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Crystals
Special Issues
Feature Papers on "Hybrid and Composite Crystalline Materials" 2023–2024
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Feature Papers on "Hybrid and Composite Crystalline Materials" 2023–2024

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

Deadline for manuscript submissions: 31 December 2024 | Viewed by 7563

Special Issue Editor

Prof. Dr. Leonid Kustov

E-Mail Website
Guest Editor
1. N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, 119991 Moscow, Russia
2. Chemistry Department, Moscow State University, Leninskie Gory 1, Bldg. 3, 119992 Moscow, Russia
3. Institute of Ecology and Engineering, National Science and Technology University MISiS, Leninsky Prospect 4, 119071 Moscow, Russia
Interests: catalysis; nanomaterials; renewables; green chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleague,

This Special Issue entitled “Feature Papers on ‘Hybrid and Composite Crystalline Materials’ 2023–2024” covers topics related to the chemistry and structure of diverse hybrid and composite crystalline materials, the design and engineering of these materials, and their applications. Hybrid and composite crystalline materials include, inter alia, coordination polymers; metal–organic frameworks; covalent organic frameworks; hierarchical zeolites and zeolite-like materials; organic–inorganic hybrids; composites based on graphene, carbon nitride, or layered sulfides; and composites based on metal, metal oxide, metal chalcogenide, or metal pnictide nanoparticles stabilized with organic ligands or polymers (such nanoparticles can be either unsupported or supported onto appropriate matrices). Other topics related to the design and application of hybrid and composite crystalline materials are welcome. For example, coordination chemistry, the influence of intermolecular interactions on the geometry and arrangement of species constituting hybrid and composite crystalline materials, and cooperative and synergistic effects will all be considered.

For this Special Issue, we aim to publish high-quality articles within the field of hybrid and composite crystalline materials. A discount on the article processing charge will be available for published papers. Please feel free to contact Jocelyn Bai (jocelyn.bai@mdpi.com) if you would like to contribute to this Special Issue.

Prof. Dr. Leonid Kustov
Guest Editor

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 submissions that pass pre-check are 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. Crystals is an international peer-reviewed open access monthly 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 2600 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

  • hybrid materials
  • composite materials
  • intermolecular interactions
  • molecular crystals
  • coordination polymers
  • metal–organic frameworks
  • covalent organic frameworks
  • hierarchical zeolites
  • zeolite-like materials
  • organic–inorganic hybrids
  • graphene
  • carbon nitride
  • layered sulfides
  • metal nanoparticles
  • metal oxide nanoparticles
  • metal chalcogenide nanoparticles
  • metal pnictide nanoparticles

Published Papers (5 papers)

