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Applied Sciences
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Metal Oxide Nanostructures: Synthesis, Characterization and Applications
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Metal Oxide Nanostructures: Synthesis, Characterization and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Surface Sciences and Technology".

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 2138

Special Issue Editor

Prof. Dr. Ahmed A. El-Gendy

E-Mail Website1 Website2
Guest Editor
Department of Physics, University of Texas at El Paso, El Paso, TX 79968, USA
Interests: soft and hard magnetic nanostructures; permanent magnets; magnetocaloric for magnetic refrigeration; exchange bias; molecular magnets for quantum computing; water treatment; magnetic hyperthermia for cancer therapy; contrast agents for MRI; drug delivery
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue will cover various topics on metal oxide nanoparticles, including their synthesis, characterization and potential for environmental, energy, and medical applications, such as energy harvesting, permanent magnets, magnetocaloric for magnetic refrigeration technology, exchange bias for data storage, molecular magnets for quantum computers, water treatment, hyperthermia cancer therapy, drug delivery, and contrast agents for MRI. Metal oxide nanoparticles have been of interest for many decades due to their chemical and physical properties, including optical, magnetic, electrical, thermal transport, etc. The aim of this Special Issue to cover the state of the art of current innovative research on metal oxide nanoparticles, including experimental and theoretical studies. Therefore, recent results in different methods of synthesizing magnetic nanoparticles, their characterization, and their potential applications are welcome to be submitted.

Prof. Dr. Ahmed A. El-Gendy
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. Applied Sciences 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 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

  • metal oxide nanostructures
  • soft and hard magnetic nanostructures
  • permanent magnets
  • magnetocaloric for magnetic refrigeration
  • exchange bias
  • molecular magnets for quantum computing
  • water treatment
  • magnetic hyperthermia for cancer therapy
  • contrast agents for MRI
  • drug delivery

Published Papers (1 paper)

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Research

12 pages, 2479 KiB  
Article
TiO2–Fe3O4 Composite Systems—Preparation, Physicochemical Characterization, and an Attempt to Explain the Limitations That Arise in Catalytic Applications
by Rafal Krakowiak, Robert Frankowski, Kinga Mylkie, Dariusz T. Mlynarczyk, Marta Ziegler-Borowska, Agnieszka Zgoła-Grześkowiak and Tomasz Goslinski
Appl. Sci. 2022, 12(17), 8826; https://0-doi-org.brum.beds.ac.uk/10.3390/app12178826 - 02 Sep 2022
Cited by 5 | Viewed by 1683
Abstract
In this work, a composite material based on titanium(IV) oxide and iron(II,III) oxide was prepared using mechanothermal method. The obtained composite system was thoroughly characterized using techniques such as scanning electron microscopy, X-ray powder diffraction, thermogravimetric analysis, and nanoparticle tracking analysis. The acute [...] Read more.
In this work, a composite material based on titanium(IV) oxide and iron(II,III) oxide was prepared using mechanothermal method. The obtained composite system was thoroughly characterized using techniques such as scanning electron microscopy, X-ray powder diffraction, thermogravimetric analysis, and nanoparticle tracking analysis. The acute toxicity of the composite material was evaluated with Microtox. In addition, the material’s photocatalytic potential was studied in photodegradation tests of ibuprofen. The composite system revealed magnetic properties of potential usage in its recovery after photocatalytic tests. However, the photocatalytic activity of TiO2–Fe3O4 was lower than that of bare TiO2. In the photocatalytic tests performed under UV (365 nm) light, a 44% reduction of initial ibuprofen concentration in the sample was noted for bare TiO2, while for TiO2–Fe3O4 composite, only a 19% reduction was observed. In visible light (525 nm), both materials achieved statistically insignificant photodegradation rates, which was contrary to the anticipated effect for TiO2–Fe3O4. The observation was explained by a side oxidation reaction of Fe3O4 to Fe2O3 by the generated reactive oxygen species (ROS) in the photocatalytic process, which significantly diminished the amount of available ROS for ibuprofen degradation. The oxidation process appearing within TiO2–Fe3O4 was evident and easily observed as the color of the material turned from gray to brown. Acute toxicity assay performed with the use of Microtox revealed reduced toxicity of TiO2–Fe3O4 (32% inhibition of the Aliivibrio fischeri bacteria cell viability according to bioluminescence emitted) when compared to bare Fe3O4 (56% inhibition), whereas bare TiO2 was non-toxic. In the study, the processes occurring during the photocatalytic reaction were analyzed and discussed in the context of the available literature data. Full article
(This article belongs to the Special Issue Metal Oxide Nanostructures: Synthesis, Characterization and Applications)
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