Advances in Aerogel Composites

A special issue of Gels (ISSN 2310-2861).

Deadline for manuscript submissions: closed (31 May 2022) | Viewed by 8810

Special Issue Editor


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Guest Editor
School of Materials Science and Engineering, Hainan University, Haikou 570228, China
Interests: functionalization of natural polymers, including aerogels and hydrogel from natural polymers

Special Issue Information

Dear Colleagues,

As the lightest material in the world, interest in the application scope of, and the variety of materials related to, aerogels has significantly increased in recent decades. The source of aerogels has expanded from traditional organic and inorganic matter to biomass and natural polymers. The application scope of aerogels extends from insulation materials to drug carriers, environmental mediators, sorbents, supercapacitors, and catalysts. At the same time, there is a clear tendency in the aerogel community to combine different matrices by doping, co-gelation, or post-treatment in order to tailor the aerogel properties for a specific application. This is the path forward, which enables further commercialization of different aerogel types. It also brings important questions to the forefront: how do different compounds interact within an aerogel matrix to determine the properties of such a hybrid material? Can those properties be described or even predicted as a function of the aerogel composition? The further development and commercialization of many aerogel types is still slow. More effort and innovation are still required in this field. This Special Issue, entitled Advances in Aerogel Composites, aims to highlight recent advances in research on aerogel composites. We welcome submissions covering key aspects of aerogel composites from all facets, including fundamental studies and application-focused research. We hope this Special Issue can further improve the consensus on aerogel processing between aerogel scientists and accelerate research into the further potential applications of aerogels. 

Prof. Dr. Lingbin Lu
Guest Editor

Manuscript Submission Information

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Published Papers (2 papers)

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Research

14 pages, 4269 KiB  
Article
Robust SiO2–Al2O3/Agarose Composite Aerogel Beads with Outstanding Thermal Insulation Based on Coal Gangue
by Jie Gu, Chao Ji, Rui Fu, Xin Yang, Zhichen Wan, Lishuo Wen, Qiqi Song, Yinghui Liu, Yaxiong Wang and Huazheng Sai
Gels 2022, 8(3), 165; https://doi.org/10.3390/gels8030165 - 6 Mar 2022
Cited by 11 | Viewed by 3577
Abstract
Advanced SiO2–Al2O3 aerogel materials have outstanding potential in the field of thermal insulation. Nevertheless, the creation of a mechanically robust and low-cost SiO2–Al2O3 aerogel material remains a considerable challenge. In this study, SiO [...] Read more.
Advanced SiO2–Al2O3 aerogel materials have outstanding potential in the field of thermal insulation. Nevertheless, the creation of a mechanically robust and low-cost SiO2–Al2O3 aerogel material remains a considerable challenge. In this study, SiO2–Al2O3 aerogel based on coal gangue, which is a type of zero-cost inorganic waste, was constructed in porous agarose aerogel beads, followed by simple chemical vapor deposition of trimethylchlorosilane to fabricate SiO2–Al2O3/agarose composite aerogel beads (SCABs). The resulting SCABs exhibited a unique nanoscale interpenetrating network structure, which is lightweight and has high specific surface area (538.3 m2/g), hydrophobicity (approximately 128°), and excellent thermal stability and thermal insulation performance. Moreover, the compressive strength of the SCABs was dramatically increased by approximately a factor of ten compared to that of native SiO2–Al2O3 aerogel beads. The prepared SCABs not only pave the way for the design of a novel aerogel material for use in thermal insulation without requiring expensive raw materials, but also provide an effective way to comprehensively use coal gangue. Full article
(This article belongs to the Special Issue Advances in Aerogel Composites)
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11 pages, 2200 KiB  
Article
Preparation and Characterization of Nanocellulose/Chitosan Aerogel Scaffolds Using Chemical-Free Approach
by Samsul Rizal, Esam Bashir Yahya, H. P. S. Abdul Khalil, C. K. Abdullah, Marwan Marwan, Ikramullah Ikramullah and Umar Muksin
Gels 2021, 7(4), 246; https://doi.org/10.3390/gels7040246 - 2 Dec 2021
Cited by 38 | Viewed by 4710
Abstract
Biopolymer-based aerogels are open three-dimensional porous materials that are characterized by outstanding properties, such as a low density, high porosity and high surface area, in addition to their biocompatibility and non-cytotoxicity. Here we fabricated pure and binary blended aerogels from cellulose nanofibers (CNFs) [...] Read more.
Biopolymer-based aerogels are open three-dimensional porous materials that are characterized by outstanding properties, such as a low density, high porosity and high surface area, in addition to their biocompatibility and non-cytotoxicity. Here we fabricated pure and binary blended aerogels from cellulose nanofibers (CNFs) and chitosan (CS), using a chemical-free approach that consists of high-pressure homogenization and freeze-drying. The prepared aerogels showed a different porosity and density, depending on the material and mixing ratio. The porosity and density of the aerogels ranged from 99.1 to 90.8% and from 0.0081 to 0.141 g/cm3, respectively. Pure CNFs aerogel had the highest porosity and lightest density, but it showed poor mechanical properties and a high water absorption capacity. Mixing CS with CNFs significantly enhance the mechanical properties and reduce its water uptake. The two investigated ratios of aerogel blends had superior mechanical and thermal properties over the single-material aerogels, in addition to reduced water uptake and 2-log antibacterial activity. This green fabrication and chemical-free approach could have great potential in the preparation of biopolymeric scaffolds for different biomedical applications, such as tissue-engineering scaffolds. Full article
(This article belongs to the Special Issue Advances in Aerogel Composites)
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