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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页码:13
摘要Four 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 +/- 1.2nm inside protein shells, while Magnetospirillum gryphiswaldense MSR-1 cell produced intracellular magnetosome magnetites have a mean size of 29.6 +/- 7.6nm, arranged in a single chain. A pure M-HFn sample (M-1), MSR-1 whole cell sample (M-4) and two samples (M-2, M-3) 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 M-1 sample has a typical superparamagnetic (SP) behavior. The chain-arranged magnetosome magnetite of MSR-1 cells of M-4 sample shows a stable single-domain (SD) state. At low temperature, the M-2 sample with 16wt% SD magnetosome magnetite and the M-3 sample with 43wt% SD magnetosome magnetite behave somewhat similar to the M-1 (pure M-HFn), due to the SP component from M-HFn magnetite. With the dominance of SP magnetite in samples M-1, M-2, and M-3, the coercivity and saturation remanence decrease significantly as temperature increasing from 5 to 20K. 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 100K, 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
资助者Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC ; Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC ; Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC ; Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC
关键词[WOS]MAGNETOTACTIC BACTERIA ; PHYSICOCHEMICAL CHARACTERISTICS ; RELATIVE PALEOINTENSITY ; FERROMAGNETIC-RESONANCE ; EQUATORIAL PACIFIC ; SUPERPARAMAGNETISM ; SEDIMENTS ; NANOPARTICLES ; BIOMINERALIZATION ; MAGNETOSOME
语种英语
资助项目Frontier Science Key Project of CAS ; NSFC[41621004]
资助者Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC ; Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC ; Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC ; Frontier Science Key Project of CAS ; Frontier Science Key Project of CAS ; NSFC ; NSFC
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000454246900001
出版者SPRINGEROPEN
引用统计
文献类型期刊论文
条目标识符http://ir.iggcas.ac.cn/handle/132A11/90246
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.Chinese Acad Sci, Inst Earth Sci, Inst Geol & Geophys, Biogeomagnetism Grp,Key Lab Earth & Planetary Phy, Beijing, Peoples R China
2.Chinese Acad Sci, Evolut & Dev Magnetotact Multicellular Organisms, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
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GB/T 7714
Zhang, Tongwei,Pan, Yongxin. Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite[J]. EARTH PLANETS AND SPACE,2018,70:13.
APA Zhang, Tongwei,&Pan, Yongxin.(2018).Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite.EARTH PLANETS AND SPACE,70,13.
MLA Zhang, Tongwei,et al."Constraining the magnetic properties of ultrafine- and fine-grained biogenic magnetite".EARTH PLANETS AND SPACE 70(2018):13.
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