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Nanomaterials
Special Issues
Synthesis, Properties and Applications of High-Entropy Nanomaterials
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Synthesis, Properties and Applications of High-Entropy Nanomaterials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 July 2023) | Viewed by 1838

Special Issue Editor

Dr. Maria Grazia Musolino

E-Mail Website
Guest Editor
Department of Civil, Energy, Environmental and Materials Engineering, Università degli Studi Mediterranea di Reggio Calabria, Reggio Calabria, Italy
Interests: nanocomposites; nanoparticles; graphene oxide; graphene-based materials; synthesis; structural characterization; green chemistry; heterogeneous catalysis; selective hydrogenation; environmental catalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The development of advanced materials with tailorable properties is essential for fulfilling the demand of constantly evolving modern technologies. High-entropy materials (HEMs), a new class of material obtained by using a configurational entropy-based design approach, have undergone an explosion of interest thanks to the possibility of suitably tuning their structural and functional properties. HEMs are single-phase structures of solid solution stabilized in a multi-component system (generally, five or more elements in equimolar or near-equimolar ratio) through a high configurational entropy. The synergistic effects among the constituent species lead to these systems exhibiting an enhanced performance compared to conventional compounds. Among HEMs, high-entropy oxides (HEOs) are very appealing nanomaterials due to the possibility of obtaining amazing properties by exploiting a great number of possible elemental combinations, thus making them potentially suitable for a wide range of applications, including energy storage, large-k dielectric materials, water splitting, catalysis, and thermal protection and insulation.

This Special Issue will attempt to cover the current state-of-the-art in the field of HEMs, with a particular focus on HEOs, concerning not only their synthesis and characterization but also their functional properties and practical applications.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but is not limited to) the following topics:

  • Design and synthesis of HEMs with outstanding properties;
  • High-entropy oxides nanomaterials;
  • Development of different classes of multicomponent materials;
  • Advanced characterization of HEMs;
  • Fundamental understanding of the synergy of HEMs ;
  • Applications of HEMs including energy storage and conversion, catalysis, water splitting, and thermal protection and insulation.

We look forward to receiving your contributions.

Prof. Dr. Maria Grazia Musolino
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. Nanomaterials 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 2900 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
  • high-entropy
  • synthesis
  • characterization
  • single-phase structure
  • functional properties
  • application

Published Papers (2 papers)

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Research

12 pages, 21229 KiB  
Article
Deformation Induced Structure and Property Changes in a Nanostructured Multiphase CrMnFeCoNi High-Entropy Alloy
by Benjamin Schuh, Inas Issa, Timo Müller, Thomas Kremmer, Christoph Gammer, Reinhard Pippan and Anton Hohenwarter
Nanomaterials 2023, 13(5), 924; https://0-doi-org.brum.beds.ac.uk/10.3390/nano13050924 - 2 Mar 2023
Cited by 2 | Viewed by 1107
Abstract
A nanocrystalline CrMnFeCoNi high-entropy alloy produced using severe plastic deformation using high-pressure torsion was annealed at selected temperatures and times (450 °C for 1 h and 15 h and at 600 °C for 1 h), causing a phase decomposition into a multi-phase structure. [...] Read more.
A nanocrystalline CrMnFeCoNi high-entropy alloy produced using severe plastic deformation using high-pressure torsion was annealed at selected temperatures and times (450 °C for 1 h and 15 h and at 600 °C for 1 h), causing a phase decomposition into a multi-phase structure. The samples were subsequently deformed again by high-pressure torsion to investigate the possibility of tailoring a favorable composite architecture by re-distributing, fragmenting, or partially dissolving the additional intermetallic phases. While the second phase in the 450 °C annealing states had high stability against mechanical mixing, a partial dissolution could be achieved in the samples subjected to 600 °C for 1 h. Full article
(This article belongs to the Special Issue Synthesis, Properties and Applications of High-Entropy Nanomaterials)
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22 pages, 6114 KiB  
Article
Influence of Degree of Severe Plastic Deformation on Thermal Stability of an HfNbTiZr Multi-Principal Element Alloy Processed by High-Pressure Torsion
by Pham Tran Hung, Megumi Kawasaki, Ábel Szabó, János L. Lábár, Zoltán Hegedűs and Jenő Gubicza
Nanomaterials 2022, 12(19), 3371; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12193371 - 27 Sep 2022
Cited by 2 | Viewed by 1107
Abstract
Severe plastic deformation (SPD) is an effective route for the nanocrystallization of multi-principal element alloys (MPEAs). The stability of the refined microstructure is important, considering the high temperature applications of these materials. In the present study, the effect of SPD on the stability [...] Read more.
Severe plastic deformation (SPD) is an effective route for the nanocrystallization of multi-principal element alloys (MPEAs). The stability of the refined microstructure is important, considering the high temperature applications of these materials. In the present study, the effect of SPD on the stability of a body-centered cubic (bcc) HfNbTiZr MPEA was investigated. SPD was performed using a high-pressure torsion (HPT) technique by varying the number of turns between ½ and 10. The evolution of phase composition and microstructure was studied near the disk centers and edges where the imposed strain values were the lowest and highest, respectively. Thus, the shear strain caused by HPT varies between 3 (½ turn, near the center) and 340 (10 turns, near the edge). It was found that during annealing up to 1000 K, the bcc HfNbTiZr alloy decomposed into two bcc phases with different lattice constants at 740 K. In addition, at high strains a hexagonal close packed (hcp) phase was formed above 890 K. An inhomogeneous elemental distribution was developed at temperatures higher than 890 K due to the phase decomposition. The scale of the chemical heterogeneities decreased from about 10 µm to 30 nm where the shear strain increased from 3 to 340, which is similar to the magnitude of grain refinement. Anneal-induced hardening was observed in the MPEA after HPT for both low and high strains at 740 K, i.e., the hardness of the HPT-processed samples increased due to heat treatment. At low strain, the hardness remained practically unchanged between 740 and 1000 K, while for the alloy receiving high strains there was a softening in this temperature range. Full article
(This article belongs to the Special Issue Synthesis, Properties and Applications of High-Entropy Nanomaterials)
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