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Molecular Scale Design, Synthesis, and Application of Macroporous, Mesoporous, and Microporous Materials

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Materials Science".

Deadline for manuscript submissions: 20 January 2025 | Viewed by 2195

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Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Científicas, C/Kelsen 5, 28049 Madrid, Spain
Interests: functional ceramic materials; synthesis and characterization; applications; photoluminescene; photocatalysis; energy production and storage
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Special Issue Information

Dear Colleagues,

Macro-, meso- and microporous membranes are widely used for separation and catalysis in the fields of food processing, biotechnology, pharmaceuticals, petrochemicals, and many more besides. In addition, they are also employed in production and energy storage. They can be tailored to provide different types of architecture, which requires the use of novel designs and specific synthesis methods. The optimal membrane microstructure consists of desirable pore sizes, a sharp pore size distribution, good pore interconnectivity and porosity, large surface areas, and an absence of defects. Furthermore, the design of three-dimensional materials with multiscale pore architecture represents an ongoing challenge. Chemistry provides the knowledge required to design and create new materials and the study of physics provides the necessary knowledge to understand their characteristics and properties for specific applications.

This Special Issue welcomes original research papers and reviews on the design, preparation and application of macro-, meso- and microporous materials. This Special Issue focuses on researching these porous materials at the molecular level, with a specific focus on mechanistic studies.

Dr. María Teresa Colomer
Guest Editor

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Keywords

  • macro-, meso- and microporous
  • porous materials
  • molecular design
  • adsorption
  • porous organic frameworks

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Published Papers (2 papers)

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Research

18 pages, 7608 KiB  
Article
Study of Mesostructured CeO2 Synthesis via Nanocasting Using SBA-15 as a Template: Influence of the Cerium Precursor
by Álvaro Moreno de la Calle, Arturo J. Vizcaíno, Alicia Carrero, José A. Calles and Pedro J. Megía
Int. J. Mol. Sci. 2024, 25(23), 13016; https://doi.org/10.3390/ijms252313016 - 3 Dec 2024
Viewed by 451
Abstract
Mesoporous materials with high surface area, large pore volume, and adjustable pore size are promising in the fields of adsorption and heterogeneous catalysis. In this work, ordered mesoporous ceria structures were successfully prepared via nanocasting using SBA-15 as a template, with Ce(NO3 [...] Read more.
Mesoporous materials with high surface area, large pore volume, and adjustable pore size are promising in the fields of adsorption and heterogeneous catalysis. In this work, ordered mesoporous ceria structures were successfully prepared via nanocasting using SBA-15 as a template, with Ce(NO3)3·6H2O or CeCl3·7H2O as ceria precursors. The materials were characterized before and after template removal. The CeO2 crystallite size in the CeO2/SBA-15 composites increases with successive impregnations until it reaches the pore size of the SBA-15. Upon removal of the SBA-15 template, the synthesized materials exhibit pore diameters corresponding to the wall thickness of the SBA-15, evidencing that the inverted structure was obtained. Mesoporous ceria exhibits increasingly ordered structure up to five successive impregnations with 1.3 mmolCe/gSBA-15. Using cerium chloride as a precursor, highly ordered structures were reached after only three impregnations. The feasibility of this synthesis in fewer steps (1, 3, and 5), employing the same amount of Ce precursor (6.7 mmolCe/gSBA-15), was also studied. Results show a higher ordering degree and oxygen mobility capacity at higher impregnation steps. The mesostructured ceria samples exhibit significantly higher oxygen mobility than commercial bulk ceria, along with high thermal stability, which highlights the usefulness of these structures. Full article
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11 pages, 2387 KiB  
Article
The Facile Synthesis and Application of Mesoporous Silica Nanoparticles with a Vinyl Functional Group for Plastic Recycling
by Jong-tak Lee, Misun Kang and Jae Young Bae
Int. J. Mol. Sci. 2024, 25(4), 2295; https://doi.org/10.3390/ijms25042295 - 15 Feb 2024
Cited by 1 | Viewed by 1165
Abstract
Due to growing concerns about environmental pollution from plastic waste, plastic recycling research is gaining momentum. Traditional methods, such as incorporating inorganic particles, increasing cross-linking density with peroxides, and blending with silicone monomers, often improve mechanical properties but reduce flexibility for specific performance [...] Read more.
Due to growing concerns about environmental pollution from plastic waste, plastic recycling research is gaining momentum. Traditional methods, such as incorporating inorganic particles, increasing cross-linking density with peroxides, and blending with silicone monomers, often improve mechanical properties but reduce flexibility for specific performance requirements. This study focuses on synthesizing silica nanoparticles with vinyl functional groups and evaluating their mechanical performance when used in recycled plastics. Silica precursors, namely sodium silicate and vinyltrimethoxysilane (VTMS), combined with a surfactant, were employed to create pores, increasing silica’s surface area. The early-stage introduction of vinyl functional groups prevented the typical post-synthesis reduction in surface area. Porous silica was produced in varying quantities of VTMS, and the synthesized porous silica nanomaterials were incorporated into recycled polyethylene to induce cross-linking. Despite a decrease in surface area with increasing VTMS content, a significant surface area of 883 m2/g was achieved. In conclusion, porous silica with the right amount of vinyl content exhibited improved mechanical performance, including increased tensile strength, compared to conventional porous silica. This study shows that synthesized porous silica with integrated vinyl functional groups effectively enhances the performance of recycled plastics. Full article
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