Tuning the morphology of functionalized silica using amphiphilic organosilanes
The co-condensation of tetraethoxysilane and an amphiphilic organosilane precursor containing an ammonium part is investigated in presence of different counter-ions. We highlight the morphological versatility offered by such “one pot” synthesis, resulting of the combinatory effects of the addition of tetraethoxysilane and of the nature of the counter-ion involved in the sol-gel process. Indeed, the interactions at the interface governed by the ammonium species affect the shape of the aggregates, making of the counter-ion a critical morphological parameter. The morphology of the particles is also closely linked to the homogeneity of the system. Thereby, using the immiscibility of the tetraethoxysilane/water mixture, we showed that it is possible to get macroporous, blackberry-like or cerasome materials. Oppositely, the use of tetrahydrofuran able to solubilize all the systems leads to monodisperse nanoparticles whose size can be modulated as a function of the involved counter ion.
KeywordsOrganosilane Sol-gel Nanostructures Morphologies
The authors acknowledge J. Ravaux for assistance on SEM and Wet-STEM experiments, C. Rey and A. Jonchère for their technical support.
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Conflict of interest
The authors declare that they have no conflict of interests.
- 18.Voss R, Thomas A, Antonietti M, Ozin G (2005) A synthesis and characterization of highly amine functionalized mesoporous organosilicas by an “‘all-in-one’” approach. J Mater Chem 4010−4014.Google Scholar
- 25.Pichon BP, Wong Chi Man M, Bied C, Moreau JJE (2005) A simple access to ω-aminoalkyltrialkoxysilanes: tunable linkers for self-organised organosilicas. J Organomet Chem. 1126–1130.Google Scholar
- 34.Corriu RJP, Nguyên T (2008) Chimie Moléculaire, Sol-Gel et Nanomateriaux, Les Editions de l’Ecole Polytechnique, ParisGoogle Scholar