ZnS·CdS:Ag,Ni热敏型发光体的研制

给出了ZnS·CdSAg,Ni热敏型发光体的制备工艺和各种性能参数,论述了ZnS·CdSAg,Ni热敏型发光体的发光机理.     

ZnS·CdS∶Ag,Ni热敏型发光体的研制

给出了ZnS·CdS∶Ag ,Ni热敏型发光体的制备工艺和各种性能参数 ,论述了ZnS·CdS∶Ag ,Ni热敏型发光体的发光机理。     

ZnS:(Cu、Cl、Co、Gd、Er)光致发光体的研制

根据发光体的发光原理确定了ZnS：(Cu、Cl、Co、Gd、Er)光致发光体(以下简称ZnS基光致发光体)的基质、激活剂,给出了这种发光体的制备工艺和技术指标。     

ZnS：Cu，Co，Gd，Er发光体线膨胀系数因子的研究

在ＺｎＳ：Ｃｕ．Ｃｏ．Ｇｄ．Ｅｒ发光体与同种基础釉组成的发光釉中，选择发光体含量分别为１５ｗｔ％，２０ｗｔ％和２５ｗｔ％的３种发光融为试样，测定了它们的线膨胀系数。把这些线膨胀系数对发光体的含量进行了线性回归，得出了线膨胀系数、发光体含量和基础釉含量三者之间的函数关系式．此函数关系式表明：在发光釉中．随着发光体含量的增加，发光釉的线膨胀系数降低．这种发光体的线膨胀系数因子为０．５５×１０（－７）Ｃ（－１）。     

热敏型压敏胶带的研制

本热敏型压敏胶带的压敏胶以天然橡胶为主体,加入合成橡胶、增粘剂及其他助剂制成。胶带的基材是含有热敏剂的美纹纸。选用了一种比有机硅增粘剂交联温度低而且可以书写的高分子共聚物(100℃以下交联)作为防粘剂。确定了压敏胶的配方和胶带的生产工艺,并检测了各项性能。试验证明,该胶带在常温下无色,在高温时则会显示出标识、字迹或图案。在医学、科研等领域有广泛的用途。     

共沉淀法研制蓝色长余辉发光体

采用共沉淀法制备了蓝色长余辉发光体Ca_((1-x-y))Al_2O_4:Eu_x~(2+),D_y~(3+)进行了粒度分析、XRD、SEM等分析测试,考察了发光体及其前体粒度分布,物相组成和微观形貌等.此外,讨论了共沉淀法制备前体工艺条件的影响.结果表明,合成的发光体颗粒近似球形,分布均匀,粒径在10 μm左右.在紫外光激发下,发射光谱的最大峰值在450 nm附近,有一定的余辉性能.     

热敏型特种聚氨酯灌封材料研究

热敏型特种聚氨酯灌封材料室温下使用时间长、加热固化快、浇铸性能好。固化物具有优良的弹性、极佳的水解稳定性、良好的冷热循环性能和优异的电性能,是一性能优良的灌封材料,适用于小型电子元件和电器设备的封装和保护。     

ZnS:Cu纳米晶的制备及发光性质

以1-乙基-3-甲基咪唑四氟硼酸盐离子液体和水的混合液作为反应溶剂,采用油浴锅加热合成了ZnS:Cu纳米晶。分别利用XRD、TEM、荧光光谱仪对其物相、形貌及光学性能进行研究。结果表明:ZnS:Cu纳米晶为立方相闪锌矿结构,平均粒度为25 nm左右。随着反应温度的增加,其荧光强度先增加后降低,在200℃时,ZnS:Cu纳米晶荧光强度最强。随着Cu离子质量分数的增加其荧光强度先增加后降低,当Cu离子质量分数达到2%时,荧光强度达到最强。     

