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氧化锌在国民经济建设中是不可缺少的重要基础化工原料和新型材料,随着近年来伪劣氧化锌的出
现,使得氧化锌现行标准的局限性日益显现。通过理论基础和实验验证,对氧化锌现行标准中锌含量测定方法的局限性进行了论证。中国现行氧化锌标准中锌含量的测定方法仅局限于纯品或近乎纯品的氧化锌。如果被测氧化锌是含有大量杂质金属元素的伪劣氧化锌,那么按国家标准或行业标准定量分析时,由于大量杂质金属元素的存在,超出了掩蔽剂掩蔽的限量,使得锌含量的检测结果高于实际锌含量。因此,中国氧化锌现行标准目前无法正确评价伪劣氧化锌的质量水平。目前,急需针对伪劣氧化锌的关键检测技术开展研究,制定可行有效的伪劣氧化锌的鉴别与氧化锌含量的检测技术。 相似文献
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氧化锌生产方法及研究进展 总被引:3,自引:0,他引:3
综述了普通氧化锌(包括直接法氧化锌、间接法氧化锌和湿法氧化锌)、活性氧化锌和纳米氧化锌的生产及研究进展.介绍了普通氧化锌的生产工艺和制备方法;活性氧化锌的特点及生产方法的改进.也按照固相、气相和液相分类法叙述了纳米氧化锌生产及研究进展.对上述各种氧化锌生产方法的优点和缺点进行了评述.并对几种氧化锌的研究、生产和应用提出了展望. 相似文献
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研究了间接法氧化锌、复合氧化锌S70和复合氧化锌A20对三元乙丙橡胶硫化特性、力学性能及热氧老化性能的影响.结果表明,加入复合氧化锌S70或A20,相应胶料的硫化特性、力学性能以及复合氧化锌的活化效果均优于间接法氧化锌;复合氧化锌S70的分散效果较好;加入复合氧化锌S70或A20后,胶料的老化性能变化较大,但力学性能仍... 相似文献
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高岭土催化制备四脚状氧化锌晶须 总被引:1,自引:1,他引:0
以锌粉为原料,高岭土为模板型催化剂,研究了锌在高温气相氧化反应条件下的成核、生长最终生长成为四脚状氧化锌晶须(T—ZnOw)的生长习性。通过扫描电镜对晶体形态进行研究,经分析表明模板催化剂的结构及用量对T—ZnOW形态有着影响的显著,并利用其生长习性的特点,制备了大小分布均一且形态规整的T—ZnOW。 相似文献
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用毒重石还原成粗制氧化钡作为原料,水解温度控制在80~90℃之间,粗制氧化钡和水的固液比为0.250~0.278 g·ml-1,可以提高八水氢氧化钡的收率,同时采用工业氧化锌脱硫剂去除产品中杂质硫的方法,可以进一步确保其产品的质量。 相似文献
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《Ceramics International》2016,42(11):13053-13060
Zinc Oxide nanostructures have been hybridized on carbon fiber bundles though joule-heating carbon fiber coated with metallic zinc powder. Upon sufficient heat transfer from the carbon fiber in ambient atmospheric conditions, the metallic Zinc coating will undergo combustion. The combustion reaction will yield a variety of ZnO nanoparticles on the carbon fiber bundles. This simple cost-effective technique provides a fast, non-catalytic, and economic approach for the hybridization of ZnO nanowires on advanced textiles. The integration of ZnO nanostructures on the carbon fiber bundles can open up new avenues for multifunctional composites or smart materials. The ZnO nanostructures on the carbon fiber bundle have been characterized through SEM, XRD, and TEM. The new method and minimum heating rates to cause ignition of Zn powders are discussed. 相似文献
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为优化金属氧化物薄膜晶体管( IGZO-TFT)的特性,采用射频磁控溅射法沉积IGZO薄膜作为半导体活性层,制备出具有刻蚀阻挡层( Etch stop layer ,ESL)结构的IGZO TFT,在2.5 G试验线上研究了IGZO沉积过程中O2浓度、IGZO沉积后N2 O等离子体处理、ESL的制备温度和ESL沉积过程中N2 O/SiH4的比例等关键工艺条件对IGZO TFT的阈值电压( Vth )的影响。实验结果表明:IGZO沉积过程中O2浓度的增加、IGZO沉积后N2 O等离子体处理和ESL制备温度的降低会导致IGZO TFT的Vth正偏移。 相似文献
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《Ceramics International》2017,43(13):10041-10051
Zinc Oxide (ZnO), ZnO/GO (Graphene Oxide) and ZnO:Ag/GO nanocomposite thin films were deposited on glass substrates using a simple cost-effective automated jet nebulizer spray pyrolysis technique for photocatalytic degradation of organic dyes. The ZnO:Ag/GO film exhibits superior photocatalytic activity when compared with ZnO and ZnO/GO films. The degradation rate constant values of pristine ZnO and ZnO/GO films are found to be 0.0143 and 0.0176 min−1, respectively whereas that of ZnO:Ag/GO is 0.0567 min−1. The possible mechanism involved in the enhanced photocatalytic activity of ZnO:Ag/GO films for the degradation of Methylene Blue dye is proposed with the help of structural, optical and photoluminescence studies. The powder XRD profile confirms the hexagonal wurtzite structure of the synthesized catalysts. The results of Raman, XPS and EDX studies confirm the presence of GO in the ZnO/GO and GO and Ag in the ZnO:Ag/GO films. 相似文献