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Research

13 pages, 4519 KiB  
Article
Mechanical, Electrical, and Glass Transition Behavior of Copper–PMMA Composites
by Victor H. Poblete and Mariela P. Alvarez
Crystals 2023, 13(3), 368; https://doi.org/10.3390/cryst13030368 - 21 Feb 2023
Cited by 1 | Viewed by 1218
Abstract
The mechanical, electrical, and glass transition behaviors (Tg) of polymethylmethacrylate (PMMA)–metal systems have been studied. Considering both the particle size and the metal filler concentration, the electrical conductivity showed a clear dependence on the sample thickness to reach percolation. An increase of up [...] Read more.
The mechanical, electrical, and glass transition behaviors (Tg) of polymethylmethacrylate (PMMA)–metal systems have been studied. Considering both the particle size and the metal filler concentration, the electrical conductivity showed a clear dependence on the sample thickness to reach percolation. An increase of up to 400% of strain-to-failure for the 2% v/v of nanometric filler composites in the mechanical test was observed. Tg analysis showed a decrease in the glass transition temperature when the increase of nanometric metallic filler reached the limit of 2% v/v. Over this concentration, the Tg values showed a tendency to reach the original value of the polymeric matrix without conductive filler. For the 20% v/v micrometric filler composites, the strain-to-failure increased up to 58%, but in the Tg analysis of this composite, no relevant changes were observed when the micrometric metallic filler was increased. Full article
(This article belongs to the Special Issue Feature Papers on "Hybrid and Composite Crystalline Materials" 2023–2024)
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13 pages, 4071 KiB  
Article
Ion-Beam Synthesis of Structure-Oriented Iron Nanoparticles in Single-Crystalline Rutile TiO2
by Iskander R. Vakhitov, Nikolay M. Lyadov, Vladimir I. Vdovin, Anton K. Gutakovskii, Vladimir I. Nuzhdin, Lenar R. Tagirov and Rustam I. Khaibullin
Crystals 2023, 13(2), 355; https://doi.org/10.3390/cryst13020355 - 18 Feb 2023
Viewed by 1171
Abstract
Magnetic nanoparticles embedded into semiconductors have current perspectives for use in semiconducting spintronics. In this work, 40 keV Fe+ ions were implanted in high fluences of (0.5 ÷ 1.5) × 1017 ion/cm2 into an oxide semiconductor and single-crystalline TiO2 [...] Read more.
Magnetic nanoparticles embedded into semiconductors have current perspectives for use in semiconducting spintronics. In this work, 40 keV Fe+ ions were implanted in high fluences of (0.5 ÷ 1.5) × 1017 ion/cm2 into an oxide semiconductor and single-crystalline TiO2 plates of rutile structure with (100) or (001) face orientations. Microstructure, elemental-phase composition, and magnetic properties of the Fe-ion-implanted TiO2 were studied by scanning and transmission electron microscopies (SEM and TEM), X-ray photoelectron (XPS) and Rutherford backscattering (RBS) spectroscopies, as well as vibrating-sample magnetometry (VSM). The high-fluence ion implantation results in the formation of magnetic nanoparticles of metallic iron beneath the irradiated surface of rutile. The induced ferromagnetism and observed two- or four-fold magnetic anisotropy are associated with the endotaxial growth of Fe nanoparticles oriented along the crystallographic axes of TiO2. Full article
(This article belongs to the Special Issue Feature Papers on "Hybrid and Composite Crystalline Materials" 2023–2024)
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12 pages, 3362 KiB  
Article
The Role of Intermediate Phases in the Crystallization of Aluminophosphate Sieves on Examples of AlPO-11 and AlPO-41
by Marat R. Agliullin, Aidar V. Fayzullin, Zulfiya R. Fayzullina and Boris I. Kutepov
Crystals 2023, 13(2), 227; https://doi.org/10.3390/cryst13020227 - 27 Jan 2023
Cited by 1 | Viewed by 1366
Abstract
The formation of intermediate phases during aging of the reaction gel composition 1.0Al2O3•1.0P2O5•1.5DPA•40H2O and its subsequent crystallization into molecular sieves AlPO-11 and AlPO-41 was studied in this work. The initial gels and crystallization [...] Read more.
