Special Issue "Metallic and Metal Oxide Nanoparticles: Novel Approaches"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 November 2016)

Special Issue Editor

Guest Editor
Dr. Alexandru Mihai Grumezescu

Department of Science and Engineereing of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, RO-011061, Bucharest, Romania
Website | E-Mail
Interests: synthesis and characterization of nanobiomaterials, pharmaceutical nanotechnology, drug targeting; drug delivery; anti-biofilm surfaces; nanomodified surfaces; thin films; natural products

Special Issue Information

Dear Colleagues,

In the last few decades, nanosized structures, usually ranging from 1–100 nm, were organized in four main categories: 0D, 1D, 2D, and 3D. These structures attracted the attention of scientific communities, which developed applications and implemented them in research areas, such as food sector, medical sector, environmental, and also socio-economical sector. The main purpose of this Special Issue is to highlight the current progress and the impact of metallic and metal oxide nanoparticles in the above mentioned research areas. This Special Issue aims to present novel approaches related to fabrication, characterization methods, properties, and applications of such nanostructures. Considering the fact that health-related applications are mostly investigated, this Special Issue will highlight the novel approaches related to the utility of metallic nanoparticles and metal oxide nanoparticles in drug delivery, drug targeting, cancer therapy, medical imaging, tissue engineering, cosmetics, dentistry, food preservation, water treatment and purification, nutrient delivery, food packaging, nanosensors, new pesticides, and other environmental applications.

Dr. Alexandru Mihai Grumezescu
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 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

  • gold
  • silver
  • magnetite
  • zinc oxide
  • quantum dots
  • nanobiomaterials
  • thin coatings
  • cancer therapy
  • antimicrobials
  • drug delivery and targeting
  • water purification
  • food packaging
  • nanosensors

Published Papers (4 papers)

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Research

Open AccessArticle Preparation and Properties of Microarc Oxidation Self-Lubricating Composite Coatings on Aluminum Alloy
Metals 2017, 7(4), 127; doi:10.3390/met7040127
Received: 22 January 2017 / Revised: 22 March 2017 / Accepted: 28 March 2017 / Published: 5 April 2017
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Abstract
Microarc oxidation (MAO) coatings were prepared on 2024-T4 aluminum alloy using pulsed bipolar power supply at different cathode current densities. The MAO ceramic coatings contained many crater-like micropores and a small number of microcracks. After the MAO coatings were formed, the coated samples
[...] Read more.
Microarc oxidation (MAO) coatings were prepared on 2024-T4 aluminum alloy using pulsed bipolar power supply at different cathode current densities. The MAO ceramic coatings contained many crater-like micropores and a small number of microcracks. After the MAO coatings were formed, the coated samples were immersed into a water-based Polytetrafluoroethylene (PTFE) dispersion. The micropores and microcracks on the surface of the MAO coatings were filled with PTFE dispersion for preparing MAO self-lubricating composite coatings. The microstructure and properties of MAO coatings and the wear resistance of microarc oxidation self-lubricating composite coatings were analyzed by SEM, laser confocal microscope, X-ray diffractometry (XRD), Vickers hardness test, scratch test and ball-on-disc abrasive tests, respectively. The results revealed that the wear rates of the MAO coatings decreased significantly with an increase in cathode current density. Compared to the MAO coatings, the microarc oxidation self-lubricating composite coatings exhibited a lower friction coefficient and lower wear rates. Full article
(This article belongs to the Special Issue Metallic and Metal Oxide Nanoparticles: Novel Approaches)
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Open AccessArticle Synthesis, Characterization, and Toxicity Evaluation of Dextran-Coated Iron Oxide Nanoparticles
Metals 2017, 7(2), 63; doi:10.3390/met7020063
Received: 19 November 2016 / Revised: 6 February 2017 / Accepted: 15 February 2017 / Published: 21 February 2017
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Abstract
We report the synthesis of dextran-coated iron oxide magnetic nanoparticles (DIO-NPs) with spherical shape and uniform size distribution as well as their accumulation and toxic effects on Jurkat cells up to 72 h. The characterization of dextran-coated maghemite nanoparticles was done by X-ray
[...] Read more.
We report the synthesis of dextran-coated iron oxide magnetic nanoparticles (DIO-NPs) with spherical shape and uniform size distribution as well as their accumulation and toxic effects on Jurkat cells up to 72 h. The characterization of dextran-coated maghemite nanoparticles was done by X-ray diffraction and dynamic light scattering analyses, transmission electron microscopy imaging, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, magnetic hysteresis, and relaxometry measurements. The quantification of DIO-NPs intracellular uptake showed a progressive accumulation of iron as a function of time and dose accompanied by additional lysosome formation and an increasing darkening exhibited by a magnetic resonance imaging (MRI) scanner. The cytotoxicity assays revealed a decrease of cell viability and a loss of membrane integrity in a time- and dose-dependent manner. Exposure to DIO-NPs determined an increase in reactive oxygen species level up to 72 h. In the first two days of exposure, the level of reduced glutathione decreased and the amount of malondyaldehyde increased, but at the end of the experiment, their concentrations returned to control values. These nanoparticles could be used as contrast agents for MRI but several parameters concerning their interaction with the cells should be taken into consideration for a safe utilization. Full article
(This article belongs to the Special Issue Metallic and Metal Oxide Nanoparticles: Novel Approaches)
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Figure 1

