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Organic-Inorganic Hybrids: The New Frontier for Advanced Functional Materials

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 12717

Special Issue Editors


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Guest Editor
Department of Applied Science and Technology and INSTM Unit of Torino - Politecnico, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
Interests: (photo)reforming; chemical synthesis; nanocomposites; thin films; surface properties; zeolites
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Guest Editor
Department of Civil and Mechanical Engineering and INSTM Research Unit, Università degli Studi di Cassino e del Lazio Meridionale, Via G. Di Biasio 43, 03043 Cassino, FR, Italy
Interests: Nanoparticles; Materials Processing; Materials; Material Characterization; Wastewater; Treatment‘; Adsorption; Nanomaterials; Nanomaterials Synthesis; Nanoparticle Synthesis; Nanostructured Materials

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Assistant Guest Editor
DISAT - Department of Applied Science and Technology, Politecnico di Torino, Turin, Italy
Interests: Microfluidics , Multi-modal imaging, Theranostic, Hybrid Nanosystems, Preparation of metallorganic-based materials, Synthesis of oxide-based catalysts, UV-VIS spectroscopy, Electron Microscopy, Nitrogen adsorption measurement

Special Issue Information

Dear Colleagues,

Organic–inorganic hybrid materials arise from the integration of organic and inorganic matrices and they can be classified according to the mutual interactions at the molecular level, as proposed by Prof. Clement Sanchez. The synergic characteristics and functionalities with respect to the single component make hybrids a potential platform for multidisciplinary applications. The challenges and opportunities offered by topic of hybrid materials are strongly correlated with the synthesis strategies adopted. In this area, recent efforts have focused on increasing the advantages and reduce the limitations of the two counterparts. Many approaches have been proposed to go beyond mechanical strength and thermal and chemical stability to prepare highly versatile functional materials with improved optical and electrical properties, energy conversion capability, luminescence ionic conductivity and biochemical activity

The “soft chemistry” behind the sol-gel method is a potential tool to produce smart materials thanks to unique features, with perfect control over size, composition, functionality, and morphology. Organically modified silicates (ormosil) are by far the most employed precursors for the preparation of hybrid materials and the large variety of commercially available ormosil precursors offers numerous opportunities to design new functional materials.

This Special Issue will provide a forum for scientists working on both synthesis strategies and characterization for the development of advanced hybrid materials. Papers reporting the performance of new nanohybrids in any field of materials science (catalysis and biocatalysis, sensing, biomedical applications, etc.) are welcome.

The control of the organic-inorganic interface and the correlation between the synthesis procedure and the interface properties cannot be ignored. For this reason, works concerning the use of modern tools, such as (DOSY) NMR, SAXS, and WAXS, to evaluate the hybrid interfaces and self-assembly processes are also encouraged.

Dr. Serena Esposito
Prof. Dr. Michele Pansini
Guest Editors

Dr. Olimpia Tammaro
Assistant Guest Editor

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Keywords

  • Sol-gel routes for hybrids
  • Nanomaterials
  • Mesoporous materials
  • Hybrids characterization
  • Catalytic active hybrid materials
  • Biocatalysis
  • Polymer-inorganic nano-hybrids
  • Enzyme stabilization
  • Hierarchical structures of hybrid materials

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Published Papers (3 papers)

