Fabricating Al2O3-nanopores array by an ultrahigh voltage two-step anodization technique: Investigating the effect of voltage rate and Al foil thickness on geometry and ordering of the array

Absalan, Ghodratollah; Barzegar, Sedigheh; Moradi, Mahmood; Behaein, Saeed

doi:10.1016/j.matchemphys.2017.07.015

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…The diameter of AAO pores depends on the anodization potential (voltage), temperature, electrolyte, and concentration [29,30]. The pore diameter and the distance between the pores often increase as the anodization voltage or the electrolyte concentration increases [14,31,32]. Moreover, it has recently been reported that the pore diameter decreases with decreasing electrolyte temperature [27].…”

Section: Introductionmentioning

confidence: 99%

Development and Analysis of Electrochemical Reactor with Vibrating Functional Element for AAO Nanoporous Membranes Fabrication

Cigane

Palevičius

Jurenas

et al. 2022

Sensors

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Nanoporous anodic aluminum oxide (AAO) is needed for a variety of purposes due to its unique properties, including high hardness, thermal stability, large surface area, and light weight. Nevertheless, the use of AAO in different applications is limited because of its brittleness. A new design of an electrochemical reactor with a vibrating element for AAO nanoporous membranes fabrication is proposed. The vibrating element in the form of a piezoceramic ring was installed inside the developed reactor, which allows to create a high-frequency excitation. Furthermore, mixing and vibration simulations in the novel reactor were carried out using ANSYS 17 and COMSOL Multiphysics 5.4 software, respectively. By theoretical calculations, the possibility to excite the vibrations of five resonant modes at different frequencies in the AAO membrane was shown. The theoretical results were experimentally confirmed. Five vibration modes at close to the theoretical frequencies were obtained in the novel reactor. Moreover, nanoporous AAO membranes were synthesized. The novel aluminum anodization technology results in AAO membranes with 82.6 ± 10 nm pore diameters and 43% porosity at 3.1 kHz frequency excitation and AAO membranes with 86.1 ± 10 nm pore diameters and 46% porosity at 4.1 kHz frequency excitation. Furthermore, the chemical composition of the membrane remained unchanged, and the hardness decreased. Nanoporous AAO has become less brittle but hard enough to be used for template synthesis.

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Section: Introductionmentioning

confidence: 99%

Development and Analysis of Electrochemical Reactor with Vibrating Functional Element for AAO Nanoporous Membranes Fabrication

Cigane

Palevičius

Jurenas

et al. 2022

Sensors

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confidence: 99%

Vibration Analysis of Nanoporous AAO Membrane by Using High-Frequency Excitation Technique in Electrochemical Reactor

Cigane¹,

Palevičius²

2023

World Congress on Recent Advances in Nanotechnology

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This article describes the research and development of nanoporous anodic aluminum oxide (AAO) membrane fabrication technology. There are many studies in the literature that analyse the dependence of the pore geometry of AAO on various parameters such as anodization time, temperature, type of electrolyte, concentration, etc [1][2][3][4]. However, control of the geometry of AAO nanopores using high-frequency excitation techniques during the anodization process is in the early stages of research, so no dependence has been established yet. Therefore, this paper presents a high-frequency excitation technique and a novel design of the electrochemical reactor that is designed to control the geometry of nanosized pores.Vibrations in the electrochemical reactor can be achieved using a piezoelectric ceramic material such as lead zirconate titanate (PZT), which has good electromechanical properties and can be used in the development of various devices [5]. An electrochemical reactor was developed to combine two processes (anodization and high-frequency excitation) in one technology.The theoretical and experimental results of the vibration analysis confirm that the developed electrochemical reactor can use the high-frequency excitation technique during the two-step anodization process. Using a precise real-time instrument for surface measurement (PRISM) holography system (Hytec, USA) [6], five resonant modes of different frequencies (from 2.2 to 10.7 kHz) have been achieved in the novel reactor. Moreover, AAO membranes were synthesized. The pore diameters were found between 28-96 nm. The results of this study reveal that the innovative electrochemical reactor meets the synthesis criteria and is suitable for the fabrication of nanopores.The results of this study will greatly contribute to the research and development of better quality nanoporous AAO membranes. Therefore, more research should focus on nanoporous AAO membrane fabrication by using the high-frequency excitation technique to find the dependence of the nanopore geometry at different frequencies.

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Review of nanomembranes: materials, fabrications and applications in tissue engineering (bone and skin) and drug delivery systems

2021

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Fabricating Al2O3-nanopores array by an ultrahigh voltage two-step anodization technique: Investigating the effect of voltage rate and Al foil thickness on geometry and ordering of the array

Cited by 6 publications

References 18 publications

Development and Analysis of Electrochemical Reactor with Vibrating Functional Element for AAO Nanoporous Membranes Fabrication

Development and Analysis of Electrochemical Reactor with Vibrating Functional Element for AAO Nanoporous Membranes Fabrication

Vibration Analysis of Nanoporous AAO Membrane by Using High-Frequency Excitation Technique in Electrochemical Reactor

Review of nanomembranes: materials, fabrications and applications in tissue engineering (bone and skin) and drug delivery systems

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