Solvent mediated assembly of nanoparticles confined in mesoporous alumina

被引：17

作者：

Alvine, KJ ^{[1
]}

Pontoni, D

Shpyrko, OG

Pershan, PS

Cookson, DJ

Shin, K

Russell, TP

Brunnbauer, M

Stellacci, F

Gang, O

机构：

[1] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA

[2] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA

[3] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[4] Argonne Natl Lab, Australian Synchrotron Res Program, Argonne, IL 60439 USA

[5] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA

[6] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[7] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 12期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.73.125412

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The controlled self-assembly of thiol stabilized gold nanocrystals in a mediating solvent and confined within mesoporous alumina was probed in situ with small angle x-ray scattering. The evolution of the self-assembly process was controlled reversibly via regulated changes in the amount of solvent condensed from an undersaturated vapor. Analysis indicated that the nanoparticles self-assembled into cylindrical monolayers within the porous template. Nanoparticle nearest-neighbor separation within the monolayer increased and the ordering decreased with the controlled addition of solvent. The process was reversible with the removal of solvent. Isotropic clusters of nanoparticles were also observed to form temporarily during desorption of the liquid solvent and disappeared upon complete removal of liquid. Measurements of the absorption and desorption of the solvent showed strong hysteresis upon thermal cycling. In addition, the capillary filling transition for the solvent in the nanoparticle-doped pores was shifted to larger chemical potential, relative to the liquid/vapor coexistence, by a factor of 4 as compared to the expected value for the same system without nanoparticles.

引用

页数：9

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