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Design and Applications of Nanoporous Materials
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Design and Applications of Nanoporous Materials

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

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 13369

Special Issue Editor

Prof. Dr. Takeshi Fujita

E-Mail Website
Guest Editor
School of Environmental Science and Engineering, Kochi University of Technology, Kami, Japan
Interests: nanoporous metal; electrocatalysis; photocatalysis; dealloying; gas conversion; transmission electron microscopy; high-entropy alloy
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanoporous materials have attracted a great amount of interest for many applications thanks to thei high surface area. Nanoporous metals prepared via dealloying or selective leaching of solid solution alloys represent an emerging class of materials such as catalysis, optical sensing, actuation or energy storage and conversion. Additionaly, MOFs (metal organic frameworks) are extensively investigated for advanced applications, including adsorption, gas storage/capture, drug delivery, catalysis, photocatalysis, and/or chemical sensing. Regarding structural design, additive manufacturing (AM) can be a new technology for building 3D functional materials by adding layer upon layer of several materials. By summing up these materials/technology, ultimate nanoporous materials could be achieved that could assist toward a sustainable society.

Therefore, considering the emerging character of nanoporous metal/MOF and additive manufacture, the aim of this Special Issue is to focus on recent advances of such nanoporous materials, from fundamental aspects to various applications. We also welcome contributions from theorists and computational scientists in this research field.

Prof. Dr. Takeshi Fujita
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

  • Nanoporous metal
  • MOF (metal organic frameworks)
  • Heterogeneous catalysis
  • Battery
  • Electrocatalysis
  • Photocatalysis
  • CO2 capture and utilization
  • Gas conversion (methane, exhaust gas)
  • Additive Manufacture (3D printer)
  • Structural hierarchy

Published Papers (5 papers)

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Research

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17 pages, 7606 KiB  
Article
A Stable and Indurative Superhydrophobic Film with Excellent Anti-Bioadhesive Performance for 6061 Al Protection
by Jie Liu, Xinwen Zhang, Ruoyun Wang, Fei Long and Lei Liu
Materials 2020, 13(23), 5564; https://doi.org/10.3390/ma13235564 - 06 Dec 2020
Cited by 6 | Viewed by 2324
Abstract
Superhydrophobic surfaces have attracted intensive attention in the antifouling field because of their excellent anti-bioadhesive performance and environmental friendliness. However, promising surfaces have met great challenges of poor mechanical robustness under harsh serving conditions. Herein, an organic-inorganic composite strategy, that the silane-modified TiO [...] Read more.
Superhydrophobic surfaces have attracted intensive attention in the antifouling field because of their excellent anti-bioadhesive performance and environmental friendliness. However, promising surfaces have met great challenges of poor mechanical robustness under harsh serving conditions. Herein, an organic-inorganic composite strategy, that the silane-modified TiO2 nanoparticles are compounded into the porous framework provided by the stable and indurative aluminum oxide film, is proposed to address the common serious problem in superhydrophobic surfaces. Different from the traditional superhydrophobic surfaces, this composite film possesses a ~18 μm thick layer which can provide strong support to silane-modified TiO2 nanoparticles. The resulting film can reserve superhydrophobicity to the surface even after a thickness loss of ~15 μm under continuous abrasion. At the same time, the results of the bacterial adhesive tests also verify that the film has the same long-term anti-bioadhesive performance. The film with superhydrophobicity, excellent anti-bioadhesive property, and stable robustness will make it a promising candidate for serving in a harsh environment, and the design concept of this film could be applied to various substrates. Full article
(This article belongs to the Special Issue Design and Applications of Nanoporous Materials)
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9 pages, 2728 KiB  
Communication
Bismuth/Porous Graphene Heterostructures for Ultrasensitive Detection of Cd (II)
by Luyi Huang, Yoshikazu Ito, Takeshi Fujita, Xingbo Ge, Ling Zhang and Heping Zeng
Materials 2020, 13(22), 5102; https://doi.org/10.3390/ma13225102 - 12 Nov 2020
Cited by 6 | Viewed by 1791
Abstract
Heavy metals pollution is one of the key problems of environment protection. Electrochemical methods, particularly anodic stripping voltammetry, have been proven a powerful tool for rapid detection of heavy metal ions. In the present work, a bismuth modified porous graphene (Bi@PG) electrode as [...] Read more.
Heavy metals pollution is one of the key problems of environment protection. Electrochemical methods, particularly anodic stripping voltammetry, have been proven a powerful tool for rapid detection of heavy metal ions. In the present work, a bismuth modified porous graphene (Bi@PG) electrode as an electrochemical sensor was adopted for the detection of heavy metal Cd2+ in an aqueous solution. Combining excellent electronic properties in sensitivity, peak resolution, and high hydrogen over-potential of bi-continuous porous Bi with the large surface-area and high conductivity on PG, the Bi@PG electrode exhibited excellent sensing ability. The square wave anodic stripping voltammetry response showed a perfect liner range of 10−9–10−8 M with a correlation coefficient of 0.9969. The limit of detection (LOD) and the limit of quantitation (LOQ) are calculated to be 0.1 and 0.34 nM with a sensitivity of 19.05 μA·nM−1, which is relatively excellent compared to other carbon-based electrodes. Meanwhile, the Bi@PG electrode showed tremendous potential in composite detection of multifold heavy metals (such as Pb2+ and Cd2+) and wider linear range. Full article
(This article belongs to the Special Issue Design and Applications of Nanoporous Materials)
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12 pages, 1920 KiB  
Article
Understanding the Detection Mechanisms and Ability of Molecular Hydrogen on Three-Dimensional Bicontinuous Nanoporous Reduced Graphene Oxide
by Yoshikazu Ito, Megumi Kayanuma, Yasuteru Shigeta, Jun-ichi Fujita and Yoichi Tanabe
Materials 2020, 13(10), 2259; https://doi.org/10.3390/ma13102259 - 14 May 2020
Viewed by 2182
Abstract
Environmental safety has become increasingly important with respect to hydrogen use in society. Monitoring techniques for explosive gaseous hydrogen are essential to ensure safety in sustainable hydrogen utilization. Here, we reveal molecular hydrogen detection mechanisms with monolithic three-dimensional nanoporous reduced graphene oxide under [...] Read more.
Environmental safety has become increasingly important with respect to hydrogen use in society. Monitoring techniques for explosive gaseous hydrogen are essential to ensure safety in sustainable hydrogen utilization. Here, we reveal molecular hydrogen detection mechanisms with monolithic three-dimensional nanoporous reduced graphene oxide under gaseous hydrogen flow and at room temperature. Nanoporous reduced graphene oxide significantly increased molecular hydrogen physisorption without the need to employ catalytic metals or heating. This can be explained by the significantly increased surface area in comparison to two-dimensional graphene sheets and conventional reduced graphene oxide flakes. Using this large surface area, molecular hydrogen adsorption behaviors were accurately observed. In particular, we found that the electrical resistance firstly decreased and then gradually increased with higher gaseous hydrogen concentrations. The resistance decrease was due to charge transfer from the molecular hydrogen to the reduced graphene oxide at adsorbed molecular hydrogen concentrations lower than 2.8 ppm; conversely, the resistance increase was a result of Coulomb scattering effects at adsorbed molecular hydrogen concentrations exceeding 5.0 ppm, as supported by density functional theory. These findings not only provide the detailed adsorption mechanisms of molecular hydrogen, but also advance the development of catalyst-free non-heated physisorption-type molecular detection devices. Full article
(This article belongs to the Special Issue Design and Applications of Nanoporous Materials)
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Review

