Highly ordered porous alumina membranes for Ni–Fe nanowires fabrication

Vorobjova, Alla; Шиманович, Д. Л.; Outkina, E. A.; Khodin, Aliaksandr

doi:10.1007/s00339-017-1401-8

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…The membranes were synthesized by two-step anodizing in oxalic acid at 50 V and 15 °C with auxiliary technological frame around the perimeter to be mechanically stable enough to handle under the following processing steps. In detail the membrane technique and its property are described in works [3,4].…”

Section: Methodsmentioning

confidence: 99%

Thermal Stability of Nano-Crystalline Nickel Electrodeposited into Porous Alumina

Тишкевич¹,

Vorobjova

Труханов³

2020

SSP

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Through-pores alumina membranes of 50 μm thickness and 70 × 70 mm size have been fabricated to deposit Ni nanowires by electrochemical processing. Due to highly ordered microstructure of the membranes, the pores were filled by nanowires almost to 100%. The membrane nanowires composite morphology, structure and thermodynamic characteristics have been studied by scanning electron microscopy, atomic-force microscopy, X-ray diffraction and differential thermal analysis. The thermal stability of Ni nanowires into porous alumina template and whole composite was determined.

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Section: Methodsmentioning

confidence: 99%

Thermal Stability of Nano-Crystalline Nickel Electrodeposited into Porous Alumina

Тишкевич¹,

Vorobjova

Труханов³

2020

SSP

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Section: Resultsmentioning

confidence: 99%

“…The obtained samples were analyzed using the SEM technique after each main stage of the PAA production process. Chemical etching technology [58] was used to remove the barrier layer at the bottom of the pores, and several types of samples with different pore sizes were produced (Table 1). With a proportionality constant λ p of approximately 1.29 nm × V −1 , the pore diameter of the PAA d is linearly proportional to the anodizing voltage U [59]:…”

Section: Topological Features Of the Paamentioning

confidence: 99%

The Interrelation of Synthesis Conditions and Wettability Properties of the Porous Anodic Alumina Membranes

Тишкевич

Vorobjova

Bondaruk³

et al. 2022

Nanomaterials

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The results of studies on the wettability properties and preparation of porous anodic alumina (PAA) membranes with a 3.3 ± 0.2 μm thickness and a variety of pore sizes are presented in this article. The wettability feature results, as well as the fabrication processing characteristics and morphology, are presented. The microstructure effect of these surfaces on wettability properties is analyzed in comparison to outer PAA surfaces. The interfacial contact angle was measured for amorphous PAA membranes as-fabricated and after a modification technique (pore widening), with pore sizes ranging from 20 to 130 nm. Different surface morphologies of such alumina can be obtained by adjusting synthesis conditions, which allows the surface properties to change from hydrophilic (contact angle is approximately 13°) to hydrophobic (contact angle is 100°). This research could propose a new method for designing functional surfaces with tunable wettability. The potential applications of ordinary alumina as multifunctional films are demonstrated.

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“…The MPAA backside was coated with a chemically resistant varnish before the NWs electrodeposition. The process of a free MPAA manufacture is described in more detail in our previous works [ 45 , 46 ].…”

Section: Methodsmentioning

confidence: 99%

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

et al. 2021

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High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized.

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Highly ordered porous alumina membranes for Ni–Fe nanowires fabrication

Cited by 5 publications

References 27 publications

Thermal Stability of Nano-Crystalline Nickel Electrodeposited into Porous Alumina

Thermal Stability of Nano-Crystalline Nickel Electrodeposited into Porous Alumina

The Interrelation of Synthesis Conditions and Wettability Properties of the Porous Anodic Alumina Membranes

Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane

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