Authors
Ka Yee C Lee, Ajaykumar Gopal, Anja Von Nahmen, Joseph A Zasadzinski, Jaroslaw Majewski, Gregory S Smith, Paul B Howes, Kristian Kjaer
Publication date
2002/1/8
Journal
The Journal of chemical physics
Volume
116
Issue
2
Pages
774-783
Publisher
American Institute of Physics
Description
Palmitic acid (PA) and 1-hexadecanol (HD) strongly affect the phase transition temperature and molecular packing of dipalmitoylphosphatidylcholine (DPPC) monolayers at the air–water interface. The phase behavior and morphology of mixed DPPC/PA as well as DPPC/HD monolayers were determined by pressure-area-isotherms and fluorescence microscopy. The molecular organization was probed by synchrotron grazing incidence x-ray diffraction using a liquid surface diffractometer. Addition of PA or HD to DPPC monolayers increases the temperature of the liquid-expanded to condensed phase transition. X-ray diffraction shows that DPPC forms mixed crystals both with PA and HD over a wide range of mixing ratios. At a surface pressure (π) of 40 mN/m, increasing the amount of the single chain surfactant leads to a reduction in tilt angle of the aliphatic chains from nearly 30° for pure DPPC to almost 0° in a 1:1 …
Total citations
Scholar articles
KYC Lee, A Gopal, A Von Nahmen, JA Zasadzinski… - The Journal of chemical physics, 2002
KYC Lee, J Majewski, A von Nahmen, A Gopal… - Biophysical Journal, 2000