共查询到20条相似文献,搜索用时 93 毫秒
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综述纳米粒子改性塑料的方法和研究进展,总结了纳米粒子改性塑料的力学性能、摩擦学性能、电学性能和阻隔性能、生物学性能、流变性能和加工性能等性能,指出纳米粒子改性塑料的和研究方向。 相似文献
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介绍了纳米Al_2O_3、纳米SiO_2、纳米TiO_2、纳米MgO、纳米ZnO、纳米BaTiOO_3、倍半硅氧烷(POSS)、石墨烯和碳纳米管改性聚酰亚胺(PI)的研究进展,综述了各种纳米粒子的改性效果,其中纳米Al_2O_3、纳米SiO_2、纳米TiO_2、纳米MgO、纳米ZnO、纳米BaTiO_3对PI的改性研究主要集中在热性能、电学性能、力学性能等方面;石墨烯和碳纳米管改性PI具有优良的导电性;POSS使PI的抗氧化等性能有显著的改善。分析了偶联剂对改性薄膜性能的影响,并对今后纳米改性PI的发展趋势进行了展望。 相似文献
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纳米氧化锌的性能及其在涂料中的应用 总被引:10,自引:0,他引:10
由于尺寸效应,纳米氧化锌具备普通氧化锌所没有的特殊性能。介绍了电化学、物理改性和化学改性等纳米氧化锌的表面处理方法,以及溶胶凝胶、原位聚合、共混和插层等纳米涂料的制备方法。还介绍了纳米氧化锌的性能,如紫外屏蔽性能、补强性、抗茵除臭性、阻燃性等,分析了纳米氧化锌具备这些特殊性能的机理。由于具备以上性能,纳米氧化锌作为颜填料对涂料性能有明显的改善作用并赋予了涂料新的功能。对纳米氧化锌在涂料中的应用前景提出了展望。 相似文献
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熔块釉中外加氧化锌的作用及对铅,镉溶出量影响的应用研究 总被引:1,自引:0,他引:1
本文研究了熔块釉中外加氧化锌的作用及不同类型的氧化锌对铅、镉溶出量的影响,并指出用间接法氧化锌(BA01-05(I型)优级品)代替直接法氧化锌(ZnO-X1),对降低陶瓷铅镉溶出量,使其达到美国FDA准则要求有比较理想的效果。 相似文献
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《Journal of the European Ceramic Society》2000,20(6):667-673
The surface charge on some commercially available zinc oxide powders in aqueous solution has been studied. Aqueous suspensions of zinc oxide could not be stabilized electrostatically because of the decreasing pH of suspensions in the region between 7.2 and 12 as a result the transformation of colloidal Zn(OH)2(S) particles to Zn(OH)2(aq) ions. The major cationic impurity in the zinc oxide powders is lead, whereas in the aged suspensions of the same powders, zinc and sulphate ions dominate. These ions have the the most significant effect in creating an electrical double layer shell around the zinc oxide particles. The effect of these ions on the surface potential of zinc oxide was studied and the point of zero charge and charge reversal were found to be a direct function of the zinc and sulphate ions' concentration in the supernatant. 相似文献
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M. Mokaddem 《Electrochimica acta》2010,55(27):7867-329
The polarization behaviour of zinc in alkaline solution has been investigated using atomic emission spectroelectrochemistry. By independently measuring the oxidation rate of zinc (electrical current) and the rate of Zn2+ dissolution (partial elemental current) it is possible to calculate the amount of insoluble zinc cations produced at any instant. Assuming the insoluble cations are present as a zinc oxide film, the growth of this film as a function of potential and time was determined. On the basis of kinetic evidence, it was found that at least three forms of zinc based oxide/hydroxide films form during polarization experiments. Type I oxide formation occurs when the metal/electrolyte interface becomes locally saturated with Zn2+ ions. Type II oxide forms on the metal surface underneath the film of Type I oxide but has little inhibiting effect on zinc dissolution. Type III oxide is produced in much smaller quantity and results in a transition to the passive state. This may be due to a potential induced transition of Type II → Type III oxide. 相似文献
