共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
聚吡咯的合成与新型双离子电池性能研究 总被引:10,自引:0,他引:10
用反相微乳聚合法制备了十二苯磺酸(DBSA)掺杂的导电聚吡咯纳米材料, DBSA既作为表面活性剂又作为掺杂剂, 能够提高聚吡咯的导电性. 用制备出的DBSA-PPy 为正极材料, 石墨为负极材料组装双离子电池, 测试结果表明, C/DBSA-PPy 电池的电化学性能已达到传统锂离子电池的水平, 这是因其具有较高的导电性和特殊掺杂结构的聚吡咯使其电化学性能得到优化. 相似文献
4.
New X-ray methods have been developed for the determination of as little as 1 μg of fluorine or as little as 0.1 μg of sulfur. Fluorine as fluoride is precipitated as lanthanum fluoride in 75% ethanol-water mixture and determined by measuring the amount of lanthanum present in the precipitate. Sulfur as sulfate is precipitated as barium sulfate from a barium sulfate saturated 50% ethanol-buffer mixture, using selenate as a coprecipitant, and determined by measuring the amount of sulfur present. Sulfur as sulfide is precipitated as cadmium sulfide and determined by measuring the amount of sulfur or cadmium in the precipitate. 相似文献
5.
本文考察了不同制备方法、不同种类的光敏剂对以苯并三氮唑银为银源的光敏热成像材料感光性能的影响。结果显示原位法中以AgI和AgBrI为光敏剂的PTG材料具有较高的感光度,分别为以AgBr为光敏剂的参比样片感光度的16倍和2.4倍;异位法制备的PTG材料中,以AgBrI乳剂为光敏剂的感光度比以AgBr为光敏剂的感光度高,是其3倍;此外,同是以AgBr为光敏剂、用异位法制备的PTG材料的感光度比原位法制备的PTG材料感光度高。文中初步分析讨论了出现以上实验结果的原因。 相似文献
6.
7.
8.
Janusz Trawczyski 《Reaction Kinetics and Catalysis Letters》2000,69(2):293-298
Catalytic activities of sulfided and nitrided forms of alumina supported molybdenum as well as cobalt-molybdenum catalysts were compared in the reactions of hydrodesulfurization of dibenzothiophene and hydrodenitrogenation of quinoline. Effect of catalyst composition as well as of the method of its activation on the reaction pathways and catalyst selectivity is discussed. 相似文献
9.
Smelaya Z. V. Matkovskaya L. A. Goltsov Yu. G. 《Journal of Thermal Analysis and Calorimetry》2000,62(2):443-450
Supramolecular structures of lecithin occurred to be the template in the synthesis of mesoporous aluminosilicates; using of various combinations of lecithin and cetyltrimethyl-ammonium bromide or octadecylamine as templating agents allowed to obtain mesoporous substances with pores up to 100 Å, as well as biporous materials in aluminosilicate system. In the presence of glucose oxidase and cetyltrimethyl-ammonium bromide combinations aluminosilicate substances with complex porous structure were shown to be formed (pore size distributions exhibited 3 peaks, corresponding 3 effective size of mesopores in the 30–100 Å range). The investigation of sorption of glucose oxidase on obtained aluminosilicate mesoporous substances was carried out, the results obtained allowus to consider such materials as prospect for creation high capable and selective sorbents for biomolecules sorption, as well as active elements of chemical and biosensors. 相似文献
10.
An experimental technique based on a modified vibrating orifice aerosol generator has been employed to study unsteady evaporation of linear streams of highly monodisperse binary microdroplets of volatile constituents over short time periods (i.e., <1 ms), such that the droplet composition remains nearly constant. The droplet size and temperature (i.e., refractive index) have been determined with high temporal resolution from the resonances observed in the simultaneous elastic and Raman light scattering spectra obtained by varying the droplet size through modulation of droplet generation frequency. By using this technique we show that thermodynamic parameters of binary systems, such as activity coefficients as well as vapor pressures of the constituents as functions of temperature, can be determined. We have applied the procedure to study unsteady evaporation rates of pure ethanol and methanol droplets as well as binary droplets containing various ratios of ethanol and methanol. We have obtained vapor pressures of ethanol and methanol as functions of temperature as well as activity coefficients of ethanol and methanol as functions of composition, and the results show excellent agreements with the values reported in the literature. The technique presented in this paper is applicable to any binary system containing at least one volatile constituent. Copyright 2000 Academic Press. 相似文献
11.
Catalyst loading as low as 0.1 mol % was achieved in the enantioselective Strecker reaction of ketoimines. Excellent enantioselectivity was obtained with a combined use of a catalytic amount of TMSCN and a stoichiometric amount of HCN as a reagent, and a chiral gadolinium complex as a catalyst. 相似文献
12.
13.
