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Nanoparticles and Nanotechnology: From Synthesis to Application II

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: closed (10 March 2024) | Viewed by 4072

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Dr. Mateusz Dulski

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Silesian Center for Education and Interdisciplinary Research, Faculty of Science and Technology, Institute of Materials Science, University of Silesia, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland
Interests: nanomaterials; composite systems; multifunctional structures; silica-based systems; infrared and Raman spectroscopy
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Dear Colleagues,

One of the routes to developing a multifunctional engineering system seems to be “evolutionary nanotechnology”. The main goal of such an approach is the improvement of the existing processes, materials, and applications by scaling them down into the “nano” realm and ultimately fully exploiting the unique surface phenomena of that matter. Among the nanomaterials (Φ ~100 nm) that have been fabricated for various applications are carbon, carbon nanotube, metallic, and ceramic particles, which are particularly desirable in the environmental, biomedical, and construction sectors. Such components allow us to enhance the physicochemical, biological (comparable to the real components of human bone), and mechanical parameters in relation to bulk ones. As a result, structures prepared in the form of nanocomposites can be widely used in different fields, including electronics, energy storage, sensing, catalysis, and biology. In addition, they may replace and improve the material properties commonly used in daily life. Hence, many research groups around the world are focused on the development and investigation of novel substances or materials with a broad spectrum of applications. Therefore, I would like to invite all researchers interested in the field of nanomaterials to consider publishing a paper in this Special Issue. We hope that your studies will result in the preparation of high-quality original research articles.

Dr. Mateusz Dulski
Guest Editor

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Keywords

porous nanomaterials
hybrid nanostructures
functional materials
nanocomposites
host–guest systems
synthesis
functional units
functionalization methods
physicochemical features (optical, magnetic, etc.)
biological investigations

Published Papers (3 papers)

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14 pages, 5318 KiB

Open AccessArticle

Functionalization of the NiTi Shape Memory Alloy Surface through Innovative Hydroxyapatite/Ag-TiO₂ Hybrid Coatings

by Karolina Dudek, Mateusz Dulski, Jacek Podwórny, Magdalena Kujawa, Anna Gerle and Patrycja Rawicka

Materials 2024, 17(3), 604; https://doi.org/10.3390/ma17030604 - 26 Jan 2024

Cited by 1 | Viewed by 889

Abstract

The objective of this research was to develop a surface modification for the NiTi shape memory alloy, thereby enabling its long-term application in implant medicine. This was achieved through the creation of innovative multifunctional hybrid layers comprising a nanometric molecular system of silver-rutile (Ag-TiO₂), known for its antibacterial properties, in conjunction with bioactive submicro- and nanosized hydroxyapatite (HAp). The multifunctional, continuous, crack-free coatings were produced using the electrophoretic deposition method (EPD) at 20 V/1 min. Structural and morphological analyses through Raman spectrometry and scanning electron microscopy (SEM) provided comprehensive insights into the obtained coating. The silver within the layer existed in the form of nanometric silver carbonates (Ag₂CO₃) and metallic nanosilver. Based on DTA/TG results, dilatometric measurements, and high-temperature microscopy, the heat treatment temperature for the deposited layers was set at 800 °C for 2 h. The procedures applied resulted in the creation of a new generation of materials with a distinct structure compared with the initial nanopowders. The resulting composite layer, measuring 2 μm in thickness, comprised hydroxyapatite (HAp), apatite carbonate (CHAp), metallic silver, silver oxides, Ag@C, and rutile exhibiting a defective structure. This structural characteristic contributes significantly to its heightened activity, influencing both bioactivity and biocompatibility properties. Full article

(This article belongs to the Special Issue Nanoparticles and Nanotechnology: From Synthesis to Application II)

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17 pages, 4704 KiB

Open AccessArticle

Sulphated TiO₂ Reduced by Ammonia and Hydrogen as an Excellent Photocatalyst for Bacteria Inactivation

by Piotr Rychtowski, Oliwia Paszkiewicz, Agata Markowska-Szczupak, Grzegorz Leniec and Beata Tryba

Materials 2024, 17(1), 66; https://doi.org/10.3390/ma17010066 - 22 Dec 2023

Viewed by 567

Abstract

This study presents a relatively low-cost method for modifying TiO₂-based materials for photocatalytic bacterial inactivation. The photocatalytic inactivation of Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus epidermidis) bacteria using modified sulphated TiO₂ was studied. The modification focused on the reduction of TiO₂ by ammonia agents and hydrogen at 400–450 °C. The results showed a high impact of sulphate species on the inactivation of E. coli. The presence of these species generated acid sites on TiO₂, which shifted the pH of the reacted titania slurry solution to lower values, around 4.6. At such a low pH, TiO₂ was positively charged. The ammonia solution caused the removal of sulphate species from TiO₂. On the other hand, hydrogen and ammonia molecules accelerated the removal of sulphur species from TiO₂, as did heating it to 450 °C. Total inactivation of E. coli was obtained within 30 min of simulated solar light irradiation on TiO₂ heat-treated at 400 °C in an atmosphere of Ar or NH₃. The S. epidermidis strain was more resistant to photocatalytic oxidation. The contact of these bacteria with the active titania surface is important, but a higher oxidation force is necessary to destroy their cell membrane walls because of their thicker cell wall than E. coli. Therefore, the ability of a photocatalyst to produce ROS (reactive oxidative species) will determine its ability to inactivate S. epidermidis. An additional advantage of the studies presented is the inactivation of bacteria after a relatively short irradiation time (30 min), which does not often happen with photocatalysts not modified with noble metals. The modification methods presented represent a robust and inexpensive alternative to photocatalytic inactivation of bacteria. Full article

(This article belongs to the Special Issue Nanoparticles and Nanotechnology: From Synthesis to Application II)

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15 pages, 4456 KiB

Open AccessArticle

Ganoderma lucidum-Mediated Green Synthesis of Silver Nanoparticles with Antimicrobial Activity

by Mariana Constantin, Iuliana Răut, Raluca Suica-Bunghez, Cristina Firinca, Nicoleta Radu, Ana-Maria Gurban, Silviu Preda, Elvira Alexandrescu, Mihaela Doni and Luiza Jecu

Materials 2023, 16(12), 4261; https://doi.org/10.3390/ma16124261 - 08 Jun 2023

Cited by 5 | Viewed by 2225

Abstract

“Green chemistry” is a simple and easily reproductible method that provides nanoparticles characterized by better stability and good dispersion in an aqueous solution. Nanoparticles can be synthesized by algae, bacteria, fungi, and plant extracts. Ganoderma lucidum is a commonly used medicinal mushroom with distinctive biological properties, such as antibacterial, antifungal, antioxidant, anti-inflammatory, anticancer, etc. In this study, aqueous mycelial extracts of Ganoderma lucidum were used to reduce AgNO₃ to form silver nanoparticles (AgNPs). The biosynthesized nanoparticles were characterized by UV-visible spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analysis. The maximum UV absorption was obtained at 420 nm, which represents the specific surface plasmon resonance band for biosynthesized silver nanoparticles. SEM images showed particles as predominantly spherical, while FTIR spectroscopic studies illustrated the presence of functional groups that can support the reducing of ion Ag⁺ to Ag(0). XRD peaks ratified the presence of AgNPs. The antimicrobial effectiveness of synthesized nanoparticles was tested against Gram-positive and Gram-negative bacterial and yeasts strains. The silver nanoparticles were effective against pathogens, inhibiting their proliferation, and thus reducing the risk to the environment and to public health. Full article

(This article belongs to the Special Issue Nanoparticles and Nanotechnology: From Synthesis to Application II)

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