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Continuous Phase Transitions and Orientational Ordering in Monolayers of Zwitterionic Amphiphilic Molecules at Fluid Interfaces
Author(s) -
Katbamna P.,
Dunne L. J.,
Ford W.,
Lavis D. A.,
Southern B. W.
Publication year - 1993
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221780210
Subject(s) - monolayer , amphiphile , phase transition , chemical physics , amphiphilic molecule , phospholipid , phase (matter) , molecule , polar , complex fluid , chemistry , materials science , crystallography , organic chemistry , nanotechnology , thermodynamics , physics , membrane , biochemistry , astronomy , copolymer , polymer
Experimental and theoretical evidence is presented which shows that orientational ordering of highly polar head groups in monolayers of amphiphilic molecules (zwitterionic 2 amino‐tetradecanoic acid) at fluid interfaces produces a smooth continuous phase transition. Hence this supports the view that models which interpret the sharp ‘kink’ point phase transitions exhibited by phospholipid monolayers at oil/water interfaces as being purely due to reorientation are deficient in important respects and suggests that the model which is most likely to be applicable to lipids of biological interest at oil/water interfaces is a blend of chain melting and collective molecular orientational ordering.