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龚荣洲 《武汉理工大学学报(材料科学英文版)》2000,15(3)
Polyaniline-barium titanate (PAn-Ba-TiO_3) ultrafine composite particles were prepared by the oxidative polymerization of aniline with H_2O_2 while barium titanate nanoparticles were synthesized with a sol-gel method. The infrared spectrogram shows that the polymerization of PAn in the hybrid process of PAn-BaTiO_3 is similar with the polymeric process of pure aniline, and there is interaction of PAn and BaTiO_3 in the PAn-Ba-TiO_3. SEM and TEM results show that the average diameter of the composite particles is 1.50/~m and the diameters of BaTiO_3 nanoparticles are 5—15 nm in the composite particle. The electrical conductivity of the ultrafine composite particles is transformable from 10~0 to 10~(11)S/cm by equilibrium doping or dedoping method using various concentration of HCl or NaOH solutions. 相似文献
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以硅藻土为载体,采用溶胶-凝胶-低温烧结法制备了硫掺杂二氧化钛负载型微孔-介孔结构复合光催化剂.物相分析表明TiO2-xSx样品为纯的锐钛矿相,TiO2包覆在硅藻土载体表面形成了复合结构.紫外-可见漫反射谱图显示S掺杂后的TiO2-xSx(350℃)样品吸收带边发生了明显的红移,负载型复合光催化剂显示出比TiO2-xSx样品更强的可见光吸收性能.当复合光催化剂中硅藻土的负载量为30%(质量分数)、硫的掺杂量为0.03%(摩尔分数)时,以氙灯为辐照光源,光催化苯酚溶液的降解率最高.在pH=5.83、催化剂用量为2g/L、初始质量浓度为10mg/L的条件下,苯酚在光照2h后降解率达到85%.催化剂重复使用4次后,苯酚的降解率仍在80%以上. 相似文献
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采用RF溅射工艺制备了FeCoNiB-SiO2系薄膜。研究了Ni添加量对该种薄膜微结构和电磁性能的影响。结果表明,添加适量的Ni有利于FeCoNiB-SiO2薄膜获得优良的微波电磁性能。通过控制Ni的添加量,可以得到在GHz频段同时具有高磁导率和高损耗的薄膜样品,其磁导率实部μ'和虚部μ"在0.5~2.0GHz的宽频带范围内分别大于240和100,在2.1GHz处更是均大于400,其电阻率也达到了868×10–6?·cm。该薄膜可应用于微波吸收材料或抗电磁干扰的设计中。 相似文献
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提出了一种基于负磁超材料耦合增强效应的无线能量传输系统。首先,利用磁偶极子近似方法对引
入负磁超材料的无线能量传输系统的传输特性进行了建模和理论分析。然后,依据理论模型,设计了小型化无线能
量传输系统,并通过仿真和实验进行了验证。实验结果表明:在无线能量传输系统中加入非正定负磁超材料板,在
10cm 距离下传输效率从0. 7%提高到22%,且其传输效率随距离增加而衰减的速度会随负磁超材料的引入而减小。 相似文献
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龚荣洲 《武汉理工大学学报(材料科学英文版)》2001,(1)
Cobalt-phthalocyanine/iron nanocomposite particles have been obtained using method of composite in situ, with the mixture of carbonyl iron and solution of cobalt ( Ⅱ ) - phthalocyanine (Co-Pc) ultrasonic dispersing in N,N-dimethyl-formamide (DMF). Structure characterization of their inner and surface have relation with method of carbonyl iron joined in the mixture, contents of carbonyl iron and Co-Pc in the mixture of Co-Pc ultrasonic dispersing in DMF. With a method of composite in situ controlling reasonable experiment condition, it can be obtained that cobalt-phthalocyanine/iron nanocomposite particles has completely been covered with Co-Pc, they had structure of Chinese gooseberry in inner and mere made up of almost regular spherical shape and the average diameter is 1. 4 μm. 相似文献
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铁镍纤维的磁场诱导制备及电磁性能研究 总被引:1,自引:0,他引:1
羰基铁和羰基镍的混合蒸汽受热后分解产生的铁、镍原子在外加磁场的诱导下形成铁镍纤维.通过控制羰基铁和羰基镍的体积比,混合蒸汽的分解温度和外加磁场强度等因素,可制备出铁含量在10%~90%(质量分数)、镍含量在90%~10%(质量分数)之间的铁镍纤维,其直径可在2~10μm内调控.分析了铁镍纤维的结构特征,结果发现铁含量不同的铁镍纤维,碳元素以不同形式存在,其形貌呈现直线型、"Y"字型和"Z"字形特征.并通过对影响铁镍纤维生长因素的调控,可实现铁镍纤维形貌和直径的可调.将铁镍纤维和树脂混合后制成波导样品,采用网络分析仪在X波段测量了铁镍纤维的电磁参数.结果显示铁镍纤维具有较高的磁导率和较好的频散特性.在8GHz处磁导率实部接近3,虚部约为1.2. 相似文献