Mesoporous Silica Formation Mechanisms Probed Using Combined Spin-Echo Modulated Small-Angle Neutron Scattering (SEMSANS) and Small-Angle Neutron Scattering (SANS)

Julien Schmitt, Jan Joost Zeeuw, Jan Joost Zeeuw, Jeroen Plomp, Wim G. Bouwman, Adam L. Washington, Chris P. Duif, Michel A. Thijs, Steven R. Parnell, More Authors

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Abstract

The initial formation stages of surfactant-templated silica thin films which grow at the air-water interface were studied using combined spin-echo modulated small-angle neutron scattering (SEMSANS) and small-angle neutron scattering (SANS). The films are formed from either a cationic surfactant or nonionic surfactant (C16EO8) in a dilute acidic solution by the addition of tetramethoxysilane. Previous work has suggested a two stage formation mechanism with mesostructured particle formation in the bulk solution driving film formation at the solution surface. From the SEMSANS data, it is possible to pinpoint accurately the time associated with the formation of large particles in solution that go on to form the film and to show their emergence is concomitant with the appearance of Bragg peaks in the SANS pattern, associated with the two-dimensional hexagonal order. The combination of SANS and SEMSANS allows a complete depiction of the steps of the synthesis that occur in the subphase.

Original languageEnglish
Pages (from-to)28461-28473
JournalACS Applied Materials and Interfaces
Volume12
Issue number25
DOIs
Publication statusPublished - 2020

Keywords

  • kinetics
  • mesophase
  • mesoporous silica
  • micelles
  • particles
  • silica films
  • small-angle neutron scattering (SANS)
  • spin-echo modulated small-angle neutron scattering (SEMSANS)

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