scholarly journals Magnetic Nanoparticle Chains in Gelatin Ferrogels: Bioinspiration from Magnetotactic Bacteria

2019 ◽  
Vol 29 (45) ◽  
pp. 1905996 ◽  
Author(s):  
Sebastian Sturm ◽  
Maria Siglreitmeier ◽  
Daniel Wolf ◽  
Karin Vogel ◽  
Micha Gratz ◽  
...  
Keyword(s):  
Magnetic Nanoparticle ◽  
Magnetotactic Bacteria ◽  
Nanoparticle Chains

BIREFRINGENCE AND MAGNETO-OPTICAL PROPERTIES IN OLEIC ACID COATED Fe3O4 NANOPARTICLES: APPLICATION FOR OPTICAL SWITCH

2011 ◽  
Vol 10 (03) ◽  
pp. 515-520 ◽  
Author(s):  
SI-HUA XIA ◽  
JUN WANG ◽  
ZHANG-XIAN LU ◽  
FEIYAN ZHANG
Keyword(s):  
Magnetic Field ◽  
Optical Properties ◽  
Oleic Acid ◽  
Magnetic Nanoparticles ◽  
Magnetic Nanoparticle ◽  
Optical Switch ◽  
Colloidal Suspension ◽  
Experimental Parameters ◽  
Nanoparticle Chains ◽  
The Magnetic Field

We report magneto-optical properties in a kerosene colloidal suspension of oleic acid coated Fe3O4 nanoparticles (~14 nm). The magnetic colloids (fluids) show birefringence under a magnetic field. Systematical studies of the on–off switch times upon application of the on–off magnetic field with varied experimental parameters indicate that the switch response time depends strongly on the strength of the magnetic field and the concentration of the magnetic nanoparticles in the fluid. The data can be explained in terms of the formation of magnetic nanoparticle chains under a magnetic field. The important magneto-optical properties of the magnetic fluids allow us to design a tunable optical switch.

Fe3O4 nanoparticle chains with N-doped carbon coating: magnetotactic bacteria assisted synthesis and high-rate lithium storage

RSC Advances ◽  
2013 ◽  
Vol 3 (35) ◽  
pp. 14960 ◽  
Author(s):  
Dan Yang ◽  
Yanping Zhou ◽  
Xianhong Rui ◽  
Jixin Zhu ◽  
Ziyang Lu ◽  
...  
Keyword(s):  
Carbon Coating ◽  
Magnetotactic Bacteria ◽  
High Rate ◽  
Fe3o4 Nanoparticle ◽  
Lithium Storage ◽  
Nanoparticle Chains

scholarly journals Magnetic flux closure in mutant magnetotactic bacteria elucidates a key signature of magnetofossils

2021 ◽  
Author(s):  
Matthieu Amor ◽  
Juan Wan ◽  
Ramon Egli ◽  
Julie Carlut ◽  
Christiphe Gatel ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Sedimentary Rocks ◽  
Magnetotactic Bacteria ◽  
Geological Samples ◽  
Time Resolved ◽  
Microbial Life ◽  
Magnetic Components ◽  
Phylogenetic Implications ◽  
Magnetic Signatures ◽  
Nanoparticle Chains

Abstract Magnetotactic bacteria (MTB) produce single- or multi-stranded chains of magnetic nanoparticles that contribute to the magnetization of sedimentary rocks. Their magnetic fingerprint can be detected in ancient geological samples, and serve as a unique biosignature of microbial life. However, fossilized assemblages bear contradictory signatures pointing to magnetic components that have distinct origin(s). Here, we produce mutant bacteria to mimic MTB producing multi-stranded chains that cannot be cultivated in the laboratory, and show that the unresolved magnetic signatures are fully compatible with the contribution of MTB synthesizing multi-stranded nanoparticle chains and with fold-collapsed single-stranded chains. These structures generate magnetic flux-closing configurations while maintaining high remanent magnetizations. This work has important paleoclimatic, paleontological and phylogenetic implications, as it provides a novel tool to differentiate distinct MTB lineages (single- vs multi-stranded nanoparticle chains) which will enable the tracking of the evolution of some of the most ancient biomineralizing organisms in a time-resolved manner.

Facile Assembly of Aligned Magnetic Nanoparticle Chains in Polymer Nanocomposite Films by Magnetic Flow Coating

2017 ◽  
Vol 9 (12) ◽  
pp. 11290-11298 ◽  
Author(s):  
Hongyi Yuan ◽  
Irina J. Zvonkina ◽  
Abdullah M. Al-Enizi ◽  
Ahmed A. Elzatahry ◽  
Jeffrey Pyun ◽  
...  
Keyword(s):  
Magnetic Nanoparticle ◽  
Polymer Nanocomposite ◽  
Nanocomposite Films ◽  
Magnetic Flow ◽  
Nanoparticle Chains
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