共查询到18条相似文献,搜索用时 93 毫秒
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《工业技术与职业教育》2004,2(1):37-39
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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。 相似文献
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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)。 相似文献
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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。 相似文献
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武应涛 《化学推进剂与高分子材料》1992,(4)
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。 相似文献
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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。 相似文献
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《Ceramics International》2020,46(8):12096-12101
In this work, strong visible-light photocatalysis and pyro-catalysis for dye decomposition was observed in hexagonal wurtzite phase ZnS:Cu. As described herein, ZnS:Cu ceramic is shown to be a visible-light-responsive material with a band gap of ~2.77 eV. Under visible-light irradiation, the photocatalytic decomposition ratios of ZnS:Cu on 5 mg/L Rhodamine B, methylene blue, and acid orange 7 solutions reach 99.2%, 95.9%, and 78.8%, respectively. With respect to pyro-catalysis results, the decomposition ratio for acid orange 7 in the same concentration is 82.2%. For photo-/pyro-bi-catalysis, the decomposition ratio can reach ~95%. In summary, the ZnS:Cu ceramics exhibit strong visible-light photocatalysis and pyro-catalysis, making it a viable solution for decomposing synthetic dyes wastewater through utilizing the visible-light energy and cold-hot cycling. 相似文献
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《分离科学与技术》2012,47(8):1675-1703
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) 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). 相似文献
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Ping Yang Mengkai Lü Guangjun Zhou DuoRong Yuan Dong Xu 《Inorganic chemistry communications》2001,4(12)
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, λem515–560 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+. 相似文献
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《Ceramics International》2017,43(9):7193-7201
Undoped and transition metal (Cu, Mn, Cu:Mn) doped ZnS nanoparticles are synthesized by chemical co-precipitation method via an aqueous synthesis route. Synthesized samples are characterized by various techniques for their structural and optical properties. Crystallite size obtained from X-Ray Diffraction (XRD) is 1.68, 1.87, 1.50, 1.42 nm for undoped, Cu, Mn, Cu:Mn doped ZnS nanoparticles. The XRD, High Resolution Transmission Electron Microscopy, and Selected Area Electron Diffraction confirm the evolution of stable hexagonal phase of ZnS nanoparticles at low temperature. Energy Dispersive Spectroscopy confirms the doping of nanoparticles. Blue shift in UV absorbance shows the increase in optical bandgap with decrease in particle size. The Photoluminescence studies exhibit blue, yellow and red emission in visible region. Surface functionalization of nanoparticles is confirmed from Fourier Transform Infra Red spectroscopy. The present samples are tunable in wider range of emission and are prospective candidates for biological labels due to their fluorescent properties. 相似文献
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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. 相似文献