Spontaneous formation of silver nanoparticles in multilamellar vesicles

被引:49
作者
Faure, C [1 ]
Derré, A [1 ]
Neri, W [1 ]
机构
[1] CNRS, Ctr Rech Paul Pascal, F-33600 Pessac, France
关键词
D O I
10.1021/jp027449u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Silver nanoparticles have been synthesized using AgNO3 as the metallic source and onion-type multilamellar vesicles (MLV) as the microreactor, where the Genamin T020 organic component is acting as the reductant. Silver ions were introduced into MLV either by diffusion from the dispersion medium, or directly by mixing AgNO3 solution with Genamin T020 followed by a shear process. Both the effect of synthetic routes and aging upon the nanoparticle size and assemblies are studied by TEM. In the former case, the size of silver nanoparticles increases from ca. 3 nm to 9.6 nm with increasing dispersion time (30 min and 17 h respectively). For short dispersion times, silver nanoparticles assemble in circular aggregates. The typical size of those aggregates resembles that of MLV, thus indicating an in-situ synthesis. In the latter case, nanoparticle growth is quicker: 7-8 nm silver particles being synthesized in 30 min. Nanoparticles arrange themselves then in parallel strings separated from each other, forming planes, stacked on each other in some cases. A higher onion internal pH measured by P-31 NMR is assumed to induce Ag2O precipitation inside onions contributing to Ag(I) reduction in metallic nanoparticles.
引用
收藏
页码:4738 / 4746
页数:9
相关论文
共 30 条
[1]   Effects of intermicellar exchange rate on the formation of silver nanoparticles in reverse microemulsions of AOT [J].
Bagwe, RP ;
Khilar, KC .
LANGMUIR, 2000, 16 (03) :905-910
[2]   SIZE TAILORING OF SILVER COLLOIDS BY REDUCTION IN W/O MICROEMULSIONS [J].
BARNICKEL, P ;
WOKAUN, A ;
SAGER, W ;
EICKE, HF .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1992, 148 (01) :80-90
[3]   SYNTHESIS OF METAL COLLOIDS IN INVERSE MICROEMULSIONS [J].
BARNICKEL, P ;
WOKAUN, A .
MOLECULAR PHYSICS, 1990, 69 (01) :1-9
[4]   Electron microscopy and catalytic study of silver catalysts: Structure sensitivity of the hydrogenation of crotonaldehyde [J].
Claus, P ;
Hofmeister, H .
JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (14) :2766-2775
[5]  
DIAT O, 1993, J PHYS II, V3, P1427, DOI 10.1051/jp2:1993211
[6]   Spontaneous formation of gold nanoparticles in aqueous solution of sugar-persubstituted poly(amidoamine) dendrimers [J].
Esumi, K ;
Hosoya, T ;
Suzuki, A ;
Torigoe, K .
LANGMUIR, 2000, 16 (06) :2978-2980
[7]  
Faure C, 2001, PROG COLL POL SCI S, V118, P42
[8]   Electrochemical codeposition of multilamellar vesicles in an inorganic matrix [J].
Faure, C ;
Ravaine, S ;
Argoul, F .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2000, 147 (02) :575-579
[9]   Studying a new type of surfactant aggregate ("Spherulites") as chemical microreactors. A first example: Copper ion entrapping and particle synthesis [J].
Gauffre, F ;
Roux, D .
LANGMUIR, 1999, 15 (11) :3738-3747
[10]   Formation of colloidal silver nanoparticles: Capping action of citrate [J].
Henglein, A ;
Giersig, M .
JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (44) :9533-9539