Surface Precipitation of Highly Porous Hydrotalcite-like Film on Al from a Zinc Aqueous Solution

Abstract

A hydrotalcite-like film has been successfully deposited on an Al-bearing glass substrate based on an interface reaction between an Al layer and a zinc aqueous solution. The film selectively grew on the Al surface but not on the glass surface. The film on Al was composed of layered nanosheets of a hydrotalcite-like compound containing Al and Zn. Comparably, deposits on the plastic surface and precipitates in solution were wurzite-type ZnO with various morphologies depending upon the preparation conditions. At low supersaturation degrees, single crystals and superstructures of Zn-Al hydrotalcite were also obtained. This porous hydrotalcite film has a potential application as catalyst supports, environmental materials, or matrixes for hydrotalcite-based nanocomposite films. Using Al as a reaction interface makes it easy to coat porous hydrotalcites on a series of matrix materials varying in shapes and properties, which is important for achieving practical applications. In addition, the method developed should be widely applicable to other systems for the preparation of porous or oriented hydrotalcite-like thin films by an appropriate combination of divalent/trivalent solution-substrate systems.

Fabrication of inhibitor anion-intercalated layered double hydroxide host films on aluminum alloy 2024 and their anticorrosion properties

“…Al2p peaks from the substrates are not present, suggesting that all the substrates have been completely covered. 31 The Al2p peaks slightly shift toward high binding energies with the intercalation of inhibitor anions.…”

In Situ Microstructure Control of Oriented Layered Double Hydroxide Monolayer Films with Curved Hexagonal Crystals as Superhydrophobic Materials

“…During the writing of this manuscript, Gao et al reported the preparation of a ZnAl-LDH film that does not have any regular orientation on the substrate, using a similar method but without further studying its functional properties. [24] The NiAl-LDH film samples were synthesized under controlled hydrothermal conditions at 120°C for 36 h. Figure 1 illustrates the X-ray diffraction (XRD) pattern of the NiAl-LDH film, as well as the XRD patterns of the PAO/Al substrate and the LDH powder scraped from the film sample for comparison.…”

Formation of Zn–Al layered double hydroxide thin films intercalated with sulfonated spiropyran

“…For example, suspension of exfoliated LDH nanosheets or nanocrystals are used for coating [4][5][6][7][8]. Formation of Zn-Al LDH thin films on porous anodic alumina/Al substrate or alumina gel films with a reaction of Zn sources has also been reported [9]. We formed Zn-Al LDH thin films intercalated with carbonate anions directly by immersion of sol-gel derived amorphous Al 2 O 3 -ZnO thin films on glass substrates in hot distilled water [10,11].…”

“…However, for application of LDH to functional materials and for evaluation of their optical properties or intercalation reaction of LDH crystals, formation of LDH thin films on substrates is favorable. As a matter of fact, many recent reports have described formation of LDH thin films [4][5][6][7][8][9][10][11][12][13]. For example, suspension of exfoliated LDH nanosheets or nanocrystals are used for coating [4][5][6][7][8].…”