Quantitative NMR investigation on the low-temperature dissolution mechanism of chitin in NaOH/urea aqueous solution
文献类型：期刊论文
| 作者 | Ru, Geying1; Luo, Huan1; Liang, Xinmiao1,2; Wang, Liying1; Liu, Chaoyang1; Feng, Jiwen1 |
| 刊名 | CELLULOSE
 |
| 出版日期 | 2015-08-01 |
| 卷号 | 22期号:4页码:2221-2229 |
| 关键词 | Chitin NaOH/urea aqueous solution Low temperature dissolution Mechanism NMR |
| 英文摘要 | The low-temperature dissolution mechanism of chitin in NaOH/urea aqueous solution has not been well established yet, especially at a temperature that lowers the crystallization temperature of both NaOH and urea. Using multiple nuclei (H-1, N-15 and Na-23) nuclear magnetic resonance (NMR) methods, we find that the ternary NaOH/urea/D2O system, different from the fully frozen binary NaOH-D2O system, exhibits solid-liquid phase coexistence below -40 degrees C, and the residual liquid phase consists of certain concentrations of NaOH (10 wt%), urea (13 wt%) and D2O at -40 degrees C. Our NMR results further demonstrate that chitin dissolves in the residual liquid phase (containing 5-10 wt% NaOH and 8-12 wt% urea) at low temperatures (-40 and -70 degrees C). An important role of urea is enhancing the low-temperature stability of NaOH aqueous solutions and then increasing the dissolution temperature range of chitin, thus providing an essential low-temperature liquid environment for chitin dissolution. |
| WOS标题词 | Science & Technology ; Technology ; Physical Sciences |
| 类目[WOS] | Materials Science, Paper & Wood ; Materials Science, Textiles ; Polymer Science |
| 研究领域[WOS] | Materials Science ; Polymer Science |
| 关键词[WOS] | SOLID-STATE NMR ; CELLULOSE ; UREA ; COMPLEXES ; HYDROXIDE ; BEHAVIOR ; SYSTEM |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000361003100007 |
| 公开日期 | 2015-11-02 |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/8157]  |
| 专题 | 武汉物理与数学研究所_磁共振基础研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Ctr Magnet Resonance Wuhan, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan Inst Phys & Math, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ru, Geying,Luo, Huan,Liang, Xinmiao,et al. Quantitative NMR investigation on the low-temperature dissolution mechanism of chitin in NaOH/urea aqueous solution[J]. CELLULOSE,2015,22(4):2221-2229. |
| APA | Ru, Geying,Luo, Huan,Liang, Xinmiao,Wang, Liying,Liu, Chaoyang,&Feng, Jiwen.(2015).Quantitative NMR investigation on the low-temperature dissolution mechanism of chitin in NaOH/urea aqueous solution.CELLULOSE,22(4),2221-2229. |
| MLA | Ru, Geying,et al."Quantitative NMR investigation on the low-temperature dissolution mechanism of chitin in NaOH/urea aqueous solution".CELLULOSE 22.4(2015):2221-2229. |
入库方式： OAI收割
来源：武汉物理与数学研究所
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