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Journal Articles ChemPhysChem Year : 2015

In Situ Small-Angle X-ray Scattering Investigation of the Formation of Dual-Mesoporous Materials

Abstract

The formation of two-dimensional (2D)-hexagonal (p6m) silica-based hybrid material with a dual-mesoporosity is investigated in situ using synchrotron time-resolved Small Angle X-ray Scattering (SAXS). The material is synthesized from a mixed micellar solution of a nonionic fluorinated surfactant, RF₈(EO)₉, and a nonionic triblock copolymer, P123. Both mesoporosities, with pores dimensions at 3.3 and 8.5 nm respectively, are seen by Nitrogen sorption, TEM and SAXS. The in situ SAXS experiments reveal a mesophase formation in two steps. First the nucleation and growth of a primary 2D-hexagonal network (N1) associated to mixed micelles containing P123, then followed by the formation of the second network (N2) associated to micelles of pure RF₈(EO)₉. The data obtained from SAXS and TEM suggest that N1 is used as nucleation centers for the formation of N2, that would result in the formation of a grain with both mesoporosities. Understanding the formation mechanism of such material is an important step towards the synthesis of more complex materials with a fine tuning of the porosity.

Dates and versions

hal-01496191 , version 1 (27-03-2017)

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Julien Schmitt, Nadia Canilho, Marianne Impéror-Clerc, Jean-Luc Blin, Jan Skov Pedersen, et al.. In Situ Small-Angle X-ray Scattering Investigation of the Formation of Dual-Mesoporous Materials. ChemPhysChem, 2015, 16 (17), pp.3637 - 3641. ⟨10.1002/cphc.201500642⟩. ⟨hal-01496191⟩
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