Emerging Nanostructured Powders: Synthesis and Applications

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: 20 September 2026 | Viewed by 872

Special Issue Editors


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Guest Editor
Faculty of Mechanics and Technology, National University of Science and Technology POLITEHNICA Bucharest—Pitești University Centre, Targu din Vale, Pitesti, Romania
Interests: oxide nanoparticles elaboration and characterization; influence of nanometric scale on properties; applications of nanostructured particles
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Regional Center of Research & Development for Materials, Processes and Innovative Products Dedicated to the Automotive Industry (CRC&D-AUTO), Pitesti University Centre, National University of Science and Technology POLITEHNICA Bucharest, 110040 Pitesti, Romania
Interests: nanomaterials; metal oxide

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Guest Editor
Faculty of Electronics, Communications and Computers, National University of Science and Technology POLITEHNICA Bucharest—Pitești University Centre, 110040 Pitesti, Romania
Interests: materials for electronics; materials for power electronic devices; materials for renewable energy sources
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanostructured powders represent a cornerstone of modern materials science, where the transition from bulk to nanoscale dimensions unlocks a suite of novel and enhanced properties. These materials, characterized by features such as high surface area, quantum confinement effects, and tunable surface chemistry, are revolutionizing fields from energy storage to advanced manufacturing. The ability to engineer these powders with precise control over their size, morphology, crystallinity, surface chemistry, and composition—from complex oxides and high-entropy alloys to MXenes and core–shell structures—is pushing the boundaries of modern materials. This Special Issue is dedicated to exploring the latest breakthroughs in the synthesis, characterization, and multifaceted applications of nanostructured powders.

We cordially invite the submission of high-quality original research articles and comprehensive reviews. Topics of interest include, but are not limited to, the following:

  • Advanced Synthesis Strategies: Novel bottom-up and top-down approaches, including sol–gel, spray pyrolysis, hydrothermal/solvothermal methods, chemical vapor condensation, and mechanochemical synthesis.
  • Emerging Material Systems: Research on MXenes, high-entropy alloys (HEAs), metal–organic frameworks (MOFs), covalent organic frameworks (COFs), and complex multi-component or composite powders.
  • Precision Engineering of Nanostructures: Design and fabrication of hollow, porous, core–shell, and other hierarchically structured powders.
  • Characterization and Properties: Advanced microscopy, spectroscopy, and in situ studies linking nanostructure to functional properties (catalytic, electronic, magnetic, mechanical, etc.).
  • Broad Spectrum of Applications: Focused contributions on energy storage and conversion (batteries, supercapacitors, and fuel cells), catalysis (electro-, photo-, and thermal catalysis), environmental remediation, antimicrobial protection, additive manufacturing (3D printing), biomedicine, and aerospace.

Dr. Adriana-Gabriela Schiopu
Dr. Ecaterina Magdalena Modan
Dr. Mihai Oproescu
Guest Editors

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Keywords

  • nanostructured powders
  • nanospheres
  • oxide metal
  • high-entropy alloys
  • MXenes
  • metal–organic frameworks (MOFs)
  • advanced ceramics
  • energy storage
  • heterogeneous catalysis
  • additive manufacturing
  • functional nanomaterials

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Published Papers (1 paper)

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Research

22 pages, 12196 KB  
Article
Silver-Based Nanoparticles as Antibacterial Materials
by Adriana-Gabriela Schiopu, Mihai Oproescu, Sorin Georgian Moga, Ecaterina Magdalena Modan, Denis Aurelian Negrea, Daniela Istrate, Georgian Vasile Bîrsan and Marian Catalin Ducu
Crystals 2026, 16(2), 124; https://doi.org/10.3390/cryst16020124 - 8 Feb 2026
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Abstract
This study investigates the elaboration, structural characteristics, and antibacterial performance of silver-based nanoparticles obtained via a hydrolytic chemical route, with and without assistance from ultrasound and microwave irradiation. Two silver nitrate precursor concentrations (1 M and 2 M) were employed to evaluate the [...] Read more.
This study investigates the elaboration, structural characteristics, and antibacterial performance of silver-based nanoparticles obtained via a hydrolytic chemical route, with and without assistance from ultrasound and microwave irradiation. Two silver nitrate precursor concentrations (1 M and 2 M) were employed to evaluate the influence of synthesis conditions on phase composition, morphology, and antimicrobial efficiency. The obtained powders were characterized by ATR-FTIR, X-ray diffraction (XRD), and scanning electron microscopy (SEM). XRD analysis revealed that drying at 120 °C led to oxide-rich systems dominated by Ag2O, with minor contributions from metallic Ag and carbonate species, while calcination at 550 °C resulted in complete phase transformation into highly crystalline metallic silver. SEM observations demonstrated that precursor concentration and synthesis assistance strongly affect particle size, aggregation degree, and surface morphology. Ultrasound- and microwave-assisted synthesis promoted finer crystallite sizes and more homogeneous particle distributions compared to non-assisted routes. The antibacterial activity was evaluated against Escherichia coli (Gram-negative) and Clostridium perfringens (Gram-positive, anaerobic, spore-forming). Oxide-rich samples, particularly Ox.Ag/2 M, exhibited rapid and complete bacterial inactivation within 30 min, while metallic silver samples showed time-dependent antibacterial behavior, achieving full inhibition after 4 h. The results demonstrate that antibacterial efficiency is governed by a synergistic interplay between silver oxidation state, nanoscale morphology, and surface reactivity. These findings highlight the potential of tailored silver-based nanomaterials as effective antibacterial materials for biomedical, food safety, and environmental applications. Full article
(This article belongs to the Special Issue Emerging Nanostructured Powders: Synthesis and Applications)
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