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哟哟william木虫 (小有名气)
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[求助]
急求，一段英文文献翻译。
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The synthesis process for the sulfur–carbon composite by the in situ sulfur deposition route is illustrated in Scheme 1, and the in situ sulfur deposition in aqueous solution involves the following reaction: Na2S2O3 +2HCl→2NaCl+SO2 +H2O+S↓ First, 0.02 mole of sodium thiosulfate (Na2S2O3, Fisher scientific) was completely dissolved in 750 mL of deionized (DI) water by stirring. Then, 0.1 g of commercial conductive carbon black with a diameter of 30–60 nm (Super P) was suspended in the above solution by adding a small amount of isopropyl alcohol (C3H8O, Fisher scientific) under ultrasonic vibrations. The reason for adding isopropyl alcohol is that it enhances the wetting of the hydrophobic carbon nanoparticles in the aqueous solution. A 2 mL of hydrochloric acid (HCl, Fisher Scientific) was then slowly added to the solution to precipitate the sulfur onto the surface and into the interspaces of the nano-sized carbon black. During the in situ sulfur deposition reaction, the sulfur particles grow to a thermodynamically favored size and the carbon nanoparticles in the composite self-assemble, become interconnected with each other, and finally wrap the sulfur. After allowing the reaction mixture to stir for 24 h, the product was filtered and washed several times with DI water, ethanol, and acetone. The sulfur–carbon composite thus collected was dried in an air-oven at 50 ◦C for 24 h. The sulfur content in the composite was determined by thermogravimetric analysis (TGA) with a Perkin-Elmer TGA 7 Thermogravimetric Analyzer at a heating rate of 5 ◦C/min from 30 to 300 ◦C with flowing air. During this process, all the sulfur volatilizes and the sulfur content could be obtained from the observed weight loss since carbon black does not exhibit any weight loss in this temperature range. The sulfur–carbon composites with 75 wt.% sulfur as confirmed by the TGA data were employed for further experiments. Wang et al. [22] used a similar solution-based reaction to obtain sulfur, but the carbon was attached to the surface of the sulfur particles by an extra mixing process after the precipitation of sulfur. In other words, only part of the sulfur was slightly connected with the conductive carbon, resulting in a low utilization of the active material. In contrast, the in situ sulfur deposition route used in our study ensures that sulfur contacts with the carbon black closely due to the heterogeneous nucleation of sulfur. In order to have a comparison, pure sulfur was also synthesized by the same reaction route, but carbon black was added after sulfur was precipitated. |
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【答案】应助回帖
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合成物中的硫含量在30-300℃流动空气中以每分钟5℃加热速度用铂金埃尔默TGA7热重量分析仪根据热重量分析测量出来的. 在这个过程中，所有的硫都挥发了，硫含量可以通过重量减轻计算出来，因为碳黑在这个温度范围内重量不改变。在碳硫混合物中，由重量分析数据确定的75%重量的硫被留用，作进行进一步实验。 王和一干人等利用了类似的溶液法反应来制取硫，但是硫析出后，碳却以另外一种混合方式吸附在了硫粒子表面。换句话说，就是只有部分硫与导电碳有轻微接触，导致活性物质利用率很低。 相反，多亏了硫的异象成核，我们研究中使用的原位硫沉淀途径确保了硫与碳黑的亲密接触。为了进行对照，也用相同的反应途径合成了纯净的硫，只不过是在硫析出之后再加的碳黑. 不小心把一二段发了两遍。。。。汗  |
9楼2013-04-22 23:56:53
carrieskl
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2楼2013-04-22 16:48:35
哟哟william
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3楼2013-04-22 16:52:14
carrieskl
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【答案】应助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
爱与雨下: 金币+1 2013-04-22 21:11:24
哟哟william: 金币+10, 翻译EPI+1, ★有帮助, 翻译一半，给一半的金币 2013-04-22 22:02:52
爱与雨下: 金币+1 2013-04-22 21:11:24
哟哟william: 金币+10, 翻译EPI+1, ★有帮助, 翻译一半，给一半的金币 2013-04-22 22:02:52
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刚吃饭回来，翻了前两段，跟你专业不一样所以有的专业词不知道译的对不对。。 供参考—— The synthesis process for the sulfur–carbon composite by the in situ sulfur deposition route is illustrated in Scheme 1, and the in situ sulfur deposition in aqueous solution involves the following reaction: Na2S2O3 +2HCl→2NaCl+SO2 +H2O+S↓ 通过原位硫沉淀途径（应该是个专业名词吧，还是同位硫？）合成硫碳复合材料的工艺已经在图表1中阐释了，原位硫在水溶液中的沉淀包含如下反应：Na2S2O3 +2HCl→2NaCl+SO2 +H2O+S↓ First, 0.02 mole of sodium thiosulfate (Na2S2O3, Fisher scientific) was completely dissolved in 750 mL of deionized (DI) water by stirring. Then, 0.1 g of commercial conductive carbon black with a diameter of 30–60 nm (Super P) was suspended in the above solution by adding a small amount of isopropyl alcohol (C3H8O, Fisher scientific) under ultrasonic vibrations. 首先，0.02mole硫代硫酸钠通过搅拌完全溶解于750ml去离子水中。然后，把直径30-60nm的0.1g导电炭黑加少量异丙醇，在超声振动下悬浮在上述液体中。 The reason for adding isopropyl alcohol is that it enhances the wetting of the hydrophobic carbon nanoparticles in the aqueous solution. 加异丙醇的原因是它可以提高疏水性纳米碳在水溶液中的湿度（wetting是译成湿度吗？还是亲水度？溶水性？）。 A 2 mL of hydrochloric acid (HCl, Fisher Scientific) was then slowly added to the solution to precipitate the sulfur onto the surface and into the interspaces of the nano-sized carbon black. 把2ml盐酸缓慢加入溶液，使之在表面上和纳米碳黑之间沉淀出硫。 During the in situ sulfur deposition reaction, the sulfur particles grow to a thermodynamically favored size and the carbon nanoparticles in the composite self-assemble, become interconnected with each other, and finally wrap the sulfur. 在原位硫沉淀反应中，硫原子长到热力学上稳定的大小，复合材料中的纳米碳自组装，互相连接，最终包裹住硫。 After allowing the reaction mixture to stir for 24 h, the product was filtered and washed several times with DI water, ethanol, and acetone. 在把混合物搅拌24h后，过滤产物并分别用去离子水、乙醇和丙酮洗涤若干次。 The sulfur–carbon composite thus collected was dried in an air-oven at 50 ◦C for 24 h. 把上述收集的硫碳复合材料50摄氏度热空气干燥24h。 |
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哟哟william4楼2013-04-22 19:09:15
