نتایج جستجو برای: magnetite nanoparticle

تعداد نتایج: 35851  

Journal: :PLoS ONE 2008
Richard A. Holland Joseph L. Kirschvink Thomas G. Doak Martin Wikelski

While the role of magnetic cues for compass orientation has been confirmed in numerous animals, the mechanism of detection is still debated. Two hypotheses have been proposed, one based on a light dependent mechanism, apparently used by birds and another based on a "compass organelle" containing the iron oxide particles magnetite (Fe(3)O(4)). Bats have recently been shown to use magnetic cues f...

2013
Siang Yee Yeo Siwon Choi Vivian Dien Yoke Keow Sow-Peh Genggeng Qi T. Alan Hatton Patrick S. Doyle Beng Joo Reginald Thio

We report the use of a simple yet highly effective magnetite-waste tea composite to remove lead(II) (Pb(2+)) ions from water. Magnetite-waste tea composites were dispersed in four different types of water-deionized (DI), artificial rainwater, artificial groundwater and artificial freshwater-that mimic actual environmental conditions. The water samples had varying initial concentrations (0.16-5....

Journal: :ChemNanoMat 2021

Magnetic chains are of fundamental and technological interest. However, 1D assemblies magnetic nanoparticles only metastable such that their controlled organization requires the use templates. Bacteriophages human-inoffensive viruses with a filamentous morphology have been shown to exhibit great potential in materials research. Here, we thus utilized M13 phage as model for formation actuated ma...

2017
Ravi K. Kukkadapu John M. Zachara James K. Fredrickson David W. Kennedy Alice C. Dohnalkova David E. Mccready

An ~1:1 mixture of ferrihydrite and nanocrystalline akaganeite (β-FeOOH; 10–15 nm) was incubated with Shewanella putrefaciens (strain CN32) under anoxic conditions with lactate as an electron donor and anthraquinone-2,6-disulfonate (AQDS) as an electron shuttle. The incubation was carried out in a 1,4-piperazinediethanesulfonic acid (PIPES)-buffered medium, without PO4 at circumneutral pH. Iron...

Journal: :Applied Physics Letters 2021

Plasmonic nanopores are extensively investigated as single molecules detectors. The main limitations in plasmonic nanopore technology the too fast translocation velocity of molecule through pore and consequent very short analysis times, well possible instabilities due to local heating. most interesting approach control enable longer acquisition times is represented by ability efficiently trap t...

Journal: :Geochemical transactions 2016
Amanda H Meena Yuji Arai

BACKGROUND Reductive precipitation of hexavalent chromium (Cr(VI)) with magnetite is a well-known Cr(VI) remediation method to improve water quality. The rapid (<a few hr) reduction of soluble Cr(VI) to insoluble Cr(III) species by Fe(II) in magnetite has been the primary focus of the Cr(VI) removal process in the past. However, the contribution of simultaneous Cr(VI) adsorption processes in ag...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2004
Arash Komeili Hojatollah Vali Terrance J Beveridge Dianne K Newman

Bacterial magnetosomes are intracellular compartments that house highly ordered magnetite crystals. By using Magnetospirillum sp. AMB-1 as a model system, we show that magnetosome vesicles exist in the absence of magnetite, biomineralization of magnetite proceeds simultaneously in multiple vesicles, and biomineralization proceeds from the same location in each vesicle. The magnetosome-associate...

2017
Shuang Yang Jian-Tang Jiang Cheng-Yan Xu Yang Wang Yan-Yan Xu Lei Cao Liang Zhen

We report the thermal annealing-induced formation of ring-like structure of Zn(II)-doped magnetite from iron alkoxide leaf-like nanoplate precusor. The phase, structure and morphology of magnetite nanorings were comprehensively characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscope, scanning electron microscope, and transmission electron microscope....

2016
Rurik Farias-Mancilla José T. Elizalde-Galindo Enrique Vigueras-Santiago Claudia A. Hernández-Escobar Alejandro Vega-Rios E. Armando Zaragoza-Contreras

A conducting-electroactive polyaniline/magnetite (PAni/Fe304) nanocomposite was synthesized using anilinium dodecylbenzene sulfonate (S1) as a reactive surfactant. First, S1 allowed magnetite dispersion in the aqueous phase and second, S1 performed as the monomer of polyaniline emeraldine base salt. Electron microscopy suggested core-shell morphology based on S1 amphiphilic character; that is, ...

M. Masteri-Farahani, R. Kamrani

A new hybrid nanomaterial was developed by immobilization of phosphomolybdate anions on the surface of modified magnetite nanoparticles with quaternary phosphonium cations. Silica coated magnetic nanoparticles supported phosphonium cations, Ph3P+-SCMNPs, were prepared by covalent attachment of chloropropylsilyl groups on the surface of silica coated magnetite nanoparticles...

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