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Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite
Zhang,Tongwei1,2; Pan,Yongxin1,2,3
2018-12-24
发表期刊Earth, Planets and Space
ISSN1880-5981
卷号70期号:1
摘要AbstractFour samples containing ultrafine- and fine-grained magnetite of magnetoferritins and magnetotactic bacteria cells were magnetically characterized at both room and low temperatures. Transmission electron microscopy analysis showed that the biometrically synthesized magnetoferritins (M-HFn) have magnetite cores with a mean size of 5.3?±?1.2?nm inside protein shells, while Magnetospirillum gryphiswaldense MSR-1 cell produced intracellular magnetosome magnetites have a mean size of 29.6?±?7.6?nm, arranged in a single chain. A pure M-HFn sample (M1), MSR-1 whole cell sample (M4) and two samples (M2, M3) mixing M-HFn with MSR-1 whole cells in different weight percentages were measured, including hysteresis, temperature dependency of magnetization and remanence and frequency dependence of AC susceptibility at low temperature. At room temperature, the ultrafine-grained magnetite core of M-HFn of M1 sample has a typical superparamagnetic (SP) behavior. The chain-arranged magnetosome magnetite of MSR-1 cells of M4 sample shows a stable single-domain (SD) state. At low temperature, the M2 sample with?~?16?wt% SD magnetosome magnetite and the M3 sample with?~?43?wt% SD magnetosome magnetite behave somewhat similar to the M1 (pure M-HFn), due to the SP component from M-HFn magnetite. With the dominance of SP magnetite in samples M1, M2, and M3, the coercivity and saturation remanence decrease significantly as temperature increasing from 5 to 20?K. Of note, the magnetization and frequency dependence of AC susceptibility at low temperature are sensitive to SP magnetites in measured samples. The magnetosome magnetite produced by MSR-1 has a Verwey transition temperature at around 100?K, which is consistent with previous observations on magnetotactic bacteria. This study provides useful clues for identification of SP and SD magnetite in sediments, as well as related potential biomedical and biomagnetic applications.
关键词Superparamagnetism (SP) Magnetoferritins Magnetosome magnetite Low-temperature measurements Biogenic magnetite
DOI10.1186/s40623-018-0978-2
语种英语
WOS记录号BMC:10.1186/s40623-018-0978-2
出版者Springer Berlin Heidelberg
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/89469
专题地球与行星物理院重点实验室
通讯作者Pan,Yongxin
作者单位1.
2.
3.
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Zhang,Tongwei,Pan,Yongxin. Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite[J]. Earth, Planets and Space,2018,70(1).
APA Zhang,Tongwei,&Pan,Yongxin.(2018).Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite.Earth, Planets and Space,70(1).
MLA Zhang,Tongwei,et al."Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite".Earth, Planets and Space 70.1(2018).
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