Barrier‐Type anodic films on aluminium in aqueous borate solutions: 1—Film density and stopping power of anodic alumina films for alpha particles

Skeldon, P.; Shimizu, K.; Thompson, G.E.; Wood, G. C.

doi:10.1002/sia.740050605

Cited by 80 publications

(31 citation statements)

References 23 publications

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“…The gradient for the bulk aluminium was 2.30 ± 0.01 V s −1 . Respective gradients of 2.35 and 1.56 V s −1 are calculated for formation of oxide at 100% efficiency, using Faraday's law and densities of 3.1 [18] and 9.68 g cm −3 [19] and the present formation ratios of ∼1.2 and 1.8 nm V −1 for alumina and hafnia respectively. Previously, a formation ratio of 2.0 nm V −1 has been reported for anodic hafnia [20].…”

Section: Discussionmentioning

confidence: 99%

Formation of anodic films on sputtering-deposited Al–Hf alloys

Fogazza

Santamaria

Quarto

et al. 2009

Electrochimica Acta

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a b s t r a c tThe growth of barrier-type anodic films at high efficiency on a range of sputtering-deposited Al-Hf alloys, containing from 1 to 95 at.% Hf, has been investigated in ammonium pentaborate electrolyte. The alloys encompassed nanocrystalline and amorphous structures, the latter being produced for alloys containing from 26 to 61 at.% Hf. Except at the highest hafnium content, the films were amorphous and contained units of HfO 2 and Al 2 O 3 distributed relatively uniformly through the film thickness. Boron species were confined to outer regions of the films. The boron distributions suggest that the cation transport number decreases progressively with increasing hafnium concentration in the films, from ∼0.4 in anodic alumina to ∼0.2 for a film on an Al-61 at.% Hf alloy. The distributions of Al 3+ and Hf 4+ ions in the films indicate their similar migration rates, which correlates with the similarity of the energies of Al 3+ -O 2− and Hf 4+ -O 2− bonds. For an alloy containing ∼95 at.% Hf, the film was largely nanocrystalline, with a thin layer of amorphous oxide, of non-uniform thickness, at the film surface. The formation ratios for the films on the alloys changed approximately in proportion to the hafnium content of the films between the values for anodic alumina and anodic hafnia, ∼1.2 and 1.8 nm V −1 respectively.

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Section: Discussionmentioning

confidence: 99%

Formation of anodic films on sputtering-deposited Al–Hf alloys

Fogazza

Santamaria

Quarto

et al. 2009

Electrochimica Acta

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“…The value for the cell wall density (2850 kg/ m 3 ) is in line with values forasolid barrier film (3000 kg/m 3 ) [6]. Putting these values into Nielsen's model using an assumed value of 0.2256 for the Poisson's ratio of the cell wallmaterial [3], values for other elastic constants are estimated.…”

Section: Normal Incidence Reflection Coefficient Measurements Measurementioning

confidence: 62%

Adhesive/Adherend Interlayer Property Measurement by Acoustic Microscopy

Zeller

Kinloch

Cawley

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

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“…First, after the longest anodization time (650 s) among the simulation group, the initial pore has negligible growth as in Fig. 4.3a, so that it can be regarded as barrier-type alumina without nanoporous structure formation, which was truly observed under nearneutral electrolyte conditions, such as aqueous borate solutions [23] or 0.001 M H 2 C 2 O 4 in this chapter (Fig. 4.4).…”

Section: Resultsmentioning

confidence: 94%

Experimental Verification I: Growth Sustainability of Nanopore Channels Guided with Pre-patterns

Cheng

2015

Electro-Chemo-Mechanics of Anodic Porous Alumina Nano-Honeycombs: Self-Ordered Growth and Actuation

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As mentioned in Chap. 1, although anodic porous alumina has been widely used as templates for fabricating various nanostructured materials, the self-organization mechanism of anodic porous alumina during the growth of nanopore channels, which finally determines the self-ordering quality of the in-plane porous patterns have been under debate for decades [1][2][3][4][5][6]. Recent experimental results on prepattern guided growth of pore channels in anodic porous alumina have provided very useful cases for the investigation of self-ordering mechanism, and also a reference system for verifying the theoretical models. It has been reported that if the Al surface was pre-patterned with nanopits by methods such as focused ion beam (FIB) patterning [7,8] or nanoimprinting by molds [9,10], the pore channels would prefer to nucleate at these pits, and then be guided to grow toward the Al substrate during anodization. In this way, designed perfect porous patterns other than the general quasi-hexagonal configuration can be obtained [9,11]. Also long-range ordered anodic porous alumina over a few mm 2 of area was achievable as long as the pre-pattern made on the Al surface was in the same size [10]. However, even anodized under self-ordering conditions, the pre-pattern cannot be sustained by the newly formed anodic porous alumina after a short anodization period or oxide thickness; as a result the aspect ratio of pre-pattern guided pore channels was limited to a few hundred for hexagonal pre-patterns, and much smaller for other kinds of pre-patterns [10,12].From both experimental and numerical simulation viewpoints, this chapter will show that the above experimental phenomena are intrinsically governed by the selforganization nature of anodic porous alumina under certain anodization conditions, which really determine the growth sustainability of pore channels guided by prepatterns [13]. Numerical simulation of real-time pore channel evolution was carried out based on the established kinetics model in Chap. 2. In contrast with the oxide flow model [5], in which pore channels were assumed to grow by oxide flowing

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Barrier‐Type anodic films on aluminium in aqueous borate solutions: 1—Film density and stopping power of anodic alumina films for alpha particles

Cited by 80 publications

References 23 publications

Formation of anodic films on sputtering-deposited Al–Hf alloys

Formation of anodic films on sputtering-deposited Al–Hf alloys

Adhesive/Adherend Interlayer Property Measurement by Acoustic Microscopy

Experimental Verification I: Growth Sustainability of Nanopore Channels Guided with Pre-patterns

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