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《Journal of the European Ceramic Society》2022,42(6):2789-2797
In this study, the Cold Sintering Process (CSP) is used to design ceramic-polymer composites with Polyvinylidene fluoride Trifluoroethylene (PVDF-TrFE), a ferroelectric co-polymer, as an active intergranular grain boundary phase in a semiconducting Zinc Oxide (ZnO) electroceramic matrix. The conductivity is modeled with Schottky thermionic emission and Fowler-Nordheim tunneling as a function of both temperature and voltage. In addition, through details of the dielectric characterization, the interfaces are also considered with the effective permittivity resulting with a space charge relaxation of the PVDF-TrFE. The Maxwell-Wagner-Sillars (MWS) model was used to predict ~ 3 nm as the thickness of the intergranular PVDF-TrFE phase controlling electrical properties of the composite. Transmission electron microscopy (TEM) investigation of the grain boundary phase confirms the polymer thicknesses to the dimensions predicted from the various electric measurements and subsequent modeling. 相似文献
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研究了以炼铅厂含锌烟灰为原料,经盐酸浸取、高锰酸钾氧化、锌粉置换制备氯化锌溶液的工艺。以锌的浸出率最高,杂质铅的浸出率最低,铁、锰、铅、镉、铜脱除最彻底为目标,实验得出最佳的酸浸和净化条件:40 g次氧化锌、71 mL浓盐酸、130 mL水在30 ℃下浸取50 min后,过滤,洗涤滤渣,滤液定容为250 mL,取200 mL滤液,滤液中加高锰酸钾0.013 6 g,10 ℃下氧化2 h后过滤,取200 mL二次滤液向其中加锌粉0.12 g,40 ℃下反应50 min后过滤,得浓度为1.63 mol/L的氯化锌溶液。在上述工艺条件下,锌的浸出率为94.2%,氯化锌溶液中杂质离子含量满足HG/T 2323-2012《工业氯化锌》中优等品的要求,可用来生产符合GB/T 19589-2004《纳米氧化锌》规定的Ⅰ类纳米氧化锌。 相似文献
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《Ceramics International》2017,43(9):6709-6720
Zinc Oxide (ZnO) nanoparticles were synthesized by wire explosion process through deposition of different levels of energy to the exploding conductor in oxygen ambience at different pressures. The produced nanoparticles were analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive analysis of X-rays (EDAX) and by Brunauer-Emmett-Teller (BET) studies. Energy dependent formation reaction mechanisms were formulated based on Born-Haber cycle. The size dependent gas phase reaction energetics was analyzed by using Hess's diagram. Butler's multicomponent molten oxide model was adopted to predict the surface tension of ZnO. Thermodynamic modelling studies revealed that the amount of energy deposited has an impact on saturation ratio, activation free energy, and nucleation rate of nanoparticles. It is observed based on experimental and modelling studies that the amount of energy deposited to the current carrying conductor, ambient pressure of oxygen and the saturation ratio influence the size of nanoparticle formed. 相似文献