Difference between the magnetic properties of the magnetotactic bacteria and those of the extracted magnetosomes:: Influence of the distance between the chains of magnetosomes

被引：43

作者：

Alphandery, E. ^{[1
]}

Ngo, A. T. ^{[1
]}

Lefevre, C. ^{[2
]}

Lisiecki, I. ^{[1
]}

Wu, L. F. ^{[2
]}

Pileni, M. P. ^{[1
]}

机构：

[1] Univ Paris 06, Lab Mat Mesoscop & Nanometr LM2N, F-75252 Paris 05, France

[2] CNRS, IMSM, Chim Bacterienne Lab, F-13402 Marseille 20, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 32期

关键词：

D O I：

10.1021/jp800408t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report structural characterization and magnetic properties of various assemblies of chains of magnetosomes. The same magnetic properties are observed for the magnetotactic bacteria and for the extracted chains of magnetosomes isolated in a polymer. When the extracted chains of magnetosomes form a denser structure than that observed in the bacteria, the magnetic properties change markedly. A decrease in the coercivity and reduced remanence is observed. This behavior is attributed to an enhancement of the dipolar interactions between the chains of magnetosomes in the limit of a weakly interacting system; that is, the magnetostatic energy is lower than the anisotropy energy. The effect of the dipolar interactions is more pronounced at 250 K than at 10 K. This behavior is attributed to the existence of a family of small magnetosomes, which undergo a transition from a ferromagnetic to a superparamagnetic state.

引用

页码：12304 / 12309

页数：6

共 25 条

[11] Mesoscopic structures of nanocrystals: Collective magnetic properties due to the alignment of nanocrystals [J].

Lalatonne, Y ;

Motte, L ;

Russier, V ;

Ngo, AT ;

Bonville, P ;

Pileni, MP .

JOURNAL OF PHYSICAL CHEMISTRY B, 2004, 108 (06) :1848-1854

[12] Magnetostatic interactions in magnetic nanoparticle assemblies: energy, time and length scales [J].

Majetich, S. A. ;

Sachan, M. .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2006, 39 (21) :R407-R422

[13] Magnetic properties of gamma-Fe2O3 nanoparticles obtained by vaporization condensation in a solar furnace [J].

Martinez, B ;

Roig, A ;

Obradors, X ;

Molins, E ;

Rouanet, A ;

Monty, C .

JOURNAL OF APPLIED PHYSICS, 1996, 79 (05) :2580-2586

[14] Biotechnological application of nano-scale engineered bacterial magnetic particles [J].

Matsunaga, T ;

Okamura, Y ;

Tanaka, T .

JOURNAL OF MATERIALS CHEMISTRY, 2004, 14 (14) :2099-2105

[15] Genes and proteins involved in bacterial magnetic particle formation [J].

Matsunaga, T ;

Okamura, Y .

TRENDS IN MICROBIOLOGY, 2003, 11 (11) :536-541

[16] ROCK MAGNETIC CRITERIA FOR THE DETECTION OF BIOGENIC MAGNETITE [J].

MOSKOWITZ, BM ;

FRANKEL, RB ;

BAZYLINSKI, DA .

EARTH AND PLANETARY SCIENCE LETTERS, 1993, 120 (3-4) :283-300

[17] MAGNETOCRYSTALLINE ANISOTROPY OF MAGNETITE AT LOW TEMPERATURE [J].

PALMER, W .

PHYSICAL REVIEW, 1963, 131 (03) :1057-&

[18] Magnetic colloids from magnetotactic bacteria: Chain formation and colloidal stability [J].

Philipse, AP ;

Maas, D .

LANGMUIR, 2002, 18 (25) :9977-9984

[19] An acidic protein aligns magnetosomes along a filamentous structure in magnetotactic bacteria [J].

Scheffel, A ;

Gruska, M ;

Faivre, D ;

Linaroudis, A ;

Plitzko, JM ;

Schüler, D .

NATURE, 2006, 440 (7080) :110-114

[20]

Schueler Dirk, 1999, Journal of Molecular Microbiology and Biotechnology, V1, P79

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