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Minerals
Special Issues
Composites Based on Layered Silicate Minerals: Preparation, Characterization and Applications
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Composites Based on Layered Silicate Minerals: Preparation, Characterization and Applications

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Clays and Engineered Mineral Materials".

Deadline for manuscript submissions: closed (18 August 2023) | Viewed by 4540

Special Issue Editors

Dr. Mokhtar Adel

E-Mail Website
Guest Editor
1. Process Engineering Department, Faculty of Science and Technology, University of Relizane, Relizane 48000, Algeria
2. Material Chemistry Laboratory (LCM), Université Oran1, BP.1524 Oran El Menaouer, Oran 31100, Algeria
Interests: layered silicates; nanocomposites; catalysis; adsorption
Dr. Boukoussa Bouhadjar

E-Mail Website
Guest Editor
1. Material Chemistry Laboratory (LCM), Université Oran1, BP.1524 Oran El Menaouer, Oran 31100, Algeria
2. Department of Materials Engineering, Faculty of Chemistry, University of Sciences and Technology Mohamed Boudiaf, BP 1505, El-Mnaouer, Oran 31000, Algeria
Interests: porous materials; nanocomposites; catalysis; adsorption
Dr. Mohamed Abboud

E-Mail Website
Guest Editor
Catalysis Research Group (CRG), Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia
Interests: nanomaterials; mesoporous silica; nanocomposites; catalysis; water treatment

Special Issue Information

Dear Colleagues,

Layered silicates are natural materials that can be synthesized in a laboratory via hydrothermal synthesis. Compared to clay, these materials may have a higher ion exchange capacity and better chemical stability. The framework for these materials, predominantly comprising SiO4 tetrahedra, offer interesting properties through modifications of the SiOH/SiO interlayer groups.

The aim of this Special Issue is to bring together current articles concerning the extraction, characterization, identification of properties and the application of layered silicates as well as covering organic and inorganic modification; composite-layered silicate polymers; nanocomposite-layered silicate polymers; film and hydrogel composite-layered silicate polymers; their environmental applications for eliminating toxic substances (e.g., heavy metals, organic pollutants, and atmospheric and pathogenic bacteria); and their application in the pharmaceutical industry as active ingredients and/or to slow, extend or vectorize drug release.

Dr. Mokhtar Adel
Dr. Boukoussa Bouhadjar
Dr. Mohamed Abboud
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • layered silicate
  • metal-layered silicate nanocomposite
  • organic-layered silicate nanocomposite
  • polymer-layered silicate nanocomposite
  • layered silicate-based membrane
  • layered silicate-based hydrogel
  • sorbent-based layered silicate
  • atmospheric pollution
  • toxic substance removal
  • computer simulation
  • drug delivery

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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Research

Jump to: Review

20 pages, 4412 KiB  
Article
Gas Barrier Properties of Multilayer Polymer–Clay Nanocomposite Films: A Multiscale Simulation Approach
by Andrey Knizhnik, Pavel Komarov, Boris Potapkin, Denis Shirabaykin, Alexander Sinitsa and Sergey Trepalin
Minerals 2023, 13(9), 1151; https://doi.org/10.3390/min13091151 - 30 Aug 2023
Viewed by 1559
Abstract
The paper discusses the development of a multiscale computational model for predicting the permeability of multilayer protective films consisting of multiple polymeric and hybrid layers containing clay minerals as fillers. The presented approach combines three levels of computation: continuous, full atomic, and quantitative [...] Read more.
The paper discusses the development of a multiscale computational model for predicting the permeability of multilayer protective films consisting of multiple polymeric and hybrid layers containing clay minerals as fillers. The presented approach combines three levels of computation: continuous, full atomic, and quantitative structure–property correlations (QSPR). Oxygen and water are chosen as penetrant molecules. The main predictions are made using the continuum model, which takes into account the real scales of films and nanoparticles. It is shown that reliable predictions of the permeability coefficients can be obtained for oxygen molecules, which is not always possible for water. The latter requires the refinement of existing QSPR methods and interatomic interaction potentials for the atomistic level of calculations. Nevertheless, we show that the maximum effect on permeability reduction from the addition of clay fillers to the hybrid layer can be achieved by using nanoparticles with large aspect ratios and a high degree of orientational order. In addition, the use of the hybrid layer should be combined with the use of polymer layers with minimal oxygen and water permeability. The constructed model can be used to improve the properties of protective coatings for food and drug storage and to regulate the gas permeability of polymeric materials. Full article
(This article belongs to the Special Issue Composites Based on Layered Silicate Minerals: Preparation, Characterization and Applications)
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Figure 1

