Special Issue "Functionalized Magnetic Nanomaterials"

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

Deadline for manuscript submissions: 15 September 2022.

Special Issue Editors

Dr. Rodica Paula Turcu
E-Mail Website
Guest Editor
National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj Napoca, Romania
Interests: nanostructured composites; functionalized magnetic nanoparticles; magnetic micro/nanogels; self-assembled nanoparticles systems; smart composites based on magnetic nanoparticles and stimuli responsive polymers; surface physics and chemistry of nanoparticles; nanomaterials characterization by X-ray Photoelectron Spectroscopy
Prof. Dr. Ladislau Vekas
E-Mail Website
Guest Editor
Center for Fundamental and Advanced Technical Research, Timisoara, Romania
Interests: magnetic nanoparticles; magnetic fluids; ferrofluids; bioferrofluids; magnetic nanocomposites; magnetorheological fluids; magnetic properties; flow properties; structure analysis by scattering techniques; engineering and biomedical applications of magnetizable nanomaterials

Special Issue Information

Dear Colleagues,

Magnetic nanomaterials engineered with a large variety of functional coatings have gained much interest because of their possible applications with dual-mode manipulation controlled by a magnetic field and through the appropriate design of surface properties.

Among the magnetic nanomaterials, magnetic iron oxide nanoparticles and their nanocomposites are very promising for innovative applications in nanomedicine and biotechnology, such as nanotherapeutics, multimodal imaging, targeted drug delivery, hyperthermia, analyte monitoring, and enzyme, protein, and nucleic acid separations, due to their large surface area, excellent magnetic properties, and low toxicity. The nature of magnetic nanoparticles’ surface coating is essential for their behavior in biorelevant media. Well separated or in clusters, with proper surface functionalization, usually dispersed in liquid carriers (bioferrofluids) or embedded/encapsulated in polymeric networks, magnetic nanoparticles are the basic building blocks of a large variety of multifunctional vehicles.

The surface modification of magnetic nanomaterials, including the attachment of functional groups necessary for applications based on interactions ranging from nonspecific (e.g., ionic, hydrophobic/hydrophilic, and hydrogen bond) through group-specific to specific-affinity interactions, is an important issue for the future progress of medical and industrial applications.

The design and preparation of functionalized magnetic nanomaterials could have a strong applicative impact in many fields, such as diagnosis and treatment, regenerative medicine, tissue engineering, magnetic bioseparation, protein immobilization, biocatalysis, biosensors, or water purification, to mention only a few.

In this context, the aim of this Special Issue is to publish original research papers and comprehensive reviews dealing with the most important issues concerning the synthesis, advance properties investigations, and potential applications of functionalized magnetic nanomaterials.

Dr. Rodica Paula Turcu
Prof. Dr. Ladislau Vekas
Guest Editors

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 papers will be 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 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

  • magnetic nanomaterials
  • surface functionalization
  • functionalized magnetic nanoparticles
  • physical–chemical characterization
  • applications

Published Papers (5 papers)

