Evaluation of the influence of synthesis conditions on the morphology of nanostructured anodic aluminum oxide coatings on Al 1050

Bruera, Florencia Alejandra; Krämer, G.; Vera, María L.; Ares, Alicia Esther

doi:10.1016/j.surfin.2020.100448

Cited by 8 publications

(12 citation statements)

References 38 publications

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“…Table 3 presents the results of the morphological parameter adjustments according to the synthesis variables for the range of levels studied using sulphuric acid as electrolyte. The presented results with sulphuric acid can be compared with those obtained by Bruera et al [29] using oxalic acid as electrolyte. For example, dp and di do not depend only on voltage in oxalic acid, but also on the interaction between voltage and temperature; ρ depends on the concentration and voltage as in sulphuric acid and e depends on the effect of the three synthesis variables in oxalic acid, in addition to the interaction between temperature and voltage with sulphuric acid.…”

Section: Porositymentioning

confidence: 55%

“…The nanopores in the anodic films were characterized by scanning electron microscopy (SEM), using a SUPRA 40 (Carl Zeiss NTS GmbH, Buenos Aires, Argentina) equipment. The ordering of the porous structures, the average pore diameter (dp), the interpore distance (di), the pore density (ρ) and the porosity P were determined from SEM micrographs with the free software ImageJ (1.50i version) [29,[32][33][34].…”

Section: Morphological Characterization Of Coatingsmentioning

confidence: 99%

“…In previous works, the combined influence of synthesis variables on morphological parameters was exhaustively analyzed by using oxalic acid as electrolyte [11,15,29]. This type of analysis is still pending for other electrolytes, such as sulphuric acid, which would contribute to the optimization of resources in the anodic synthesis of OAA and facilitate the selection of the best synthesis conditions to obtain nanostructured films with a specific morphology as a function of the required application.…”

Section: Introductionmentioning

confidence: 99%

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Low-Cost Nanostructured Coating of Anodic Aluminium Oxide Synthesized in Sulphuric Acid as Electrolyte

et al. 2021

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The anodic oxidation of aluminium is an electrochemical technique that allows obtaining nanostructures with easily adjustable morphology depending on the synthesis variables, for its application in medicine, engineering, biotechnology, electronics, etc. In this work, low-cost aluminium oxide nanostructured films were synthesized and morphologically characterized using two anodization steps in sulphuric acid, varying the concentration and temperature of the electrolyte and anodization voltage. The order of the porous matrix, pore diameter, interpore distance, pore density, thickness, and porosity were measured and statistically analyzed. The results showed that under the proposed conditions it is possible to synthesize low-cost nanoporous aluminium oxide films, with a short-range ordering, being the best ordering conditions 10 °C and 0.3 M sulphuric acid at 20 V and 5 °C and 2 M sulphuric acid at 15 V. Furthermore, it was determined that the pore diameter and the interpore distance vary proportionally with the voltage, that the pore density decreases with the voltage and increases with the concentration of the electrolyte, and that the thickness of the oxide film increases with electrolyte concentration, temperature, and anodization voltage.

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Section: Porositymentioning

confidence: 55%

Section: Morphological Characterization Of Coatingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-Cost Nanostructured Coating of Anodic Aluminium Oxide Synthesized in Sulphuric Acid as Electrolyte

et al. 2021

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“…This hollow carbon nanostructured film was fabricated by precisely tailoring the nanopores of the anodized aluminum oxide (AAO) template, which has been widely used to form a dense array of nanochannels [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. The AAO template allows precise control of nanoscale pores such as the length, width, and diameter [ 21 , 27 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ], enabling the design of cup-shaped nanostructures with low aspect ratio. By depositing carbon materials on this AAO template, low aspect ratio graphitic nanoscale cup structures can be fabricated, resulting in a film of uniformly arranged carbon nanocups (see Figure 1 ).…”

Section: Introductionmentioning

confidence: 99%

Graphitic Nanocup Architectures for Advanced Nanotechnology Applications

et al. 2020

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The synthesis of controllable hollow graphitic architectures can engender revolutionary changes in nanotechnology. Here, we present the synthesis, processing, and possible applications of low aspect ratio hollow graphitic nanoscale architectures that can be precisely engineered into morphologies of (1) continuous carbon nanocups, (2) branched carbon nanocups, and (3) carbon nanotubes–carbon nanocups hybrid films. These complex graphitic nanocup-architectures could be fabricated by using a highly designed short anodized alumina oxide nanochannels, followed by a thermal chemical vapor deposition of carbon. The highly porous film of nanocups is mechanically flexible, highly conductive, and optically transparent, making the film attractive for various applications such as multifunctional and high-performance electrodes for energy storage devices, nanoscale containers for nanogram quantities of materials, and nanometrology.

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“…17,19 A local temperature increase leads to faster chemical dissolution and destruction of the oxide layer, and the temperature difference between the aluminum substrate and the electrolyte is an important parameter influencing the formation of the ordered structure. 2,20,21 Therefore, to better understand the pore formation process at the initial stage of disordered growth, it is necessary to study the peculiarities of developing porous aluminum oxide surface morphology at different electrolyte temperatures.…”

mentioning

confidence: 99%

Influence of Induced Local Stress on The Morphology of Porous Anodic Alumina at The Initial Stage of Oxide Growth

Chernyakova,

Tzaneva,

Jagminas

et al. 2023

J. Electrochem. Soc.

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A characteristic feature of the disordered pore growth at the initial stage of aluminum anodizing is the development of three large groups of pores: the major pores of larger diameter and two groups of minor pores of smaller diameter. The samples were obtained by the electrochemical oxidation of thin aluminum films (100 nm thick) on SiO2/Si substrates in a 0.3 M oxalic acid at 30 V at 5–40 °C. According to SEM studies, the pore distribution by diameter for the films obtained at 20 and 40 °C has three distinct peaks at ca. 13.5, 17.2, and 20.3 nm. The ratio of the diameter of major pores to the diameter of minor pores of group 1 or group 2 is constant and approximately equal to 1.17 and 1.51, respectively. The generation of local compressive stress influences the development of porous morphology. The distribution of zones with high and low compressive stress levels inside hexagonal cells is shown, and their correlation with the porous morphology is confirmed. The generation of local stress and strains in the anodic alumina layer with a porous, cellular structure is associated with local areas with changes in the geometric properties on its surface.

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Evaluation of the influence of synthesis conditions on the morphology of nanostructured anodic aluminum oxide coatings on Al 1050

Cited by 8 publications

References 38 publications

Low-Cost Nanostructured Coating of Anodic Aluminium Oxide Synthesized in Sulphuric Acid as Electrolyte

Low-Cost Nanostructured Coating of Anodic Aluminium Oxide Synthesized in Sulphuric Acid as Electrolyte

Graphitic Nanocup Architectures for Advanced Nanotechnology Applications

Influence of Induced Local Stress on The Morphology of Porous Anodic Alumina at The Initial Stage of Oxide Growth

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