Figure 1
<p>Models of a barrier layer based on hybrid organic–inorganic multilayer films: (<b>a</b>) orientationally disordered filler particles and (<b>b</b>) laminate structure with orientationally ordered filler particles. Different colors of the layers schematically show the use of different materials for the formation of the multilayer protective films.</p> Full article ">Figure 2
<p>General scheme for calculating permeability using combined MD and GCMC modeling.</p> Full article ">Figure 3
<p>Chain models of selected polymers (<b>a</b>) polyethylene (PE), (<b>b</b>) polyvinylidene fluoride (PVDF), (<b>c</b>) polytetrafluoroethylene (PTFE), (<b>d</b>) polyethylene terephthalate (PET), and material samples built on their basis. The grey and blue colors in the simulation cells show the outer and inner sides of the Connolly surfaces constructed by rolling a test ball of radius 1A.</p> Full article ">Figure 4
<p>Calculated MSD curves obtained for (<b>a</b>) oxygen and (<b>b</b>) water molecules for PET, PE, PVDF, and PTFE at 300 K. Each curve is the result of averaging 10 MD runs. Dashed lines show the value of the diffusion coefficient estimated by a linear approximation.</p> Full article ">Figure 5
<p>Calculated dependencies of the number of (<b>a</b>) oxygen and (<b>b</b>) water molecules in the simulation cell <span class="html-italic">N</span><sub>cell</sub>(<span class="html-italic">p</span>) for the selected polymer materials PET, PE, PVDF, and PTFE obtained using the PCFF force field.</p> Full article ">Figure 6
<p>The calculated dependence of the ratio of the permeability of the polymer layer with fillers <span class="html-italic">P</span> to the permeability of a pure polymer layer <span class="html-italic">P</span><sub>p</sub> on the filler volume fraction with the aspect ratio of <span class="html-italic">α</span> = 60 at different values of the angle <span class="html-italic">θ</span><sub>max</sub> = 12.5°, 25°, and 45°.</p> Full article ">Figure 7
<p>Vapor permeability of the modified protective coating with a clay–polymer laminate layer as a function of the number of laminate bilayers for clay particle sizes of 1, 3, 10, and 30 µm.</p> Full article ">

Review

Jump to: Research

29 pages, 6049 KiB  
Review
Recent Advances in Antibacterial Metallic Species Supported on Montmorillonite Clay Mineral: A Review
by Adel Mokhtar, Abderrazzak Baba Ahmed, Boubekeur Asli, Bouhadjar Boukoussa, Mohammed Hachemaoui, Mohamed Sassi and Mohamed Abboud
Minerals 2023, 13(10), 1268; https://doi.org/10.3390/min13101268 - 28 Sep 2023
Cited by 7 | Viewed by 2332
Abstract
This review provides information on the latest advances in inorganic materials with antimicrobial properties based on a metallic species immobilized on the clay mineral montmorillonite realized between the years 2015 and 2023. This class has shown many promising results compared to certain organic [...] Read more.
This review provides information on the latest advances in inorganic materials with antimicrobial properties based on a metallic species immobilized on the clay mineral montmorillonite realized between the years 2015 and 2023. This class has shown many promising results compared to certain organic agents. Montmorillonite in natural and/or modified forms is a good platform for the storage and release of metallic species, and several researchers have worked on this mineral owing to its cation exchange capacity, low cost, biocompatibility, and local availability. The preparation methods and the properties such as the antibacterial, antifungal, and toxicological activities of this mineral are discussed. The main characteristics of this antibacterial class for the elimination of pathogenic bacteria were examined and the known weak points of its antimicrobial application are discussed, leading to suggestions for further research. Full article
(This article belongs to the Special Issue Composites Based on Layered Silicate Minerals: Preparation, Characterization and Applications)
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Figure 1

