An imidazolium ionic liquid as effective structure-directing agent for the fabrication of silica thin films with vertically aligned nanochannels
Artikel i vetenskaplig tidskrift, 2020

In parallel to the increasing variety of ionic liquids that show different kinds of nanometer-scale structuration in their pure and solved forms, there is a raising interest in exploring the possibility of using ionic liquids as soft-templates for the synthesis of mesoporous materials. We report the case of 1-hexadecyl-3-methylimidazolium chloride (C16MIMCl), a surface active ionic liquid (SAIL), here used as an excellent soft-template for the formation of vertically aligned, uniform mesochannels, with a well defined pore width of 2.5 nm in silica thin films deposited with the electrochemically assisted self-assembly (EASA) method. The obtained mesochannels run through the entire thickness of the films and after removal of the ionic liquid the emptied mesochannels ensure a thorough mass transport to the substrate, here monitored by the redox-active electrochemical probe Ru(II)/Ru(III) during cyclic voltammetry (CV). Moreover, the mechanism of pore formation is explained; unlike the mechanisms reported for short chain imidazolium ionic liquid silica templates, in the case of C16MIMCl the dominating so-called cooperative interaction is the electrostatic attraction between the C16MIM+ and the network-forming negatively charged silicate oligomers. Therefore, this study provides a better understanding of the templating behavior of long chain imidazolium ionic liquids and motivates further research on the synthesis of ionic liquid-based functional hybrid materials.

Surface active ionic liquids (SAILs)

Oriented nanochannels

Porous silica thin films

Författare

Szilvia Vavra

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Anna Martinelli Group

Neus Vilà

University of Lorraine

Antiope Lotsari

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Martin Andersson Group

Alain Walcarius

University of Lorraine

Anna Martinelli

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Anna Martinelli Group

Microporous and Mesoporous Materials

1387-1811 (ISSN)

Vol. In Press 110407

Ökad protonledning i protiska jonvätskor genom självorganiserad syra-baskemi

Vetenskapsrådet (VR), 2019-01-01 -- 2022-12-31.

Ämneskategorier

Oorganisk kemi

Fysikalisk kemi

Materialkemi

DOI

10.1016/j.micromeso.2020.110407

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Senast uppdaterat

2021-01-04