Transparent silica aerogel slabs synthesized from nanoparticle colloidal suspensions at near ambient conditions on omniphobic liquid substrates.

Gels Nanoparticles Silicon Dioxide Suspensions Thermal Conductivity
Aerogel Ambigel Liquid substrate Mesoporous silica Optically transparent thermal insulation Silica nanoparticles

Journal

Journal of colloid and interface science
ISSN: 1095-7103
Titre abrégé: J Colloid Interface Sci
Pays: United States
ID NLM: 0043125

Informations de publication

Date de publication:
15 Jan 2022
Historique:
received: 21 04 2021
revised: 29 07 2021
accepted: 31 07 2021
pubmed: 29 8 2021
medline: 6 11 2021
entrez: 28 8 2021
Statut: ppublish

Résumé

This paper presents a novel sol-gel method to synthesize large and thick silica aerogel monoliths at near ambient conditions using a commercial aqueous solution of colloidal silica nanoparticles as building blocks. To achieve slabs with high visible transmittance and low thermal conductivity, the method combines the strategies of (i) synthesizing gels on an omniphobic perfluorocarbon liquid substrate, (ii) aging at temperatures above room temperature, and (iii) performing solvent exchange with a low-surface-tension organic solvent prior to ambient drying. The omniphobic liquid substrates were used to prevent cracking and ensure an optically-smooth surface, while nanoparticle building blocks were small (<10 nm) to limit volumetric light scattering. Gels were aged at temperatures between 25 and 80 °C for up to 21 days to make them stronger and stiffer and to reduce shrinkage and cracking during ambient drying. Ambient drying was achieved by first exchanging water in the gel pores for octane, followed by drying in an octane-rich atmosphere to decrease capillary forces. The synthesized nanoparticle-based silica aerogel monoliths had thicknesses up to 5 mm, diameters up to 10 cm, porosities exceeding 80%, and thermal conductivities as low as 0.08 W m

Identifiants

DOI: 10.1016/j.jcis.2021.07.159 PMID: 34454313
pubmed: 34454313
pii: S0021-9797(21)01227-3
doi: 10.1016/j.jcis.2021.07.159
pii:
doi:

Substances chimiques

Gels 0
Suspensions 0
Silicon Dioxide 7631-86-9

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

884-897

Informations de copyright

Copyright © 2021 Elsevier Inc. All rights reserved.

Déclaration de conflit d'intérêts

Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Auteurs

Michal Marszewski (M)

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Sophia C King (SC)

Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Tiphaine Galy (T)

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Glareh N Kashanchi (GN)

Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Ali Dashti (A)

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Yan Yan (Y)

Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Man Li (M)

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Danielle M Butts (DM)

Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Patricia E McNeil (PE)

Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Esther Lan (E)

Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Bruce Dunn (B)

Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA; California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Yongjie Hu (Y)

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Sarah H Tolbert (SH)

Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA 90095, USA; Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA; California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Laurent Pilon (L)

Mechanical and Aerospace Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA; California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA; Institute of the Environment and Sustainability, University of California, Los Angeles, Los Angeles, CA 90095, USA. Electronic address: pilon@seas.ucla.edu.

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Classifications MeSH

questionsmedicales.fr › Préparations pharmaceutiques › Colloïdes › Gels › Transparent silica aerogel slabs synthesized...
questionsmedicales.fr › Technologie, industrie et agriculture › Produits manufacturés › Nanostructures › Nanoparticules › Transparent silica aerogel slabs synthesized...
questionsmedicales.fr › Produits chimiques inorganiques › Composés du silicium › Silice › Transparent silica aerogel slabs synthesized...
questionsmedicales.fr › Préparations pharmaceutiques › Colloïdes › Suspensions › Transparent silica aerogel slabs synthesized...
questionsmedicales.fr › Phénomènes physiques › Thermodynamique › Conductivité thermique › Transparent silica aerogel slabs synthesized...