查看更多>>摘要：The concentration of reserpine in urine was directly and quantitatively measured by using the excitation-emission fluorescence (EEM) combined with threeway calibration methodologies.Two calibration methods are based on the alternating trilinear decomposition (ATLD) and the self-weighted alternating trilinear decomposition (SWATLD) algorithms,respectively.These chemometric methodologies have the second-order advantage,which is the ability to get accurate concentration estimates of interested analyte(s) even in the presence of uncalibrated interferences.The satisfactory results on spiked urine samples are obtained,when the component number was chosen to 3 (N=3) for both the methods.This experiment is easily carried out without time-consuming and complicated pretreatment.It has proved that the three-way calibration methodologies based on ATLD and SWATLD can be feasible to directly quantify the medical content of reserpine in urine.
查看更多>>摘要：The ZnO films with two-dimensional ordered macroporous structure were successfully fabricated through hydrothermal crystal growth of ZnO on the ZnO substrate covered with a mouolayer of polystyrene (PS) spheres as template.The precursor solution of hydrothermal crystal growth of ZnO were prepared by equitramine (HMT).The confinement effect of the PS spheres template on the growth of ZnO nanorods and the influence of sodium citrate on the crystal growth of ZnO had been studied.The film surface morphology and the preferential growth of ZnO crystal were investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD),respectively.Also,the photoluminescence spectrum of ZnO films had been measured,and the corresponding mechanism was discussed.
查看更多>>摘要：A novel epoxidized soybean oil (ESO) internally toughened phenolic resin(ESO-IT-PR) with both good toughness and excellent thermal stability was prepared as the matrix resin of copper clad laminate (CCL).FTIR was adopted to investigate the molecular structure of modified phenolic resins and SEM was used to observe the micro morphology of their impacted intersections.The properties of CCLs prepared with these modified phenolic resins were studied to determine the optimal process and investigate the toughening mechanism.The main modifying mechanism is the etherification reaction between phenol hydroxyl and ESO catalyzed by triethanolamine and the chain extension polymerization between ESO and multi-amine gives the long-chain ESO epoxy grafting on the phenolic resin prepolymer,when the ESO content is 30% and the curing agent content is 7%,the ESO toughened phenolic resin possesses optimal performance.The flexible ESO epoxy shows significant toughening effect and it crosslinks with the phenolic resin to form an internally toughened network,which is the key factor for improving the solderleaching resistance of CCL prepared with this modified phenolic resin.
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