2D "Soap"-Assembly of Nanoparticles via Colloid-Induced Condensation of Mixed Langmuir Monolayers of Fatty Surfactants

被引：15

作者：

Babenko, Denis I. ^{[1
]}

Ezhov, Alexander A. ^{[2
]}

Turygin, Dmitry S. ^{[1
]}

Ivanov, Vladimir A. ^{[3
]}

Arslanov, Vladimir V. ^{[1
]}

Kalinina, Maria A. ^{[1
]}

机构：

[1] RAS, Frumkin Inst Phys Chem & Electrochem, Moscow 119991, Russia

[2] Moscow MV Lomonosov State Univ, Fac Phys Lomonosov, Moscow 119991, Russia

[3] RAS, NS Kurnakov Gen & Inorgan Chem Inst, Moscow 119991, Russia

来源：

LANGMUIR | 2012年 / 28卷 / 01期

关键词：

PATTERN-FORMATION; PARTICLE-SIZE; STEARIC-ACID; FILMS; OCTADECYLAMINE; FABRICATION; MORPHOLOGY; MECHANISM;

D O I：

10.1021/la202834n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We describe a new type of colloidal 2D gels formed in mixed Langmuir monolayers of stearic acid and octadecylamine on a surface of gold hydrosol. The adsorption of gold nanoparticles on the mixed monolayer led to an increase of interactions between oppositely charged surfactants giving a "soap" of mixed fatty salt. The observed effect is equivalent to a virtual "cooling" of floating monolayer, which undergoes rapid condensation on a surface of aqueous colloid. The consequent shrinking and rearrangement of the monolayer resulted in aggregation of nanoparticles into colloidal 2D "soap"-gels, which represented arrested colloidal phases within nonadsorbing organic medium. When sequentially deposited onto solids by Langmuir-Blodgett technique, the 2D "soap"-gels separated into organic and colloidal phases and gave dendrite-like bilateral organic crystallites coated with gold nanoparticles. The reported colloidal "soap"-assembly can offer a new opportunity to design 2D colloidal systems of widely variable chemistry and structures.

引用

页码：125 / 133

页数：9

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