Functional Aerogels: Chemistry, Processing Strategies, and Advanced Applications

A Special Issue of Gels (ISSN 2310-2861) belonging to the section "Gel Chemistry and Physics".

Deadline for manuscript submissions: 30 November 2026 | Viewed by 721

Editors

School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China
Interests: aerogels; activated carbon; pyrolysis; adsorption; thermal insulation
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Guest Editor
School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: metal aerogels; hydrogels; nanoscience; electrocatalysis; smart materials
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Guest Editor
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Interests: battery thermal safety; aerogel thermal insulation materials
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Special Issue Information

Dear Colleagues,

In recent years, the field of aerogels has undergone a remarkable transformation, evolving from classical thermal super-insulators into a versatile and dynamic class of functional materials. This Special Issue is dedicated to exploring this interdisciplinary area where tailored chemistry, innovative processing strategies, and cutting-edge advanced applications converge to define the next generation of aerogels. The journey begins with molecular design—the precise engineering of composition using inorganic, organic, carbonaceous, or hybrid precursors, and the intentional grafting of functional groups to achieve targeted properties such as electrical conductivity, catalytic activity, and responsiveness to stimuli. However, translating these nanoscale designs into macroscopic, robust architectures presents a central challenge, making the processing strategy a critical pillar of research. This encompasses novel gelation routes, advanced drying techniques (from supercritical to ambient-pressure methods), and post-synthetic modifications that determine the material's integrity, form factor, and scalability. Ultimately, it is the synergy between chemistry and processing that unlocks unprecedented performance in advanced applications. We invite contributions that highlight topics such as functional aerogels in energy storage and conversion (e.g., batteries, supercapacitors, and catalysis), environmental technologies (e.g., adsorption, filtration, and sensing), and biomedicine. This issue aims to provide a comprehensive platform for sharing breakthroughs that address both fundamental questions and practical hurdles, fostering the development of aerogels that are not only structurally exquisite but also functionally transformative, addressing global technological challenges.

Dr. Song He
Prof. Dr. Ran Du
Dr. Yajun Huang
Guest Editors

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Keywords

  • aerogels
  • functional aerogels
  • energy storage and conversion
  • batteries
  • supercapacitors
  • catalysis
  • environmental technologies
  • adsorption
  • sensing
  • stimuli-responsiveness

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Published Papers (1 paper)

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Research

21 pages, 23405 KB  
Article
Synthesis of SiO2-Al2O3 Aerogel Powder via Low-Temperature Alkaline Fusion Activation of Potassium Feldspar
by Haoran Qian, Wenjie Cheng, Guiquan Zhou, Junliang Zhang and Song He
Gels 2026, 12(8), 680; https://doi.org/10.3390/gels12080680 - 1 Aug 2026
Viewed by 380
Abstract
This study proposes a process combining alkali-activated potassium feldspar, acid leaching, and sol–gel coupling with supercritical drying to prepare high-performance silica–alumina composite aerogel. The optimal parameters for potassium feldspar alkali-melt activation are a calcination temperature of 350 °C, mass ratio of potassium feldspar [...] Read more.
This study proposes a process combining alkali-activated potassium feldspar, acid leaching, and sol–gel coupling with supercritical drying to prepare high-performance silica–alumina composite aerogel. The optimal parameters for potassium feldspar alkali-melt activation are a calcination temperature of 350 °C, mass ratio of potassium feldspar to sodium hydroxide of 1:1.2, and calcination time of 120 min, achieving an acid-leaching efficiency of 97.3% for the activated potassium feldspar. The acid leachate, using propylene oxide as a gelling promoter, was processed through aging, solvent exchange, and supercritical drying to yield SiO2-Al2O3 aerogel with typical three-dimensional nanoporous network structure. EDS spectroscopy revealed that the spatial distributions of aluminum and silicon elements were highly coincident and uniformly dispersed. XPS and FTIR further confirmed the formation of Si-O-Al bonds, indicating that aluminum atoms were successfully incorporated into the silico-aluminate tetrahedral network, constructing silicon–aluminum composite framework. The SiO2-Al2O3 aerogel exhibits specific surface area of 660.841 m2/g and a pore volume of 1.321 cm3/g. Its mass loss within the 0–1000 °C range is only 9.55%, far lower than the 28% mass loss of pure aluminum oxide aerogel, indicating that the silicon–aluminum composite structure effectively suppresses high-temperature phase transitions and framework collapse. Full article
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