Stress‐driven transport in ordered porous anodic films

Houser, Jerrod E.; Hebert, Kurt R.

doi:10.1002/pssa.200779407

Cited by 32 publications

(30 citation statements)

References 26 publications

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“…In contrast with the previous oxide flow model [41][42][43][44][45][46][47][48][49][50][51] in which pores were assumed to form by oxide flow from the pore bases to pore walls driven by mechanical stresses, in our model, pores are formed by electric field-assisted oxide decomposition at the o/e interface and oxide formation at the m/o interface.…”

Section: Discussionmentioning

confidence: 94%

Establishment of a Kinetics Model

Cheng

2015

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

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In this chapter [1], a kinetics model for pore channel growth in anodic porous alumina during anodization is established based on the Laplacian electric potential distribution within the oxide and a continuity equation for current density within the oxide body. Both oxygen and aluminum ion current densities governed by the Cabrera-Mott equation in high electric field theory are formed by ion migration within the oxide as well as across the oxide/electrolyte (o/e) and metal/oxide (m/o) interfaces. In contrast with previous well-known oxide flow models as introduced in Chap. 1, in the present model, the movements of the o/e and m/o interfaces due to electric field-assisted oxide decomposition and metal oxidation, respectively, are governed by Faraday's law. This model can be numerically implemented by a finite element method in order to simulate the real-time evolution of the porous structure growth, which will be shown in Chap. 3.

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Section: Discussionmentioning

confidence: 94%

Establishment of a Kinetics Model

Cheng

2015

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

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“…In contrast to the flourishing picture of applications of anodic porous alumina in various fields, the formation mechanism of anodic porous alumina has been continuously investigated and under debate for more than six decades [1,96,, i.e., from Edwards and Keller [145,146] [147][148][149] in the 1970-1980s, Parkhutik and Shershulsky [130], Golovin et al [132][133][134], Jessensky et al [137,150], Li et al [99,138], in the 1990s, Patermarakis et al [135,136,[151][152][153][154], Garcia-Vergara et al [155][156][157][158][159][160] in the 2000-2010s, and most recently Hebert and Houser [139][140][141][142][143] in 2012. However, contradictory viewpoints still exist and no generally accepted theory has been established.…”

Section: Formation Mechanisms Of Anodic Porous Aluminamentioning

confidence: 98%

“…Since the pioneering work in 1950s by Keller [102], Dewald [204,205], Vermilyea [206,207], and Cabrera and Mott [163], several groups have carried out further theoretical work, including the Wood and Thompson group in Manchester [2,95,96,118,128,155,156,208], the Gösele group in Max-Plank-Institute [99,137,138,150,178], the Patermarakis group in Greece [135,136,[151][152][153][154], the Parkhutik group in Minsk [130,209], the Golovin group in Northwestern [132][133][134], and the Hebert group in Iowa State [139][140][141][142][143]. Systematical elucidation of the theory in mathematical forms began from work done by the Parkhutik group [130] in 1992, and numerical simulation was started by the Golovin [133] and Hebert [139] groups in 2006.…”

Section: Objectives and Flow Of The Present Researchmentioning

confidence: 99%

Research Background and Motivation

Cheng

2015

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

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Anodic porous alumina, which exhibits a characteristic nano-honeycomb structure, has received increasing attention both experimentally and theoretically . Due to the quasi-periodic arrangement of the nanopore channels, narrow distribution of pore sizes, and interpore distances, relative ease to control the porous scales and self-ordering qualities by anodization conditions, excellent thermal stability, and very low-cost anodic porous alumina has been extensively used as templates for fabrication of various nanostructured materials such as nanodots [22][23][24], nanowires [25][26][27][28][29], nanotubes [30][31][32], and many other types [33][34][35], especially to realize the collective functioning of arrays of nanoelements which may not be realized by individual nanoelements [5,36], for applications in high-density magnetic media [37][38][39][40][41][42] [95,96]. For neutral electrolytes with pH in the range of 5-7, such as boric acid solution, ammonium borate, or tartrate aqueous solution, only barrier-type anodic alumina films with a uniform thickness will be formed by anodization [1,97]. The configuration of anodic porous alumina is composed of closely packed arrays of nanopore channels perpendicular to the aluminum substrate with pore diameters on the order of several to hundreds of nanometers [58,[93][94][95]98]. When viewed from the top, the nanopores are usually arranged in a quasi-hexagonal porous pattern. The in-plane arrangement of pore channels generally exhibits local variations with ordered zones separated with disordered zone boundaries, which is much similar to the crystallographic grains and grain boundaries of the Al substrate. However, the perfect ordered zones are at most several micrometers big even for highly self-ordered patterns, while the grain

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“…Modelling of the porous oxide growth on aluminium, which besides oxide formation at the barrier layer also involves the formation of a porous structure, has received far less attention. Relevant to mention on this topic are the configuration of the electrical field and current density in the scalloped barrier oxide at the pore bottom modelled by Parkhutik and Shershul'skii [11], and the more recent simulations of the displacement of the interfaces of the barrier oxide and the growth of the porous structure due to the flow oxide material by Houser and Hebert [12][13][14].…”

Section: Introductionmentioning

confidence: 99%