Temperature-dependent aggregation behavior of symmetric long-chain bolaamphiphiles at the air-water interface

Langmuir : the ACS Journal of Surfaces and Colloids
Karen KöhlerAlfred Blume

Abstract

The behavior of the symmetric long-chain bolaamphiphiles dotriacontane-1,32-diyl bis[2-(trimethylammonio)ethyl phosphate] (PC-C32-PC), and dotriacontane-1,32-diyl bis[2-(dimethylammonio)ethyl phosphate] (Me(2)PE-C32-Me(2)PE) at the air-water interface was investigated by means of temperature-dependent film-balance measurements and Brewster angle microscopy. Upon compression of the monolayer the isotherms show a strong surface pressure increase. We assume that at high pressure the monolayer consists of molecules in a reversed U-shaped conformation. At an area of 0.9-1.1 nm(2) per molecule a plateau is reached for both bolaamphiphiles, which marks the beginning of an aggregate formation on the water surface. The plateau pressure increases with increasing temperature. For PC-C32-PC at 6.7 degrees C curved shorter fibrous domains with a diameter of 20-30 mum are seen on the water surface, whereas at 29.2 degrees C stripelike domains with a thickness of 200-500 mum are observed. Isotherms recorded within this temperature range show a characteristic break within the steep slope marking a region where a mixture or a hybrid form of both structures exists. Me(2)PE-C32-Me(2)PE in its zwitterionic state at low pH forms microcrystals on th...Continue Reading

Citations

Jan 12, 2010·Chemistry and Physics of Lipids·Parkson Lee-Gau Chong
Feb 11, 2014·Advances in Colloid and Interface Science·Alfred BlumeAnnette Meister
Jun 2, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Toshimi ShimizuMitsutoshi Masuda
Jul 30, 2010·Chemical Reviews·George R Newkome, Carol Shreiner
Apr 24, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Annette MeisterAlfred Blume

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