2017/02/06 by Kaouther Abderrazek, Najoua Frini Srasra, Ezzeddine Srasra
Materials Science · #Layered Double Hydroxides Synthesis and Applications #Magnesium Oxide Properties and Applications #Thermal Expansion and Ionic Conductivity
paper · pdf · doi:10.1002/jccs.201600258
crossref issued 2017/02/06 · crossref published 2017/02/06 · crossref published-online 2017/02/06 · openalex publication_date 2017/02/06 · crossref created 2017/02/06 · crossref published-print 2017/03/01 · crossref deposited 2023/10/03 · openalex created_date 2025/10/10 · crossref indexed 2026/07/31 · openalex updated_date 2026/07/31
In this study, [Zn‐Al] layered double hydroxides ( LDHs ) were prepared using the coprecipitation method at constant pH . The synthesis parameters (including the aging time, synthesis pH , nature of the alkali, concentration of metallic salts, and the cationic molar ratio R = Zn/Al) were varied in order to elucidate their effect on the properties of the obtained materials. Different characterization techniques, namely X‐ray diffraction, Fourier transform infrared, thermogravimetric analysis‐differential thermogravimetry, transmission electron microscopy, energy‐dispersive X‐ray, inductively coupled plasma, and photoluminescence, were used in this study. It was found that obtaining well‐crystallized LDHs requires (i) an aging time of 24 h and (ii) a synthesis pH value in the range 8–12. Our results also show that the concentration of the cationic metallic salts has no influence on the structural properties of the LDHs . The use of NH 4 OH as alkali for adjusting the pH value during the synthesis favors the formation of nitrated LDH phases while NaOH gives rise to carbonated ones. Moreover, it was found that irrespective of the molar cationic ratio used (between 1 and 5), [Zn‐Al] LDHs could be obtained. The sample synthesized at R = 2 exhibited the best crystallinity.