Properties of two-component Langmuir monolayer of single chain perfluorinated carboxylic acids with dipalmitoylphosphatidylcholine (DPPC)

Interfacial Properties in Langmuir Monolayers and LB Films of DPPC with Partially Fluorinated Alcohol (F8H7OH)

“…For 0 ≤ X F8H7OH ≤ 0.5, the magnitude of the jump decreases and becomes unclear in terms of appearance and value with increases in X F8H7OH . The DV-A isotherms for the system shift from positive to negative values as X F8H7OH increases; this result is consistent with the behavior of other hydrocarbon-fluorocarbon systems 18,21,27 .…”

“…The transition pressure, π eq , that is, the pressure at which the monolayer phases begin to shift from disordered to ordered states remains largely unchanged when 0 ≤ X F8H7OH ≤ 0.3 but decreases when X F8H7OH 0.3. As such, at low surface pressures, the DPPC and F8H7OH monolayers are miscible for 0 ≤ X F8H7OH ≤ 0.3 and solidify for X F8H7OH 0.3 18,20 . Furthermore, the collapse pressure, π c , apparently changes with X F8H7OH , implying that the two components are miscible in the monolayer state.…”

“…A positive variation was observed in the case of the DPPC monolayer with respect to A, while a negative variation was seen in the case of the F8H7OH monolayer. The nature of DV positive or negative upon monolayer compression has been studied previously 18,20,21 . The magnitude of DV increases upon lateral compression as the hydrophobic moieties of the monolayer-forming amphiphilic molecules are oriented towards air and the hydrophilic groups are positioned within the subphase.…”

New Adsorption Model —Theory, Phenomena and New Concept—

“…The value of the surface potential has a high possibility of yielding a measure of the special distribution of ionic charges about this air/solution interface 13,14 . Unfortunately, there are few papers on the surface potential of soluble surfactant solutions 5,15 , as far as the authors know.…”

Interfacial Behavior of Pulmonary Surfactant Preparations Containing Egg Yolk Lecithin

“…Fluorescent micrographs were recorded with a video camera 757 JAI ICCD camera, Copenhagen, Denmark connected to the microscope directly into computer memory via an on-line image processor VAIO PCV-R53 Sony, Video Capture Soft . The entire optical setup was placed on an active vibration-isolation unit model-AY-1812, Visolator, Meiritz Seiki Co. Ltd., Yokohama, Japan 29,34 . However, the shapes of the π-A isotherms for X Hel 13-5 ≤ 0.1 were significantly affected by the addition of Hel 13-5.…”