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Metals
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Metallic Nanocomposites
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Metallic Nanocomposites

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metallic Functional Materials".

Deadline for manuscript submissions: closed (31 March 2021) | Viewed by 13837

Special Issue Editor

Dr. Peter Baumli

E-Mail Website
Guest Editor
Institute of Physical Metallurgy, Metalforming and Nanotechnology, University of Miskolc, Miskolc, Hungary
Interests: nanomaterials; composites; wettability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to bring to your attention a Special Issue on “Metallic Nanocomposites”, which is in the interest of the scientific and industrial community.

In this Special Issue, we will gather papers relating to the latest advancements in the field of metallic nanocomposites pertaining to various fields. These include structural, functional, and biomechanical applications. The papers may include novel approaches to theoretical understanding, experimental studies, and/or a combination of both. This issue covers all related processing routes, including metal casting, powder technology, and electrochemical and electroless methods. The submitted papers may investigate any specific properties (mechanical, electrical and electronic, chemical behavior, etc.) relating to nanocomposites, as well as the wide range of characterization techniques, such as SEM, EDS, TEM, XRD etc.

Assoc. Prof. Peter Baumli
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. Metals 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 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
  • nanosized reinforcement
  • metallic matrix
  • synthesis, characterization, and applications of nanocomposites

Published Papers (5 papers)

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Research

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17 pages, 4721 KiB  
Article
The Influence of the Ratio of Au and Pt Nanoparticles in Ternary Composites with TiO2
by Boglárka Hampel, Lucian Baia, Klara Hernadi and Zsolt Pap
Metals 2021, 11(4), 628; https://doi.org/10.3390/met11040628 - 13 Apr 2021
Cited by 2 | Viewed by 1873
Abstract
In the present work, ternary composites were synthesized from commercial titanias (Evonik Aeroxide P25, Aldrich anatase—AA and Aldrich rutile—AR) and two noble metals (gold and platinum). This research focuses on the composition of the photocatalysts, especially on the noble metals. The ratio between [...] Read more.
In the present work, ternary composites were synthesized from commercial titanias (Evonik Aeroxide P25, Aldrich anatase—AA and Aldrich rutile—AR) and two noble metals (gold and platinum). This research focuses on the composition of the photocatalysts, especially on the noble metals. The ratio between the noble metals varies from 0.25 to 0.75% in each composite for each noble metal. Transmission electron microscopy (TEM), X-ray diffraction (XRD) and diffuse reflectance spectroscopy (DRS) measurements were carried out to investigate the structural and optical properties. From the TEM, it can be observed that the particle sizes of the noble metals were between 1 and 4 nm, while the (anatase and rutile) crystals of P25 were 20–40 nm. The XRD showed that the semiconductors’ composition remained unchanged during/after the deposition of noble metal nanoparticles. By the DRS measurements, using the Kubelka–Munk equation, it can be concluded that the deposition of the noble metal nanoparticles resulted the decrease of the bandgap energies of the titanias. The photocatalytic activity was investigated under the irradiation of UV light. Oxalic acid and salicylic acid were used as model pollutants. The hydrogen production capacity was investigated as well, where the sacrificial agent was oxalic acid, and UV irradiation was used. Full article
(This article belongs to the Special Issue Metallic Nanocomposites)
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9 pages, 7621 KiB  
Article
Dielectric Studies of Bi2MoO6/Graphene Oxide and La-Doped Bi2MoO6/Graphene Oxide Nanocomposites
by Syed Farooq Adil, Shoomaila Latif, Muhammad Waqar, Muhammad Imran, Sadia Noreen, Mujeeb Khan, Mohammed Rafi Shaik and Mohammad Rafe Hatshan
Metals 2021, 11(4), 559; https://doi.org/10.3390/met11040559 - 29 Mar 2021
Cited by 2 | Viewed by 2238
Abstract
The mixed metal oxides Bi2MoO6 and La-doped Bi2MoO6 were prepared by the sol–gel method. Then, varying quantities of the as-prepared mixed metal oxides were blended with graphene oxide (GO), employing sonication, to obtain Bi2MoO6 [...] Read more.
The mixed metal oxides Bi2MoO6 and La-doped Bi2MoO6 were prepared by the sol–gel method. Then, varying quantities of the as-prepared mixed metal oxides were blended with graphene oxide (GO), employing sonication, to obtain Bi2MoO6/GO (BM/GO) and La-Bi2MoO6/GO (LBM/GO) nanocomposites. These prepared materials were characterized by different techniques such as thermal gravimetric analysis (TGA), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and transmission electron microscopy (TEM). Dielectric properties were studied by using a precision impedance analyzer. Dielectric constant and loss tan of the synthesized composites were studied as a function of frequency by using a precision impedance analyzer. Overall, the dielectric constant (ɛ’) observed for the LBM/GO composites was higher than that of BM/GO. Full article
(This article belongs to the Special Issue Metallic Nanocomposites)
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17 pages, 6072 KiB  
Article
Strengthening of Nanocrystalline Al with Al3Zr Core-Shell Structure
by Dora Janovszky
Metals 2020, 10(9), 1144; https://doi.org/10.3390/met10091144 - 24 Aug 2020
Cited by 2 | Viewed by 2298
Abstract
High-density Al-based composites reinforced with ten-wt.% recycled nanocrystalline CuZrAgAl particles have been fabricated by mechanical milling, cold- and hot-pressing. The microstructures, phase transformations, and mechanical properties of the mixed powder and sintered samples were investigated. After milling in a ball mill for 30 [...] Read more.
High-density Al-based composites reinforced with ten-wt.% recycled nanocrystalline CuZrAgAl particles have been fabricated by mechanical milling, cold- and hot-pressing. The microstructures, phase transformations, and mechanical properties of the mixed powder and sintered samples were investigated. After milling in a ball mill for 30 h, the microhardness of the mixed powder increases to 301 ± 31 HV0.01 and 222 ± 10 HV0.01 without and with ethanol milling, respectively. On account of the interdiffusion, the melting temperature of mixed powder reduces to 574 ± 5.0 °C and 627.5 ± 6.5 °C after 30 h milling. The study showed that the reinforcing particles are homogeneously distributed in the sintered nanocrystalline Al-based composites. During the hot-pressing, a shell zone forms at the interface of reinforcing particles during hot pressing after high energy milling with a minimum of ten hours milling time. This shell zone consists of Al3Zr (D023) phase. The coarsening resistant core-shell structure and grain refinement greatly improve mechanical properties. The compression strength at room temperature varies between 650 and 800 MPa at room temperature and is 380 MPa at 400 °C for the composite containing ten-wt.% of the Cu-Zr-based amorphous-nanocrystalline phases. The Brinell hardness of the sintered composite is 329 HB. Full article
(This article belongs to the Special Issue Metallic Nanocomposites)
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Review

