共查询到17条相似文献,搜索用时 46 毫秒
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本文扼要介绍了一项关于硒氰酸钾对高速感光乳剂化学增感作用的研究。实验结果表明,单独使用硒氰 酸钾增感不能获得优于硫氰酸钾的增感效果,但与硫氰酸钾使用,进行硒、硫、金协合增感,却能取得较为理想的感光性能。 相似文献
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硫金增感核是强有力的电子陷阱;还原增感核起到加强原有电子陷阱的作用,具有产生光电子的能力;硫增感核是电子陷阱,但大的硫增感核具有一定空穴陷阱的效果。 相似文献
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本文主要论述了硫金增感依次分开加入[以下简称(S,Au)]与混合在一起后加入[以下简称(S Au)]的照相性能的差异,并从建立的模型来说明存在差别的原因. 相似文献
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本文归纳了几种影响最佳选用增感染料的因素,如:卤化银的成分、颗粒的结构、与其他增感剂或有机补加剂合用、添加的最佳工艺点等,列举的实例摘选自最近发表的专利。 相似文献
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G-47黑白增感显影液,是中国乐凯胶片集团公司系列胶片冲洗加工套药中的一个新品种,主要用于非正常曝光条件下,胶片的化学处理过程,同时亦可配合超高感材料的上市,具有很好的实用性。 相似文献
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Caixia Li Zhucong Xi Dexiang Guo Xiangju Chen Longwei Yin 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(4)
Despite great progress in lithium–sulfur batteries (LSBs), great obstacles still exist to achieve high loading content of sulfur and avoid the loss of active materials due to the dissolution of the intermediate polysulfide products in the electrolyte. Relationships between the intrinsic properties of nanostructured hosts and electrochemical performance of LSBs, especially, the chemical interaction effects on immobilizing polysulfides for LSB cathodes, are discussed in this Review. Moreover, the principle of rational microstructure design for LSB cathode materials with strong chemical interaction adsorbent effects on polysulfides, such as metallic compounds, metal particles, organic polymers, and heteroatom‐doped carbon, is mainly described. According to the chemical immobilizing mechanism of polysulfide on LSB cathodes, three kinds of chemical immobilizing effects, including the strong chemical affinity between polar host and polar polysulfides, the chemical bonding effect between sulfur and the special function groups/atoms, and the catalytic effect on electrochemical reaction kinetics, are thoroughly reviewed. To improve the electrochemical performance and long cycling life‐cycle stability of LSBs, possible solutions and strategies with respect to the rational design of the microstructure of LSB cathodes are comprehensively analyzed. 相似文献
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Preparation of high purity tellurium by zone refining 总被引:1,自引:0,他引:1
N. R. Munirathnam D. S. Prasad CH. Sudheer A. J. Singh T. L. Prakash 《Bulletin of Materials Science》2002,25(2):79-83
This paper describes purification process of tellurium metal using zone refining technique under high purity hydrogen gas
ambient in normal room environment. Process automation by newly designed stepper motor drive and allied process control instruments
circumvent the complexity of electrical motors. It is observed that overall impurities have gone down substantially from 4N+
to 5N5 purity with reference to Fe, Mg, AI, Cr, Zn, Bi and Cu. Removal of selenium is effected by hydrogen, which also serves
as carrier gas during zone refining. The selenium in tellurium matrix is found to be below detection limits. The zone temperature,
zone length and tilt angle maintained in the experiment are adequate to go down to high purity levels. 相似文献