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Gels
Special Issues
Characterization and Applications of Aerogels
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Characterization and Applications of Aerogels

A special issue of Gels (ISSN 2310-2861). This special issue belongs to the section "Gel Applications".

Deadline for manuscript submissions: 30 June 2024 | Viewed by 2570

Special Issue Editors

Dr. Chengbin Yu

E-Mail Website
Guest Editor
Department of Mechanical and Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
Interests: polymer composite; porous materials; energy storage; thermal transformation
Prof. Dr. Youngseok Song

E-Mail Website
Guest Editor
Department of Fiber Convergence Materials Engineering, Dankook University, Gyeonggi Do 16890, Republic of Korea
Interests: nanocomposites; polymer-based composites; microscale polymer processing

Special Issue Information

Dear Colleagues,

This Special Issue is supposed to construct a new research area in porous materials technology. It is highly attractive for the fabrication of 3D aerogels due to the application of the infiltration method. The typical property of aerogels is that they exhibit nearly 100% porosity to light, and they are widely utilized as supporting materials. Thus, 3D-porous-aerogel-supported polymer composites are easy to fabricate and keep the polymers’ intrinsic properties. Graphene aerogels are widely utilized in various research applications, especially in forming stable phase change materials (PCMs). Although PCMs can absorb or release a large amount of thermal energy during the phase transition process, the leakage problem restricts the general utilization of stored thermal energy. Graphene aerogels with porous structures are considered containers that infiltrate plenty of working material into the internal porous volume space to sustain the initial solid state under the melting and cooling processes. In addition, the high weight fraction of working material can deliver thermal energy efficiently, with a perspective to solar cell technology and waste heat recovery applications.

Dr. Chengbin Yu
Prof. Dr. Youngseok Song
Guest Editors

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. Gels 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 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

  • porous materials
  • graphene aerogels
  • phase change materials
  • thermal energy
  • solar cell
  • waste heat recovery

Published Papers (2 papers)

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Research

14 pages, 13246 KiB  
Article
Investigation of Gelation Techniques for the Fabrication of Cellulose Aerogels
by Natalia Menshutina, Olga Fedotova, Kseniya Trofimova and Pavel Tsygankov
Gels 2023, 9(12), 919; https://doi.org/10.3390/gels9120919 - 21 Nov 2023
Viewed by 1065
Abstract
Because of the pronounced degradation of the environment, there has been an escalated demand for the fabrication of eco-friendly and highly efficient products derived from renewable sources. Cellulose aerogels have attracted significant interest attributable to their structural characteristics coupled with biodegradability and biocompatibility. [...] Read more.
Because of the pronounced degradation of the environment, there has been an escalated demand for the fabrication of eco-friendly and highly efficient products derived from renewable sources. Cellulose aerogels have attracted significant interest attributable to their structural characteristics coupled with biodegradability and biocompatibility. The features of the molecular structure of cellulose allow for the use of various methods in the production of gels. For instance, the presence of hydroxyl groups on the cellulose surface allows for chemical crosslinking via etherification reactions. On the other hand, cellulose gel can be procured by modulating the solvent power of the solvent. In this study, we investigate the impact of the gelation methodology on the structural attributes of aerogels. We present methodologies for aerogel synthesis employing three distinct gelation techniques: chemical crosslinking, cryotropic gelation, and CO2-induced gelation. The outcomes encompass data derived from helium pycnometry, Fourier-transform infrared spectroscopy, nitrogen porosimetry, and scanning electron microscopy. The resultant specimens exhibited a mesoporous fibrous structure. It was discerned that specimens generated through cryotropic gelation and CO2-induced gelation manifested higher porosity (93–95%) and specific surface areas (199–413 m2/g) in contrast to those produced via chemical crosslinking (porosity 72–95% and specific surface area 25–133 m2/g). Hence, this research underscores the feasibility of producing cellulose-based aerogels with enhanced characteristics, circumventing the necessity of employing toxic cross-linking agents. The process of gel formation through chemical crosslinking enables the creation of gels with enhanced mechanical properties and a more resilient structure. Two alternative methodologies prove particularly advantageous in applications necessitating biocompatibility and high porosity. Notably, CO2-induced gelation has not been hitherto addressed in the literature as a means to produce cellulose gels. The distinctive feature of this approach resides in the ability to combine the stages of obtaining an aerogel in one apparatus. Full article
(This article belongs to the Special Issue Characterization and Applications of Aerogels)
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18 pages, 16391 KiB  
Article
Adsorption Ability of Graphene Aerogel and Reduced Graphene Aerogel toward 2,4-D Herbicide and Salicylic Acid
by Alexandra Yu. Kurmysheva, Oleg Yanushevich, Natella Krikheli, Olga Kramar, Marina D. Vedenyapina, Pavel Podrabinnik, Nestor Washington Solís Pinargote, Anton Smirnov, Ekaterina Kuznetsova, Vladislav V. Malyavin, Pavel Peretyagin and Sergey N. Grigoriev
Gels 2023, 9(9), 680; https://doi.org/10.3390/gels9090680 - 23 Aug 2023
Cited by 3 | Viewed by 950
Abstract
Within this work, new aerogels based on graphene oxide are proposed to adsorb salicylic acid (SA) and herbicide 2,4-Dichlorophenoxyacetic acid (2,4-D) from aqueous media. Graphene oxide aerogel (GOA) and reduced graphene oxide aerogel (rGOA) were obtained by freeze-drying processes and then studied by [...] Read more.
Within this work, new aerogels based on graphene oxide are proposed to adsorb salicylic acid (SA) and herbicide 2,4-Dichlorophenoxyacetic acid (2,4-D) from aqueous media. Graphene oxide aerogel (GOA) and reduced graphene oxide aerogel (rGOA) were obtained by freeze-drying processes and then studied by Raman spectroscopy, Fourier-transform infrared spectroscopy (FT-IR), and Brunauer–Emmett–Teller (BET) analysis. The influence of contact time and the concentration of the adsorbates were also assessed. It was found that equilibrium for high adsorption is reached in 150 min. In a single system, the pseudo-first-order, pseudo-second-order kinetic models, Intraparticle diffusion, and Elovich models were used to discuss the detail of the aerogel adsorbing pollutant. Moreover, the Langmuir, Freundlich, and Temkin adsorption models were applied to describe the equilibrium isotherms and calculate the isotherm constants. Full article
(This article belongs to the Special Issue Characterization and Applications of Aerogels)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Synthesis of Cobalt Aerogels as Efficient Electrode Materials for Supercapacitor Applications

Authors: Ramya Ramkumar, Tensangmu Lama Tamang, Pitchaimani Veerakumar, Sanghyun Yu, Jae-Jin Shim and Woo Kyoung Kim

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