Aerogels

Hüsing, Nicola; Schubert, Ulrich S.

doi:10.1002/14356007.c01_c01

Cited by 8 publications

(2 citation statements)

References 139 publications

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“…This microstructure is similar to that of amine modified aerogels recently reported by the authors [58]. The evaluated structural properties allow to conclude that the prepared sample can be considered an aerogel, according to the different proposals for this definition [79, 81–83].…”

Section: Resultssupporting

confidence: 84%

A New Schiff Base Organically Modified Silica Aerogel-Like Material for Metal Ion Adsorption with Ni Selectivity

Vareda

Matos

Valente

et al. 2022

Adsorption Science & Technology

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Nickel has several industrial uses and is a valuable metal, making its selective separation and recycling a priority goal. A novel adsorbent, a Schiff base organically modified silica (ORMOSIL) aerogel, was prepared, for selective nickel removal from wastewater with other metal ions, by including a salen ionophore in the silica-based network. The newly developed adsorbent takes advantage of the salen’s selectivity and of the high porosity of silica aerogels. The aerogel-like adsorbent was prepared via sol-gel chemistry, using a coprecursor approach and ambient pressure drying. The inclusion of the Schiff base in the silica network was accomplished by reacting an amine-containing silica precursor with an aldehyde and confirmed by nuclear magnetic resonance (NMR) analysis. The adsorbent shrunk only 10% after evaporative drying, which resulted in a highly porous material (85% porosity, 4 cm3 g−1 specific pore volume). The low surface area of 28 m2 g-1 was due to the predominantly macroporous structure of the material (mean pore diameter of 563 nm). Adsorption isotherms and kinetic curves with single and binary mixtures of cations at room temperature were used to assess the selectivity of the adsorbent. The adsorption follows a BET (Brunauer-Emmett-Teller) trend. Due to the proximity of the oxygen and nitrogen atoms in the salen and steric hindrance from their neighboring atoms, it is likely that only the smallest hydrated cations can act as a coordination center and interact with both donor atoms. Thus, nickel was fairly removed (50 mg g-1), while other cations barely interacted with the adsorbent (cadmium adsorption maximum of 5 mg g-1). The estimated selectivity coefficient for nickel ranges from 1.8, in relation to copper, to 9.4 relatively to cadmium, which can be relevant for the separation of nickel in several industrial contexts, for instance, from electroplating sludge.

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Section: Resultssupporting

confidence: 84%

A New Schiff Base Organically Modified Silica Aerogel-Like Material for Metal Ion Adsorption with Ni Selectivity

Vareda

Matos

Valente

et al. 2022

Adsorption Science & Technology

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“…Kistler, the inventor of aerogel, defined aerogel as the gels in which the liquid inside is replaced by air, with negligible solid network shrinkage [138]. The International Union of Pure and Applied Chemistry (IUPAC) [139] and some authors, like Hüsing and Schubert [140], Leventis et al [141], Eychmüller et al [2], and Vareda et al [142], have also offered their definitions of aerogels. With the continuous expansion of the aerogels’ composition, properties, and application fields, their performance requirements are becoming more and more stringent.…”

Section: Development Status and Challengesmentioning

confidence: 99%

Silica aerogels: from materials research to industrial applications

Lin

et al. 2023

International Materials Reviews

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Silica aerogels are advanced materials with outstanding properties, including high specific surface area and porosity, low thermal conductivity, density, dielectric constant, and refractive index. However, the excellent properties of silica aerogels have shown limited utility in industrial applications, primarily as thermal insulation materials, where they hold only a small (1.1-2.6%) market share. The emergence of clean energy technologies stimulated renewed interest in silica and other aerogels. Here the recent advances in the production and applications of silica aerogels are summarized, and the current challenges and future development opportunities are discussed. The conventional and emerging syntheses and characterization methods of silica aerogels are introduced, followed by a discussion on thermophysical properties and potential applications. The fabrication processes of silica aerogels are analysed at different industry development stages. Recent advances in aerogels research are considered, highlighting the obstacles and possible solutions for the successful translation and industry uptake and focusing on the emerging applications in electric vehicles and building insulation.

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A review on aerogel: 3D nanoporous structured fillers in polymer‐based nanocomposites

et al. 2017

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There have been a number of review papers on layered silicate and carbon nanotube reinforced polymer nanocomposites, in which the fillers have high aspect ratios. Particulate‐polymer nanocomposites containing aerogel with extremely low density, large open pores, and high surface area are also an important class of polymer nanocomposites. Thus, this article provides an overview on the effect of aerogel on mechanical and thermal properties of polymer‐based nanocomposites. Moreover, the preparation, history, classification, and characteristics of the aerogel are addressed. Among the polymer‐aerogel nanocomposites, various categories including silica and carbon aerogel‐polymer nanocomposites were discussed in detail. POLYM. COMPOS., 39:3383–3408, 2018. © 2017 Society of Plastics Engineers

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Aerogels

Cited by 8 publications

References 139 publications

A New Schiff Base Organically Modified Silica Aerogel-Like Material for Metal Ion Adsorption with Ni Selectivity

A New Schiff Base Organically Modified Silica Aerogel-Like Material for Metal Ion Adsorption with Ni Selectivity

Silica aerogels: from materials research to industrial applications

A review on aerogel: 3D nanoporous structured fillers in polymer‐based nanocomposites

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