Logo image
Back
Behavior of 10-(perfluorohexyl)-decanol, a partially fluorinated analog of hexadecanol, at the air–water interface
Journal article   Peer reviewed

Behavior of 10-(perfluorohexyl)-decanol, a partially fluorinated analog of hexadecanol, at the air–water interface

Hans-Joachim Lehmler and Paul M Bummer
Journal of fluorine chemistry, Vol.117(1), pp.17-22
2002
DOI: 10.1016/S0022-1139(02)00169-0

View Online

Abstract

10-(Perfluorohexyl)-decanol is a partially fluorinated analog of hexadecanol, an important detergent alcohol. With a melting point of T=48.82 °C and a melting enthalpy of Δ H=53.96 J/g, the intermolecular interactions of the fluorinated alcohol are weaker compared to hexadecanol ( T=52.67 °C, Δ H=244.41 J/g). The behavior of this fluorinated alcohol at the air–water interface was studied on five different subphases, namely, water, NaCl (150 mM), CaCl 2 (2 mM), HCl (pH=2.0), and urea (0.5 M). Similar to other partially fluorinated amphiphiles, the compression isotherms of the fluorinated alcohol on all subphases are more expanded compared to the hydrocarbon alcohol with a limiting area of 32–36 Å 2 per molecule and a temperature-dependent phase transition at 5.6–8.2 mN/m (37 °C, compression rate of 10 mm/min). The dependence of the compression isotherms of 10-(perfluorohexyl)-decanol on subphase composition and temperature follows the trends reported for tetra- and hexadecanol. In particular, a shift to smaller molecular areas with increasing temperatures was observed on all five subphases. The shift to smaller molecular areas on urea indicates that in the case of 10-(perfluorohexyl)-decanol the effect is largely due to a loss of material from the air–water interface during compression of the monolayers. However, a squeezing-out of water molecules from the hydration sphere of the polar headgroup may still occur but can not be unambiguously proven.
 DSC Fluorinated Hexadecanol Langmuir isotherms

Details

Metrics

31 Record Views
27 Times Cited - Web of Science
Logo image