Open AccessArticle Dissolution Behavior of Alumina-Based Inclusions in CaF2-Al2O3-CaO-MgO-SiO2 Slag Used for the Electroslag Metallurgy Process
Metals 2016, 6(11), 273; doi:10.3390/met6110273
Received: 23 September 2016 / Revised: 4 November 2016 / Accepted: 7 November 2016 / Published: 9 November 2016
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Abstract
Removal of non-metallic inclusions to CaF2-based slag is one of the most important functions of electroslag remelting. In this work, the dissolution behavior for alumina-based inclusions in CaF2-Al2O3-CaO-MgO-SiO2 slag has been investigated. Results indicate
[...] Read more.
Removal of non-metallic inclusions to CaF2-based slag is one of the most important functions of electroslag remelting. In this work, the dissolution behavior for alumina-based inclusions in CaF2-Al2O3-CaO-MgO-SiO2 slag has been investigated. Results indicate that the diffusion or permeability capacity of slag components into alumina particles is F, Ca2+, Si4+, Mg2+, from strongest to weakest, for CaF2-Al2O3-CaO-MgO-SiO2 slag. Alumina inclusions react with F in liquid slag at first and then react with CaO to form xCaO-yAl2O3 system. Subsequently, MgO substitutes for CaO to form a MgO-Al2O3 system layer surrounding the other product and reactant, and then enters the liquid slag. CaF2 can improve the dissolution capacity of slag to alumina inclusions. A complex region was formed between alumina-based particles and the slag, with different areas dominated by CaF2, CaO-Al2O3, CaO-SiO2 and MgO-Al2O3. The dissolution process of alumina particles in slag is different from the formation of compound inclusions originated from the Al-O deoxidization reaction. Full article
(This article belongs to the Special Issue Metallic and Metal Oxide Nanoparticles: Novel Approaches)
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Open AccessFeature PaperArticle Antimicrobial Nanostructured Bioactive Coating Based on Fe3O4 and Patchouli Oil for Wound Dressing
Metals 2016, 6(5), 103; doi:10.3390/met6050103
Received: 8 March 2016 / Revised: 20 April 2016 / Accepted: 26 April 2016 / Published: 30 April 2016
Cited by 1 | PDF Full-text (17646 KB) | HTML Full-text | XML Full-text
Abstract
The aim of this study was to develop a biocompatible coating for wound dressings, containing iron oxide nanoparticles functionalized with patchouli essential oil in order to obtain improved antimicrobial properties able to prevent biofilm development and consecutive associated infections. The bioactive coating was
[...] Read more.
The aim of this study was to develop a biocompatible coating for wound dressings, containing iron oxide nanoparticles functionalized with patchouli essential oil in order to obtain improved antimicrobial properties able to prevent biofilm development and consecutive associated infections. The bioactive coating was prepared by the co-precipitation of a precursor in an alkaline solution of patchouli oil. The prepared surface was characterized by XRD (X ray diffraction), TEM (transmission electron microscopy), SAED (selected area diffraction), SEM (scanning electron microscopy) and FT-IR (Fourier transform infrared spectroscopy). The bioevaluation of the obtained coating consisted in antimicrobial, as well as in vitro and in vivo biocompatibility and biodistribution assays. The obtained coating revealed a strong anti-biofilm activity maintained up to 72 h, as well as a low cytotoxicity on mammalian cells and a good biodistribution after intraperitoneal injection in mice. These results demonstrate the promising potential of the respective coatings for the management of wound infections and for the development of soft materials with improved resistance to microbial colonization. Full article
(This article belongs to the Special Issue Metallic and Metal Oxide Nanoparticles: Novel Approaches)
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