Two-dimensional spatially ordered Al2O3 systems: Small-angle neutron scattering investigation

Grigor’ev, S. V.; Григорьева, Н. А.; Syromyatnikov, A. V.; Napolskii, K. S.; Eliseev, A. A.; Lukashin, A. V.; Tret’yakov, Yu. D.; Eckerlebe, H.

doi:10.1134/s0021364007090081

Cited by 23 publications

(15 citation statements)

References 16 publications

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“…The singledomain-like appearance of the diffraction pattern indicates that the orientational order extends over distances larger than the size of the irradiated area. Moreover, our recent results obtained using small-angle neutron scattering testify that even at a beam size of 8 mm the spot-like diffraction pattern can be observed (Grigor'ev et al, 2007). Thus, the two-step anodization technique allows us to prepare AAO membranes with a very high degree of orientational order and homogeneity of the porous oxide films on a scale of up to a centimetre.…”

Section: Resultsmentioning

confidence: 65%

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Long-range ordering in anodic alumina films: a microradian X-ray diffraction study

et al. 2010

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A quantitative analysis of long-range order in the self-organized porous structure of anodic alumina films has been performed on the basis of a microradian X-ray diffraction study. The structure is shown to possess orientational order over macroscopic distances larger than 1 mm. At the same time, the interpore positional order is only short-range and does not extend over more than $10 interpore distances. These positional correlations are mostly lost gradually rather than at the domain boundaries, as suggested by the divergence of the peak width for the higher-order reflections. In the direction of the film growth the pores have a very long longitudinal self-correlation length of the order of tens of micrometres.

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Section: Resultsmentioning

confidence: 65%

“…Taking into account the size of the irradiated area (0.5 Â 0.5 mm), we can suppose that these diffraction patterns are obtained from the oxide film grown on a single-crystal substrate. In this case, the influence of grain boundaries on pore ordering in the oxide film (Grigor'ev et al, 2007) is negligible.…”

Section: Resultsmentioning

confidence: 98%

Long-range ordering in anodic alumina films: a microradian X-ray diffraction study

et al. 2010

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“…These results show in particular that this experimental approach would for the first time allow different types of porosity to be distinguished, in particular different spongy porosities. This approach is complementary to previous studies that focused on the evaluation of pore ordering degree and pore branching. The results also highlight the influence of forming steps of the substrate (here rolled AA 2024 [1 mm] or machined AA 2024 [3 mm]) on subsequent porosity of the anodic films, despite strictly identical surface treatments.…”

Section: Resultsmentioning

confidence: 96%

Accurate evaluations of both porosity and tortuosity of anodic films grown on rolled AA 1050 and on rolled or machined AA 2024 T3

Giffard

Arurault

Blanc

et al. 2018

Surface & Interface Analysis

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The porosity of the anodic films grown on aluminium substrates depends on various operating conditions related to the anodization electrolyte and to the applied electrical parameters, as well as to the substrate itself. In the present study, three different aluminium substrates were studied and anodized: AA 1050 (rolled; thickness = 1 mm), AA 2024 T3 (rolled; 1 mm), and AA 2024 T3 (machined; 3 mm). For each type of anodic film, the porosity, as well as its changes during anodization, was accurately characterized using both field‐emission gun scanning electron microscopy (FEG‐SEM) and a reanodization technique. Moreover, for the first time, the corresponding tortuosity was quantified for all studied substrates. Results for rolled AA 2024 T3 and for machined AA 2024 T3 especially showed significant differences in tortuosity values, contributing towards clarifying, in part, their different wettability characteristics or anticorrosion behaviour, so far not clearly explained.

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“…A fur ther increase in the recording density calls for the development of materials containing ordered arrays of anisotropic magnetic particles. The most promising method of forming such nanostructures on a large area is via self organization processes [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Polarized-neutron scattering from an array of magnetic nanowires embedded into a nonmagnetic matrix

Iashina

Grigoryeva

Dubitskiy

et al. 2015

J. Synch. Investig.

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Neutron scattering from spatially ordered arrays of magnetic nanowires synthesized inside a non magnetic matrix is theoretically described. Expressions for the nuclear, magnetic, and interference contribu tions to the neutron scattering cross section are obtained. It is shown that, when polarized neutrons are scat tered from an array of magnetic nanowires, the scattering cross section is not only a nonlinear function of the nanowire length but also depends on the neutron wavelength. These expressions describe the complex nature of the neutron diffraction pattern as a factor of the ratio of nuclear and magnetic scattering amplitudes.Keywords: small angle polarized neutron scattering, magnetic properties of anisotropic nanoparticles, spa tially ordered arrays of magnetic nanowires

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Two-dimensional spatially ordered Al2O3 systems: Small-angle neutron scattering investigation

Cited by 23 publications

References 16 publications

Long-range ordering in anodic alumina films: a microradian X-ray diffraction study

Long-range ordering in anodic alumina films: a microradian X-ray diffraction study

Accurate evaluations of both porosity and tortuosity of anodic films grown on rolled AA 1050 and on rolled or machined AA 2024 T3

Polarized-neutron scattering from an array of magnetic nanowires embedded into a nonmagnetic matrix

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