Detemplation of soft mesoporous silica nanoparticles with structural preservation

Lidia López Pérez, María J. Ortiz-Iniesta, Zheng Zhang, Iker Agirrezabal-Telleria, Martijn Santes, Hero Jan Heeres, Ignacio Melián-Cabrera*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

15 Citaten (Scopus)

Samenvatting

A mild protocol that allows the template removal of soft un-aged silica nanoparticles was investigated. After oxidizing the organic template by Fenton chemistry, a good structural preservation is only achieved when the material is equilibrated and dried in a low-surface tension solvent. This avoids excessive capillary stress induced by the high surface tension of water, a major component in the Fenton reaction medium. The Fenton reaction should be carried out under mild conditions as well; otherwise the sample deteriorates by extensive hydrolysis, and capillary stress, and the structural ordering diminishes severely. We propose employing 10 ppm Fe concentration at 70 °C for 24 h for the cetyltrimethylammonium bromide template. The proposed protocol involves 2 steps resulting in an overall significantly higher pore volume attributed to the wider pores and limited particle agglomeration, while the calcined counterpart evidences aggregation and loss of the hexagonal ordering. n-BuOH exchange is unnecessary when the mesophase is stabilized by ageing, as the structure resists the water capillary stress.

Originele taal-2English
Pagina's (van-tot)4747-4753
Aantal pagina's7
TijdschriftJournal of Materials Chemistry A
Volume1
Nummer van het tijdschrift15
DOI's
StatusPublished - 21-apr-2013

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