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1.
针对倒三角直槽型或倒金字塔型能量转换结构的同位素微电池难于加工以及放射性薄膜不均匀等缺陷,设计了一种较为简单的平板型能量转换结构.引入金属区这一结构,增强了放射源薄膜的接触稳定性.63Ni放射源电镀实验最终得到了一组理想的短路电流和开路电压数据.结果表明,该结构与传统的能量转换结构相比有更稳定的功率输出. 相似文献
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微通道板电极表面的XPS分析 总被引:4,自引:1,他引:3
为探索微通道板的噪声来源,利用X射线光电子能谱对国内和国外MCP电极表面进行组分分析。实验发现,在国外MCP电极表面上只检测Ni,Cr,C,O等谱峰,而在国内的MCP电极表面还检测到K,Na,Si等原子谱峰,且在国产未镀电极的MCP表面检测出K的原子谱峰。 相似文献
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为探索微通道板的噪声来源,利用X射线光电子能谱对国内和国外MCP电极表面进行组分分析。实验发现,在国外MCP电极表面上只检测到Ni,Cr,C,O等原子谱峰,而在国内的MCP电极表面还检测到K,Na,Si等原子谱峰,且在国产未镀电极的MCP表面检测出K的原子谱峰。分析认为,MCP体内的K有向表面偏析的现象;MCP电极表面上的杂质,如K,Na,Si等是MCP噪声来源之一;国产MCP表面的杂质不仅与MCP镀膜材料纯度、系统真空度有关,而且还与电极膜层的致密性有关。 相似文献
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一种新型基于MEMS的同位素微电池的研究 总被引:1,自引:0,他引:1
介绍了同位素微电池的工作原理及结构组成.阐明了其从工作原理上区别于原有的核电池,采用和太阳能电池光生伏特相似的辐生伏特效应.对同位素微电池的工艺作了详尽的介绍.提出了使用垂直侧壁方孔阵列的能量转换结构,相比传统的同尺寸开口且等深的倒三角直槽型或倒金字塔型的能量转换结构表面积增大了120%以上;引入了电镀区这一新结构,增强了同位素微电池的工作稳定性. 相似文献
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金属钴对储氢合金电极的表面修饰研究 总被引:2,自引:0,他引:2
运用真空蒸镀法时MH/Ni电池储氢合金电极进行了镀覆金属钴的表面修饰,测试了电池的放电容量、高倍率放电性能、循环寿命和充电时的内压,利用XPS和XRD时电极进行了表面和结构分析。实验结果表明,运用该方法对电极进行表面修饰可以降低电池内阻,提高电池的放电容量和放电电压,极片经过修饰的电池,5C(8.5A)放电容量提高了120mAh,放电平台电压提高了约0.05V,内阻降低了19.3%。极片经过表面镀钴后,显著改善了电池的循环性能,电池500周循环后的放电容量仍为初始容量的94.09/6,同时,电池在充电时的内压有了明显的降低,充电效率有了较大的提高。 相似文献
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通过对水溶液锂离子电池电极材料的制备方法、结构、电化学性能、充放电过程等方面的论述,总结了近年来水溶液锂离子电池电极材料的研究状况,并对存在的问题进行了分析。探讨了采用不同化合物、不同制备方法和改性方法来提高其比容量和循环稳定性的可能性。 相似文献
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沟槽微结构减阻与疏水表面减阻是两种有效的水下减阻技术。将两种典型的减阻技术进行联合协同,在聚对苯二甲酸乙二醇酯-1,4-环己烷二甲醇酯(PETG)基底表面采用激光微刻方法构筑微米级沟槽结构,采用二步喷涂法先后在微沟槽表面覆盖环氧树脂层与改性的纳米SiO2颗粒,从而实现沟槽型微纳复合结构表面的制备。利用接触角测量仪、体视显微镜、拖曳式摩擦阻力测试设备对复合结构表面的润湿性、水下气膜状态及水下减阻性能进行表征。结果表明,沟槽型微纳复合结构表面为超疏水表面,液滴在该表面处于“Cassie-Baxter”润湿状态;在水下,复合结构表面具有束缚大尺寸气膜的能力,气膜驻留于表面沟槽之中且促使了表面的水下减阻效果的产生;对比单纯的沟槽微结构表面与喷涂SiO2颗粒光滑表面,制得的沟槽型复合结构表面在沿垂直于沟槽方向运动时最大减阻率可达20.82%,同时表面气膜的稳定性也最佳。 相似文献
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Kaifeng QinLinjun Wang Jijun ZhangJiahua Min Jian HuangXiaoyan Liang Ke TangYiben Xia 《Vacuum》2012,86(7):827-829
The method of the electrode deposition process plays a vital role in determining the contact characteristics, which is often one of the dominant factors influencing the CdZnTe detector performance. In this work, a modified deposition process named two-step process for the electrode fabrication of CdZnTe detectors, was developed. This deposition process can dramatically increase the adhesion strength and reduce the inhomogeneity of the metal/semiconductor interface, and improve the detection ability of high energy radiation such as X-rays and gamma-rays. Scanning acoustic microscopy, shear tests, current-voltage test and energy spectra characteristics measurements were carried out in this work. 相似文献
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C Ganguly 《Bulletin of Materials Science》1993,16(6):509-522
Hydrated gel-microspheres of U, Pu, Th oxide or oxide plus carbon mixture of diameter 400–800μ were prepared by ammonia gelation processes. They were dried and subjected to suitable treatment for obtaining free-flowing
oxide, carbide or nitride micro-spheres of diameter 200–400μ suitable for direct pelletization and sintering. The oxide, carbide and nitride pellets were, in general, sintered at high
temperature in Ar+8% H2. However, for UO2 and (U, Pu)O2 pellets low temperature (1200 °C), short duration (1 h) oxidative (CO2 or N2+air) sintering (LTS) was also successful, thereby reducing electrical energy and gas consumption during sintering. Thus,
the combined SGMP-LTS process simultaneously minimized “radiotoxic dust hazard” and fuel fabrication cost in case of UO2 and (U, Pu) O2 pellets. 相似文献
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Guo-Zheng Li Wan-Min Yang Xiao-Fang Cheng Jing Fan Xiao-Dan Guo 《Journal of Materials Science》2009,44(23):6423-6426
The top seeded infiltration and growth process (TSIG) is an effective way for the preparation of bulk REBa2Cu3O7−x
(RE-123) with finely dispersed RE2BaCuO5 (RE-211) particles compared to the conventional melt growth (MG) method. However, it is more complicated and time-consuming
because three kinds of precursor powders, involving RE-211, RE-123, and BaCuO2, have to be prepared before the conventional TSIG process. In this article, a new liquid source (NLS) composed of RE2O3 (RE-200), BaCuO2, and CuO powders, has been found for simplifying the TSIG process, which is different from the regular liquid source (RLS)