溶剂热法制备ZnS:Cu及其光学性质

采用溶剂热法,在表面活性剂十六烷三甲基溴化铵(CTAB)的作用下,制备了ZnS:Cu荧光粉体。分别考察了表面活性剂的用量、锌硫比、及Cu2+掺杂量对荧光粉晶型和发光性质的影响。通过X射线粉末衍射仪(XRD)和荧光分光光度计(PL)对合成的ZnS:Cu进行表征。结果表明,随着锌硫比的减少,衍射峰强度增大,结晶度增强,而其他条件的改变对ZnS晶型无明显影响。表面活性剂的用量、锌硫比、及Cu2+掺杂量对发光强度都有一定的影响。随着锌硫比的增大,发射峰强度有所增强且出现明显的蓝移,随着Cu2+掺杂量的增大,发光强度先增大后减小,当Cu2+掺杂量为0.2%(物质的量分数)时发光效果最好。随着表面活性剂用量的增加,发光强度先有明显的增强,随后又逐渐减弱,并且在n(Zn)∶n(CTAB)=100∶2时达到最强。     

ZnS基发光陶瓷釉的研制及发光机理探讨

本文介绍了ZnS基发光粉及其发光陶瓷釉的制备工艺,并对其发光机理进行了分析探讨。     

Monitoring ZnS Precipitation: Estimation,Error Analysis and Experiment Design

Abstract

A mass balance model of total soluble sulfide and free zinc with a second-order reaction term is theoretically able to reconstruct the zinc effluent concentration and the kinetic parameter (k). However, under real conditions this model predicts the zinc effluent concentration four orders of magnitude higher than the measured ones. The applied error analysis, based on linearization of the model followed by first-order variance propagation, showed that the accuracy of several of the input variables (flows and influent concentrations) jeopardized the estimation of the Zn concentration in the effluent, which is a phenomenon expected for every fast reaction with low product concentration. In order to overcome the inaccuracy issue, an “apparent solubility product” as a function of pS (11-20 König , J. ; Keesman , K.J. ; Veeken , A. ; Lens , P.N.L. ( 2006 ) Dynamic Modelling and Process Control of ZnS Precipitation . Separation Science and Technology , 41 ( 6 ): 1025 – 1042 . Dochain , D. ( 2003 ) State and parameter estimation in chemical and biochemical processes: a tutorial . Journal of Process Control , 13 ( 8 ): 801 – 818 . Del Villar , R.G. ; Thibault , J. ; Del Villar , R. ( 1996 ) Development of a softsensor for particle size monitoring . Minerals Engineering , 9 ( 1 ): 55 – 72 . Zamprogna , E. ; Barolo , M. ; Seborg , D.E. ( 2005 ) Optimal selection of soft sensor inputs for batch distillation columns using principal component analysis . Journal of Process Control , 15 ( 1 ): 39 – 52 . de Brauwere , A. ; De Ridder , F. ; Elskens , M. ; Schoukens , J. ; Pintelon , R. ; Baeyens , W. ( 2005 ) Refined parameter and uncertainty estimation when both variables are subject to error. Case study: estimation of Si consumption and regeneration rates in a marine environment . Journal of Marine Systems , 55 ( 3–4 ): 205 – 221 . Vojinovic , Z. (2007) A complementary modelling approach to manage uncertainty of computationally expensive models. Water Science and Technology , 56 (8): 1–9. Luther III , G.W. ; Rickard , D.T. ; Theberge , S.M. ; Olroyd , A. ( 1996 ) Determination of Metal (Bi)Sulfide Stability Constants of Mn²⁺, Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺ by Voltammetric Methods . Environmental Science & Technology , 30 ( 2 ): 671 – 679 . Luther III , G.W. ; Theberge , S.M. ; Rickard , D.T. ( 1999 ) Evidence for aqueous clusters as intermediates during zinc sulfide formation . Geochimica et Cosmochimica Acta , 63 ( 19–20 ): 3159 – 3169 . Yongsiri , C. ; Vollertsen , J. ; Rasmussen , M. ; Hvitved-Jacobsen , T. ( 2004 ) Air-water transfer of hydrogen sulfide:- an approach for application in sewer networks . Water Environment Research , 76 ( 1 ): 81 – 88 . Fischer , H. ; Schulz-Ekloff , G. ; Wöhrle , D. ( 1997 ) Oxidation of aqueous sulfide solutions by dioxygen. Part 1: Autoxidation reaction . Chemical Engineering & Technology , 20 ( 7 ): 462 – 468 . ) was calculated from the experimental data, allowing for the subsequent determination of an “apparent kinetic parameter” (k _A ), that excluding parallel reactions was between 1.7 × 10²³ – 6.2 × 10²⁴ L/(mol·h). This allowed for further tuning of the model such that the estimates of the Zn effluent concentration became of the same order of magnitude as the measured ones (10^?7 M Zn).     

