Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/134878
Title: | Metal oxide aerogels with controlled crystallinity and faceting from the epoxide-driven cross-linking of colloidal nanocrystals |
Author: | Berestok, Taisiia Guardia, Pablo Du, Ruifeng Blanco Portals, Javier Colombo, Massimo Estradé Albiol, Sònia Peiró Martínez, Francisca Brock, Stephanie L. Cabot i Codina, Andreu |
Keywords: | Nanocristalls Lligands Nanopartícules Nanocrystals Ligands Nanoparticles |
Issue Date: | 19-Apr-2018 |
Publisher: | American Chemical Society |
Abstract: | We present a novel method to produce crystalline oxide aerogels which is based on the cross linking of preformed colloidal nanocrystals (NCs) triggered by propylene oxide (PO). Ceria and titania were used to illustrate this new approach. Ceria and titania colloidal NCs with tuned geometry and crystal facets were produced in solution from the decomposition of a suitable salt in the presence of oleylamine (OAm). The native surface ligands were replaced by amino acids, rendering the NCs colloidally stable in polar solvents. The NC colloidal solution was then gelled by adding PO, which gradually stripped the ligands from the NC surface, triggering a slow NC aggregation. NC-based metal oxide aerogels displayed both high surface areas and excellent crystallinity associated with the crystalline nature of the constituent building blocks, even without any annealing step. Such NC-based metal oxide aerogels showed higher thermal stability compared with aerogels directly produced from ionic precursors using conventional sol-gel chemistry strategies. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1021/acsami.8b03754 |
It is part of: | ACS Applied Materials & Interfaces, 2018, vol. 10, num. 18, p. 16041-16048 |
URI: | http://hdl.handle.net/2445/134878 |
Related resource: | https://doi.org/10.1021/acsami.8b03754 |
ISSN: | 1944-8244 |
Appears in Collections: | Articles publicats en revistes (Enginyeria Electrònica i Biomèdica) |
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680838.pdf | 3.06 MB | Adobe PDF | View/Open |
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