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Size-Dependent Effects in Materials for Environmental Protection and Energy Application (3rd Edition)

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

Deadline for manuscript submissions: 20 March 2026 | Viewed by 396

Special Issue Editors


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Guest Editor
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Interests: solid state chemistry; materials for energy storage; lithium ion batteries; sodium ion batteries; electron paramagnetic resonance spectroscopy; structure characterization; intercalation chemistry
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Guest Editor
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria
Interests: oxide glasses; structural characterization; thermal stability; optical properties; sol–gel synthesis; hybrid materials; photocatalytic properties; antibacterial properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Size-dependent effects in nanostructured materials (nanocrystalline, nanophase, or nanocomposite) are highly significant for both fundamental considerations and contemporary technology. When discussing nanostructured materials, the impact of nanoparticle/nanocrystallite size on surface energy, melting temperature, phase transitions, and phase equilibriums must be taken into consideration. Additional elements, including the non-uniform distribution of grain sizes, residual stresses and pores, interface structure, and grain boundary segregations, also impact the exploration of unresolved problems.

Understanding the size-dependent properties of materials continues to be one of the most challenging issues in advanced materials science. This is largely a result of the technological requirements involved in the development of materials with controlled properties, as well as of the recent progress in materials science, nanotechnology and computational chemistry.

The aim of the present Special Issue is to extend the discussion of the dimensional effects in materials for environmental protection and clean energy production as an innovative approach for the development of innovative materials with improved properties. The issue will comprise (but is not limited to) three main classes of advanced inorganic materials which form the basis of modern technologies:

-Materials and thin films for environmental protection;

-Materials for clean energy storage;

-Ceramics/bioceramics and glasses for better living (with applications in optics, molecular electronics and medicine).

Prof. Dr. Radostina Stoyanova
Dr. Albena Bachvarova-Nedelcheva
Guest Editors

Manuscript Submission Information

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Keywords

  • advanced inorganic materials
  • chemistry of materials
  • computational chemistry
  • catalysts/sorbents
  • electrode materials for rechargeable batteries
  • hydrogen storage materials
  • glasses and ceramics
  • optics
  • molecular electronics
  • bio-compatible materials

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Research

20 pages, 3922 KB  
Article
Both Benzannulation and Heteroatom-Controlled Photophysical Properties in Donor–π–Acceptor Ionic Dyes: A Combined Experimental and Theoretical Study
by Przemysław Krawczyk and Beata Jędrzejewska
Materials 2025, 18(20), 4676; https://doi.org/10.3390/ma18204676 - 12 Oct 2025
Viewed by 297
Abstract
Donor–π–acceptor (D–π–A) dyes have garnered significant attention due to their unique optical properties and potential applications in various fields, including optoelectronics, chemical sensing and bioimaging. This study presents the design, synthesis, and comprehensive photophysical investigation of a series of ionic dyes incorporating five- [...] Read more.
Donor–π–acceptor (D–π–A) dyes have garnered significant attention due to their unique optical properties and potential applications in various fields, including optoelectronics, chemical sensing and bioimaging. This study presents the design, synthesis, and comprehensive photophysical investigation of a series of ionic dyes incorporating five- and six-membered heterocyclic rings as electron-donating and electron-withdrawing units, respectively. The influence of the dye structure, i.e., (a) the systematically varied heteroatom (NMe, S and O) in donor moiety, (b) benzannulation of the acceptor part and (c) position of the donor vs. acceptor, on the photophysical properties was evaluated by steady-state and time-resolved spectroscopy across solvents of varying polarity. To probe solvatochromic behavior, the Reichardt parameters and the Catalán four-parameter scale, including polarizability (SP), dipolarity (SdP), acidity (SA) and basicity (SB) parameters, were applied. Emission dynamics were further analyzed through time-resolved fluorescence spectroscopy employing multi-exponential decay models to accurately describe fluorescence lifetimes. Time-dependent density functional theory (TDDFT) calculations supported the experimental findings by elucidating electronic structures, charge-transfer character, and dipole moments in the ground and excited states. The experimental results show the introduction of O or S instead of NMe causes substantial hypsochromic shifts in the absorption and emission bands. Benzannulation enhances the photoinduced charge transfer and causes red-shifted absorption spectra to be obtained without deteriorating the emission properties. Hence, by introducing an appropriate modification, it is possible to design materials with tunable photophysical properties for practical applications, e.g., in opto-electronics or sensing. Full article
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