Fermi Resonant Interaction of the Tailed Methyl Groups of Langmuir Monolayer at the Air/Water Interface during Phase Transition

2015 ◽  
Vol 119 (45) ◽  
pp. 25394-25400 ◽  
Author(s):  
Kangzhen Tian ◽  
Shuji Ye
Keyword(s):  
Phase Transition ◽  
Resonant Interaction ◽  
Langmuir Monolayer ◽  
Methyl Groups ◽  
Water Interface ◽  
Air Water Interface

Temperature dependence of dipalmitoyl phosphatidylcholine monolayer stability

1981 ◽  
Vol 51 (5) ◽  
pp. 1108-1114 ◽  
Author(s):  
J. Goerke ◽  
J. Gonzales
Keyword(s):  
Phase Transition ◽  
Lung Surfactant ◽  
Principal Component ◽  
Water Interface ◽  
Dipalmitoyl Phosphatidylcholine ◽  
Phase Transition Temperatures ◽  
Air Water Interface ◽  
Different Temperatures ◽  
Monolayer Stability ◽  
Isolated Rat

Dipalmitoyl phosphatidylcholine is the principal component of lung surfactant, and knowledge of its behavior as a film spread at the air-water interface is essential for understanding how lung surfactant itself works. We therefore studied the collapse rates of very low surface tension air-water monolayers of dipalmitoyl, dimyristoyl, and palmitoyl-myristoyl phosphatidylcholines at different temperatures. In each case we found that the monolayers abruptly became unstable at temperature 3–4 degree C above their bulk lipid-water phase transition temperatures (Tc). This accords with a comparable increase in Tc occurring in bulk systems subjected to high pressure. These findings are also consistent with the behavior of isolated rat lungs, which have been found to require higher transmural pressures to maintain a given volume on deflation when kept at temperature above the Tc of dipalmitoyl phosphatidylcholine.

Phase transition in adsorbed monolayers of 2-hydroxyethyl laurate at the air-water interface

2000 ◽  
Vol 171 (1-3) ◽  
pp. 105-113 ◽  
Author(s):  
Md.Mufazzal Hossain ◽  
Masaaki Yoshida ◽  
Ken-ichi Iimura ◽  
Noboru Suzuki ◽  
Teiji Kato
Keyword(s):  
Phase Transition ◽  
Water Interface ◽  
Air Water Interface

Effect of Chain Microstructure and Subphase pH on the Surface Properties and Aggregation Behavior of Amphiphilic Copolymers Based on Fluoroacrylates

2019 ◽  
Vol 816 ◽  
pp. 312-317
Author(s):  
Alexandra O. Grigoreva ◽  
E.Y. Polozov ◽  
S.D. Zaitsev
Keyword(s):  
Acrylic Acid ◽  
Surface Properties ◽  
Butyl Acrylate ◽  
Langmuir Monolayer ◽  
Aggregation Behavior ◽  
Reactivity Ratios ◽  
Water Interface ◽  
Amphiphilic Copolymers ◽  
Air Water Interface ◽  
Raft Agent

Copolymerization of 2,2,3,3,4,4,5,5-octafluoropentyl acrylate (OFPA) and acrylic acid (AA), OFPA and tert-butyl acrylate (t-BA) in presence ofdibenzylcarbonotrithioate (BTC) and polymeric RAFT-agents was studied, reactivity ratios were calculated. It was shown that type of RAFT-agent can influence on chain microstructure of obtained polymers. Aggregation behavior of obtained amphiphilic copolymers with different microstructures at the air/water interface was characterized by the Langmuir monolayer technique. The effect of the microstructureand subphase pH on the isotherm curves were shown.

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