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23 pages, 5170 KiB  
Review
Challenges and Opportunities for Integrating Dealloying Methods into Additive Manufacturing
by A. Chuang and J. Erlebacher
Materials 2020, 13(17), 3706; https://doi.org/10.3390/ma13173706 - 21 Aug 2020
Cited by 18 | Viewed by 4052
Abstract
The physical architecture of materials plays an integral role in determining material properties and functionality. While many processing techniques now exist for fabricating parts of any shape or size, a couple of techniques have emerged as facile and effective methods for creating unique [...] Read more.
The physical architecture of materials plays an integral role in determining material properties and functionality. While many processing techniques now exist for fabricating parts of any shape or size, a couple of techniques have emerged as facile and effective methods for creating unique structures: dealloying and additive manufacturing. This review discusses progress and challenges in the integration of dealloying techniques with the additive manufacturing (AM) platform to take advantage of the material processing capabilities established by each field. These methods are uniquely complementary: not only can we use AM to make nanoporous metals of complex, customized shapes—for instance, with applications in biomedical implants and microfluidics—but dealloying can occur simultaneously during AM to produce unique composite materials with nanoscale features of two interpenetrating phases. We discuss the experimental challenges of implementing these processing methods and how future efforts could be directed to address these difficulties. Our premise is that combining these synergistic techniques offers both new avenues for creating 3D functional materials and new functional materials that cannot be synthesized any other way. Dealloying and AM will continue to grow both independently and together as the materials community realizes the potential of this compelling combination. Full article
(This article belongs to the Special Issue Design and Applications of Nanoporous Materials)
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Other

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7 pages, 3066 KiB  
Letter
NiYAl-Derived Nanoporous Catalysts for Dry Reforming of Methane
by Syota Imada, Xiaobo Peng, Zexing Cai, Abdillah Sani Bin Mohd Najib, Masahiro Miyauchi, Hideki Abe and Takeshi Fujita
Materials 2020, 13(9), 2044; https://doi.org/10.3390/ma13092044 - 27 Apr 2020
Cited by 2 | Viewed by 2288
Abstract
Dry reforming of methane can be used for suppressing the rapid growth of greenhouse gas emissions. However, its practical implementation generally requires high temperatures. In this study, we report an optimal catalyst for low-temperature dry reforming of methane with high carbon coking resistance [...] Read more.
Dry reforming of methane can be used for suppressing the rapid growth of greenhouse gas emissions. However, its practical implementation generally requires high temperatures. In this study, we report an optimal catalyst for low-temperature dry reforming of methane with high carbon coking resistance synthesized from NiYAl alloy. A facile two-step process consisting of preferential oxidation and leaching was utilized to produce structurally robust nanoporous Ni metal and Y oxides from NiYAl4. The catalyst exhibited an optimal carbon balance (0.96) close to the ideal value of 1.0, indicating the optimized dry reforming pathway. This work proposes a facile route of the structural control of active metal/oxide sites for realizing highly active catalysts with long-term durability. Full article
(This article belongs to the Special Issue Design and Applications of Nanoporous Materials)
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