Evaluation of self-healing ability in protective coatings modified with combinations of layered double hydroxides and cerium molibdate nanocontainers filled with corrosion inhibitors

2012 ◽  
Vol 60 ◽  
pp. 31-40 ◽  
Author(s):  
M.F. Montemor ◽  
D.V. Snihirova ◽  
M.G. Taryba ◽  
S.V. Lamaka ◽  
I.A. Kartsonakis ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Corrosion Inhibitors ◽  
Protective Coatings ◽  
Self Healing ◽  
Double Hydroxides

Microencapsulation: an emerging technique in the modern coating industry

RSC Advances ◽  
2016 ◽  
Vol 6 (108) ◽  
pp. 106964-106979 ◽  
Author(s):  
Kunal Wazarkar ◽  
Deepak Patil ◽  
Ajay Rane ◽  
Dinesh Balgude ◽  
Mukesh Kathalewar ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Protective Coatings ◽  
Sol Gel ◽  
Self Healing ◽  
The Past ◽  
Coating Industry

The protection of metal from corrosion is of great interest for which various methods have been implemented in the past such as organic–inorganic protective coatings, use of corrosion inhibitors, sol–gel coatings, self healing coatingsetc.

Zn–Al layered double hydroxides as chloride nanotraps in active protective coatings

2012 ◽  
Vol 55 ◽  
pp. 1-4 ◽  
Author(s):  
J. Tedim ◽  
A. Kuznetsova ◽  
A.N. Salak ◽  
F. Montemor ◽  
D. Snihirova ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Protective Coatings ◽  
Double Hydroxides

Effect of layered double hydroxides addition on the ageing and self-healing properties of asphalt binder

2019 ◽  
Vol 6 (7) ◽  
pp. 075704 ◽  
Author(s):  
Shiwen Bao ◽  
Quantao Liu ◽  
José Norambuena-Contreras ◽  
Zengfeng Wang ◽  
Shaopeng Wu
Keyword(s):  
Layered Double Hydroxides ◽  
Asphalt Binder ◽  
Self Healing ◽  
Double Hydroxides

Enhanced protective coatings on Ti-10V-2Fe-3Al alloy through anodizing and post-sealing with layered double hydroxides

2020 ◽  
Vol 37 ◽  
pp. 104-113 ◽  
Author(s):  
Lei Liu ◽  
Liang Wu ◽  
Xiaobo Chen ◽  
Deen Sun ◽  
Yuan Chen ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Protective Coatings ◽  
Double Hydroxides

scholarly journals Performance Evaluation of Layered Double Hydroxides Containing Benzotriazole and Nitrogen Oxides as Autonomic Protection Particles against Corrosion

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Alana Cristine Pellanda ◽  
Alexandre Gonçalves Cordeiro Neto ◽  
Agne Roani de Carvalho Jorge ◽  
Marcos Antonio Coelho Berton ◽  
João Batista Floriano ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Nitrogen Oxides ◽  
Ion Exchange ◽  
Layered Double Hydroxides ◽  
Electrochemical Impedance ◽  
Exchange Capacity ◽  
Open Circuit ◽  
Self Healing ◽  
Ion Exchange Capacity ◽  
Double Hydroxides

Layered double hydroxides (LDH) are lamellar structures with positively charged laminates and charge-compensating interlayer anions. The ion-exchange capacity of LDHs makes them as promising hosts for corrosion inhibitor anions with stimulus-responsive release and self-healing anticorrosion. In the current work, LDHs loaded with two different corrosion inhibitors (nitrogen oxides and benzotriazole) were evaluated for their ion-exchange capacity and autonomic protection against corrosion on carbon steel. Studies on nitrogen oxide-loaded LDH (NOx-LDH) showed that nitrogen oxides were successfully intercalated in LDH structure, which were released in chloride media. Open Circuit Potential (OCP) results showed that NOx-LDH extract shifted OCP to nobler values, indicating the protection of metal. For benzotriazole-loaded LDH (BTZ-LDH), the results indicated the presence of benzotriazole in the structure, but its release was not observed. OCP results showed no significant increase of carbon steel protection, corroborating with the conclusion that benzotriazole ions did not migrate to metal surface. Considering these results, the insertion of NOx-LDH in an automotive primer was proceeded, under three different concentrations (0.2. 1.0, and 3.0%). Electrochemical impedance spectroscopy (EIS) showed that the more effective NOx-LDH concentration on corrosion delay was 0.2%, which better balanced protection level conferred by LDH with a possible loss on effectiveness of coating due to increase in porosity.

Acceptorless amine dehydrogenation and transamination using Pd-doped layered double hydroxides

2018 ◽  
Author(s):  
Diana Ainembabazi ◽  
Nan An ◽  
Jinesh Manayil ◽  
Kare Wilson ◽  
Adam Lee ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Oxidation States ◽  
Secondary Amines ◽  
Primary Amines ◽  
Acid Dissolution ◽  
Oxidative Amination ◽  
Strong Function ◽  
Excellent Activity ◽  
High Yields ◽  
Double Hydroxides

<div> <p>The synthesis, characterization, and activity of Pd-doped layered double hydroxides (Pd-LDHs) for for acceptorless amine dehydrogenation is reported. These multifunctional catalysts comprise Brønsted basic and Lewis acidic surface sites that stabilize Pd species in 0, 2+, and 4+ oxidation states. Pd speciation and corresponding cataytic performance is a strong function of metal loading. Excellent activity is observed for the oxidative transamination of primary amines and acceptorless dehydrogenation of secondary amines to secondary imines using a low Pd loading (0.5 mol%), without the need for oxidants. N-heterocycles, such as indoline, 1,2,3,4-tetrahydroquinoline, and piperidine, are dehydrogenated to the corresponding aromatics with high yields. The relative yields of secondary imines are proportional to the calculated free energy of reaction, while yields for oxidative amination correlate with the electrophilicity of primary imine intermediates. Reversible amine dehydrogenation and imine hydrogenation determine the relative imine:amine selectivity. Poisoning tests evidence that Pd-LDHs operate heterogeneously, with negligible metal leaching; catalysts can be regenerated by acid dissolution and re-precipitation.</p> </div> <br>

Antibiotic-anionic Clay Matrix Used for Drug Controlled Release

2018 ◽  
Vol 69 (2) ◽  
pp. 321-323
Author(s):  
Georgeta Zegan ◽  
Elena Mihaela Carausu ◽  
Loredana Golovcencu ◽  
Alina Sodor Botezatu ◽  
Eduard Radu Cernei ◽  
...  
Keyword(s):  
Controlled Release ◽  
Layered Double Hydroxides ◽  
Bioactive Molecules ◽  
Drug Controlled Release ◽  
Anionic Clays ◽  
Anionic Clay ◽  
Toxicological Studies ◽  
High Efficient ◽  
Clay Matrix ◽  
Double Hydroxides

Anionic clay matrix acting as drug controlled release system have shown in last years a great potential for delivery of bioactive molecules and chemical therapeutics. This organic-inorganic nanohybrid system is high efficient offering an excellent protection of intercalated compounds from degradation. Compared to other nanoparticles used in medical area, anionic clays type layered double hydroxides have found to be biocompatible according to toxicological studies. Ampicillin containing MgAlLDHs and ZnAlLDH samples have been prepared following two routes: anion-exchange procedure and reconstruction from calcined layered double hydroxides. Solid samples have been characterized by FTIR and SEM-EDX highlighting the alteration of pristine LDHs structure when the antibiotic is introduced in the interlayer gallery.

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