Fabrication of superhydrophobic layered double hydroxide composites to enhance the corrosion-resistant performances of epoxy coatings on Mg alloy

Cao, Kunyao; Yu, Zongxue; Zhu, Lijuan; Yin, Di; Chen, Legang; Jiang, Yong; Wang, Juan

doi:10.1016/j.surfcoat.2020.126763

Cited by 40 publications

(17 citation statements)

References 57 publications

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“…The release of Mg 2+ and Al 3+ ions from the substrate during dissolution provides a necessary supply of cations for the formation of the cationic layer [ 207 ]. These cations occupy the octahedral holes in the brucite Mg(OH) 2 layer, and interlayer anions intercalate such cationic layers to balance the charge [ 208 ]. In the presence of corrosive media, the anions in the double layer structure are replaced by the aggressive anions (such as Cl − ), and anion exchangeability is decided by anion exchange equilibrium constants of various LDH anions in the order: CO 3 2− > SO 4 2− > OH − > F − > Cl − > Br − > NO 3 − > I − [ 208 ].…”

Section: Coatings and Their Current Statusmentioning

confidence: 99%

“…These cations occupy the octahedral holes in the brucite Mg(OH) 2 layer, and interlayer anions intercalate such cationic layers to balance the charge [ 208 ]. In the presence of corrosive media, the anions in the double layer structure are replaced by the aggressive anions (such as Cl − ), and anion exchangeability is decided by anion exchange equilibrium constants of various LDH anions in the order: CO 3 2− > SO 4 2− > OH − > F − > Cl − > Br − > NO 3 − > I − [ 208 ]. The significant capturing of Cl − ions reduces aggressive ions in corrosive media.…”

Section: Coatings and Their Current Statusmentioning

confidence: 99%

See 1 more Smart Citation

Progress in bioactive surface coatings on biodegradable Mg alloys: A critical review towards clinical translation

Singh

Batra

Kumar

et al. 2023

Bioactive Materials

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Section: Coatings and Their Current Statusmentioning

confidence: 99%

Section: Coatings and Their Current Statusmentioning

confidence: 99%

Progress in bioactive surface coatings on biodegradable Mg alloys: A critical review towards clinical translation

Singh

Batra

Kumar

et al. 2023

Bioactive Materials

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“…The most effective way to deepen and develop research is to enhance the toughness and anti-corrosion performance of epoxy resin by adding nanomaterials to the epoxy resin coating. There are plenty of types of nanomaterials that have been extensively modified for the mechanical and anti-corrosion properties of epoxy resins, such as carbon nanotubes (CNT), 10,11 halloysite nanotubes (HNT), [12][13][14] layer double hydroxide (LDH), [15][16][17] graphene, 18,19 nano silica particles, 20,21 and sepiolite. 22,23 Metal organic frameworks (MOFs), composed of the metal ions as a precursor and organic compounds as ligands, are called the new class of nano porous materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and anticorrosion properties of GO‐Ce‐MOF nanocomposite coatings

Chen

Yin

et al. 2021

J of Applied Polymer Sci

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Herein, a new strategy for improving epoxy coatings' anti-corrosion performance has been developed, which combined NH 2 -Ce-MOF with graphene oxide (GO) by hydrothermal method. First, the nanocomposite material's morphology and structure (GO-Ce-MOF) were confirmed by Fourier transform infrared, X-ray diffraction, TG, X-ray photoelectron spectroscopy, and scanning electron microscope (SEM) studies. The dispersity of the composite in the epoxy coating was evaluated by SEM and mapping analysis. Meanwhile, the anti-corrosion of as-prepared composite coatings was investigated in detail by the electrochemical impedance spectroscopy (EIS) and the Tafel polarization curve test. The results illustrated that 2.0 wt% GO-Ce-MOF/EP greatly enhanced the composite coating's anti-corrosion performance compared to other coatings. The reasons for the improvement of the anti-corrosion performance of the composite coating are attributed to the following two aspects: On the one hand, the addition of GO can provide a physical barrier to form a labyrinth effect to slow down the invasion of corrosive media into the metal substrate, on the other hand, the modification of GO can GO-Ce-MOF achieve better compatibility and dispersion in epoxy resin.

