-NH₃-OH^--H₂O in co-precipitation system was carried out, and the precursor Ni_1/2Mn_1/2(OH)₂ was prepared by hydroxide co-precipitation method. The analysis showed that the best pH value of mixed solution is 11 and the ammonia concentration is 0.4 mol/L, when NaOH is precipitating agent and ammonia is chelating agent. When the pH value is 11, the SEM images confirm that the morphology of Ni_1/2Mn_1/2(OH)₂ is the best.

Abstract: The effects of polysaccharides extracted from persimmon (Diospyros kaki) fruits (PFP) and its sulfated derivates (PFP-S) on activity of mouse peritoneal macrophages (PM) were evaluated by measuring their effects on the viability, nitric oxide (NO) production, cytokine (TNF-α, IL-10 and IL-2) production and gene expression. The results showed that both PFP and PFP-S significantly increased the viability and the productions of NO, TNF-α and IL-10 with the increase of the substitution degree (DS) and dose. Of the fractions, PFP-SIII (DS 2.5, Mw 48kDa) was the most potent inducer of NO and cytokine production, increasing production of NO and expression of cytokines (IL-10 and TNF-α). It was supposed from this result that PFP-S might act as an inducer of macrophage functions against pathogens, which might be affected by the sulfate content of polysaccharides made great role in regulate of immunomodulatory activities.

Abstract: Molecular dynamics simulation has been performed to explore the thermodynamics and dynamics properties of liquid Cu-Ni alloy based upon developed embedded atom methods (EAM), namely due to G. Bonny. The calculated liquid density shows that the potential underestimates the measured atomic density for Ni-rich composition. The calculated mixing enthalpy predicts the potential underestimates the mixing enthalpy when the concentration of Ni is increased beyond roughly 30 at. %. We make a conclusion from the fact that the G. Bonny’s model is not full perfect in describing the density and mixing enthalpy of Cu-Ni melts at the Ni-rich composition.

Abstract: This paper aims to develop in the semiconductor plant molecular filtration efficiency with properties of semiconductor materials in the real-time. The goal of the assessment is to propose a new device based on the technologies assessed. First, the Scanning Mobility Particle Sizer Spectrometer with CPC (SMPS+C), a description of how each counter works is given. Second, a new experiment method for HEPA/ULPA filter efficiency certification in the real-time in semiconductor industry is developed. The experimental results showed that the performance of capillary had been installed and cleaned. The SMPS mean diameter fell within the range of the NIST standard. And, the HEPA/ULPA filter efficiency certification is explored. The best filtration efficiency particles size is 0.16μm. The results of this research provide the engineers with very useful information in semiconductor industry.

Abstract: In this paper, the morphology change of various polymers at the mica –water interface, such as polyvinylpyrrolidone (PVP), polystryrenesulfonate (PSS), and partially hydrated polyacrylamide (HPAM) in different environments was investigated by atomic force microscopy (AFM). We found that PVP molecules deposited on mica from aqueous solution appeared in stretched wormlike coils forming densely packed films. In NaCl solution, the globular molecular conformation was observed. For PSS molecules the similar results were obtained. HPAM molecules deposited on the mica surface from aqueous solution at natural pH were observed to form a nanostructured network

Abstract: The anatase nano-TiO2 was modified by metal ion-doping to improve its photocatalystic activity. Then the modified nano-TiO2 was used in coating as a formaldehyde degradation material and antibacterial materials. The test results showed that modified nano-TiO2 photocatalytic properties was significantly improved whose formaldehyde degradation rate reached 85% and bacteriostatic rate was more than 99%. Then the photocatalytic theory and the antibacterial theory of modified nano - TiO2 were analyzed.