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Preliminary comparative studies of zinc and zinc oxide electrodes on corrosion reaction and reversible reaction for zinc/air fuel cells 总被引:1,自引:0,他引:1
Even though Zn/air energy system is considered to be a promising power energy source, it has been limited to be applied for an electrically rechargeable system basically due to the problem of the irreversible reaction and the corrosion reaction. In this paper a novel attempt has been made to compare the behavior of zinc electrode with a zinc oxide electrode and a modified zinc oxide electrode containing zinc oxide and lead oxide. The hydrogen overpotential is favorable in the zinc electrode, and the modified zinc oxide electrode shows the improved properties showing the more negative potential than the case of the zinc oxide electrode. Investigations of cyclic voltammogram reveal that the pure zinc electrode is irreversible, while both the zinc oxide and the modified zinc oxide electrodes are reversible. However, as far as dendrite formation is concerned there is no marked improvement in case of the zinc oxide and the modified zinc oxide electrodes. 相似文献
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介绍了T202A型加氢催化剂和高温氧化锌脱硫剂在焦化干气脱硫装置上的串联使用情况。工艺标定结果表明,T202A型加氢催化剂具有很强的有机硫加氢转化和烯烃加氢功能,转化率较高,操作弹性大;高温氧化锌脱硫剂具有较高的无机硫脱除精度,二者串联使用时,可以满足设计要求。 相似文献
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氧化锌作为一种良好的硫化活性剂,在橡胶生产中已被广泛使用,但锌基材料对人体健康和生态环境存在不良影响,因此如何在橡胶配方中减少锌的含量已经成为目前橡胶行业重要的研究课题。纳米氧化锌因为具有纳米粒子特有的优势,因此在使用中可以达到锌减量的目的,但纳米粒子容易团聚,限制了纳米效应的发挥;广东韶关凯鸿纳米材料有限公司开发了一种负载型的纳米氧化锌,将纳米氧化锌粒子包覆在载体上的新型制品,提高反应活性,减少团聚,可以使纳米氧化锌充分发挥纳米粒子的优势,同时有效的减少锌在橡胶制品中的残余量。本工作分别采用普通氧化锌、纳米氧化锌、负载型纳米氧化锌(C型、A型、S型)作为活化剂,其中负载型纳米氧化锌依据载体不同进行分类,C型的载体为碳酸钙,A型的载体为氧化铝,S型载体为二氧化硅。通过各项性能测试实验,重点研究负载型纳米氧化锌对橡胶综合性能的影响。实验结果表明,相对于普通氧化锌,负载型纳米氧化锌作为活化剂,可以在锌的使用量明显下降的情况下,制备出达到甚至优于普通氧化锌制品性能的橡胶复合材料。其中,3份用量的A型负载型纳米氧化锌的活化作用最优。 相似文献
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The properties of nano‐zinc oxide master batch filled butadiene styrene rubber (SBR) systems were researched in comparison with those of common zinc oxide and nano‐zinc oxide filled systems. First, the nano‐zinc oxide master batch was prepared and the cure characteristics of three different kinds of zinc oxide filled SBR composites were studied; second, the mechanical properties and wear resistance were compared; then, the improved mechanical properties were confirmed by dynamic mechanical properties and transmission electron microscopy. Finally, the zinc oxide amount reducing mechanism was analyzed. Results show that nano‐zinc oxide master batch filled SBR system has better mechanical properties than those of nano‐zinc oxide and common zinc oxide filled systems, which is due to the improved dispersion by master batch mixing technology. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 922–930, 2006 相似文献
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在制造硒硫化镉颜色玻璃时 ,除了加入玻璃的基本组成 Si O2 和着色剂 Cd S、Se外 ,还必须加入 Zn O、碱金属氧化物、冰晶石、B2 O3和重金属硫化物等次要组分。这些次要组分在制造硒硫化镉颜色玻璃过程中起着重要作用。Zn O对防止着色剂硒和硫的挥发起直接作用 ,是制造硒硫化镉颜色玻璃不可缺少的组分之一。碱金属氧化物、冰晶石、B2 O3主要起助熔作用 ,降低玻璃熔制温度 ,加速玻璃的澄清和均化 ,间接防止着色剂硒和硫的挥发。微量重金属硫化物作为晶核形成剂 ,使 Cd S(Se)微晶固溶体容易成核和长大 ,加速并简化玻璃的显色工艺 相似文献