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26 pages, 2303 KiB  
Review
Roles of Organic Fragments in Redirecting Crystal/Molecular Structures of Inorganic–Organic Hybrids Based on Lacunary Keggin-Type Polyoxometalates
by Ruhollah Khajavian, Vida Jodaian, Fatemeh Taghipour, Joel T. Mague and Masoud Mirzaei
Molecules 2021, 26(19), 5994; https://doi.org/10.3390/molecules26195994 - 2 Oct 2021
Cited by 6 | Viewed by 3557
Abstract
Lacunary polyoxometalates (LPOMs) are key precursors for the synthesis of functional POMs. To date, reviews dedicated to behavioral studies of LPOMs often comprise the role of metal ions, including transition metal (TM) and rare earth (RE) ions, in extending and stability of high-nuclearity [...] Read more.
Lacunary polyoxometalates (LPOMs) are key precursors for the synthesis of functional POMs. To date, reviews dedicated to behavioral studies of LPOMs often comprise the role of metal ions, including transition metal (TM) and rare earth (RE) ions, in extending and stability of high-nuclearity clusters. In contrast, the role of organic ligands in the structures and properties of lacunary-based hybrids has remained less explored. In this review, we focus on the role of organic fragments in the self-assembling process of POM-based architectures and discuss relationships between the nature and structure of organic ligand and properties such as the topology of hybrid inorganic–organic material in RE and TM-RE heterometallic derivatives of lacunary Keggin-type POMs. The effects of organic fragment in mixed ligand hybrids are also briefly reviewed. Full article
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18 pages, 3033 KiB  
Article
Silica Meets Tannic Acid: Designing Green Nanoplatforms for Environment Preservation
by Fabiana Tescione, Olimpia Tammaro, Aurelio Bifulco, Giovanni Del Monaco, Serena Esposito, Michele Pansini, Brigida Silvestri and Aniello Costantini
Molecules 2022, 27(6), 1944; https://doi.org/10.3390/molecules27061944 - 17 Mar 2022
Cited by 13 | Viewed by 3882
Abstract
Hybrid tannic acid-silica-based porous nanoparticles, TA-SiO2 NPs, have been synthesized under mild conditions in the presence of green and renewable tannic acid biopolymer, a glycoside polymer of gallic acid present in a large part of plants. Tannic acid (TA) was exploited as [...] Read more.
Hybrid tannic acid-silica-based porous nanoparticles, TA-SiO2 NPs, have been synthesized under mild conditions in the presence of green and renewable tannic acid biopolymer, a glycoside polymer of gallic acid present in a large part of plants. Tannic acid (TA) was exploited as both a structuring directing agent and green chelating site for heavy metal ions recovery from aqueous solutions. Particles morphologies and porosity were easily tuned by varying the TA initial amount. The sample produced with the largest TA amount showed a specific surface area an order of magnitude larger than silica nanoparticles. The adsorption performance was investigated by using TA-SiO2 NPs as adsorbents for copper (II) ions from an aqueous solution. The effects of the initial Cu2+ ions concentration and the pH values on the adsorption capability were also investigated. The resulting TA-SiO2 NPs exhibited a different adsorption behaviour towards Cu2+, which was demonstrated through different tests. The largest adsorption (i.e., ~50 wt% of the initial Cu2+ amount) was obtained with the more porous nanoplatforms bearing a higher final TA content. The TA-nanoplatforms, stable in pH value around neutral conditions, can be easily produced and their use would well comply with a green strategy to reduce wastewater pollution. Full article
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20 pages, 3235 KiB  
Article
Dual Spinneret Electrospun Polyurethane/PVA-Gelatin Nanofibrous Scaffolds Containing Cinnamon Essential Oil and Nanoceria for Chronic Diabetic Wound Healing: Preparation, Physicochemical Characterization and In-Vitro Evaluation
by Mohamed Ahmed Mohamady Hussein, Oguzhan Gunduz, Ali Sahin, Mariusz Grinholc, Ibrahim Mohamed El-Sherbiny and Mosaad Megahed
Molecules 2022, 27(7), 2146; https://doi.org/10.3390/molecules27072146 - 26 Mar 2022
Cited by 29 | Viewed by 4424
Abstract
In this study, a dual spinneret electrospinning technique was applied to fabricate a series of polyurethane (PU) and polyvinyl alcohol–gelatin (PVA/Gel) nanofibrous scaffolds. The study aims to enhance the properties of PU/PVA-Gel NFs loaded with a low dose of nanoceria through the incorporation [...] Read more.
In this study, a dual spinneret electrospinning technique was applied to fabricate a series of polyurethane (PU) and polyvinyl alcohol–gelatin (PVA/Gel) nanofibrous scaffolds. The study aims to enhance the properties of PU/PVA-Gel NFs loaded with a low dose of nanoceria through the incorporation of cinnamon essential oil (CEO). The as-prepared nCeO2 were embedded into the PVA/Gel nanofibrous layer, where the cinnamon essential oil (CEO) was incorporated into the PU nanofibrous layer. The morphology, thermal stability, mechanical properties, and chemical composition of the produced NF mats were investigated by STEM, DSC, and FTIR. The obtained results showed improvement in the mechanical, and thermal stability of the dual-fiber scaffolds by adding CEO along with nanoceria. The cytotoxicity evaluation revealed that the incorporation of CEO to PU/PVA-Gel loaded with a low dose of nanoceria could enhance the cell population compared to using pure PU/PVA-Gel NFs. Moreover, the presence of CEO could inhibit the growth rate of S. aureus more than E. coli. To our knowledge, this is the first time such nanofibrous membranes composed of PU and PVA-Gel have been produced. The first time was to load the nanofibrous membranes with both CEO and nCeO2. The obtained results indicate that the proposed PU/PVA-Gel NFs represent promising platforms with CEO and nCeO2 for effectively managing diabetic wounds. Full article
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