Photoluminescence characteristics of ZnS nanocrystallites co-doped with Co and Cu

Zinc sulfide (ZnS) nanoparticles co-doped with Cu²⁺ and Co²⁺ have been prepared by precipitation from homogeneous solutions of zinc, copper and cobalt salt compounds, with S²⁻ as precipitating anion formed by decomposition of thioacetamide. X-ray diffraction shows that the average crystallite size of doped and undoped ZnS nanometer-scale samples is about 2–3 nm. Novel luminescence characteristics (strong and stable visible-light emission, λ_em515–560 nm) have been observed for the co-doped ZnS nanocrystals at room temperature. The relative fluorescence intensity of the co-doped sample is dramatically higher than that of undoped ZnS nanocrystallites. The emission wavelength of the co-doped samples varies with change in the impurity mole ratio of Cu²⁺ and Co²⁺.     

加热对ZnS:Mn/聚乙烯吡咯烷酮纳米纤维的影响

通过静电纺丝的方法制备了具有发光特性的ZnS:Mn/聚乙烯吡咯烷酮纳米纤维,电纺溶液中的溶剂是DMF、水、乙醇,使用了扫描电子显微镜,荧光光谱仪,透射电子显微镜,X-射线衍射仪,研究了加热对电纺溶液中含有DMF溶剂的电纺纤维的影响,结果是纤维之间的分离程度提高,纤维内部的纳米粒子变得清晰,纤维内部粒子的结晶度提高,该纤...     

花簇状ZnS:Mn微球的制备及荧光性能研究

采用CTAB辅助溶剂热法合成出花簇状结构的ZnS:Mn微球,并研究了反应温度,时间,溶剂,CTAB用量对样品形貌的影响.结果表明在170℃时加入0.8g CTAB溶剂热反应12h,所获得样品形貌规整,尺寸较均一;此外在反应体系中加入油酸获得尺寸更小的花簇状ZnS:Mn.并对花簇状结构的生长机制进行了阐述.     

纳米硫化锌的制备与应用研究现状

介绍了纳米硫化锌的制备方法,固相法、液相法、气相法,纳米硫化锌性能优越,用途广泛.     

Tunable blue-green-emitting wurtzite ZnS:Mg nanosheet-assembled hierarchical spheres for near-UV white LEDs

Mg-doped ZnS hierarchical spheres have been synthesized via hydrothermal method using mixed solvents of ethylenediamine and DI water without any surface-active agent. The surface morphology and microstructure studies revealed that the hierarchical spheres were consisted of many well-aligned nanosheets with width 10 nm and length about 50 ~ 100 nm. X-Ray diffraction results show that the ZnS:Mg hierarchical spheres have wurtzite structure with high crystallinity. The absorption edge in the diffuse reflection spectra shifts towards lower wavelength with increasing Mg concentration, indicating an expansion in the bandgap energy that is estimated to be in the range of 3.28 to 3.47 eV. Blue-green photoluminescence with tunable intensity and peak position was observed depending on the Mg content. The Mg²⁺-activated ZnS phosphor can be good candidates for blue-green components in near-UV white light-emitting diodes.