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Research

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Article
Ferrimagnetic Large Single Domain Iron Oxide Nanoparticles for Hyperthermia Applications
Nanomaterials 2022, 12(3), 343; https://doi.org/10.3390/nano12030343 - 21 Jan 2022
Viewed by 177
Abstract
This paper describes the preparation and obtained magnetic properties of large single domain iron oxide nanoparticles. Such ferrimagnetic particles are particularly interesting for diagnostic and therapeutic applications in medicine or (bio)technology. The particles were prepared by a modified oxidation method of non-magnetic precursors [...] Read more.
This paper describes the preparation and obtained magnetic properties of large single domain iron oxide nanoparticles. Such ferrimagnetic particles are particularly interesting for diagnostic and therapeutic applications in medicine or (bio)technology. The particles were prepared by a modified oxidation method of non-magnetic precursors following the green rust synthesis and characterized regarding their structural and magnetic properties. For increasing preparation temperatures (5 to 85 °C), an increasing particle size in the range of 30 to 60 nm is observed. Magnetic measurements confirm a single domain ferrimagnetic behavior with a mean saturation magnetization of ca. 90 Am2/kg and a size-dependent coercivity in the range of 6 to 15 kA/m. The samples show a specific absorption rate (SAR) of up to 600 W/g, which is promising for magnetic hyperthermia application. For particle preparation temperatures above 45 °C, a non-magnetic impurity phase occurs besides the magnetic iron oxides that results in a reduced net saturation magnetization. Full article
(This article belongs to the Special Issue Functionalized Magnetic Nanomaterials)
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Article
Influence of Thickness on the Magnetic and Magnetotransport Properties of Epitaxial La0.7Sr0.3MnO3 Films Deposited on STO (0 0 1)
Nanomaterials 2021, 11(12), 3389; https://doi.org/10.3390/nano11123389 - 14 Dec 2021
Viewed by 517
Abstract
Epitaxial La0.7Sr0.3MnO3 films with different thicknesses (9–90 nm) were deposited on SrTiO3 (0 0 1) substrates by pulsed laser deposition. The films have been investigated with respect to morpho-structural, magnetic, and magneto-transport properties, which have been proven [...] Read more.
Epitaxial La0.7Sr0.3MnO3 films with different thicknesses (9–90 nm) were deposited on SrTiO3 (0 0 1) substrates by pulsed laser deposition. The films have been investigated with respect to morpho-structural, magnetic, and magneto-transport properties, which have been proven to be thickness dependent. Magnetic contributions with different switching mechanisms were evidenced, depending on the perovskite film thickness. The Curie temperature increases with the film thickness. In addition, colossal magnetoresistance effects of up to 29% above room temperature were evidenced and discussed in respect to the magnetic behavior and film thickness. Full article
(This article belongs to the Special Issue Functionalized Magnetic Nanomaterials)
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Article
Aminopropylimidazole as an Advantageous Coating in the Synthesis of Functionalized Magnetite Nanoparticles
Nanomaterials 2021, 11(12), 3276; https://doi.org/10.3390/nano11123276 - 02 Dec 2021
Viewed by 395
Abstract
Implementing new methods to prepare magnetite nanoparticles with a covered or uncovered surface has been, and still is, a significant challenge. In this work, we describe a very clear and effortless way for the preparation of magnetite nanoparticles using two types of bases, [...] Read more.
Implementing new methods to prepare magnetite nanoparticles with a covered or uncovered surface has been, and still is, a significant challenge. In this work, we describe a very clear and effortless way for the preparation of magnetite nanoparticles using two types of bases, namely: 1-(3-aminopropyl)imidazole and sodium hydroxide. Fourier transform infrared spectroscopy (FTIR) served as a tool for the structural investigation of the as-prepared magnetite nanoparticles. The morphology of the samples was investigated using Transmission Electron Microscopy (TEM). Comprehensive high-resolution X-ray photoelectron spectroscopy investigations (XPS) were applied as an effective tool for analyzing the composition of the various types of magnetic nanoparticles. Further polymer linkage was accomplished with poly(benzofuran-co-arylacetic acid) on the amino-functionalized surface of aminopropylimidazole-containing magnetic nanoparticles. The findings are promising for biomedicine, catalysis, and nanotechnology applications. Full article
(This article belongs to the Special Issue Functionalized Magnetic Nanomaterials)
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Article
Effective Removal of Crystal Violet Dye Using Neoteric Magnetic Nanostructures Based on Functionalized Poly(Benzofuran-co-Arylacetic Acid): Investigation of the Adsorption Behaviour and Reusability
Nanomaterials 2021, 11(3), 679; https://doi.org/10.3390/nano11030679 - 09 Mar 2021
Cited by 5 | Viewed by 807
Abstract
Synthetic dyes represent a significant class of contaminants released in the environment. Crystal violet is a triarylmethane dye used in several fields such as printing inks, the textile or paper industries, as well as in cell histology. Coating magnetic nanoparticles with functionalized polymers [...] Read more.
Synthetic dyes represent a significant class of contaminants released in the environment. Crystal violet is a triarylmethane dye used in several fields such as printing inks, the textile or paper industries, as well as in cell histology. Coating magnetic nanoparticles with functionalized polymers has been proved to improve their efficiency, offering unique properties for applications in wastewater treatment. The current paper focuses on preparing and characterising magnetic core-shell nanoparticles coated with poly(benzofuran-co-arylacetic acid) functionalized with folic acid as an organic shell. The new polymer-based magnetic nanostructures were applied for crystal violet extraction from aqueous solutions. The nanostructures were structurally and morphologically investigated by Fourier-transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). While thermal and magnetic properties of the magnetic nanostructures were determined by thermogravimetric analysis (TGA) and magnetization measurements (VSM). At the same time, crystal violet concentrations were determined by UV-VIS spectroscopy. The influence of initial dye concentration and contact time on the removal efficiency has been studied to achieve the optimum adsorption conditions. The dye adsorbent neoteric magnetic nanostructure was easily desorbed and reused, the adsorption capacity decreasing from 100% to 97.63% in the first five cycles, reaching a minimum of 88.74% after the 10th recycling step. Full article
(This article belongs to the Special Issue Functionalized Magnetic Nanomaterials)
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Review

