Effects of organic matter on thermal stability of nanometer-sized magnetite
文献类型：期刊论文
| 作者 | Wu Wen-Fang1,2,3; Li Jin-Hua1,3; Zhang Chun-Xia4; Pan Yong-Xin1,3 |
| 刊名 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
 |
| 出版日期 | 2010-10-01 |
| 卷号 | 53期号:10页码:2427-2434 |
| 关键词 | Organic matter Magnetosome magnetite Thermal stability |
| ISSN号 | 0001-5733 |
| DOI | 10.3969/j.issn.0001-5733.2010.10.016 |
| 文献子类 | Article |
| 英文摘要 | Single domain (SD) magnetite particles are significant magnetic carriers in geologic samples. However, its stability remains a major concern due to their fine-grain sizes. To probe the effects of organic matter on thermal stability of magnetite nanoparticles, we comparatively studied the thermo-magnetic properties, hysteresis parameters and low-temperature magnetic behaviors of isolated magnetosome magnetites of Magnetospirillum magneticum AMB-1 and whole cell samples. The isolated SD magnetosome magentites with few amount of organic matter showed extremely good thermal stability, while the SD magnetites in whole cells changed strikingly during thermal treatment. The latter began to convert by similar to 270 degrees C, and were almost entirely reduced to paramagnetic substance by 400 degrees C. The coercivity (B(c)), remanent coercivity (B(cr)) and the ratio of saturation remanence to saturation magnetization (M(rs)/M(s)) decreased, while the ratio of remanence coercivity to coercivity (B(cr)/B(c)) increased when heating up to 400 degrees C, owing to the reduction and decomposition of organic matter in whole cell. Our results indicated that SD magnetite in geologic samples carrying substantial organic matter can be hardly preserved if the samples were once heated to 300 degrees C similar to 400 degrees C. |
| WOS关键词 | MAGNETOTACTIC BACTERIA ; LOESS PLATEAU ; SUSCEPTIBILITY ; MAGNETOSOMES ; AMB-1 ; ROCKS ; IRON |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000283754800016 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/72614]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Wu Wen-Fang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earths Deep Interior, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Franco Chinese Biomineralizat & Nanostruct Lab, Beijing 100029, Peoples R China 4.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu Wen-Fang,Li Jin-Hua,Zhang Chun-Xia,et al. Effects of organic matter on thermal stability of nanometer-sized magnetite[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2010,53(10):2427-2434. |
| APA | Wu Wen-Fang,Li Jin-Hua,Zhang Chun-Xia,&Pan Yong-Xin.(2010).Effects of organic matter on thermal stability of nanometer-sized magnetite.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,53(10),2427-2434. |
| MLA | Wu Wen-Fang,et al."Effects of organic matter on thermal stability of nanometer-sized magnetite".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 53.10(2010):2427-2434. |
入库方式： OAI收割
来源：地质与地球物理研究所
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