Advanced Materials Research Vols. 1033-1034

Abstract: Chemical engineering calculation is the base of chemical engineering science, the material balance and the energy balance are the most basic and important contents in chemical engineering calculation. The diversification and the importance of calculating benchmark in chemical engineering calculation were explained by an example about the material balance; the basic principles, some specific methods and skills for the calculating benchmark selection were pointed out. In short, the proper selection of calculating benchmark in chemical engineering calculation can not only simplify the calculation and improve the efficiency, but also avoid the errors.

Abstract: A quasiclassical trajectory calculation is carried out to investigate the effect of reagent rotational excitation on product rotational polarization in the reactions Li + TF(v=0, j=0-5) → LiF + T. It is found that the reagent rotational excitation slightly effect the product rotational alignment. However, the product rotational orientation becomes stronger and stronger with the increase of the reagent rotational quantum number from j=0 to j=5. The reaction mechanism for the title reactions changes from direct for j=0-1 to indirect for j=2-5.

Abstract: Process mineralogy research of a mixed copper ore is studied to identify the occurrence mode of copper and to analyze the mineralogical factors influencing the floatation results. The results show that the ore has features of "high-sulfur, high copper", "various copper mineral types", "fine copper mineral granularity" "disorderly copper mineral distribution", which belongs to the more difficult processing high sulfur mixed copper ore. Therefore, in order to effectively utilize the copper mine resource, floatation process or combination of floatation-hydrometallurgy process should be adopt.

Abstract: The impact performance play an important role to marine material. A numerical methodology including user material subroutine VUMAT, Johnson–Cook flow stress model and surface-based cohesive behaviour is employed to simulate the damage of the impact of GLARE 5 fibre-metal laminates (FML). Not only histories of absorbed energy, deflection, contact force are presented in our simulation, but the interface delamination is also investigated. After parameter study, suitable fracture energy in surface-based cohesive behaviour was found.

Abstract: This paper determined the total absorbance of phosphorus molybdenum blue and arsenic molybdenum blue by using the additive property of their absorbance values. By eliminating the interference of arsenic by reduction masking with composite reducing agent Na₂SO₃-Na₂S₂O₃-KBr, the absorbance of phosphorus could be obtained. Thus, the content of phosphorus and arsenic could be calculated, respectively. The results show that the work curves of this method for phosphorus and arsenic are consistent with Beer’s law when the content of phosphorus and arsenic is 0-0.60ug/mL and 0-2.00ug/mL, respectively. The standard addition recovery rate of phosphorus and arsenic is 98.80%-101.04% and 99.00%-101.50%, respectively. The relative standard deviation of phosphorus and arsenic is less than 4.0% with good accuracy and precision. This method is simple and fast to determine phosphorus and arsenic in molybdenum concentrate, and the results are accurate and reliable.

Abstract: The key intermediate of strictifolione was synthesized via an Evans aldol reaction to construct its chiral hydroxyl.

Abstract: A method was developed for determination of Ethinylestradiol, Diethylstilbestrol, 4-Nonylphenol and Estradiol benzoate residue in fish samples using solid phase extraction and high performance liquid chromatography. Samples were extracted and filtered for HPLC analysis. The analysis was used gradient elution with acetonitrile-water as the mobile phase. Under the optimized conditions, a method with good reproducibility (1.16%~2.45%) and the recovery (80.0%~92.5%) was developed for target components in spiked fish samples. The calibration curves were linear with correlation coefficient ranged from 0.9970 to 0.9983. The detection limit of the method was ranged from 0.0606 to 0.6066μg/ml.This method was rapid, sensitive and nothing interfered determination of the 4 kind of components.

Abstract: A method has been developed for the detection of cyromazine and melamine using capillary electrophoresis (CE) coupled with electrogenerated chemiluminescence (ECL). The method utilized gold nanoparticles modified electrode as a working electrode because it can improve sensitivity of ECL detection. It has been found that acetonitrile can improve stacking in electrokinetic injection with field amplified sample stacking. The detection limits of 0.5 ng/mL and 1.0 ng/mL were obtained for cyromazine and melamine, respectively. The established method was successfully applied for milk sample analysis with good reproducibility, precision, accuracy, and high recovery.

Abstract: A convenient route, based on electrospinning technique is designed for the preparation of silver/polyacrylonitrile (Ag/PAN) composite nanofibers. Scanning electron microscopy (SEM) gave direct evidence that Ag nanoparticles (AgNPs) with uniform size were well dispersed on the surface of the PAN nanofibers. Ag/PAN nanofibers were used without any oxidation pretreatment for the electrochemical detection of bisphenol-A (BPA) with a low detection limit (0.1 μM). In addition, the Ag/PAN nanofibers offer a fast response and wide detection range (0.1 - 12.0 μM) for BPA quantification. Meanwhile, the proposed electrochemical method based on Ag/PAN nanofibers showed excellent reproducibility. The attractive electrochemical performance and the simple preparation process of the Ag/PAN made it has a promising applications for the detection of BPA in real samples.

Abstract: An effective hydroalkoxylation/cyclization of alkynyl alcohol catalyzed by In (OTf)₃ was reported, which could be used to the synthesis of oxygen-containing heterocycles.