Tracking Giant Folds in a Monolayer

被引：6

作者：

Boatwright, Thomas ^{[1
]}

Levine, Alex J. ^{[2
,3
]}

Dennin, Michael ^{[1
]}

机构：

[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[2] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA

[3] Univ Calif Los Angeles, Calif Nanosyst Inst, Los Angeles, CA 90095 USA

来源：

LANGMUIR | 2010年 / 26卷 / 15期

关键词：

PULMONARY SURFACTANT; COLLAPSE; STRESS;

D O I：

10.1021/la1012439

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The collapse dynamics of giant folds in a catanionic monolayer at the air-water interface are examined. A monolayer of dioctadecyldimethylammonium bromide (DODAB) and sodium dodecyl sulfate (SDS) in a 1:1 ratio is the system of study that previously was found to fold upon compression in a Langmuir trough. Carboxylate-coated polystyrene beads (1 mu m diameter) are deposited and bound to the monolayer. Displacement of the beads is measured with epifluorescence microscopy and particle image velocimetry, yielding a measurement of the velocity of the monolayer around the fold. Reversibility is confirmed by measuring the amount of monolayer material entering and leaving the fold. Material near folds are found to have a maximum relative velocity on the order of 0.1 mm/s, and fold depths are found to be on the order of 1 mm. The folds exhibit regular unfolding behavior, which can be explained qualitatively by a simple mechanical model.

引用

页码：12755 / 12760

页数：6

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