Micromanipulation of Langmuir-Monolayers with Optical Tweezers
A technique for the manipulation of Langmuir-monolayers at the air/water interface is presented. Optical tweezers are combined with fluorescence and Brewster angle microscopy to produce a system capable of mechanical and thermal handling of monolayers on a micrometer scale. The viscoelastic, electri...
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Veröffentlicht in: | The journal of physical chemistry. B 2001-01, Vol.105 (1), p.182-187 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A technique for the manipulation of Langmuir-monolayers at the air/water interface is presented. Optical tweezers are combined with fluorescence and Brewster angle microscopy to produce a system capable of mechanical and thermal handling of monolayers on a micrometer scale. The viscoelastic, electrical, and thermodynamic properties of the monolayer can be determined by analysis of the perturbations of its structure. A method for force and heat calibration of the tweezers is given. Both kinds of micromanipulations are applied to the star shaped condensed domains in liquid expanded surroundings of bis[8-(1,2-dipalmitoyl-sn-glycero-3-phosphoryl)-3,6-dioxaoctyl]disulfide (“thiolipid”) monolayers. The stability of the stars and the consequence of their interlocking on the interfacial flow are investigated. |
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ISSN: | 1520-6106 1520-5207 |
DOI: | 10.1021/jp0024266 |