Morphology of Zn/Al layered double hydroxide nanosheets grown onto aluminum thin films

Scarpellini, D.; Falconi, Christian; Gaudio, P.; Mattoccia, A.; Medaglia, P. G.; Orsini, Andrea; Pizzoferrato, R.; Richetta, M.

doi:10.1016/j.mee.2014.07.007

Cited by 54 publications

(28 citation statements)

References 40 publications

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“…[1] Different kinds of guest anions, together with water molecules, occupy the interlamellar space to balance the excess positive charge of the hydroxide sheets, giving a layered hydrotalcite-like [M 2 + (1Àx) M 3 + x (OH) 2 ] [A nÀ x/n ] mH 2 O structure (Figure 1). [22][23][24] Moreover, the possibility of depositing well-adherent in-situ grown LDH films on metal substrates by a simple hydrothermal process [6,[25][26] could offer significant opportunities for the fabrication of functionalized 3D electrodes for advanced batteries. [22][23][24] Moreover, the possibility of depositing well-adherent in-situ grown LDH films on metal substrates by a simple hydrothermal process [6,[25][26] could offer significant opportunities for the fabrication of functionalized 3D electrodes for advanced batteries.…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

et al. 2018

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Zinc-aluminum layered double hydroxide (LDH) containing an ionic liquid, 1-butyl-3-methylimidazolium hydrogen sulfate (BmimSO 4 ), has been synthesized by a co-precipitation method. This strategy enabled the intercalation of the ionic liquid (IL) into the interlamellar space of LDH with the aim of increasing the ionic conductivity and reducing its dependence on water content. Pure and IL-intercalated LDHs have been characterized by Fourier-Transform Infrared (FTIR) spectroscopy and X-ray diffraction. Electrochemical Impedance Spectroscopy (EIS) measurements showed that the addition of IL enhanced the ionic conductivity of LDH by a factor of 15 at low humidity and by a factor of 9 at high humidity conditions. As a possible application, LDHs were dispersed as a guest filler in a composite anion exchange membrane (AEM) based on polysulfone-DABCO. In this case, the addition of IL remarkably improved the ionic conductivity of the membrane from 1.0 · 10 À9 to 2.4 · 10 À7 S/ cm at low humidity. At high humidity, the membranes reached a conductivity of 25 mS/cm at 25 8C in OH form. Stability tests of composite AEM confirmed the positive effect of LDH nanoparticles. Figure 1. Chemical formulas of a) LDH and b) 1-Butyl-3-methylimidazolium hydrogen sulfate (BmimSO 4 ).

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Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

et al. 2018

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“…A wide range of synthesis techniques can prepare (Zn, Al) LDH crystallites, because of their typical shape of nanosheets. Among these, we can mention the simple one‐step hydrothermal process at room temperature, in which one can use Zn salt precursors on Al sputtered thin substrates, or Al foils . In this case, the metal substrate (Al) acts as a support and reactant (forming a reservoir for the trivalent M 3+ cation).…”

Section: Introductionmentioning

confidence: 99%

Surface spectroscopy and structural analysis of nanostructured multifunctional (Zn, Al) layered double hydroxides

Richetta

Digiamberardino

Mattoccia

et al. 2016

Surface & Interface Analysis

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Two types of (Zn, Al) layered double hydroxide were prepared by a hydrothermal process at room temperature using Zn salt precursors on Al foils. The examined LDHs differ for the hosted anions in the interlamellar space, namely Cl À and NO 3 À . Scanning electron microscopy, X-ray photoelectron spectroscopy and ultraviolet photoemission spectroscopy have been used to characterize four types of the samples, representative of the two hosted anions (Cl À and NO 3 À ) and two times of growth (6 and 24 h). X-ray photoelectron spectroscopy results permitted to describe the interactions between inorganic anions hosted in the interlamellar space and the metallic cations on the brucite layer. They also allowed giving a tentative explanation of the different morphologies observed by scanning electron microscopy.

