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Porous Support Materials

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

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 12775

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CERENA, Chemical Engineering Department, Instituto Superior Técnico (IST), Universidade de Lisboa, Lisboa, Portugal
Interests: technology platform on microencapsulation and immobilization
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Porous support materials are key enablers in many emerging technologies, such as long-lasting batteries, catalytic systems with large reactant diffusivity and product selectivity, resorbable biomedical scaffolds with drug delivery functionality, gas separation membranes with high selectivity and permeability, etc. According to the International Union of Pure and Applied Chemistry definition, pores in these materials are classified into micropores (<2 nm), mesopores (2–50 nm), and macropores (>50 nm). In certain applications, hierarchical pores across multiple length scales are desirable, and a precise control over porous structures, composition, surface properties and end functions is key for their employment in emerging opportunities. Machine learning and data science are promising tools to propel the development of porous support materials, by collecting and analyzing enormous combinations of materials metrics.

Porous monolithic materials are easily handled without fixation or enclosure when compared with porous powdery or layered materials; however, these latter ones can fill containers of any shape, enabling more flexibility in terms of the processes and experimental set-ups.

In light of the surging research on porous materials, this Special Issue of Materials aims to publish original high-quality research papers, as well as comprehensive reviews and significant preliminary communications, covering the most recent advances in the field of micro, meso and macroporous materials, either of inorganic or organic nature, with potential application as support materials or scaffolds.

Potential topics include but are not limited to:

  • Design and synthesis of organic molecules and resulting porous materials;
  • Functionalization of porous materials, aimed at controlled physical and chemical interactions of molecules with pore surfaces;
  • Modification of porous materials, including chemicals´ immobilization studies;
  • Emerging applications of porous support materials to (photo)catalysis, biomedical scaffolds, separation, filtration, energy storage, drug delivery, among others;
  • Covalent organic frameworks (COFs), metal-organic frameworks (MOFs), spherical microscaffolds;
  • Multifunctionality, recyclability and applicability under extreme conditions of porous support materials;
  • New experimental set-ups with practical applicability where porous support materials can be employed;
  • Critical assessments and emerging directions in research, based on the use of porous support materials;
  • Data science-assisted development of emerging porous support materials.

Prof. Dr. Ana Marques
Guest Editor

Manuscript Submission Information

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Keywords

  • porous support materials
  • scaffolds
  • macroporosity
  • mesoporosity
  • microporosity
  • MOFs
  • COFs
  • microspheres
  • microscaffolds
  • organic porous materials
  • sol-gel
  • chemical immobilization
  • sustainability
  • data science

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Published Papers (3 papers)