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16 pages, 1513 KiB  
Review
Interfacial Aspects of Metal Matrix Composites Prepared from Liquid Metals and Aqueous Solutions: A Review
by Peter Baumli
Metals 2020, 10(10), 1400; https://doi.org/10.3390/met10101400 - 21 Oct 2020
Cited by 12 | Viewed by 3286
Abstract
The paper reviews the preparation of the different metallic nanocomposites. In the preparation of composites, especially in the case of nanocomposites, interfacial phenomena play an important role. This review summarizes the literature on various interfacial phenomena, such as wettability and reactivity in the [...] Read more.
The paper reviews the preparation of the different metallic nanocomposites. In the preparation of composites, especially in the case of nanocomposites, interfacial phenomena play an important role. This review summarizes the literature on various interfacial phenomena, such as wettability and reactivity in the case of casting techniques and colloidal behavior in the case of electrochemical and electroless methods. The main contribution of this work lies in the evaluation of collected interfacial phenomena and difficulties in the production of metal matrix composites, for both nano-sized and micro-sized reinforcements. This study can guide the composite maker in choosing the best criteria for producing metal matrix composites, which means a real interface with good adhesion between the matrix and the reinforcement. This criterion results in desirable mechanical and physical properties and homogenous dispersion of the reinforcement in the matrix. Full article
(This article belongs to the Special Issue Metallic Nanocomposites)
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Other

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20 pages, 8496 KiB  
Opinion
Catalytic Degradability of p-Nitrophenol Using Ecofriendly Silver Nanoparticles
by Ganesh Shimoga, Ramasubba Reddy Palem, Soo-Hong Lee and Sang-Youn Kim
Metals 2020, 10(12), 1661; https://doi.org/10.3390/met10121661 - 11 Dec 2020
Cited by 20 | Viewed by 3421
Abstract
In an effort to produce non-toxic and economically viable “green” protocols for waste water treatment, researchers are actively involved to develop versatile and effective silver nanoparticles (SNPs) as nano-catalyst from bio-based techniques. Since, p-nitrophenol (PNP) is one of the anthropogenic contaminants, considerable [...] Read more.
In an effort to produce non-toxic and economically viable “green” protocols for waste water treatment, researchers are actively involved to develop versatile and effective silver nanoparticles (SNPs) as nano-catalyst from bio-based techniques. Since, p-nitrophenol (PNP) is one of the anthropogenic contaminants, considerable attention has been focused in catalytic degradability of PNP in wastewater treatment by curtailing serious effect on aquatic fauna. Ingestion of contaminants by aquatic organisms will not only affect the aquatic species but is also a potential threat to human health, especially if the toxic contaminants are involved in food chain. In this short report, we provided a comprehensive insight on few remarkable nanocatalysts especially based on SNPs and its biopolymer composites synthesized via ecofriendly “green” route. The beneficiality and catalytic performance of these silver nanocatalysts are concisely documented on standard model degradation reduction of PNP to p-aminophenol (PAP) in the presence of aqueous sodium borohydride. The catalytic degradation of PNP to PAP using SNPs follows pseudo first order kinetics involving six-electrons with lower activation energy. Furthermore, we provided a list of highly effective, recoverable, and economically viable SNPs, which demonstrated its potential as nanocatalysts by focusing its technical impact in the area of water remediation. Full article
(This article belongs to the Special Issue Metallic Nanocomposites)
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