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“…There is only a broad peak in the range of [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] • which can be associated to presence of Al 2 O 3 in amorphous or nano-crystalline form. In contrast, the diffractogram of PEO-LDH-NO 3 shows well-defined peaks at 9.71…”

Section: Resultsmentioning

confidence: 99%

“…Ce 3+14 and 8-hydroxyquinoline 15 were used as corrosion inhibitors. Certain active protection effect was reported though the important issues related to uncontrollable release of inhibiting species were not considered.Recently, layered double hydroxides (LDH) have been widely investigated as environmentally-friendly containers for active corrosion protection of metals, in the form of conversion films [16][17][18][19] and as inhibiting pigments being incorporated into the polymer coatings. 20 The LDH particles offer a twofold effect of absorbing excess of chloride anions from the corrosive environment and releasing the corrosion inhibitors on demand.…”

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PEO Coatings with Active Protection Based on In-Situ Formed LDH-Nanocontainers

Serdechnova

Mohedano

Kuznetsov

et al. 2016

J. Electrochem. Soc.

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In the present work, for the first time Zn-Al layered double hydroxide (LDH) nanocontainers were grown in-situ on the surface and in the pores of plasma electrolytic oxidation (PEO) layer and then loaded with a corrosion inhibitor to provide active protection. The developed LDH-based conversion process ensures partial sealing of the pores and provides an effective corrosion inhibition on demand leading to increased fault-tolerance and self-healing properties. The structure, morphology and composition of the LDH-sealed PEO coatings on 2024 aluminum alloy were investigated using SEM, TEM/FIB, XRD and GDOES. Electrochemical impedance spectroscopy and scanning vibrating electrode techniques show a remarkable increase in the corrosion resistance and fault tolerance when PEO coating is sealed with a LDH-inhibitor treatment. Plasma electrolytic oxidation (PEO) is an advanced anodizing process which leads to the formation of ceramic-like coatings on the surface of many light alloys. The coatings form on the surface as a result of short-lived micro-discharges at high voltages in low-concentrated eco-friendly electrolytes.1 The oxide layers developed by PEO are usually hard, strongly-adherent to the substrate and confer both corrosion and wear resistance.2 The properties of PEO layers can be tuned for various applications such as biomedical, photocatalytic, thermal and decorative playing with composition of electrolytes and electrical parameters. [3][4][5] In spite of many advantages, the PEO coatings are usually composed of relatively porous layers as a result of discharge breakdowns and gas evolution during the coating growth. Such an intrinsic porosity of the layer often compromises the barrier properties of even relatively thick coatings. Moreover, the pores are larger as the coating thickness increases in many cases. Several attempts have been made to reduce or seal such porosity. Optimization of current/voltage regimes, 6,7 changing the electrolyte composition including systems with particles, 8,9 different post-treatments 10,11 and duplex coatings 12,13 were tried among other strategies. However, in spite of offering certain improvement to the barrier properties, none of these approaches ensures active protection. Without active protection, the acceptance of PEO coatings for many high demanding applications such as aeronautics is limited. In previous works, a post-treatment immersion of PEO coated Mg alloys into inhibitor containing solution was tried to achieve active protection. Ce 3+14 and 8-hydroxyquinoline 15 were used as corrosion inhibitors. Certain active protection effect was reported though the important issues related to uncontrollable release of inhibiting species were not considered.Recently, layered double hydroxides (LDH) have been widely investigated as environmentally-friendly containers for active corrosion protection of metals, in the form of conversion films [16][17][18][19] and as inhibiting pigments being incorporated into the polymer coatings. 20 The LDH particles offer a twofold effect of ab...

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Morphology of Zn/Al layered double hydroxide nanosheets grown onto aluminum thin films

Cited by 54 publications

References 40 publications

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

Layered Double Hydroxides Containing an Ionic Liquid: Ionic Conductivity and Use in Composite Anion Exchange Membranes

Surface spectroscopy and structural analysis of nanostructured multifunctional (Zn, Al) layered double hydroxides

PEO Coatings with Active Protection Based on In-Situ Formed LDH-Nanocontainers

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