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Research

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15 pages, 3392 KiB  
Article
A Low-Cost, Portable, and Wireless In-Shoe System Based on a Flexible Porous Graphene Pressure Sensor
by Tianrui Cui, Le Yang, Xiaolin Han, Jiandong Xu, Yi Yang and Tianling Ren
Materials 2021, 14(21), 6475; https://doi.org/10.3390/ma14216475 - 28 Oct 2021
Cited by 13 | Viewed by 2781
Abstract
Monitoring gait patterns in daily life will provide a lot of biological information related to human health. At present, common gait pressure analysis systems, such as pressure platforms and in-shoe systems, adopt rigid sensors and are wired and uncomfortable. In this paper, a [...] Read more.
Monitoring gait patterns in daily life will provide a lot of biological information related to human health. At present, common gait pressure analysis systems, such as pressure platforms and in-shoe systems, adopt rigid sensors and are wired and uncomfortable. In this paper, a biomimetic porous graphene–SBR (styrene-butadiene rubber) pressure sensor (PGSPS) with high flexibility, sensitivity (1.05 kPa−1), and a wide measuring range (0–150 kPa) is designed and integrated into an insole system to collect, process, transmit, and display plantar pressure data for gait analysis in real-time via a smartphone. The system consists of 16 PGSPSs that were used to analyze different gait signals, including walking, running, and jumping, to verify its daily application range. After comparing the test results with a high-precision digital multimeter, the system is proven to be more portable and suitable for daily use, and the accuracy of the waveform meets the judgment requirements. The system can play an important role in monitoring the safety of the elderly, which is very helpful in today’s society with an increasingly aging population. Furthermore, an intelligent gait diagnosis algorithm can be added to realize a smart gait monitoring system. Full article
(This article belongs to the Special Issue Porous Support Materials)
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17 pages, 77224 KiB  
Article
The 3D-Printed Honeycomb Metamaterials Tubes with Tunable Negative Poisson’s Ratio for High-Performance Static and Dynamic Mechanical Properties
by Chunxia Guo, Dong Zhao, Zhanli Liu, Qian Ding, Haoqiang Gao, Qun Yan, Yongtao Sun and Fuguang Ren
Materials 2021, 14(6), 1353; https://doi.org/10.3390/ma14061353 - 11 Mar 2021
Cited by 22 | Viewed by 3770
Abstract
The synthesized understanding of the mechanical properties of negative Poisson’s ratio (NPR) convex–concave honeycomb tubes (CCHTs) under quasi-static and dynamic compression loads is of great significance for their multifunctional applications in mechanical, aerospace, aircraft, and biomedical fields. In this paper, the quasi-static and [...] Read more.
The synthesized understanding of the mechanical properties of negative Poisson’s ratio (NPR) convex–concave honeycomb tubes (CCHTs) under quasi-static and dynamic compression loads is of great significance for their multifunctional applications in mechanical, aerospace, aircraft, and biomedical fields. In this paper, the quasi-static and dynamic compression tests of three kinds of 3D-printed NPR convex–concave honeycomb tubes are carried out. The sinusoidal honeycomb wall with equal mass is used to replace the cell wall structure of the conventional square honeycomb tube (CSHT). The influence of geometric morphology on the elastic modulus, peak force, energy absorption, and damage mode of the tube was discussed. The experimental results show that the NPR, peak force, failure mode, and energy absorption of CCHTs can be adjusted by changing the geometric topology of the sinusoidal element. Through the reasonable design of NPR, compared with the equal mass CSHTs, CCHTs could have the comprehensive advantages of relatively high stiffness and strength, enhanced energy absorption, and damage resistance. The results of this paper are expected to be meaningful for the optimization design of tubular structures widely used in mechanical, aerospace, vehicle, biomedical engineering, etc. Full article
(This article belongs to the Special Issue Porous Support Materials)
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Review

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50 pages, 17858 KiB  
Review
Macroporosity Control by Phase Separation in Sol-Gel Derived Monoliths and Microspheres
by Ana C. Marques and Mário Vale
Materials 2021, 14(15), 4247; https://doi.org/10.3390/ma14154247 - 29 Jul 2021
Cited by 10 | Viewed by 4906
Abstract
Macroporous and hierarchically macro/mesoporous materials (mostly monoliths and microspheres) have attracted much attention for a variety of applications, such as supporting or enabling materials in chromatography, energy storage and conversion, catalysis, biomedical devices, drug delivery systems, and environmental remediation. A well-succeeded method to [...] Read more.
Macroporous and hierarchically macro/mesoporous materials (mostly monoliths and microspheres) have attracted much attention for a variety of applications, such as supporting or enabling materials in chromatography, energy storage and conversion, catalysis, biomedical devices, drug delivery systems, and environmental remediation. A well-succeeded method to obtain these tailored porous materials relies on the sol-gel technique, combined with phase separation by spinodal decomposition, and involves as well emulsification as a soft template, in the case of the synthesis of porous microspheres. Significant advancements have been witnessed, in terms of synthesis methodologies optimized either for the use of alkoxides or metal–salts and material design, including the grafting or immobilization of a specific species (or nanoparticles) to enable the most recent trends in technological applications, such as photocatalysis. In this context, the evolution, in terms of material composition and synthesis strategies, is discussed in a concerted fashion in this review, with the goal of inspiring new improvements and breakthroughs in the framework of porous materials. Full article
(This article belongs to the Special Issue Porous Support Materials)
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