Magnetic switching of ferromagnetic nanotubes

Sharif, Rehana; Shamaila, S.; Ma, M.; Yao, Lixiu; Yu, Ronghai; Han, X. F.; Khaleeq-ur-Rahman, M.

doi:10.1063/1.2836272

Cited by 63 publications

(50 citation statements)

References 18 publications

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“…21 Most of the reports on the synthesis of magnetic nanotubes are by chemical modification of inner surface of the porous template prior to the deposition. 4,9,10,15,17 However, these techniques result in low yield and impure structures. Moreover, the mechanism leading to the formation of nanostructures from nanoporous template is seldom elucidated, which is very essential for tailoring the properties of these nanostrustures.…”

Section: Introductionmentioning

confidence: 99%

“…4,9,10,15 There are also reports where nanotubes and nanowires have been synthesized by using highly sophisticated techniques such as pulse laser deposition or molecular beam epitaxy. 16,17 Ferromagnetic nanotubes based on Ni, Fe, and Co are being investigated in great detail due to their application potential in diverse fields such as perpendicular magnetic recording, cell separation, diagnosis, therapeutics, and magnetic resonance imaging for detection. The ease with which they can be functionalized by using a specific group is an added advantage of these nanostructures and can be used for drug targeting and other applications in biotechnology.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of High Coercivity Cobalt Nanotubes with Acetate Precursors and Elucidation of the Mechanism of Growth

et al. 2008

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Cobalt nanotubes (CoNTs) with very high longitudinal coercivity were prepared by electrodeposition of cobalt acetate for the first time by using anodized alumina (AAO) template. They were then characterized with X-ray diffraction (XRD), a field emission scanning electron microscope (FESEM), and a transmission electron microscope (TEM). Formation of a highly ordered hexagonal cobalt phase is observed. Room temperature SQUID (superconducting quantum interference device) magnetometer measurements indicate that the easy axis of magnetization is parallel to the nanotube axis. These CoNTs exhibit very high longitudinal coercivity of ∼820 Oe. A very high intertubular interaction resulting from magnetostatic dipolar interaction between nanotubes is observed. Thick-walled nanotubes were also fabricated by using cobalt acetate tetrahydrate precursors. A plausible mechanism for the formation of CoNTs based on mobility assisted growth is proposed. The role of the hydration layer and the mobility of metal ions are elucidated in the case of the growth mechanism of one-dimensional geometry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of High Coercivity Cobalt Nanotubes with Acetate Precursors and Elucidation of the Mechanism of Growth

et al. 2008

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“…It should be noted that the loop measured at different directions of the magnetic field relative to the main axis of the NTs has different character, which indicates the presence of the magnetic anisotropy in the samples: coercivity and squarness value for parallel orientation ( c|| = 330 Oe, r|| / s|| = 0.39) of the field relative to the NTs axis is several times higher than the values for the perpendicular field direction ( c⊥ = 130 Oe, r⊥ / s⊥ = 0.09). The anisotropy of the magnetic properties could be defined by either crystalline anisotropy, detected in the X-ray analysis, or shape anisotropy, caused by the fact that in an external magnetic field NTs with high aspect ratio (∼100) need higher energy of demagnetization along their axis than in the perpendicular direction of the field [15,17].…”

Section: Resultsmentioning

confidence: 99%

“…This problem does not allow making a sufficient force for the blood flow resistance. Nanowires and nanotubes (NTs) allow overcoming typical limitations for nanoparticles due to their elongated form and anisotropy of magnetic properties [11][12][13][14][15][16][17][18][19]. In comparison with nanowires, NTs have some potential advantages.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Study of Ni Nanotubes for Bioapplications: From Synthesis to Payloads Attaching

Kozlovskiy

Korolkov

Kalkabay

et al. 2017

Journal of Nanomaterials

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Due to the Ni nanotubes' shape anisotropy, low specific density, large specific surface, and uniform magnetic field, they have been offered as carriers for targeted delivery of drug or protein and the process of their formation from synthesis stage to the stage of surface modification and protein attaching has been demonstrated. Some steps to hasten their biomedical application have been applied. First, to have full control over the carrier dimensions and structure parameters, electrodeposition method in pores of polyethylene terephthalate template has been applied. Second, to understand the scope of Ni nanostructures application, their degradation in media with different acidity has been studied. Third, to improve the biocompatibility and to make payloads attachment possible, nanotubes surface modification with organosilicon compound has been carried out. At last, the scheme of protein attaching to the nanostructure surface has been developed and the binding process was demonstrated as an example of the bovine serum albumin.

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“…Structural analysis understanding can be used to fabricate crystalline or amorphous nanowires and nanotubes according to the required applications. Shamaila et al, 2008b;Shamaila et al, 2009a;Shamaila et al, 2009b;Sharif et al, 2006;Sharif et al, 2007;Sharif et al, 2008a;Sharif et al, 2008b). Shape and geometry dependent magnetization behaviour of the CoPt nanowires and nanotubes is explained here.…”

Section: Characterizationmentioning

confidence: 99%