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Review
Functionalized Magnetic Nanomaterials in Agricultural Applications
Nanomaterials 2021, 11(11), 3106; https://doi.org/10.3390/nano11113106 - 18 Nov 2021
Viewed by 496
Abstract
The development of functional nanomaterials exhibiting cost-effectiveness, biocompatibility and biodegradability in the form of nanoadditives, nanofertilizers, nanosensors, nanopesticides and herbicides, etc., has attracted considerable attention in the field of agriculture. Such nanomaterials have demonstrated the ability to increase crop production, enable the efficient [...] Read more.
The development of functional nanomaterials exhibiting cost-effectiveness, biocompatibility and biodegradability in the form of nanoadditives, nanofertilizers, nanosensors, nanopesticides and herbicides, etc., has attracted considerable attention in the field of agriculture. Such nanomaterials have demonstrated the ability to increase crop production, enable the efficient and targeted delivery of agrochemicals and nutrients, enhance plant resistance to various stress factors and act as nanosensors for the detection of various pollutants, plant diseases and insufficient plant nutrition. Among others, functional magnetic nanomaterials based on iron, iron oxide, cobalt, cobalt and nickel ferrite nanoparticles, etc., are currently being investigated in agricultural applications due to their unique and tunable magnetic properties, the existing versatility with regard to their (bio)functionalization, and in some cases, their inherent ability to increase crop yield. This review article provides an up-to-date appraisal of functionalized magnetic nanomaterials being explored in the agricultural sector. Full article
(This article belongs to the Special Issue Functionalized Magnetic Nanomaterials)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Optimal excitation parameters under human safety limits for maximizing nanoparticles heating capabilities
Authors: Fernando Plazaola
Affiliation: Department of Electricity & Electronics Faculty of Science & Technology University of the Basque Country UPV/EHU Sarriena s/n 48940 Leioa Bilbao, Basque Country (Spain)
Abstract: The Specific Absorption Rate (SAR), which measures the absorbed energy per unit of magnetic nanoparticle (MNP) mass, is a crucial parameter to design optimal MNPs for magnetic hyperthermia treatment. In order to achieve an efficient magnetic hyperthermia therapy, MNPs should display the best heating properties and generate as much heat as possible at the lowest particle content. During the magnetic hyperthermia treatment, eddy currents generated by the applied magnetic field, produce a non-specific heating in the body that can affect negatively the heathy tissue of human patients. The strength of the eddy currents depends on the product of the magnetic field intensity and frequency, H× f. The maximum acceptable H×f product, called the safety limit, restricts the external magnetic field excitation that can be employed in magnetic hyperthermia. For this reason, the optimal magnetic field excitation parameters to maximize the SAR within human tolerable limit need to be calculated. To determine the optimal magnetic field intensity and frequency, a high field AC magnetometer or calorimeter that works in a wide frequency range is necessary. So far, the experimental limitation of the current devices restrains the study of the optimal excitation parameters and consequently this issue is overlooked. In this work, the optimal magnetic field intensity and frequency for maximizing the SAR within the safety limit have been calculated for MNPs samples of different size, shape and composition. It is vital to choose the optimal samples for each magnetic hyperthermia treatment in which the excitation frequency or the intensity field are limited. Measurements have been carried out in a wide frequency range (100 kHz-1 MHz) and for fields up to 90 mT at low frequency side and up to 35 mT at high frequency side.

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