The DOI matches its Crossref record; 6 of the 6 references it cites were found in a registry or an index.
Cross-linking Amine-Modified Silica Aerogels with Epoxies: Mechanically Strong Lightweight Porous Materials
Abstract
The mesoporous surfaces of TMOS-derived silica aerogels have been modified with amines by copolymerization of TMOS with APTES. The amine sites have become anchors for cross-linking the nanoparticles of the skeletal backbone of the aerogel by attachment of di-, tri-, and tetra-functional epoxies. The resulting conformal coatings increase the density of the native aerogels by a factor of 2−3 but the strength of the resulting materials may increase by more than 2 orders of magnitude. Processing variables such as the amount of APTES used to make the gels, the epoxy type and concentration used for cross-linking, and the cross-linking temperature and time were varied according to a multivariable design-of-experiments (DOE) model. It was found that while elastic modulus follows a similar trend with density, maximum strength is attained neither at the maximum density nor at the highest concentration of −NH 2 groups, suggesting surface saturation effects. Aerogels cross-linked with the trifunctional epoxide always show improved strength compared with aerogels cross-linked with the other two epoxides under identical conditions. Solid 13 C NMR studies show residual unreacted epoxides, which condense with one another by heating cross-linked aerogels at 150 °C.
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Cites
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Self-citationA Special Material or a New State of Matter: A Review and Reconsideration of the Aerogel
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New Transparent Methylsilsesquioxane Aerogels and Xerogels with Improved Mechanical Properties
Kanamori, K., Aizawa, M., Nakanishi, K., & Hanada, T. (2007) · Advanced Materials · doi:10.1002/adma.200602457 · Cited by 447
Synthesis and biomedical applications of aerogels: Possibilities and challenges
Maleki, H., Durães, L., García-González, C. A., del Gaudio, P., Portugal, A., & Mahmoudi, M. (2016) · Advances in Colloid and Interface Science · doi:10.1016/j.cis.2016.05.011 · Cited by 386
Metadata
- Authors
- Meador, M. A. B., Fabrizio, E. F., Ilhan, F., Dass, A., Zhang, G., Vassilaras, P., Johnston, J. C., & Leventis, N.
- Venue
- Chemistry of Materials
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-02-11
- Volume
- 17
- Issue
- 5
- Pages
- 1085-1098
- ISSN
- 0897-4756 (ISSN-L)
- 1520-5002
- OpenAlex
- W2023387304
- Cited by
- 366
- References
- 6
- FWCI
- 4.92
- Type
- journal article
- Language
- en
- Open access
- closed
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- Meador, M. A. B., Fabrizio, E. F., Ilhan, F., Dass, A., Zhang, G., Vassilaras, P., Johnston, J. C., & Leventis, N. (2005). Cross-linking Amine-Modified Silica Aerogels with Epoxies: Mechanically Strong Lightweight Porous Materials. Chemistry of Materials. https://doi.org/10.1021/cm048063u
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Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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