Polyacrylamide Ferrogels with Ni Nanowires

Polyacrylamide Ferrogels with Ni Nanowires

Nickel magnetic nanowires (NWs) have attracted significant attention due to their unique properties, which are useful for basic studies and technological applications, for example in biomedicine. Their structure and magnetic properties were systematically studied in the recent years. In this work, N...

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Bibliographic Details
Published in:Materials Vol. 12; no. 16; p. 2582
Main Authors: Safronov, Alexander P, Stadler, Bethanie J H, Um, Joseph, Zamani Kouhpanji, Mohammad Reza, Alonso Masa, Javier, Galyas, Andrey G, Kurlyandskaya, Galina V
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 13-08-2019
MDPI
Subjects:
Aluminum oxide
Anisotropy
Aspect ratio
Composite materials
Domain walls
electrochemical deposition
Electrodes
Electrolytes
ferrogels
Free radical polymerization
Free radicals
Hydrogels
Hysteresis loops
Magnetic fields
Magnetic properties
Magnetization reversal
nanomagnetism
Nanoparticles
Nanowires
Nickel
nickel nanowires
Photon correlation spectroscopy
Polyacrylamide
Polymerization
Scanning electron microscopy
Scientific imaging
Sedimentation & deposition
United States > US
Germany
ferrogels
electrochemical deposition
nanomagnetism
nickel nanowires
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Summary:Nickel magnetic nanowires (NWs) have attracted significant attention due to their unique properties, which are useful for basic studies and technological applications, for example in biomedicine. Their structure and magnetic properties were systematically studied in the recent years. In this work, Ni NWs with high aspect ratios (length/diameter ~250) were fabricated by electrodeposition into commercial anodic aluminum oxide templates. The templates were then etched and the NWs were suspended in water, where their hydrodynamic size was evaluated by dynamic light scattering. The magnetic response of these NWs as a function of an external magnetic field indicates a dominant shape anisotropy with propagation of the vortex domain wall as the main magnetization reversal process. The suspension of Ni NWs was used in the synthesis of two types of polyacrylamide ferrogels (FGs) by free radical polymerization, with weight fractions of Ni NWs in FGs of 0.036% and 0.169%. The FGs were reasonably homogeneous. The magnetic response of these FGs (hysteresis loops) indicated that the NWs are randomly oriented inside the FG, and their magnetic response remains stable after embedding.
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content type line 23
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12162582