Semifluorinated chains in 2D-(perfluorododecyl)-alkanes at the air/water interface

Langmuir monolayers of a homologous series of perfluorododecyl- n-alkanes (general formula F(CF 2) 12(CH 2) n H, abbreviated as F12H n, where n = 6 – 20 ) are investigated through isotherms of surface pressure ( π) and electric surface potential (Δ V) versus area ( A) and quantitative Brewster angle...

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Veröffentlicht in:Journal of colloid and interface science 2004-11, Vol.279 (2), p.552-558
Hauptverfasser: Broniatowski, M., Miñones, J., Dynarowicz-Łątka, P.
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container_title Journal of colloid and interface science
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creator Broniatowski, M.
Miñones, J.
Dynarowicz-Łątka, P.
description Langmuir monolayers of a homologous series of perfluorododecyl- n-alkanes (general formula F(CF 2) 12(CH 2) n H, abbreviated as F12H n, where n = 6 – 20 ) are investigated through isotherms of surface pressure ( π) and electric surface potential (Δ V) versus area ( A) and quantitative Brewster angle microscopy. The investigated monolayers are found to be liquid in nature. The negative sign of the measured surface potential evidences the orientation of all the investigated molecules with their perfluorinated parts directed toward the air regardless of the length of the hydrogenated unit. Analysis of the direction of the molecular dipole moment with respect to the main axis indicates that the minimum effective dipole moment is achieved for a molecule oriented at an angle of about 35° to the surface normal. The film thickness was evaluated from the relative intensity measurements. The results suggest that the F12H n molecules are tilted to the interface in the vicinity of collapse, which is in accordance with the liquid character of their monolayers.
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The investigated monolayers are found to be liquid in nature. The negative sign of the measured surface potential evidences the orientation of all the investigated molecules with their perfluorinated parts directed toward the air regardless of the length of the hydrogenated unit. Analysis of the direction of the molecular dipole moment with respect to the main axis indicates that the minimum effective dipole moment is achieved for a molecule oriented at an angle of about 35° to the surface normal. The film thickness was evaluated from the relative intensity measurements. 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subjects Air
Air/water interface
Alkanes - chemistry
Brewster angle microscopy
Chemistry
Effective dipole moments
Exact sciences and technology
Fluorocarbons - chemistry
General and physical chemistry
Langmuir monolayers
Phase Transition
Semifluorinated alkanes
Surface potentials
Surface Properties
Surface Tension
Surface-Active Agents - chemistry
Water - chemistry
title Semifluorinated chains in 2D-(perfluorododecyl)-alkanes at the air/water interface
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