Identification and Quantification of Defects in the Cation Ordering in Mg/Al Layered Double Hydroxides

2011 ◽  
Vol 23 (11) ◽  
pp. 2821-2831 ◽  
Author(s):  
Sylvian Cadars ◽  
Géraldine Layrac ◽  
Corine Gérardin ◽  
Michaël Deschamps ◽  
Jonathan R. Yates ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Cation Ordering ◽  
Double Hydroxides ◽  
Identification And Quantification

scholarly journals Cation Ordering and Superstructures in Natural Layered Double Hydroxides

2010 ◽  
Vol 64 (10) ◽  
pp. 730-735 ◽  
Author(s):  
Sergey V. Krivovichev ◽  
Victor N. Yakovenchuk ◽  
Andrey A. Zolotarev ◽  
Gregory N. Ivanyuk ◽  
Yakov A. Pakhomovsky
Keyword(s):  
Layered Double Hydroxides ◽  
Cation Ordering ◽  
Double Hydroxides

Interplay between Chemical Composition and Cation Ordering in the Magnetism of Ni/Fe Layered Double Hydroxides

2013 ◽  
Vol 52 (17) ◽  
pp. 10147-10157 ◽  
Author(s):  
Gonzalo Abellán ◽  
Eugenio Coronado ◽  
Carlos Martí-Gastaldo ◽  
Joao Waerenborgh ◽  
Antonio Ribera
Keyword(s):  
Chemical Composition ◽  
Layered Double Hydroxides ◽  
Cation Ordering ◽  
Double Hydroxides

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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