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Article Dans Une Revue Journal of Materials Chemistry Année : 2011

Modification of silica by an organic monolayer in aqueous medium using octylphosphonic acid and aluminium species

Résumé

In the present work we report a "green" method for the grafting of organic monolayers at the surface of silica nanoparticles using water as a solvent. This method is based on the use of water-stable phosphonic acid coupling molecules grafted on an intermediate layer of aluminium species, as the sensitivity of Si-O-P bonds toward hydrolysis precludes a direct anchoring onto silica. Two approaches were explored: anchoring of octylphosphonic acid on aluminated silica and one-pot modification of silica by AlCl3 then by octylphosphonic acid. The modified powders were characterized using elemental analysis, P-31 and Al-27 MAS NMR spectroscopy, FTIR spectroscopy and N-2 physisorption. The one-pot approach appears particularly promising, as it allows the anchoring on silica of phosphonic acid monolayers with controlled densities in a significantly shorter time.

Domaines

Matériaux
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Dates et versions

hal-00602570 , version 1 (22-06-2011)

Identifiants

Citer

Stephanie Lassiaz, Dominique Labarre, Anne Galarneau, Daniel Brunel, P. Hubert Mutin. Modification of silica by an organic monolayer in aqueous medium using octylphosphonic acid and aluminium species. Journal of Materials Chemistry, 2011, 21 (22), pp.8199-8205. ⟨10.1039/c1jm10128e⟩. ⟨hal-00602570⟩
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