Synthesis of stable, gold-particle-containing onion-type multilamellar vesicles. Influence of particle size on the onions' internal - Centre de recherches Paul Pascal Accéder directement au contenu
Article Dans Une Revue Nanotechnology Année : 2006

Synthesis of stable, gold-particle-containing onion-type multilamellar vesicles. Influence of particle size on the onions' internal

Résumé

In a previous paper, we reported that large gold particles (about 100 nm) could be synthesized in onion-type multilamellar vesicles, but with consecutive onion destruction (Regev et al 2004 Chem. Mater. 16 5280). Here, we modified the experimental synthesis process to produce stable phosphatidylcholine- (PC-) based onions containing 3–10 nm size gold particles. Direct hydration of the sheared lamellar phase with a 10−2 M KAuCl4 solution was used. Insertion of octadecylamine into PC–monoolein onion bilayers results in a decrease of gold particle size from 45 nm down to 5 nm. A reduction process is proposed, which notably enlightens gold formation kinetics. Monoolein is shown to act as the chemical reductant by FT-IR analysis, while a photon-induced reduction is assumed for bilayers depleted in monoolein. The effect of gold particles on lamellar arrangement is tackled by small angle x-ray diffraction experiments, while the stability of particle-containing onion-type multilamellar vesicles is discussed using cryo-TEM imaging.

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Domaines

Biotechnologies

Dates et versions

hal-00093125 , version 1 (12-09-2006)

Identifiants

Citer

Marie-Edith Meyre, Olivier Lambert, Bernard Desbat, Chrystel Faure. Synthesis of stable, gold-particle-containing onion-type multilamellar vesicles. Influence of particle size on the onions' internal. Nanotechnology, 2006, 17, p. 1193-1201. ⟨10.1088/0957-4484/17/5/005⟩. ⟨hal-00093125⟩

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