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喲喲william木蟲 (小有名氣)
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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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carrieskl
木蟲 (著名寫手)
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2樓2013-04-22 16:48:35
喲喲william
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3樓2013-04-22 16:52:14
carrieskl
木蟲 (著名寫手)
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
愛與雨下: 金幣+1 2013-04-22 21:11:24
喲喲william: 金幣+10, 翻譯EPI+1, ★有幫助, 翻譯一半，給一半的金幣 2013-04-22 22:02:52
愛與雨下: 金幣+1 2013-04-22 21:11:24
喲喲william: 金幣+10, 翻譯EPI+1, ★有幫助, 翻譯一半，給一半的金幣 2013-04-22 22:02:52
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剛吃飯回來(lái)，翻了前兩段，跟你專業(yè)不一樣所以有的專業(yè)詞不知道譯的對(duì)不對(duì)。。 供參考—— 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↓ 通過(guò)原位硫沉淀途徑（應(yīng)該是個(gè)專業(yè)名詞吧，還是同位硫？）合成硫碳復(fù)合材料的工藝已經(jīng)在圖表1中闡釋了，原位硫在水溶液中的沉淀包含如下反應(yīng)：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硫代硫酸鈉通過(guò)攪拌完全溶解于750ml去離子水中。然后，把直徑30-60nm的0.1g導(dǎo)電炭黑加少量異丙醇，在超聲振動(dòng)下懸浮在上述液體中。 The reason for adding isopropyl alcohol is that it enhances the wetting of the hydrophobic carbon nanoparticles in the aqueous solution. 加異丙醇的原因是它可以提高疏水性納米碳在水溶液中的濕度（wetting是譯成濕度嗎？還是親水度？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鹽酸緩慢加入溶液，使之在表面上和納米碳黑之間沉淀出硫。 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. 在原位硫沉淀反應(yīng)中，硫原子長(zhǎng)到熱力學(xué)上穩(wěn)定的大小，復(fù)合材料中的納米碳自組裝，互相連接，最終包裹住硫。 After allowing the reaction mixture to stir for 24 h, the product was filtered and washed several times with DI water, ethanol, and acetone. 在把混合物攪拌24h后，過(guò)濾產(chǎn)物并分別用去離子水、乙醇和丙酮洗滌若干次。 The sulfur–carbon composite thus collected was dried in an air-oven at 50 ◦C for 24 h. 把上述收集的硫碳復(fù)合材料50攝氏度熱空氣干燥24h。 |
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喲喲william4樓2013-04-22 19:09:15
carrieskl
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5樓2013-04-22 19:15:05
喲喲william
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6樓2013-04-22 22:04:58
喲喲william
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7樓2013-04-22 22:06:47
菲菲婉兒
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★
喲喲william: 金幣+10, ★★★很有幫助, 謝謝 2013-04-24 16:33:24
