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Nanomaterials
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Nanoporous Materials for Catalysis, Molecule Separation and Nanodevices
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Nanoporous Materials for Catalysis, Molecule Separation and Nanodevices

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (20 January 2023) | Viewed by 8433

Special Issue Editor

Prof. Dr. Yajun Wang

E-Mail Website1 Website2
Guest Editor
College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325027, China
Interests: nanocomposite porous materials; hybrid materials; self-assembly; bio-oriented applications; drug delivery; molecular separation; (bio)sensing

Special Issue Information

Dear Colleagues,

This Special Issue aims to attract contributions covering the field of nanoporous materials, or more precisely, engineering of nanostructured porous materials with unique molecule separation properties and advanced catalytic performance. Porous materials have attracted wide interest in terms of both fundamental and applied research. The large internal surface area and adsorbent potential of porous materials have led to their widespread applications, such as in catalysis, separations, drug delivery, and sensing. Engineering of porous materials with dedicated pore structures and surface properties extends the scope of their applications by the incorporation of functional units either in the material frameworks or on the porous surface.  Over the last two decades, an interdisciplinary interest in these unique materials has emerged. This Special Issue aims to receive contributions (in the form of communications, full research articles, and reviews) to update the basis, applications, and perspectives of the functionalization of nanoporous materials with the applications focused on catalysis, molecule separation, and nanodevices.

The scope of the materials to be covered include but are not limited to the following:

  • Zeolites and mesoporous silicas;
  • Mesoporous carbons and mesoporous metal oxides;
  • Metal organic frameworks (MOFs) and covalent organic frameworks (COFs);
  • Membranes and hierarchically porous materials.

Prof. Dr. Yajun Wang
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. Nanomaterials 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 2900 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

  • nanoporous materials
  • mesoporous materials
  • catalysis
  • molecule separation
  • nanodevice
  • sensing

Published Papers (4 papers)

