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  Preparation and magnetoviscosity of nanotube ferrofluids by viral scaffolding and ALD on porous templates

Wu, Z., Zierold, R., Mueller, A., Ruff, S. E., Ma, C., Khan, A. A., et al. (2010). Preparation and magnetoviscosity of nanotube ferrofluids by viral scaffolding and ALD on porous templates. Physica Status Solidi B, 247(10), 2412-2423. doi:10.1002/pssb.201046208.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-1142-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0002-1143-F
Genre: Journal Article

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PhysStatusSolidB_247_2010_2412.pdf (Any fulltext), 870KB
 
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 Creators:
Wu, Zhenyu, Author
Zierold, Robert, Author
Mueller, Anna, Author
Ruff, S. Emil, Author
Ma, Chenchen, Author
Khan, Abid A., Author
Geiger, Fania1, Author              
Sommer, Bernd A., Author
Knez, Mato, Author
Nielsch, Kornelius, Author
Bittner, Alexander M., Author
Wege, Christina, Author
Krill, Carl E., Author
Affiliations:
1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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Free keywords: atomic layer deposition, ferrofluids, nanotubes, synthesis, templates, Tobacco mosaic virus
 Abstract: Current models for magnetoviscosity suggest that replacing the spherical nanoparticles of a conventional ferrofluid with magnetic nanotubes would lead to a stronger field‐induced viscosity enhancement and a much‐improved stability against shear thinning – two important parameters for technological exploitation of the magnetoviscous effect. We report the development of positive and negative templating strategies for the synthesis of magnetic nanotubes out of a variety of materials. Our positive template is Tobacco mosaic virus (TMV) – in natural form or genetically engineered to express specific surface chemistries and lengths – which we exploit as a template for the electroless deposition (ELD) of nanosized clusters of nickel and as a scaffold for magnetic particles in a conventional ferrofluid. Our negative templating strategy employs porous anodic aluminum oxide (AAO) as a substrate for the atomic layer deposition (ALD) of a conformal coating of iron oxide, offering precise control over the length and wall thickness of the resulting nanotubes. Both strategies were scaled up to produce the mass quantities of uniform‐aspect‐ratio nanotubes that are needed for macroscopic ferrofluid volumes. The magnetoviscosity of these “nanotube ferrofluid” samples was studied as a function of applied magnetic field and shear frequency, and a particularly strong effect was found to be induced by viral scaffolding.

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Language(s): eng - English
 Dates: 2010-07-302010-04-232010-08-032010-09-082010-10
 Publication Status: Published in print
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/pssb.201046208
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Title: Physica Status Solidi B
  Abbreviation : Phys. Stat. Sol. B
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 247 (10) Sequence Number: - Start / End Page: 2412 - 2423 Identifier: ISSN: 0370-1972
CoNE: https://pure.mpg.de/cone/journals/resource/958480240330