Carbonate-Free Zn-Al (1:1) Layered Double Hydroxide Film Directly Grown on Zinc-Aluminum Alloy Coating

Salak, A. N.; Lisenkov, Aleksey D.; Zheludkevich, Mikhail L.; Ferreira, M. G. S.

doi:10.1149/2.008401eel

Cited by 23 publications

(15 citation statements)

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“…Other factors that determine selectivity may include the interaction of anions with the OH surface of host layers in interlayer space and interlayer water molecules. [38,39] NO 3 -ions in the interlayer space in a flat orientation at a high Mg/Al ratio would be in a highly stabilized state due to their preferable size and the strong interaction among NO 3 -ions, the LDH host layers, and interlayer water. That interaction would be similar to hydrogen bonds, as suggested in simulation studies, [20] and the shape and size of the NO 3 -anion would significantly affect such an interaction.…”

Section: Discussionmentioning

confidence: 99%

Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

Hibino

2018

Eur J Inorg Chem

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Layered double hydroxides (LDHs) have long been thought to have low selectivity for NO 3 -. In contrast, it has recently been reported that LDHs with certain compositions show high selectivity for NO 3 -. The reason for the high selectivity has been unclear, although the ion sieve effect has been proposed as a possible mechanism. Moreover, small LDHs have been reported to show good anion exchanging ability. Given this background, a systematic study was conducted using Mg-Al LDHs with two different crystallinities. High-crystallinity LDHs with lager particle sizes clearly showed selectivity changes that de-

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Section: Discussionmentioning

confidence: 99%

Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

Hibino

2018

Eur J Inorg Chem

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“…In their capacity of exchangers and adsorbents, LDHs are extensively used as (nano)containers for delivery of drugs, genes and markers in vivo [11][12][13][14], active pigments in coatings for corrosion protection [15][16][17], agents in the systems for water purification [18][19][20] and in other areas. In such applications, the nature of cations M 2+ and M 3+ is disregarded (except for apparent aspects of low cost and ecological compatibility), since in respect of anion-exchange properties the M 2+ /M 3+ ratio is only important since it entirely determines the layer charge per unit cell [21].…”

Section: Introductionmentioning

confidence: 99%

High-Power Ultrasonic Synthesis and Magnetic-Field-Assisted Arrangement of Nanosized Crystallites of Cobalt-Containing Layered Double Hydroxides

et al. 2019

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High-quality stoichiometric Co2Al–NO3 and Co2Al–CO3 layered double hydroxides (LDHs) have been obtained by precipitation followed by anion exchange, both high-power-sonication assisted. Application of high-power ultrasound has been demonstrated to result in a considerable acceleration of the crystallization process and the anion-exchange reaction. Two independent approaches were used to form bulk and 2-D samples of Co2Al–NO3 with the oriented crystallites, namely uniaxial pressing of deposits from sonicated LDH slurries and magnetic field-assisted arrangement of LDH crystallites precipitating on glass substrates. A convenient way of preparation of semi-transparent compacts with relatively big blocks of oriented crystallites have been demonstrated. Thin dense transparent films of highly-ordered crystallites of Co2Al–NO3 LDH have been produced and characterized.

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“…The lattice parameters a and c can be independently calculated from the angle positions of the (110) diffraction reflection and the (00 l) reflections family, respectively. When LDH are intercalated with single-atom anions or with some other simple anions that are arranged parallel to the hydroxide layers, the crystal symmetry is known (e.g., R3m for Zn-Al and Mg-Al LDH intercalated with Cl − [6], OH − [7], CO 2 2− [8]. However, in the cases of large polyatomic anions [9], the real symmetry of the crystal lattice can be lower than rhombohedral or still rhombohedral but with a higher value of a-parameter.…”

Section: Introductionmentioning

confidence: 99%

Bi-substituted Mg3Al–CO3 layered double hydroxides

Sokol

Salak

Ferreira

et al. 2017

J Sol-Gel Sci Technol

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Magnesium-aluminium-bismuth-layered double hydroxides (LDH) intercalated with carbonate were studied in respect of maximal rate of substitution of Al 3+ by Bi 3+ for the first time. LDH with the nominal compositions of Mg 3 Al 1x Bi x -CO 3 (x = 0 to 0.5) were prepared using both the conventional super saturation co-precipitation method and sol-gel processing via hydration of the mixed oxide powders in carbonate-containing solutions. The mixed oxides were obtained either by calcination of the LDH (prepared by co-precipitation) or by using a novel alkoxide-free sol-gel method. All the LDH products were characterised using the methods of X-ray diffraction, scanning electron microscopy and thermogravimetry. The observed values of the lattice parameters of LDH phases were compared with the calculated values. It has been found that, regardless of the preparation method used and the conditions (pH, temperature, time) applied, the maximum rate of substitution of aluminium by bismuth in LDH is about 20 mol.%.Graphical abstract A schematic representation of LDH structure of a 3R polytype [4,5] where the lattice parameter c and the basal spacing d relate to each other as c = 3d.

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Carbonate-Free Zn-Al (1:1) Layered Double Hydroxide Film Directly Grown on Zinc-Aluminum Alloy Coating

Cited by 23 publications

References 0 publications

Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

Anion Selectivity of Layered Double Hydroxides: Effects of Crystallinity and Charge Density

High-Power Ultrasonic Synthesis and Magnetic-Field-Assisted Arrangement of Nanosized Crystallites of Cobalt-Containing Layered Double Hydroxides

Bi-substituted Mg3Al–CO3 layered double hydroxides

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