用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密...用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密的氧化铝膜,产物经充分分散后在有机介质中或水中的稳定时间分别由改性前的2 m in和5 m in提高到2 h和1 d,紫外线透过率由改性前的大于8.5%降低到小于7%。展开更多
In this paper, a kind of novel water-soluble chitosan-polydopamine （CHT-PDA） nanoparticles with a hydrody- namic diameter （Dh） around 10 nm were reported by the combination of self-polymerization of PDA and electr...In this paper, a kind of novel water-soluble chitosan-polydopamine （CHT-PDA） nanoparticles with a hydrody- namic diameter （Dh） around 10 nm were reported by the combination of self-polymerization of PDA and electro- static complexation between PDA and CHT in water/DMSO （W/D） mixture at the molar fraction of DMSO （XDMSO =0.37）. The preparation method was efficient with a yield of 98% around. The as-prepared water-soluble CHT-PDA nanoparticles exhibited effective UV-screen ability, enhanced visible-light transmittance and good cyto- compatibility via MTT assay, which might be used in transparent formulation for UV protection usage, especially in biological field including sun care application.展开更多
目的:设计一种应用于角膜胶原交联术的紫外LED照射仪,可进行光强均匀的照射,以满足角膜胶原术的需求。方法:以资源丰富的C8051F410单片机作为控制系统核心,采用触摸屏作为人机交互界面,并通过精密电阻对工作电流进行采样,以实时监控紫外...目的:设计一种应用于角膜胶原交联术的紫外LED照射仪,可进行光强均匀的照射,以满足角膜胶原术的需求。方法:以资源丰富的C8051F410单片机作为控制系统核心,采用触摸屏作为人机交互界面,并通过精密电阻对工作电流进行采样,以实时监控紫外LED的工作状态;通过使用光学设计软件ZEMAX设计和优化的非球面镜匀光系统,实现紫外LED均匀照明。结果:在距离透镜45 mm、直径约为12 mm的范围内实现了均匀光强分布。最大辐照度为90.223 5 m W/cm2,探测器光通量为247.3 m W,光源能量利用率为60%。结论:该紫外LED照射仪在均匀度和辐照度方面均达到了角膜胶原交联术的需求,并在医院眼科中心通过对小白兔眼睛的照射实验已经验证了照射仪的性能,可以满足角膜胶原交联术的需求。展开更多
In this work,a sky-blue luminescent down-shifting(LDS)layer bis[(4,6-difluorophenyl)-pyridinato-N,C^(2')]c(picolinate)iridium(II)(FIrpic)was inserted between tetraphenyl dibenzoperiflanthene(DBP)and Mo0_(3)as UV-s...In this work,a sky-blue luminescent down-shifting(LDS)layer bis[(4,6-difluorophenyl)-pyridinato-N,C^(2')]c(picolinate)iridium(II)(FIrpic)was inserted between tetraphenyl dibenzoperiflanthene(DBP)and Mo0_(3)as UV-screen and sensitizer for smallmolecule DBP/C_(60)based planar heterojunction(PHJ)solar cells.With 8-nm Flrpic theshort circuit current(J_(sc))and power conversion efficiency(PCE)of the device areenhanced by 28%and 15%,respectively,probably originating from the re-absorption ofthe photons emitted from Flrpic.The V_(oc)linearly increases over 1-nm Flrpic,ascribed tothe deeper HOMO level of Flrpic than DBP,while the fill factor continuously declines from 3-to 10-nm Flrpic.The EQE spectra prove that the J_(sc)is mainly contributed by thephotocurrent generated in DBP and C_(60)layers.When the FIrpic thickness is 8 nm,the filmsurface is very uniform with the smallest water contact angle.The impedance spectro-scopy demonstrates that the device resistance gradually increases from 4.1×10^(4)Ω(without Flrpic)to 4.6×10^(4)Ω(with 10-nm Flrpic)with the FIrpic thickness rise,simultaneously the device transits from the insulating state into the conductive statefaster for the thin Flrpic layer than the thick layer.展开更多
文摘用液相沉积法对纳米ZnO/TiO2进行了表面改性。用TEM、XRD和FTIR对产物进行了结构表征,用静态沉淀法分析了改性前后纳米ZnO/TiO2的分散稳定性,用紫外-可见分光光度计对其紫外屏蔽性能进行了检测。结果表明,改性纳米ZnO/TiO2表面存在致密的氧化铝膜,产物经充分分散后在有机介质中或水中的稳定时间分别由改性前的2 m in和5 m in提高到2 h和1 d,紫外线透过率由改性前的大于8.5%降低到小于7%。
基金We thank the National Basic Research Program （No. 2013CB834506）, the China National Funds for Distin- guished Young Scholar （No. 21225420）, the NationalNatural Science Foundation of China （Nos. 21474062, 21374062, 91527304 and 21404070） and Program of Shanghai Subject Chief Scientist （No. 15XD1502400） for financial support.
