Special Issue "Layered Double Hydroxides: Nanoparticles, Hybrids and Nanocomposites"

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Nanotechnology and Applied Nanosciences".

Deadline for manuscript submissions: closed (31 December 2019) | Viewed by 3498

Special Issue Editors

Department of Materials Science and Engineering, Poly2 Group, Technical University of Catalonia (UPC BarcelonaTech), ESEIAAT, C/Colom 11, 08222 Terrassa, Spain
Interests: polymers; composites; foams; nanocomposites
Special Issues, Collections and Topics in MDPI journals
Department of Materials Science and Engineering, School of Industrial, Aerospace and Audiovisual Engineering (ESEIAAT), Universitat Politècnica de Catalunya (UPC BarcelonaTech), Terrassa Campus, Building TR5. C. Colom 11, E-08222 Terrassa, Barcelona, Spain
Interests: polymer clay nanocomposites; nanocomposite foams; multifunctional materials; flame retardancy of polymers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue focuses on the current state-of-the-art of the Layered Double Hydroxides, both from the points of view of its synthesis and characterization, as well as the development of hybrid and nanocomposite materials and their applications.

Layered double hydroxides (LDHs) or anionic clays can be seen as layered compounds with the brucite layer structure, which are derived from hydroxides of divalent cations by oxidation or cation replacement so that they produce an excess of positive electric charge, and the intercalation of extra anions between the hydroxide layers that neutralize that charge. LDHs can be formed with a wide variety of anions in the intercalated layers.

Layered double hydroxides (LDH), due to their unique properties as anion exchangers and their compositional versatility, among other factors, have attracted a great deal of attention in various technologically important fields, such as catalysis, separation, biomedicine, pharmacy, cosmetics, environment, etc. Recently, significant advances have been made in the synthesis of LDH with new compositions and morphologies that allow improved applications in these fields.

The compositional variation, either in layers or in interlayer anions, leads to a functional diversity that allows LDH to be used in a broad range of applications such as waste water treatment, ion exchanger, halogen free flame retardant, antacids, stabilizers for polymers, pharmaceuticals and agricultural goods, electro-photoactive materials, catalysts/catalyst precursors, etc. Among them, antimicrobial activity is one of the most promising applications of LDH, due to its high biocompatibility, high chemical stability, and ability to control the release of molecules.

Due to its laminar morphology and highly adjustable properties, LDH is an emerging class of materials for the preparation of multifunctional polymeric nanocomposites, which can exhibit unusual sets of properties, including high thermomechanical strength, barrier properties, flame retardancy, and ionic conduction, among others, while maintaining the overall performance and lightness of the polymer.

Articles are sought that summarize selected areas (reviews) or discuss the latest research in the field (original articles). The scope of this Special issue includes the synthesis and characterization of LDHs, their hybrids, and polymeric nanocomposites, as well as their applications.

Prof. Dr. José Ignacio Velasco
Dr. Vera Realinho
Guest Editors

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  • synthesis routes
  • layer and interlayer composition
  • hybrids
  • structural characterization
  • polymeric nanocomposites applications

Published Papers (1 paper)

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13 pages, 4386 KiB  
Designing Magnetic Layered Double Hydroxides and Two-Dimensional Magnetic Nano-Nets of Cobalt Ferrite through a Novel Approach
Appl. Sci. 2018, 8(11), 2099; https://doi.org/10.3390/app8112099 - 01 Nov 2018
Cited by 13 | Viewed by 3002
The present study has a dual aim of supporting magnetic nanoparticles over the nanolayers of LDHs and designing two-dimensional magnetic nano-nets of cobalt ferrite. In this trend, nanoparticles of CoFe2O4 were prepared and supported by Co-Fe LDH through urea hydrolysis. [...] Read more.
The present study has a dual aim of supporting magnetic nanoparticles over the nanolayers of LDHs and designing two-dimensional magnetic nano-nets of cobalt ferrite. In this trend, nanoparticles of CoFe2O4 were prepared and supported by Co-Fe LDH through urea hydrolysis. The nanolayered structures of Co-Fe LDH were confirmed by X-ray diffraction, energy-dispersive X-ray spectrometry, FT-IR spectra, thermal analyses, and transmission electron microscopy. In addition, they indicated that 13.2% CoFe2O4 were supported over Co-Fe LDH. Transformation of the nanolayered structures of Co-Fe LDH to nano-nets was achieved by the catalytic effect of the supported CoFe2O4 nanoparticles through solvent thermal technique. X-ray diffraction patterns and transmission electron microscopy images confirmed the transformation of the supported Co-Fe LDH to nano-nets of cobalt ferrite. In order to indicate the effect of the LDH for designing the nano-nets, nanoparticles of cobalt ferrite were prepared by the same technique without LDH. The magnetic behavior of the nano-nets and the supported Co-Fe LDH were measured and compared with the nanoparticles through vibrating sample magnetometer technique. The magnetic parameters indicated that the prepared nano-nets have ferromagnetic behavior and high coercivity. However, the prepared nanoparticles revealed a superparamagnetic state and low coercivity. The experimental results concluded that the incorporation of nanoparticles with nanowires into nano-net structures has been found to be an efficient way to improve their magnetic properties and prevent their agglomerations. Finally, layered double hydroxides are an important source for constructing magnetic nanolayered structures and nano-nets. Full article
(This article belongs to the Special Issue Layered Double Hydroxides: Nanoparticles, Hybrids and Nanocomposites)
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