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Membranes
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Latest Development of Carbon Membranes
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Latest Development of Carbon Membranes

A special issue of Membranes (ISSN 2077-0375). This special issue belongs to the section "Inorganic Membranes".

Deadline for manuscript submissions: closed (20 May 2022) | Viewed by 8976

Special Issue Editor

Dr. Yuhe Cao

E-Mail Website
Guest Editor
Ralph E. Martin Department of Chemical Engineering, University of Arkansas, Fayetteville, AR, USA
Interests: separation; membrane; activated carbon; super capacitor; adsorption

Special Issue Information

Dear Colleagues, 

Carbon membranes have been fabricated and investigated from a variety of precursors, including polymer, coal, low-dimensional carbon material (graphene, carbon nanotube, and graphene oxide), etc. These carbon membranes have different applications based on the chemiphysical properties generated by the fabrication process, such as gas separation, energy storage, and water treatment. 

This Special Issue on the “Latest Development of Carbon Membrane of Membranes” in processes provides a collection of interdisciplinary work representative of the current development in the fields of carbon membrane science and technology. 

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following: carbon membrane formation, carbon membrane separation mechanism, carbon membrane application in the field of gas separation, energy storage, and water treatment.  

I look forward to receiving your contributions. 

Dr. Yuhe Cao
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. Membranes is an international peer-reviewed open access monthly 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 2700 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

  • carbon molecular sieve
  • membrane
  • gas separation
  • energy storage
  • water treatment

Published Papers (3 papers)

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Research

15 pages, 5176 KiB  
Article
Array of Graphene Variable Capacitors on 100 mm Silicon Wafers for Vibration-Based Applications
by Millicent N. Gikunda, Ferdinand Harerimana, James M. Mangum, Sumaya Rahman, Joshua P. Thompson, Charles Thomas Harris, Hugh O. H. Churchill and Paul M. Thibado
Membranes 2022, 12(5), 533; https://doi.org/10.3390/membranes12050533 - 19 May 2022
Cited by 5 | Viewed by 2630
Abstract
Highly flexible, electrically conductive freestanding graphene membranes hold great promise for vibration-based applications. This study focuses on their integration into mainstream semiconductor manufacturing methods. We designed a two-mask lithography process that creates an array of freestanding graphene-based variable capacitors on 100 mm silicon [...] Read more.
Highly flexible, electrically conductive freestanding graphene membranes hold great promise for vibration-based applications. This study focuses on their integration into mainstream semiconductor manufacturing methods. We designed a two-mask lithography process that creates an array of freestanding graphene-based variable capacitors on 100 mm silicon wafers. The first mask forms long trenches terminated by square wells featuring cone-shaped tips at their centers. The second mask fabricates metal traces from each tip to its contact pad along the trench and a second contact pad opposite the square well. A graphene membrane is then suspended over the square well to form a variable capacitor. The same capacitor structures were also built on 5 mm by 5 mm bare dies containing an integrated circuit underneath. We used atomic force microscopy, optical microscopy, and capacitance measurements in time to characterize the samples. Full article
(This article belongs to the Special Issue Latest Development of Carbon Membranes)
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15 pages, 3891 KiB  
Article
Preparation and Characterization of the Forward Osmosis Membrane Modified by MXene Nano-Sheets
by Yuqi Nie, Chaoxin Xie and Yi Wang
Membranes 2022, 12(2), 146; https://doi.org/10.3390/membranes12020146 - 25 Jan 2022
Cited by 8 | Viewed by 2566
Abstract
The Forward Osmosis (FO) membrane was the core of FO technology. Obtaining a high water flux while maintaining a low reverse solute flux has historically been considered the gold standard for a perfect FO membrane. In a thin-film composite FO membrane, the performance [...] Read more.
The Forward Osmosis (FO) membrane was the core of FO technology. Obtaining a high water flux while maintaining a low reverse solute flux has historically been considered the gold standard for a perfect FO membrane. In a thin-film composite FO membrane, the performance of the membrane was determined not only by the material and structure of the porous support layer but also by the structural and chemical properties of the active selective layer. Researchers have selected numerous sorts of materials for the FO membranes in recent years and have produced exceptional achievements. Herein, the performance of the modified FO membrane constructed by introducing new two-dimensional nanomaterial MXene nano-sheets to the interfacial polymerization process was investigated, and the performance of these modified membranes was investigated using a variety of characterization and testing methods. The results revealed that the MXene nano-sheets played an important role in improving the performance of the FO membrane. Because of the hydrophilic features of the MXene nano-sheets, the membrane structure may be tuned within a specific concentration range, and the performance of the modified FO membrane has been significantly enhanced accordingly. The optimal membrane water flux was boosted by around 80%, while its reverse solute flux was kept to a minimum of the resultant membranes. It showed that the addition of MXene nanosheets to the active selective layer could improve the performance of the FO membrane, and this method showed promising application prospects. Full article
(This article belongs to the Special Issue Latest Development of Carbon Membranes)
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14 pages, 4962 KiB  
Article
Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance
by Ruobing Yi, Bingquan Peng, Yimin Zhao, Dexi Nie, Liang Chen and Lei Zhang
Membranes 2022, 12(2), 125; https://doi.org/10.3390/membranes12020125 - 21 Jan 2022
Cited by 10 | Viewed by 2835
Abstract
The application of graphene oxide (GO)-based membranes combined with a quartz crystal microbalance (QCM) as a humidity sensor has attracted great interest over the past few years. Understanding the influence of the structure of the GO membrane (GOM) on the adsorption/desorption of water [...] Read more.
The application of graphene oxide (GO)-based membranes combined with a quartz crystal microbalance (QCM) as a humidity sensor has attracted great interest over the past few years. Understanding the influence of the structure of the GO membrane (GOM) on the adsorption/desorption of water molecules and the transport mechanism of water molecules in the membrane is crucial for development of applications using GOM-based humidity sensors. In this paper, by investigating the effects of oxygen-containing groups, flake size and interlayer spacing on the performance of humidity sensing, it was found that humidity-sensing performance could be improved by rational membrane-structure design and the introduction of magnesium ions, which can expand the interlayer spacing. Therefore, a novel HGO&GO&Mg2+ structure prepared by uniformly doping magnesium ions into GO&HGO thin composite membranes was designed for humidity sensing from 11.3% RH to 97.3% RH. The corresponding sensor exhibits a greatly improved humidity sensitivity (~34.3 Hz/%RH) compared with the original pure GO-based QCM sensor (~4.0 Hz/%RH). In addition, the sensor exhibits rapid response/recovery times (7 s/6 s), low hysteresis (~3.2%), excellent repeatability and good stability. This research is conducive to understanding the mechanism of GOM-based humidity sensors. Owing to its good humidity-sensing properties, the HGO&GO&Mg2+ membrane-based QCM humidity sensor is a good candidate for humidity sensing. Full article
(This article belongs to the Special Issue Latest Development of Carbon Membranes)
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