Anodic Alumina Films Prepared by Powerful Pulsed Discharge Oxidation

Lisenkov, Aleksey D.; Salak, Andrei N.; Poznyak, S.K.; Zheludkevich, Mikhail L.; Ferreira, M.G.S.

doi:10.1021/jp2050542

Cited by 8 publications

(17 citation statements)

References 33 publications

(86 reference statements)

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“…As it was shown previously 15 in highly conductive electrolytes, such as 0.1 M ammonium pentaborate, the full discharge takes less than 0.5 s. In deionized water the applied voltage decays down to 100 V over a period of more than 100 s (Fig. 2).…”

Section: Resultssupporting

confidence: 54%

“…In the conventional electrolyte, a plasma layer is formed on the anode surface and the oxide growth occurs in this layer. 8,15 Taking into account the growth rate of the films, their composition and structure, it can be suggested that the growth mechanism is similar to that obtained in potentiostatic method in conventional solutions where plasma is not similarly formed during film growth. 10 In highly conductive solutions such as potassium hydroxide, an increase of the voltage to values higher than 100 V usually results in the formation of oxide film by PEO process, where a breakdown of the oxide followed by formation of plasma discharges and rapid growth of the porous anodic film occurs.…”

Section: Resultsmentioning

confidence: 89%

“…These results are a consequence of the nonuniform thickness of the oxide in the different areas. 10,15 It was also observed that applying a constant high voltage to the electrochemical cell with deionized water (for periods longer than 1-2 min) led to the appearance of breakdown processes on the surface.…”

Section: Resultsmentioning

confidence: 99%

“…The oxide structure in the latter case is similar to the films previously prepared by powerful pulsed oxidation in ammonium pentaborate. 15 SKPFM measurements (Fig. 4A) on the Al surfaces treated in deionized water by potentiostatic oxidation demonstrate nonuniform charge distribution on the surface: the Volta potential changed across the film, rising in the most defected zones (up to +10 mV vs. Ni) and decreasing in the intact areas (down to −9.7 mV vs. Ni).…”

Section: Resultsmentioning

confidence: 99%

“…In deionized water, the measurements do not reveal the presence of plasma since besides the time elapsed, the current is low compared to previous works. 8,15 This is due to a large potential drop in the electrolyte bulk. In the conventional electrolyte, a plasma layer is formed on the anode surface and the oxide growth occurs in this layer.…”

Section: Resultsmentioning

confidence: 99%

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Aluminum Anodization in Deionized Water as Electrolyte

Lisenkov

Poznyak

Zheludkevich

et al. 2016

J. Electrochem. Soc.

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Thin oxide films were prepared electrochemically on the aluminum surface using the high-voltage discharge and potentiostatic methods in deionized water as an electrolyte. The growth of continuous films occurred only at potentials lower than the breakdown potential. The films obtained by the discharge method are more uniform and can grow to a higher thickness in comparison to those formed by the potentiostatic mode, as demonstrated by electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), and scanning Kelvin probe force microscopy (SKPFM). The data herein obtained can be used as a reference to understand better the properties of the films produced in conventional electrolytes where apart from water other species are present.

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Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Aluminum Anodization in Deionized Water as Electrolyte

Lisenkov

Poznyak

Zheludkevich

et al. 2016

J. Electrochem. Soc.

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Surface Nanoarchitecture for Bio‐Applications: Self‐Regulating Intelligent Interfaces

Skorb

Andreeva

2013

Adv Funct Materials

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The surface nanoarchitecture provides spatially and temporally resolved stimuli response of the material, and offers defi ned control over the behavior of biomolecules and cells at the solid-liquid interface. Here, the focus is on metal-based systems that are interesting for biomedical applications. Intelligence of the surface is suggested to be achieved through its nanostructuring for stimuli responsive properties. Spatial and temporal cell performance at the surface, provided by the surface nanoarchitecture, offers advanced bio-applications of metal-based materials, such as implantation, lab-on-chip and organ-on-chip, biosensors, smart biomaterials and drug delivery systems. Spatial control is achieved by surface patterning. Temporal control is accessed through the application of stimuli responsive switchable surface chemistry, sensitive to external parameters: temperature, pH, light, electric and magnetic fi eld, ionic strength, surrounding medium (hydrogels in water), multi-trigger response, and response to products of the cell metabolism. The key issue is the prospect in the formation of self-regulating "intelligent" surface cell interactions: biomimetic of natural systems.

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