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“…LDHs are very versatile for different technological applications, in particular biological and chemical ones [21], primarily due to their layered structure, which allows for hosting even complex organic molecules, such as drugs and biomolecules, that are intercalated in the large interlayer space with wide flexibility regarding the composition and functionalization [22][23][24][25][26][27][28]. Moreover, there is currently an increasing interest in LDHs due to their properties as heterogeneous catalysts and supports for molecular catalysts [29][30][31] or photocatalysis [32], for fabrication of superhydrophobic surfaces [33,34], water treatment and remediation [35][36][37] and ion-exchanger membranes [38,39]. Interestingly, anion conductivity in LDHs can be modulated by incorporating different anions in the interlayer space, allowing for their use as sensors [40][41][42][43][44] or as fillers in different electrochemical applications, such as fuel cells, supercapacitors and water splitting [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, there is currently an increasing interest in LDHs due to their properties as heterogeneous catalysts and supports for molecular catalysts [29][30][31] or photocatalysis [32], for fabrication of superhydrophobic surfaces [33,34], water treatment and remediation [35][36][37] and ion-exchanger membranes [38,39]. Interestingly, anion conductivity in LDHs can be modulated by incorporating different anions in the interlayer space, allowing for their use as sensors [40][41][42][43][44] or as fillers in different electrochemical applications, such as fuel cells, supercapacitors and water splitting [45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxides as a Drug Delivery Vehicle for S-Allyl-Mercapto-Cysteine (SAMC)

et al. 2021

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The intercalations of anionic molecules and drugs in layered double hydroxides (LDHs) have been intensively investigated in recent years. Due to their properties, such as versatility in chemical composition, good biocompatibility, high density and protection of loaded drugs, LDHs seem very promising nanosized systems for drug delivery. In this work, we report the intercalation of S-allyl-mercapto-cysteine (SAMC), which is a component of garlic that is well-known for its anti-tumor properties, inside ZnAl-LDH (hereafter LDH) nanostructured crystals. In order to investigate the efficacy of the intercalation and drug delivery of SAMC, the intercalated compounds were characterized using X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The increase in the interlayer distance of LDH from 8.9 Å, typical of the nitrate phase, to 13.9 Å indicated the intercalation of SAMC, which was also confirmed using FT-IR spectra. Indeed, compared to that of the pristine LDH precursor, the spectrum of LDH-SAMC was richly structured in the fingerprint region below 1300 cm−1, whose peaks corresponded to those of the functional groups in the SAMC molecular anion. The LDH-SAMC empirical formula, obtained from UV-Vis spectrophotometry and thermogravimetric analysis, was [Zn0.67Al0.33(OH)2]SAMC0.15(NO3)0.18·0.6H2O. The morphology of the sample was investigated using SEM: LDH-SAMC exhibited a more irregular size and shape of the flake-like crystals in comparison with the pristine LDH, with a reduction in the average crystallite size from 3 µm to about 2 µm. In vitro drug release studies were performed in a phosphate buffer solution at pH 7.2 and 37 °C and were analyzed using UV-Vis spectrophotometry. The SAMC release from LDH-SAMC was initially characterized by a burst effect in the first four hours, during which, 32% of the SAMC is released. Subsequently, the release percentage increased at a slower rate until 42% after 48 h; then it stabilized at 43% and remained constant for the remaining period of the investigation. The LDH-SAMC complex that was developed in this study showed the improved efficacy of the action of SAMC in reducing the invasive capacity of a human hepatoma cell line.

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Fabrication of superhydrophobic layered double hydroxide composites to enhance the corrosion-resistant performances of epoxy coatings on Mg alloy

Cited by 40 publications

References 57 publications

Progress in bioactive surface coatings on biodegradable Mg alloys: A critical review towards clinical translation

Progress in bioactive surface coatings on biodegradable Mg alloys: A critical review towards clinical translation

Preparation and anticorrosion properties of GO‐Ce‐MOF nanocomposite coatings

Layered Double Hydroxides as a Drug Delivery Vehicle for S-Allyl-Mercapto-Cysteine (SAMC)

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