Figure 1
<p>Number of articles based on antibacterial metallic species supported on montmorillonite (based on Scopus database searches).</p> Full article ">Figure 2
<p>Structure of the Na–montmorillonite (2:1 type) of clay minerals.</p> Full article ">Figure 3
<p>Classification of antibacterial composite materials.</p> Full article ">Figure 4
<p>(<b>i</b>) Preparation methods; (<b>ii</b>,<b>iii</b>) TEM micrographs and histogram of metallic nanoparticle–montmorillonite hybrids. Reproduced with permission from [<a href="#B145-minerals-13-01268" class="html-bibr">145</a>].</p> Full article ">Figure 4 Cont.
<p>(<b>i</b>) Preparation methods; (<b>ii</b>,<b>iii</b>) TEM micrographs and histogram of metallic nanoparticle–montmorillonite hybrids. Reproduced with permission from [<a href="#B145-minerals-13-01268" class="html-bibr">145</a>].</p> Full article ">Figure 5
<p>(<b>i</b>) Preparation methods; (<b>ii</b>) TEM micrographs and histogram of zinc oxide–montmorillonite nanocomposite; (<b>iii</b>) zones of inhibition. Reproduced with permission from [<a href="#B148-minerals-13-01268" class="html-bibr">148</a>].</p> Full article ">Figure 5 Cont.
<p>(<b>i</b>) Preparation methods; (<b>ii</b>) TEM micrographs and histogram of zinc oxide–montmorillonite nanocomposite; (<b>iii</b>) zones of inhibition. Reproduced with permission from [<a href="#B148-minerals-13-01268" class="html-bibr">148</a>].</p> Full article ">Figure 6
<p>(<b>i</b>) XRD and (<b>ii</b>) TEM analyses of Ag–montmorillonite and Ag<sub>2</sub>CO<sub>3</sub>–montmorillonite nanocomposites. Reproduced with permission from [<a href="#B153-minerals-13-01268" class="html-bibr">153</a>].</p> Full article ">Figure 7
<p>(<b>i</b>) Elemental dot mapping of Al, Si, O, and Sn on the surface of montmorillonite. (<b>ii</b>) XPS spectrum of the SnO<sub>2</sub> nanoparticles. Reproduced with permission from [<a href="#B34-minerals-13-01268" class="html-bibr">34</a>].</p> Full article ">Figure 8
<p>Various applications of clay minerals.</p> Full article ">Figure 9
<p>Digital image of transparency/appearance, SEM image, and antibacterial tests of nanocomposite films based on montmorillonite. Reproduced with permission from [<a href="#B164-minerals-13-01268" class="html-bibr">164</a>].</p> Full article ">Figure 10
<p>Photographs of impregnated filter papers that were Fe<sup>3+</sup>-saturated or contained Na<sup>+</sup>–montmorillonite. Scanning electron micrograph showing <span class="html-italic">E. coli</span> cells retained on Fe<sup>3+</sup>-saturated montmorillonite-impregnated filter paper. Reproduced with permission from [<a href="#B176-minerals-13-01268" class="html-bibr">176</a>].</p> Full article ">Figure 11
<p>(<b>i</b>) Bacteriostatic ring experiment of nanocomposites of AgNPs@LEC-Mt with different silver content against the strains <span class="html-italic">E. coli</span> and <span class="html-italic">S. aureus</span>. Reproduced with permission from [<a href="#B178-minerals-13-01268" class="html-bibr">178</a>].</p> Full article ">Figure 12
<p>Schematic representation of the four plausible antibacterial mechanisms of the Ag–ZnO nanocomposite. Reproduced with permission from [<a href="#B193-minerals-13-01268" class="html-bibr">193</a>].</p> Full article ">
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