Line tension in Langmuir monolayers probed by point forces

Autor:	P. Steffen, Th. M. Fischer, Z. Khattari, M. Wurlitzer, S. Wurlitzer
Rok vydání:	2000
Předmět:	Surface tension Dipole Optical tweezers Chemistry Tension (physics) Phase (matter) Monolayer Tweezers Analytical chemistry General Physics and Astronomy Physical and Theoretical Chemistry Deformation (engineering) Molecular physics
Zdroj:	The Journal of Chemical Physics. 113:3822-3828
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.1287907
Popis:	A Langmuir monolayer of methyl octadecanoate in the phase coexistence region liquid expanded/liquid condensed is observed with fluorescence microscopy and mechanically manipulated using optical tweezers. A circular liquid condensed droplet is locally fixed with the tweezers and deformed by hydrodynamic flow of the surroundings. The stationary shape is determined by the competition of the bare line tension λ, dipole and hydrodynamic forces. The dipole contributions to the shape can be accounted for by introducing an effective line tension λeff. At the front of the droplet a wedge angle θ is formed, from which λeff can be deduced. The electrostatic contribution λeff-λ is calculated for the experimental shape in the limit of weak deformations. The range of deformation where this approach holds is determined for a triangular shape.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ec91fe9616ba43f727d6c62316af0ef6 https://doi.org/10.1063/1.1287907 Zobrazit plný text záznamu