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Issue 12, 2019
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Stability and behaviour in aqueous solutions of the anionic cubic silsesquioxane substituted with tetramethylammonium

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Abstract

The aqueous behaviour of the anionic octa-tetramethylammonium substituted cubic silsesquioxane, [N(CH3)4]8[Si8O20], was studied with quantitative 29Si-NMR. This molecule partially fragments in aqueous solutions, forming several smaller entities. The most abundant silica species are the monomer, dimer, cyclic trimer, cyclic tetramer and double three-ring. Higher concentrations are required in order to prevent complete fragmentation of the cubic structure. Additives such as alcohols and tetraalkylammonium salts have a stabilising effect on the cubic silsesquioxane, unlike sodium salts that destabilise it. A high concentration solution, containing the non-fragmented molecule as well as entities resulting from fragmentations, was investigated with neutron scattering coupled with modelling, using empirical potential structure refinement (EPSR). The modelling reveals that TMA+ ions coordinates to all different silica species, with approximately three TMA+ per cube. These are located at the faces of the cube.

Graphical abstract: Stability and behaviour in aqueous solutions of the anionic cubic silsesquioxane substituted with tetramethylammonium

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Publication details

The article was received on 07 Sep 2018, accepted on 02 Mar 2019 and first published on 04 Mar 2019


Article type: Paper
DOI: 10.1039/C8CP05682J
Phys. Chem. Chem. Phys., 2019,21, 6732-6742
  • Open access: Creative Commons BY-NC license
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    Stability and behaviour in aqueous solutions of the anionic cubic silsesquioxane substituted with tetramethylammonium

    E. J. Nilsson, M. Huber, G. Carlström, O. Söderman, D. T. Bowron, K. J. Edler and V. Alfredsson, Phys. Chem. Chem. Phys., 2019, 21, 6732
    DOI: 10.1039/C8CP05682J

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