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Research

13 pages, 3008 KiB  
Article
Templated Assembly of pH-Labile Covalent Organic Framework Hierarchical Particles for Intracellular Drug Delivery
by Fangzhou Zhou, Yuanyuan Fang, Chao Deng, Qian Zhang, Minying Wu, Hsin-Hui Shen, Yi Tang and Yajun Wang
Nanomaterials 2022, 12(17), 3055; https://doi.org/10.3390/nano12173055 - 02 Sep 2022
Cited by 4 | Viewed by 2417
Abstract
Covalent organic frameworks (COF), a class of emerging microporous polymers, have been restrained for drug delivery applications due to their limited controllability over particle sizes and degradability. Herein, a dendritic mesoporous silica nanosphere (DMSN)-mediated growth strategy is proposed to fabricate hierarchical DMSN@COF hybrids [...] Read more.
Covalent organic frameworks (COF), a class of emerging microporous polymers, have been restrained for drug delivery applications due to their limited controllability over particle sizes and degradability. Herein, a dendritic mesoporous silica nanosphere (DMSN)-mediated growth strategy is proposed to fabricate hierarchical DMSN@COF hybrids through in situ growing of 1,3,5-tris(4-aminophenyl)benzene and 2,5-dimethoxyterephthaldehyde connected COF with acid cleavable C=N bonds. After the removal of the DMSN template, COF hierarchical particles (COF HP) with tailored particle sizes and degradability were obtained. Notably, the COF HP could be degraded by 55% after 24 h of incubation at pH 5.5, whereas the counterpart bulk COF only showed 15% of degradation in the same conditions. Due to the improved porosity and surface area, the COF HP can be utilized to load the chemotherapeutic drug, doxorubicin (DOX), with a high loading (46.8 wt%), outperforming the bulk COF (32.1 wt%). Moreover, around 90% of the loaded DOX can be discharged from the COF HP within 8 h of incubation at pH 5.5, whereas, only ~55% of the loaded DOX was released from the bulk COF. Cell experiments demonstrated that the IC50 value of the DOX loaded in COF HP was 2–3 times lower than that of the DOX loaded in the bulk COF and the hybrid DMSN@COF. Attributed to the high loading capacity and more pH-labile particle deconstruction properties, COF HP shows great potential in the application as vehicles for drug delivery. Full article
(This article belongs to the Special Issue Nanoporous Materials for Catalysis, Molecule Separation and Nanodevices)
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13 pages, 4326 KiB  
Article
Dendritic Mesoporous Silica Hollow Spheres for Nano-Bioreactor Application
by Qian Zhang, Minying Wu, Yuanyuan Fang, Chao Deng, Hsin-Hui Shen, Yi Tang and Yajun Wang
Nanomaterials 2022, 12(11), 1940; https://doi.org/10.3390/nano12111940 - 06 Jun 2022
Cited by 8 | Viewed by 2868
Abstract
Mesoporous silica materials have attracted great research interest for various applications ranging from (bio)catalysis and sensing to drug delivery. It remains challenging to prepare hollow mesoporous silica nanoparticles (HMSN) with large center-radial mesopores that could provide a more efficient transport channel through the [...] Read more.
Mesoporous silica materials have attracted great research interest for various applications ranging from (bio)catalysis and sensing to drug delivery. It remains challenging to prepare hollow mesoporous silica nanoparticles (HMSN) with large center-radial mesopores that could provide a more efficient transport channel through the cell for guest molecules. Here, we propose a novel strategy for the preparation of HMSN with large dendritic mesopores to achieve higher enzyme loading capacity and more efficient bioreactors. The materials were prepared by combining barium sulfate nanoparticles (BaSO4 NP) as a hard template and the in situ-formed 3-aminophenol/formaldehyde resin as a porogen for directing the dendritic mesopores’ formation. HMSNs with different particle sizes, shell thicknesses, and pore structures have been prepared by choosing BaSO4 NP of various sizes and adjusting the amount of tetraethyl orthosilicate added in synthesis. The obtained HMSN-1.1 possesses a high pore volume (1.07 cm3 g−1), a large average pore size (10.9 nm), and dendritic mesopores that penetrated through the shell. The advantages of HMSNs are also demonstrated for enzyme (catalase) immobilization and subsequent use of catalase-loaded HMSNs as bioreactors for catalyzing the H2O2 degradation reaction. The hollow and dendritic mesoporous shell features of HMSNs provide abundant tunnels for molecular transport and more accessible surfaces for molecular adsorption, showing great promise in developing efficient nanoreactors and drug delivery vehicles. Full article
(This article belongs to the Special Issue Nanoporous Materials for Catalysis, Molecule Separation and Nanodevices)
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16 pages, 3441 KiB  
Article
Facile Morphology and Porosity Regulation of Zeolite ZSM-5 Mesocrystals with Synergistically Enhanced Catalytic Activity and Shape Selectivity
by Feng Lin, Zhaoqi Ye, Lingtao Kong, Peng Liu, Yahong Zhang, Hongbin Zhang and Yi Tang
Nanomaterials 2022, 12(9), 1601; https://doi.org/10.3390/nano12091601 - 09 May 2022
Cited by 3 | Viewed by 2048
Abstract
The morphology and mesoporosity of zeolite are two vital properties to determine its performance in diverse applications involving adsorption and catalysis; while it remains a big challenge for the synthesis and regulation of zeolites with exceptional morphology/porosity only through inorganic-ions-based modification. Herein, by [...] Read more.
The morphology and mesoporosity of zeolite are two vital properties to determine its performance in diverse applications involving adsorption and catalysis; while it remains a big challenge for the synthesis and regulation of zeolites with exceptional morphology/porosity only through inorganic-ions-based modification. Herein, by simply optimizing the alkali metal type (K+ or Na+), as well as alkali/water ratio and crystallization temperature, the zeolite ZSM-5 mesocrystals with diverse mesostructures are simply and controllably prepared via fine-tuning the crystallization mechanism in an organotemplate-free, ions-mediated seed-assisted system. Moreover, the impacts of these key parameters on the evolution of seed crystals, the development and assembly behavior of aluminosilicate species and the solution-phase process during zeolite crystallization are investigated by means of directional etching in NH4F or NaOH solutions. Except for the morphology/mesoporosity modulation, their physical and chemical properties, such as particle size, microporosity, Si/Al ratio and acidity, can be well maintained at a similar level. As such, the p/o-xylene adsorption and catalytic performance of o-xylene isomerization are used to exhaustively evaluate the synergistically enhanced catalytic activity and shape selectivity of the obtained products. This work demonstrates the possibility of effectively constructing novel zeolite mesostructures by simply altering parameters on simple ions-controlled crystallization and provides good models to inspect the impacts of mesoporosity or morphology on their catalytic performances. Full article
(This article belongs to the Special Issue Nanoporous Materials for Catalysis, Molecule Separation and Nanodevices)
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13 pages, 4676 KiB  
Article
Concentrically Encapsulated Dual-Enzyme Capsules for Synergistic Metabolic Disorder Redressing and Cytotoxic Intermediates Scavenging
by Chao Deng, Xianghai Li, Qianru Jin and Deliang Yi
Nanomaterials 2022, 12(4), 625; https://doi.org/10.3390/nano12040625 - 12 Feb 2022
Cited by 1 | Viewed by 2570
Abstract
Enzyme therapy has important implications for the treatment of metabolic disorders and biological detoxification. It remains challenging to prepare enzymatic nanoreactors with high therapeutic efficiency and low emission of cytotoxic reaction intermediates. Here, we propose a novel strategy for the preparation of enzymes-loaded [...] Read more.
Enzyme therapy has important implications for the treatment of metabolic disorders and biological detoxification. It remains challenging to prepare enzymatic nanoreactors with high therapeutic efficiency and low emission of cytotoxic reaction intermediates. Here, we propose a novel strategy for the preparation of enzymes-loaded polypeptide microcapsules (EPM) with concentrically encapsulated enzymes to achieve higher cascade reaction rates and minimal emission of cytotoxic intermediates. Mesoporous silica spheres (MSS) are used as a highly porous matrix to efficiently load a therapeutic enzyme (glucose oxidase, GOx), and a layer-by-layer (LbL) assembly strategy is employed to assemble the scavenging enzyme (catalase) and polyelectrolyte multilayers on the MSS surface. After removal of the MSS, a concentrically encapsulated EPM is obtained with the therapeutic enzyme encapsulated inside the capsule, and the scavenging enzyme immobilized in the polypeptide multilayer shell. Performance of the concentrically encapsulated GOx-catalase capsules is investigated for synergistic glucose metabolism disturbance correction and cytotoxic intermediate H2O2 clearance. The results show that the EPM can simultaneously achieve 99% H2O2 clearance and doubled glucose consumption rate. This strategy can be extended to the preparation of other dual- or multi-enzyme therapeutic nanoreactors, showing great promise in the treatment of metabolic disorders. Full article
(This article belongs to the Special Issue Nanoporous Materials for Catalysis, Molecule Separation and Nanodevices)
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