喲喲william: 金幣+10, ★★★很有幫助, 謝謝 2013-04-24 16:33:24
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方案一闡釋了通過(guò)原位硫沉淀途徑形成的硫碳混合物的合成過(guò)程，而原位硫沉淀物在水溶液涉及以下反應(yīng)：Na2S2O3 +2HCl→2NaCl+SO2 +H2O+S↓ 首先，通過(guò)攪拌，將0.02摩爾的硫代硫酸鈉完全溶入750毫升的去離子水中。然后，加入少量異丙醇并在在超聲波振動(dòng)下，使0.1克、直徑為30-60毫米的商務(wù)導(dǎo)電碳黑（超級(jí)導(dǎo)電劑）懸浮于上述溶液中。加入異丙醇是為了提高斥水性納米碳在水溶液中的親水性。向溶液中緩慢加入2毫升鹽酸，使析出的硫浮出溶液或進(jìn)入碳黑納米材料。在原位硫沉淀反應(yīng)中，硫粒子增長(zhǎng)到對(duì)熱力學(xué)有利的規(guī)格，納米碳粒子自我聚集成的復(fù)合材料成為兩者之間的鏈接，最終，將硫包裹在內(nèi)。將反應(yīng)混合物攪拌24小時(shí)之后，將其過(guò)濾出來(lái)，并用去離子水、酒精、丙酮清洗數(shù)遍。收集硫碳化合物，用空氣烘焙機(jī)以50℃干燥24小時(shí)。 方案一闡釋了通過(guò)原位硫沉淀途徑形成的硫碳混合物的合成過(guò)程，而原位硫沉淀物在水溶液涉及以下反應(yīng)：Na2S2O3 +2HCl→2NaCl+SO2 +H2O+S↓ 首先，通過(guò)攪拌，將0.02摩爾的硫代硫酸鈉完全溶入750毫升的去離子水中。然后，加入少量異丙醇并在在超聲波振動(dòng)下，使0.1克、直徑為30-60毫米的商務(wù)導(dǎo)電碳黑（超級(jí)導(dǎo)電劑）懸浮于上述溶液中。加入異丙醇是為了提高斥水性納米碳在水溶液中的親水性。向溶液中緩慢加入2毫升鹽酸，使析出的硫浮出溶液或進(jìn)入碳黑納米材料。在原位硫沉淀反應(yīng)中，硫粒子增長(zhǎng)到對(duì)熱力學(xué)有利的規(guī)格，納米碳粒子自我聚集成的復(fù)合材料成為兩者之間的鏈接，最終，將硫包裹在內(nèi)。將反應(yīng)混合物攪拌24小時(shí)之后，將其過(guò)濾出來(lái)，并用去離子水、酒精、丙酮清洗數(shù)遍。收集硫碳化合物，用空氣烘焙機(jī)以50℃干燥24小時(shí)。 合成物中的硫含量在30-300℃流動(dòng)空氣中以每分鐘5℃加熱速度用鉑金埃爾默TGA7熱重量分析儀根據(jù)熱重量分析測(cè)量出來(lái)的. 在這個(gè)過(guò)程中，所有的硫都揮發(fā)了，硫含量可以通過(guò)重量減輕計(jì)算出來(lái)，因?yàn)樘己谠谶@個(gè)溫度范圍內(nèi)重量不改變。在碳硫混合物中，由重量分析數(shù)據(jù)確定的75%重量的硫被留用，作進(jìn)行進(jìn)一步實(shí)驗(yàn)。 王和一干人等利用了類似的溶液法反應(yīng)來(lái)制取硫，但是硫析出后，碳卻以另外一種混合方式吸附在了硫粒子表面。換句話說(shuō)，就是只有部分硫與導(dǎo)電碳有輕微接觸，導(dǎo)致活性物質(zhì)利用率很低。 相反，多虧了硫的異象成核，我們研究中使用的原位硫沉淀途徑確保了硫與碳黑的親密接觸。為了進(jìn)行對(duì)照，也用相同的反應(yīng)途徑合成了純凈的硫，只不過(guò)是在硫析出之后再加的碳黑。 |
8樓2013-04-22 23:53:30
菲菲婉兒
新蟲 (初入文壇)
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【答案】應(yīng)助回帖
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合成物中的硫含量在30-300℃流動(dòng)空氣中以每分鐘5℃加熱速度用鉑金埃爾默TGA7熱重量分析儀根據(jù)熱重量分析測(cè)量出來(lái)的. 在這個(gè)過(guò)程中，所有的硫都揮發(fā)了，硫含量可以通過(guò)重量減輕計(jì)算出來(lái)，因?yàn)樘己谠谶@個(gè)溫度范圍內(nèi)重量不改變。在碳硫混合物中，由重量分析數(shù)據(jù)確定的75%重量的硫被留用，作進(jìn)行進(jìn)一步實(shí)驗(yàn)。 王和一干人等利用了類似的溶液法反應(yīng)來(lái)制取硫，但是硫析出后，碳卻以另外一種混合方式吸附在了硫粒子表面。換句話說(shuō)，就是只有部分硫與導(dǎo)電碳有輕微接觸，導(dǎo)致活性物質(zhì)利用率很低。 相反，多虧了硫的異象成核，我們研究中使用的原位硫沉淀途徑確保了硫與碳黑的親密接觸。為了進(jìn)行對(duì)照，也用相同的反應(yīng)途徑合成了純凈的硫，只不過(guò)是在硫析出之后再加的碳黑. 不小心把一二段發(fā)了兩遍。。。。汗  |
9樓2013-04-22 23:56:53
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