Ring-opening metathesis polymerization of norbornene catalyzed by Grubbs catalyst [(PCy3)2·(Cl)2Ru=CHPh] was carried out. The results of 1H NMR demonstrated that the polymerization of the norbornene monomer proce...Ring-opening metathesis polymerization of norbornene catalyzed by Grubbs catalyst [(PCy3)2·(Cl)2Ru=CHPh] was carried out. The results of 1H NMR demonstrated that the polymerization of the norbornene monomer proceeded by the ROMP mechanism. The molecular weight and molecular weight distribution of this reaction can be controlled by changing the stirring time of catalyst, choosing different solvents and the adding of PPh3 during the polymerization. The results show that stirring the catalyst for 15 min, using more polar solvent and adding 2 equiv of PPh3 can optimize the conditions of this reaction. The polydispersity indices(PDIs) of the poly(norbornene) were nearly monodisperse(PDIs about 1.18).展开更多
The feasibility of the mercaptopropyl acid modified CdTe nanoparticles synthesized in aqueous solution to the labeling of biomoleculespapain via electrostatic interaction was studied in this paper. The absorption spec...The feasibility of the mercaptopropyl acid modified CdTe nanoparticles synthesized in aqueous solution to the labeling of biomoleculespapain via electrostatic interaction was studied in this paper. The absorption spectrum of CdTe papain solution became more flat than that of CdTe nanoparticles in the wavelength range from 400 to 600 nm. While the emission peak of CdTe papain solution underwent a red shift, the intrinsic emission band width was unchanged. The TEM images of monodisperse mercaptopropyl acid stabilized CdTe nanoparticles and CdTe papain solution were compared and the effect of pH of buffer solution was studied. It was proved that the red shift of the emission peak was the result of the electrostatic interaction between CdTe nanoparticles and papain.展开更多
Zinc oxide nanostructure thin films were prepared on quartz slides via chemical vapour deposition(CVD). Various nanostructures such as nanorod, nanowires and surface-rough nanocubes, could be obtained under carefully ...Zinc oxide nanostructure thin films were prepared on quartz slides via chemical vapour deposition(CVD). Various nanostructures such as nanorod, nanowires and surface-rough nanocubes, could be obtained under carefully tuning experimental conditions. The surface-enhanced Raman scattering(SERS) character of these films was investigated by using 4-mercaptopyridine(4-MPY) as the probing molecule.展开更多
文摘Ring-opening metathesis polymerization of norbornene catalyzed by Grubbs catalyst [(PCy3)2·(Cl)2Ru=CHPh] was carried out. The results of 1H NMR demonstrated that the polymerization of the norbornene monomer proceeded by the ROMP mechanism. The molecular weight and molecular weight distribution of this reaction can be controlled by changing the stirring time of catalyst, choosing different solvents and the adding of PPh3 during the polymerization. The results show that stirring the catalyst for 15 min, using more polar solvent and adding 2 equiv of PPh3 can optimize the conditions of this reaction. The polydispersity indices(PDIs) of the poly(norbornene) were nearly monodisperse(PDIs about 1.18).
文摘The feasibility of the mercaptopropyl acid modified CdTe nanoparticles synthesized in aqueous solution to the labeling of biomoleculespapain via electrostatic interaction was studied in this paper. The absorption spectrum of CdTe papain solution became more flat than that of CdTe nanoparticles in the wavelength range from 400 to 600 nm. While the emission peak of CdTe papain solution underwent a red shift, the intrinsic emission band width was unchanged. The TEM images of monodisperse mercaptopropyl acid stabilized CdTe nanoparticles and CdTe papain solution were compared and the effect of pH of buffer solution was studied. It was proved that the red shift of the emission peak was the result of the electrostatic interaction between CdTe nanoparticles and papain.
文摘Zinc oxide nanostructure thin films were prepared on quartz slides via chemical vapour deposition(CVD). Various nanostructures such as nanorod, nanowires and surface-rough nanocubes, could be obtained under carefully tuning experimental conditions. The surface-enhanced Raman scattering(SERS) character of these films was investigated by using 4-mercaptopyridine(4-MPY) as the probing molecule.
