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Nanocomposite Based Materials for Various Applications

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: closed (20 April 2024) | Viewed by 2741

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Special Issue Editor

Prof. Dr. Sher Bahadar Khan

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Guest Editor

Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
Interests: chemistry; nanomaterials; catalysis; adsorption

Special Issue Information

Dear Colleagues,

Due to the numerous applications, particularly in the areas of catalysis, medicine, food, cosmetics, energy and the environment, nanocomposites have attracted a great deal of interest in recent years. The synthesis, production and use of nanocomposite materials, and the investigation of their novel applications have all recently received substantial attention. Nanocomposites using various components, such as nanoparticles, polymers, and natural goods, have seized another major field with more features and expanded applicability. In-situ and ex-situ addition, polymer blending, solution casting, electrospinning, and other composite synthesis techniques have all been documented, but research into new synthetic pathways and their various applications is still ongoing.

We intend to publish a special issue here with the title "nanocomposite based nanomaterials for various applications". We encourage submissions from a number of highly significant disciplines, including those that discuss novel composite synthetic processes and their uses in sensors, catalysis, medicinal, environmental, and energy fields.

Prof. Dr. Sher Bahadar Khan
Guest Editor

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. Materials is an international peer-reviewed open access semimonthly 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 2600 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

nanomaterials
nanocomposites
polymers
metal oxides
catalyst support
environmental applications
biomedical applications
energy applications
sensor applications
catalysis applications
adsorption applications

Published Papers (5 papers)

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Research

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21 pages, 7675 KiB

Open AccessArticle

Polydopamine-Coated Copper-Doped Co₃O₄ Nanosheets Rich in Oxygen Vacancy on Titanium and Multimodal Synergistic Antibacterial Study

by Jinteng Qi, Miao Yu, Yi Liu, Junting Zhang, Xinyi Li, Zhuo Ma, Tiedong Sun, Shaoqin Liu and Yunfeng Qiu

Materials 2024, 17(9), 2019; https://doi.org/10.3390/ma17092019 - 26 Apr 2024

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Abstract

Medical titanium-based (Ti-based) implants in the human body are prone to infection by pathogenic bacteria, leading to implantation failure. Constructing antibacterial nanocoatings on Ti-based implants is one of the most effective strategies to solve bacterial contamination. However, single antibacterial function was not sufficient to efficiently kill bacteria, and it is necessary to develop multifunctional antibacterial methods. This study modifies medical Ti foils with Cu-doped Co₃O₄ rich in oxygen vacancies, and improves their biocompatibility by polydopamine (PDA/Cu-O_v-Co₃O₄). Under near-infrared (NIR) irradiation, nanocoatings can generate •OH and ¹O₂ due to Cu⁺ Fenton-like activity and a photodynamic effect of Cu-O_v-Co₃O₄, and the total reactive oxygen species (ROS) content inside bacteria significantly increases, causing oxidative stress of bacteria. Further experiments prove that the photothermal process enhances the bacterial membrane permeability, allowing the invasion of ROS and metal ions, as well as the protein leakage. Moreover, PDA/Cu-O_v-Co₃O₄ can downregulate ATP levels and further reduce bacterial metabolic activity after irradiation. This coating exhibits sterilization ability against both Escherichia coli and Staphylococcus aureus with an antibacterial rate of ca. 100%, significantly higher than that of bare medical Ti foils (ca. 0%). Therefore, multifunctional synergistic antibacterial nanocoating will be a promising strategy for preventing bacterial contamination on medical Ti-based implants. Full article

(This article belongs to the Special Issue Nanocomposite Based Materials for Various Applications)

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16 pages, 6462 KiB

Open AccessArticle

Synergistic Effect of Carbon Micro/Nano-Fillers and Surface Patterning on the Superlubric Performance of 3D-Printed Structures

by Katerina Gkougkousi, Alexandros E. Karantzalis, Pantelis G. Nikolakopoulos and Konstantinos G. Dassios

Materials 2024, 17(5), 1215; https://doi.org/10.3390/ma17051215 - 06 Mar 2024

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Abstract

Superlubricity, the tribological regime where the coefficient of friction between two sliding surfaces almost vanishes, is currently being investigated as a viable route towards the energy efficiency envisioned by major long-term strategies for a sustainable future. This current study provides new insights towards the development of self-lubricating systems by material and topological design, systems which tend to exhibit near-superlubric tribological performance, by reporting the synergistic effect of selective surface patterning and presence of carbon micro/nano-fillers on the frictional coefficients of additively manufactured structures. Geometric and biomimetic surface patterns were prepared by fused deposition modelling (FDM), using printing filaments of a polymeric matrix infused with graphene nanoplatelets (GNPs) and carbon fibers (C_f). The calorimetric, spectroscopic, mechanical and optical microscopy characterization of the starting materials and as-printed structures provided fundamental insights for their tribological characterization under a ball-on-disk configuration. In geometrically patterned PLA-based structures, a graphene presence reduced the friction coefficient by ca. 8%, whereas PETG exhibited the lowest coefficients, in the vicinity of 0.1, indicating a high supelubric potential. Biomimetic patterns exhibited an inferior frictional response due to their topologically and tribologically anisotropy of the surfaces. Overall, a graphene presence in the starting materials demonstrated great potential for friction reduction, while PETG showed a tribological performance not only superior to PLA, but also compatible with superlubric performance. Methodological and technical challenges are discussed in the text. Full article

