Surface Enhanced Raman Scattering (SERS) of tetrasodium meso-tetrakis (4-sulfonatophenyl) porphine (H2TSPP) and silver tetraphenylporphyrin (Ag(Ⅱ)TSPP)adsorbed spontarleously on uniform Fe3O4 colloids are recorded. T...Surface Enhanced Raman Scattering (SERS) of tetrasodium meso-tetrakis (4-sulfonatophenyl) porphine (H2TSPP) and silver tetraphenylporphyrin (Ag(Ⅱ)TSPP)adsorbed spontarleously on uniform Fe3O4 colloids are recorded. The enhancement of Raman bands is approximately 30. An analysis of the SERS spectrum shows that on the Fe3O4 surface H2TSPP takes its diacid form H42+TSPP.展开更多
The graft copolymerization of methylacrylate onto gelatin initiated by persulfate urea redox system was studied. The effects of reaction parameters such as copolymerization temperature, copolymerization time, concentr...The graft copolymerization of methylacrylate onto gelatin initiated by persulfate urea redox system was studied. The effects of reaction parameters such as copolymerization temperature, copolymerization time, concentrations of initiator, monomer and gelatin on the grafting percentage( G ), grafting efficiency( E ) and total yield( Y ) were investigated. The molecular weight of PMA branch and its intrinsic viscosity were determined.展开更多
文摘Surface Enhanced Raman Scattering (SERS) of tetrasodium meso-tetrakis (4-sulfonatophenyl) porphine (H2TSPP) and silver tetraphenylporphyrin (Ag(Ⅱ)TSPP)adsorbed spontarleously on uniform Fe3O4 colloids are recorded. The enhancement of Raman bands is approximately 30. An analysis of the SERS spectrum shows that on the Fe3O4 surface H2TSPP takes its diacid form H42+TSPP.
文摘The graft copolymerization of methylacrylate onto gelatin initiated by persulfate urea redox system was studied. The effects of reaction parameters such as copolymerization temperature, copolymerization time, concentrations of initiator, monomer and gelatin on the grafting percentage( G ), grafting efficiency( E ) and total yield( Y ) were investigated. The molecular weight of PMA branch and its intrinsic viscosity were determined.
