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war3one金蟲 (著名寫手)
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[求助]
紅外處理翻譯
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最好私信給我謝謝！ 半纖維素組分的特征吸收峰為1735 cm-1，這一吸收峰反映了半纖維素中乙酰基團(tuán)C=O的變化。生物質(zhì)和第一次處理生物質(zhì)都有吸收峰，說明都有半纖維素的存在，但是第二次生物質(zhì)的吸收峰不明顯，表明了酸對半纖維素的去除作用。1429 cm-1 代表CH2 在結(jié)晶纖維素中的剪切振動，897 cm-1吸收峰反映了纖維素彎曲振動吸收峰，經(jīng)過預(yù)處理后，這兩個峰的吸收強(qiáng)度都有所增強(qiáng)，說明了纖維素含量的增加；其比值為OKI紅外結(jié)晶指數(shù)，計算結(jié)果表明第一次預(yù)處理后組分中纖維素結(jié)晶區(qū)的變化，由處理前的0.36 降為0.30，基本沒有變化，而經(jīng)過第二次預(yù)處理后其比值為0.1，與XRD 結(jié)晶指數(shù)的變化相吻合，雖然結(jié)晶度并沒有顯著降低，主要原因是纖維素總量的增加，所以非結(jié)晶區(qū)明顯增加。 |
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andrewzhang
鐵桿木蟲 (著名寫手)
超級無敵加菲
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【答案】應(yīng)助回帖
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war3one: 金幣+80, 翻譯EPI+1, ★★★★★最佳答案, 謝謝了 2013-08-14 08:57:46
war3one: 金幣+80, 翻譯EPI+1, ★★★★★最佳答案, 謝謝了 2013-08-14 08:57:46
| The absorption peak of hemicellulose is at 1735 cm-1, and this peak indicated the change of C=O group in hemicellulose. Both the raw biomaterial and the biomaterial obtained after the 1st pre-treatment had this peak, which pointed out the existence of hemicellulose. Whereas the peak after the 2nd pre-treatment was not obvious, which could be the effect that acid had removed the hemicellulose from the system. The absorption peak at 1429 cm-1 corresponds to the shearing vibration of CH2 in the crystallised cellulose, and peak at 897 cm-1 corresponds to the bending vibration of cellulose. After the pre-treatments, these two peaks were both enhanced, which indicated the increase in concentration of cellulose; and the ratio of this two strengths is OKI, infrared crystallographic index （這個翻得有問題，找找專業(yè)詞匯），its value could reflect the variation of crystallised zone in cellulose. After the 1st pre-treatment, this value decreased from 0.36 to 0.30, barely changed, but after the 2nd pre-treatment, it dropped directly to 0.1, which coincided well with the XRD results. It could be brought by the total amount of cellulose was increased, so even the crystallinity did not changed much, the quantity of non-crystallised zone raised. |
2樓2013-08-04 19:16:11
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