(This article belongs to the Special Issue Nanocomposite Based Materials for Various Applications)

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22 pages, 4276 KiB

Open AccessArticle

Silver Nanoparticles-Chitosan Nanocomposites: A Comparative Study Regarding Different Chemical Syntheses Procedures and Their Antibacterial Effect

by Dan Chicea, Alexandra Nicolae-Maranciuc and Liana-Maria Chicea

Materials 2024, 17(5), 1113; https://doi.org/10.3390/ma17051113 - 28 Feb 2024

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Abstract

Nanocomposites based on silver nanoparticles and chitosan present important advantages for medical applications, showing over time their role in antibacterial evaluation. This work presents the comparative study of two chemical synthesis procedures of nanocomposites, based on trisodium citrate dihydrate and sodium hydroxide, using various chitosan concentrations for a complex investigation. The nanocomposites were characterized by AFM and DLS regarding their dimensions, while FT-IR and UV–VIS spectrometry were used for the optical properties and to reveal the binding of silver nanoparticles with chitosan. Their antibacterial effect was determined using a disk diffusion method on two bacteria strains, E. coli and S. aureus. The results indicate that, when using both methods, the nanocomposites obtained were below 100 nm, yet the antibacterial effect proved to be stronger for the nanocomposites obtained using sodium hydroxide. Furthermore, the antibacterial effect can be related to the nanocomposites’ sizes, since the smallest dimension nanocomposites exhibited the best bacterial growth inhibition on both bacteria strains we tested and for both types of silver nanocomposites. Full article

(This article belongs to the Special Issue Nanocomposite Based Materials for Various Applications)

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13 pages, 7320 KiB

Open AccessFeature PaperArticle

SnAg₂O₃-Coated Adhesive Tape as a Recyclable Catalyst for Efficient Reduction of Methyl Orange

by Kalsoom Akhtar, Asma A. Alhaj, Esraa M. Bakhsh, Sher Bahadar Khan and Taghreed M. Fagieh

Materials 2023, 16(21), 6978; https://doi.org/10.3390/ma16216978 - 31 Oct 2023

Viewed by 733

Abstract

Silver oxide-doped tin oxide (SnAg₂O₃) nanoparticles were synthesized and different spectroscopic techniques were used to structurally identify SnAg₂O₃ nanoparticles. The reduction of 4-nitrophenol (4-NP), congo red (CR), methylene blue (MB), and methyl orange (MO) was studied using SnAg₂O₃ as a catalyst. Only 1.0 min was required to reduce 95% MO; thus, SnAg₂O₃ was found to be effective with a rate constant of 3.0412 min⁻¹. Being a powder, SnAg₂O₃ is difficult to recover and recycle multiple times. For this reason, SnAg₂O₃ was coated on adhesive tape (AT) to make it recyclable for large-scale usage. SnAg₂O₃@AT catalyst was assessed toward MO reduction under various conditions. The amount of SnAg₂O₃@AT, NaBH₄, and MO was optimized for best possible reduction conditions. The catalyst had a positive effect since it speed up the reduction of MO by adding more SnAg₂O₃@AT and NaBH₄ as well as lowering the MO concentration. SnAg₂O₃@AT totally reduced MO (98%) in 3.0 min with a rate constant of 1.3669 min⁻¹. These findings confirmed that SnAg₂O₃@AT is an effective and useful catalyst for MO reduction that can even be utilized on a large scale for industrial purposes. Full article

(This article belongs to the Special Issue Nanocomposite Based Materials for Various Applications)

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Review

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33 pages, 16215 KiB

Open AccessReview

High-Performance Nanoscale Metallic Multilayer Composites: Techniques, Mechanical Properties and Applications

by Mahmoud Ebrahimi, Bangcai Luo, Qudong Wang and Shokouh Attarilar

Materials 2024, 17(9), 2124; https://doi.org/10.3390/ma17092124 - 30 Apr 2024

Viewed by 245

Abstract

Due to their exceptional properties and diverse applications, including to magnetic devices, thermoelectric materials, catalysis, biomedicine, and energy storage, nanoscale metallic multilayer composites (NMMCs) have recently attracted great attention. The alternating layers of two or more metals that make up NMMCs are each just a few nanometers thick. The difficulties in producing and synthesizing new materials can be overcome by using nanoscale multilayer architectures. By adjusting the layer thickness, composition, and interface structure, the mechanical properties of these materials can be controlled. In addition, NMMCs exhibit unusually high strength at thin layer thicknesses because the multilayers have exceptionally high strength, as the individual layer thicknesses are reduced to the nanoscale. The properties of NMMCs depend on the individual layers. This means that the properties can be tuned by varying the layer thickness, composition, and interface structure. Therefore, this review article aims to provide a comprehensive overview of the mechanical properties and the application of high-performance NMMCs. The paper briefly discusses the fabrication methods used to produce these composites and highlights their potential in various fields, such as electronics, energy storage, aerospace, and biomedical engineering. Furthermore, the electrical conductivity, mechanical properties, and thermal stability of the above composite materials are analyzed in detail. The review concludes with a discussion of the future prospects and challenges associated with the development of NMMCs. Full article

(This article belongs to the Special Issue Nanocomposite Based Materials for Various Applications)

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