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Recent Advances in Mesoporous Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: closed (30 April 2020) | Viewed by 5853

Special Issue Editor


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Guest Editor
Universitat Hamburg, Hamburg, Germany
Interests: physisorption; mesoporous (organo)silicas; host–guest chemistry; pseudomorphic transformation

Special Issue Information

Dear Colleagues,

For over a quarter of a decade, mesoporous materials have fascinated researchers from all over the world. The reason for this might be the variability of compounds: in the beginning, starting from pure silica and other binary oxides, and, eventually, reaching carbons, organic functionalized materials and many other compounds. Additionally, the (mostly) simplicity of the synthesis route involving either endo- or exotemplating, or the special size range of the pores—think big, think nano—may be the cause. The unifying basic idea is the desired utilization, since all these materials can function as size limiting reactors, confining matrices, carriers or support materials in many applicational fields.

It is not possible to cover all aspects of these astonishing group of materials in one journal issue. That is why this Special Issue will focus on recent advances in mesoporous materials with a special emphasis on new mesoporous materials (meaning either chemical compounds that are received in a mesoporous form for the first time or established materials that are received in a previously unknown mesoporous structure) or new synthesis routes on the one hand and all sorts of special properties, interactions and confinement effects of guest materials inside the respective pore system on the other. With this focus we hope to gather contributions from working groups from all over the world that come either from a pure synthetic approach, as well as groups that have specialized in characterization of new and exciting properties.

Dr. Felix J. Brieler
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. Materials is an international peer-reviewed open access semimonthly 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

  • new mesoporous materials
  • new structures
  • confinement effects
  • host-guest-interaction
  • special properties

Published Papers (2 papers)

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9 pages, 1116 KiB  
Article
Hollow Silica Cubes with Customizable Porosity
by Samuel Hugh Gallagher, Olivier Trussardi, Oliver Lipp and Dominik Brühwiler
Materials 2020, 13(11), 2474; https://doi.org/10.3390/ma13112474 - 29 May 2020
Cited by 4 | Viewed by 2574
Abstract
Hollow silica cubes were synthesized by a deposition of a thin silica shell onto micrometer-sized hematite cubes. Ordered mesopores with well-defined pore diameters of 2.8 nm and 3.8 nm were introduced into the silica shell by means of pseudomorphic transformation after removal of [...] Read more.
Hollow silica cubes were synthesized by a deposition of a thin silica shell onto micrometer-sized hematite cubes. Ordered mesopores with well-defined pore diameters of 2.8 nm and 3.8 nm were introduced into the silica shell by means of pseudomorphic transformation after removal of the hematite core. The particles retained their cubic morphology upon pseudomorphic transformation, allowing for the preparation of close-packed layers of the hollow mesoporous silica cubes by drop-casting and the visualization of the hollow core by focused ion beam scanning electron microscopy. Full article
(This article belongs to the Special Issue Recent Advances in Mesoporous Materials)
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29 pages, 6490 KiB  
Article
The Effect of SBA-15 Surface Modification on the Process of 18β-Glycyrrhetinic Acid Adsorption: Modeling of Experimental Adsorption Isotherm Data
by Michał Moritz and Małgorzata Geszke-Moritz
Materials 2019, 12(22), 3671; https://doi.org/10.3390/ma12223671 - 07 Nov 2019
Cited by 13 | Viewed by 2957
Abstract
This study aimed at the adsorption of 18β-glycyrrhetinic acid (18β-GA), a pentacyclic triterpenoid derivative of oleanane type, onto functionalized mesoporous SBA-15 silica and non-porous silica (Aerosil®) as the reference adsorbent. Although 18β-GA possesses various beneficial pharmacological properties including antitumor, anti-inflammatory, and [...] Read more.
This study aimed at the adsorption of 18β-glycyrrhetinic acid (18β-GA), a pentacyclic triterpenoid derivative of oleanane type, onto functionalized mesoporous SBA-15 silica and non-porous silica (Aerosil®) as the reference adsorbent. Although 18β-GA possesses various beneficial pharmacological properties including antitumor, anti-inflammatory, and antioxidant activity, it occurs is small amounts in plant materials. Thus, the efficient methods of this bioactive compound enrichment from vegetable raw materials are currently studied. Siliceous adsorbents were functionalized while using various alkoxysilane derivatives, such as (3-aminopropyl)trimethoxysilane (APTMS), [3-(methylamino)propyl]trimethoxysilane (MAPTMS), (N,N-dimethylaminopropyl)trimethoxysilane (DMAPTMS), and [3-(2-aminothylamino)propyl] trimethoxysilane (AEAPTMS). The effect of silica surface modification with agents differing in the structure and the order of amine groups on the adsorption capacity of the adsorbent and adsorption efficiency were thoroughly examined. The equilibrium adsorption data were analyzed while using the Langmuir, Freundlich, Redlich-Peterson, Temkin, Dubinin-Radushkevich, and Dubinin-Astakhov isotherms. Both linear regression and nonlinear fitting analysis were employed in order to find the best-fitted model. The adsorption isotherms of 18β-GA onto silicas functionalized with APTMS, MAPTMS, and AEAPTMS indicate the Langmuir-type adsorption, whereas sorbents modified with DMAPTMS show the constant distribution of the adsorbate between the adsorbent and the solution regardless of silica type. The Dubinin-Astakhov, Dubinin-Radushkevich, and Redlich-Peterson equations described the best the process of 18β-GA adsorption onto SBA-15 and Aerosil® silicas that were functionalized with APTMS, MAPTMS, and AEAPTMS, regardless of the method that was used for the estimation of isotherm parameters. Based on nonlinear fitting analysis (Dubinin-Astakhov model), it can be concluded that SBA-15 sorbent that was modified with APTMS, MAPTMS, and AEAPTMS is characterized by twice the adsorption capacity (202.8–237.3 mg/g) as compared to functionalized non-porous silica (118.2–144.2 mg/g). Full article
(This article belongs to the Special Issue Recent Advances in Mesoporous Materials)
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