文摘In this paper, a kind of novel water-soluble chitosan-polydopamine （CHT-PDA） nanoparticles with a hydrody- namic diameter （Dh） around 10 nm were reported by the combination of self-polymerization of PDA and electro- static complexation between PDA and CHT in water/DMSO （W/D） mixture at the molar fraction of DMSO （XDMSO =0.37）. The preparation method was efficient with a yield of 98% around. The as-prepared water-soluble CHT-PDA nanoparticles exhibited effective UV-screen ability, enhanced visible-light transmittance and good cyto- compatibility via MTT assay, which might be used in transparent formulation for UV protection usage, especially in biological field including sun care application.
文摘目的:设计一种应用于角膜胶原交联术的紫外LED照射仪,可进行光强均匀的照射,以满足角膜胶原术的需求。方法:以资源丰富的C8051F410单片机作为控制系统核心,采用触摸屏作为人机交互界面,并通过精密电阻对工作电流进行采样,以实时监控紫外LED的工作状态;通过使用光学设计软件ZEMAX设计和优化的非球面镜匀光系统,实现紫外LED均匀照明。结果:在距离透镜45 mm、直径约为12 mm的范围内实现了均匀光强分布。最大辐照度为90.223 5 m W/cm2,探测器光通量为247.3 m W,光源能量利用率为60%。结论:该紫外LED照射仪在均匀度和辐照度方面均达到了角膜胶原交联术的需求,并在医院眼科中心通过对小白兔眼睛的照射实验已经验证了照射仪的性能,可以满足角膜胶原交联术的需求。
基金supported by the NationalNatural Science Foundation of China(Grant Nos.6167410l and 61504077)the Open Fund of State Key Laboratory of Luminescent Materials and Devices(South China University of Technology),China.
文摘In this work,a sky-blue luminescent down-shifting(LDS)layer bis[(4,6-difluorophenyl)-pyridinato-N,C^(2')]c(picolinate)iridium(II)(FIrpic)was inserted between tetraphenyl dibenzoperiflanthene(DBP)and Mo0_(3)as UV-screen and sensitizer for smallmolecule DBP/C_(60)based planar heterojunction(PHJ)solar cells.With 8-nm Flrpic theshort circuit current(J_(sc))and power conversion efficiency(PCE)of the device areenhanced by 28%and 15%,respectively,probably originating from the re-absorption ofthe photons emitted from Flrpic.The V_(oc)linearly increases over 1-nm Flrpic,ascribed tothe deeper HOMO level of Flrpic than DBP,while the fill factor continuously declines from 3-to 10-nm Flrpic.The EQE spectra prove that the J_(sc)is mainly contributed by thephotocurrent generated in DBP and C_(60)layers.When the FIrpic thickness is 8 nm,the filmsurface is very uniform with the smallest water contact angle.The impedance spectro-scopy demonstrates that the device resistance gradually increases from 4.1×10^(4)Ω(without Flrpic)to 4.6×10^(4)Ω(with 10-nm Flrpic)with the FIrpic thickness rise,simultaneously the device transits from the insulating state into the conductive statefaster for the thin Flrpic layer than the thick layer.
