In this paper a quick method was developed to determine separate furfural and HMF concentrations simultaneously in ethanol-water hydrolysate of reed based on UV spectroscopy.Acid soluble lignin and other interfering s...In this paper a quick method was developed to determine separate furfural and HMF concentrations simultaneously in ethanol-water hydrolysate of reed based on UV spectroscopy.Acid soluble lignin and other interfering substances were first removed by distillation as residue.The distillate was then used for the determination of furfural and HMF by measuring the maximum absorption wavelength and the absorbance at the wavelength.Results showed that the maximum absorption wavelength of the characteristic peak correlated well with the composition of furfural and HMF mixture in an ethanol-water solution,and the absorbance at the maximum absorption wavelength also had an excellent linear relationship with the sum concentration of furfural and HMF in the solution.The separate concentrations of furfural and HMF in a mixture solution could be determined by applying these correlations.展开更多
A self-organized thin film of a cyanine dye is fabricated by the spin-coating technique and is characterized by ultraviolet-visible spectroscopy, infrared （IR） spectroscopy, small-angle X-ray diffraction, eUipsomete...A self-organized thin film of a cyanine dye is fabricated by the spin-coating technique and is characterized by ultraviolet-visible spectroscopy, infrared （IR） spectroscopy, small-angle X-ray diffraction, eUipsometer, and atomic force microscopy （AFM）. The nonlinear optical properties of the thin films are investigated by degenerate four wave mixing （DFWM） technique. The cyanine dye thin film sample exhibits high optical nonlinearities （χ^（3） = 2.55 × 10^-12 esu）, and the mechanism is analyzed by the exciton coupling theory.展开更多
基金National Natural Science Foundation of China for financial support for this research (Grant#:31270634).
文摘In this paper a quick method was developed to determine separate furfural and HMF concentrations simultaneously in ethanol-water hydrolysate of reed based on UV spectroscopy.Acid soluble lignin and other interfering substances were first removed by distillation as residue.The distillate was then used for the determination of furfural and HMF by measuring the maximum absorption wavelength and the absorbance at the wavelength.Results showed that the maximum absorption wavelength of the characteristic peak correlated well with the composition of furfural and HMF mixture in an ethanol-water solution,and the absorbance at the maximum absorption wavelength also had an excellent linear relationship with the sum concentration of furfural and HMF in the solution.The separate concentrations of furfural and HMF in a mixture solution could be determined by applying these correlations.
基金This work was supported by the National Natural Science Foundation of China(No.10574046)the National Key Project for Basic Research of China(No.2006CB806006 and 2006CB921105)+4 种基金the Program for Changjiang Scholars and Innovative Research Team in University(PCSIRT)the Program for New Century Excellent Talents in University(NCET-04-0420)the Doctoral Program of High Education(No.20050269011)the Phosphor Program sponsored by Shanghai Science Technology Committee(No. 06QH14003)the Twilight Project sponsored by Shanghai Education Committee(No.03SG23).
文摘A self-organized thin film of a cyanine dye is fabricated by the spin-coating technique and is characterized by ultraviolet-visible spectroscopy, infrared （IR） spectroscopy, small-angle X-ray diffraction, eUipsometer, and atomic force microscopy （AFM）. The nonlinear optical properties of the thin films are investigated by degenerate four wave mixing （DFWM） technique. The cyanine dye thin film sample exhibits high optical nonlinearities （χ^（3） = 2.55 × 10^-12 esu）, and the mechanism is analyzed by the exciton coupling theory.