《Electroanalysis》2006,18(2):131-140
Reduction of carbonyl group in aldehydes and ketones, as well as oxidation of numerous aldehydes is discussed, as well as those reductions of organic compounds where the C?O group activates cleavage of an adjacent C? X bond where X is a good leaving group like halogen, OH, NH2 or SR or activates hydrogenation of an adjacent C?C group. Survey involves aliphatic and aromatic aldehydes, aryl alkyl and diaryl ketones, as well as α‐ketoacids, 1,2‐diketones and compounds where the carbonyl group is a part of a ring. The role of acid–base, hydration–dehydration and in some cases keto–enol equilibria on electrochemical behavior is pointed out, as well as the role of buffer kind and concentration and the nature of the cation of supporting electrolyte. Better understanding of these factors promises finding of best conditions for electroanalytical procedures. 相似文献
14.
光照对高铁酸盐溶液稳定性的影响 总被引:7,自引:0,他引:7
The effects of light wave on the stability of fen'ate solution have been examined. The results showed that UV-light accelerates the decomposition of ferrate with decomposition rate 1.6 times as much as that in dark whereas infrared light has only unclear effect on the stability of ferrate, with decomposition rate 1.1 times as much as in dark. The polythene container is found to the best for preservation of ferrate solution in dark. 相似文献
15.
醋酸和丙三醇对制备SrTiO3的影响 总被引:5,自引:0,他引:5
醋酸和丙三醇对制备SrTiO_3的影响颜秀茹,霍明亮,王建萍,王菲,曾淑兰(天津大学化学系天津300072)关键词 冰醋酸,溶胶-凝胶过程,丙三醇,SrTiO_3SrTiO3是电子材料中使用最广的材料之一,有关它的制备已有不少报道。一般可以通过SrCO... 相似文献
16.
17.
碳纳米管微结构的改变对其容量性能的影响 总被引:9,自引:0,他引:9
以KOH为活性剂,通过在高温下将碳纳米管进行活化处理来实现对碳纳米管管壁结构的改变,得到了比表面积和孔容分别是活化处理前约3倍和1.5倍的活性碳纳米管.将活化处理前后两种碳纳米管分别制作成电化学超级电容器电极,在充满氩气的无水手套箱组装成模拟电化学超级电容器,在恒流充放电模式下进行电化学可逆容量的测试,发现活性碳纳米管的电化学容量远高于活化前碳纳米管,是它的2倍.从而发现碳纳米管被打断,管壁变粗糙的活性碳纳米管比一般碳纳米管更适合用于电化学超级电容器电极材料. 相似文献
18.
以丙烯酸、丙烯酸丁酯和甲基丙烯酸甲酯为单体,采用自由基聚合法制备了聚丙烯酸卷材涂料前驱成膜物,获得了适宜的制备工艺条件。研究表明,以三元共聚体系聚合产物为根本,以氨基树脂为交联剂,三乙胺为中和剂,可制备令人满意的水溶性聚丙烯酸卷材涂料前驱成膜物,为开发水溶性聚丙烯酸卷材涂料提供了基础数据。 相似文献
19.
WU Ren-Ping YU Yan GU Ying Yun GUO Jin-Yu 《结构化学》2007,26(5):562-566
Deep color glass-ceramics is prepared by using gold tailings as the main raw material, and Cr2O3 is added as nucleation agent. Influence of different Cr2O3 additions on crystallization structure and properties of CaO-MgO-Al2O3-SiO2 glass-ceramics has been discussed so as to select optimum additions. DTA is employed to determine optimum crystallization and nucleation temperatures; XRD and SEM are used to characterize microstructure of each sample; and performance indexes, such as water absorption, bulk density, flexural strength and so on, are also determined. Experimental results show that when 3wt% Cr2O3 is introduced, fine glass-ceramics with diopside as the main crystal and Ca-Fe diopside as the second-crystal is obtained, and its corresponding performance indexes are as follows: water absorption 0.12%, bulk density 2.56 g/cm3, and flexural strength 70.01 Mpa. 相似文献
20.
Gwi-Taek Jeong Don-Hee Park Choon-Hyoung Kang Woo-Tai Lee Chang-Shin Sunwoo Chung-Han Yoon Byung-Chul Choi Hae-Sung Kim Si-Wouk Kim Un-Taek Lee 《Applied biochemistry and biotechnology》2004,114(1-3):747-758
Fatty acid methyl esters (FAMEs) show large potential applications as diesel substitutes, also known as biodiesel fuel. Biodiesel
fuel as renewable energy is an alternative that can reduce energy dependence on petroleum as well as air pollution. Several
processes for the production of biodiesel fuel have been developed. Transesterification processes under alkali catalysis with
short-chain alcohols give high yields of methyl esters in short reaction times. We investigated transesterification of rapeseed
oil to produce the FAMEs. Experimental reaction conditions were molar ratio of oil to alcohol, concentration of catalyst,
type of catalyst, reaction time, and temperature. The conversion ratio of rapeseed oil was enhanced by the alcohol:oil mixing
ratio and the reaction temperature. 相似文献