The formation of intermediate phases during aging of the reaction gel composition 1.0Al2O3•1.0P2O5•1.5DPA•40H2O and its subsequent crystallization into molecular sieves AlPO-11 and AlPO-41 was studied in this work. The initial gels and crystallization products were characterized by XRD; MAS NMR 27Al and 31P; scanning electron microscopy (SEM); transmission electron microscopy (TEM); and N2-physical adsorption. It has been found that the nature of the aluminum source used to prepare the gel has a significant effect on the properties of the resulting intermediate phases. It is shown that by changing the chemical and phase composition of the intermediate aluminophosphate, it is possible to control the morphology and characteristics of the secondary porous structure of the AlPO-11 molecular sieve. The formation of the intermediate phases with a layered structure opens the possibility to synthesize high-phase purity AlPO-41 at the di-n-propylamine/Al2O3 ratio = 1.5. The formation mechanisms of AlPO-11 and AlPO-41 are proposed depending on the phase composition of the intermediate phases. Full article
(This article belongs to the Special Issue Feature Papers on "Hybrid and Composite Crystalline Materials" 2023–2024)
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15 pages, 5539 KiB  
Article
Phosphorus Recovery from Municipal Wastewater: Brucite from MgO Hydrothermal Treatment as Magnesium Source
by Panagiota D. Natsi, Konstantinos-Anastassios Goudas and Petros G. Koutsoukos
Crystals 2023, 13(2), 208; https://doi.org/10.3390/cryst13020208 - 23 Jan 2023
Cited by 3 | Viewed by 1870
Abstract
Crystallization of struvite (MgNH4PO4·6H2O, MAPH) for both N and P recovery from municipal wastewater is an attractive alternative. The low magnesium concentration in municipal wastewater calls for low-cost magnesium sources. In the present work, the precipitation of [...] Read more.
Crystallization of struvite (MgNH4PO4·6H2O, MAPH) for both N and P recovery from municipal wastewater is an attractive alternative. The low magnesium concentration in municipal wastewater calls for low-cost magnesium sources. In the present work, the precipitation of struvite from supersaturated solutions was investigated. The supersaturated solutions were prepared by the addition of either slurry of Mg(OH)2 (brucite) obtained from the hydrothermal treatment of magnesium oxide (MgO) or using the aqueous solution equilibrated with brucite after separation from the solid. In both cases, in the supersaturated solutions prepared by the addition of ammonium dihydrogen phosphate, the Mg:NH4:P ratio was 1:1:1, pH 7.0–11.0. The apparent order for the precipitation suggested that the dominant mechanism was surface diffusion according to the polynuclear model. The apparent rate constant for struvite precipitation was two orders of magnitude smaller for the slurry prepared supersaturated solution in comparison with the respective prepared from the brucite-equilibrated solution. Simulated wastewater (SWW), was supersaturated with respect to struvite, by inoculation with brucite. The apparent rate constant was two orders of magnitude higher than that corresponding to the supersaturated solutions prepared by the addition of solution equilibrated with brucite. The P recovery from SWW reached 70%. Full article
(This article belongs to the Special Issue Feature Papers on "Hybrid and Composite Crystalline Materials" 2023–2024)
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18 pages, 7663 KiB  
Article
Embracing [XY3]m– and [XY4]m– Anions in Salts of [M(bpy)3]q+
by Edwin C. Constable and Catherine E. Housecroft
Crystals 2023, 13(1), 97; https://doi.org/10.3390/cryst13010097 - 05 Jan 2023
Cited by 2 | Viewed by 1437
Abstract
[M(bpy)3]q+ cations (bpy = 2,2′-bipyridine) are archetypical coordination entities containing chelating bidentate N,N′-donor ligands. Each propeller-shaped cation is chiral, existing as a Δ or Λ enantiomer. The supramolecular chemistry of [M(bpy)3]q+ cations [...] Read more.
[M(bpy)3]q+ cations (bpy = 2,2′-bipyridine) are archetypical coordination entities containing chelating bidentate N,N′-donor ligands. Each propeller-shaped cation is chiral, existing as a Δ or Λ enantiomer. The supramolecular chemistry of [M(bpy)3]q+ cations in the crystal is dominated by cation-anion interactions and, to a lesser extent, weaker non-covalent interactions. Analysis of the data for [M(bpy)3]q+ salts in the Cambridge Structural Database (CSD) reveals a ubiquitous motif in which homochiral sheets of cations generate cavities for the accommodation of anions. A series of related and common motifs in the solid-state structures of [M(bpy)3]q+ salts has been identified. One of the commonest motifs comprises a hexagon of six cations with anions either in the center or lying above and/or below the centroid. Full article
(This article belongs to the Special Issue Feature Papers on "Hybrid and Composite Crystalline Materials" 2023–2024)
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