composed of RE-123 and Ba3Cu5O8. In this modified TSIG technique, what we need is only to prepare RE-211 and BaCuO2 precursor powders for the whole TSIG flow. Single-domain GdBCO bulk superconductors have been fabricated using the RLS and
NLS separately. The morphology, microstructure, and levitation force of the GdBCO bulks have also been investigated. The results
indicate that the NLS can be used to simplify the process flow, reduce the cost and improve the efficiency on the fabrication
of single-domain GdBCO superconductors. 相似文献
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The present work reports a simple and effective way to produce copper compound films on zinc substrate via solution-immersion process. The surfaces were characterized by field-emission scanning electron microscopy, Fourier transform IR, X-ray photoelectron spectrum and X-ray powder diffraction. The wettability of the surfaces is also investigated. The as-prepared superhydrophobic surfaces exhibit high adhesion to water and scratches on the surfaces could be repaired by immersing the damaged samples into the solution again. 相似文献
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Xuejiao ChenJian Zhang Huhua XuShichao Hui Meiguang Zhu 《Materials science & engineering. C, Materials for biological applications》2012,32(2):369-374
A novel and reproducible method to fabricate submicron-gap electrodes using thermal oxidation has been presented. In this method, oxidation process determines the gap distance. The micron-level silicon electrode gaps with different shapes were first generated on the silicon wafer by conventional photolithography followed by deep reactive ion etching process. Then thermal oxidation was conducted to realize the transition from silicon to silicon dioxide, i.e. reduce the gap width. Finally, the planar electrodes with sub-micron spacing were formed by metallization and photolithography. Scanning electron microscopy (SEM) was used to examine the electrode configuration and the electrical properties of as-prepared electrode pairs were also characterized. The results showed that using the method investigated in this work, Au electrodes with a submicron-sized gap could be easily fabricated, with good uniformity and reproducibility. 相似文献
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《Materials Letters》2005,59(24-25):3095-3098
Nanoscale polymer silica hybrid nanochannel array of average channel size of ∼50 nm were fabricated by electrokinetically induced silicification reaction within a polymer template. The uniform growth of silica can be realized by appropriate combination of reactant concentration and electric field strength. The formed silica leads to the reduction in channel size, and provides substantial reinforcement to the polymer nanostructure. Such nanochannel arrays may be a useful platform for a variety of biomedical applications. 相似文献
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S. V. Dorozhkin 《Inorganic Materials》2008,44(2):207-210
Problems are addressed that relate to the use of standard processes (involving several consecutive steps) for the fabrication
of calcium phosphate bioceramics: process duration (up to 72 h), low chemical yield (notably lower than 100%), and a large
amount of byproducts (largely in the form of alkaline (pH ∼ 10) aqueous solutions). A new, environmentally friendly, one-step
process is proposed for the preparation of calcium phosphate bioceramics.
Original Russian Text ? S.V. Dorozhkin, 2008, published in Neorganicheskie Materialy, 2008, Vol. 44, No. 2, pp. 253–256. 相似文献
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A simple and efficient activation process was conducted by deposition of palladium (Pd) nanoparticles on PMMA surface using a microwave-assisted polyol method with ethanol used as the reductant. The newly synthesized Pd nanoparticles were utilized as an activator for electroless nickel deposition. TEM images revealed that Pd nanoparticles of size 4-6 nm are formed evenly over the PMMA surface. A tight, smooth and continuous Ni plating layer was coated on these Pd nanoparticle activated PMMA microspheres. In contrast, a rough and discontinuous Ni film was obtained for the sample activated with a conventional sensitization/activation procedure. 相似文献