Probing the alkyl chain length effects on molecular packing characteristics of mixed ion pair amphiphile/double-chained cationic surfactant vesicular bilayers with the Langmuir monolayer approach

Elucidating the Effects of Cholesterol on the Molecular Packing of Double-chained Cationic Lipid Langmuir Monolayers by Infrared Reflection-absorption Spectroscopy

“…For a cholesterol Langmuir monolayer, no plateaus was detected in the π-A isotherm and an abrupt rise of surface pressure with decreased interface area was observed at 38 Å 2 /molecule, demonstrating the typical characteristic of a condensed monolayer. The π-A isotherms for pure DXDAB and cholesterol Langmuir monolayers are in agreement with those obtained in the literature 8,30,31 .…”

“…It has been reported that the RA intensity is in a linear relationship with the molecular surface density under the similar molecular orientation or conformation 39,46,47 . The relationship is reasonably described by 31 .…”

“…The diagram of RA intensity-surface density obtained for a hexadecyltrimethylammonium-dodecylsulfate HTMA- DS monolayer in a previous study 31 was chosen as the calibration curve. The linear relationship of RA value versus molecular surface density was demonstrated when the ν a -CH 2 wavenumbers were near or larger than 2924 cm 1 .…”

Bulky side chain effect of poly(N‐vinylcarbazole)‐based stacked polymer electrets on device performance parameters of transistor memories

“…Emission spectrum of P1 was basically the same in DCM solution and thin film with emission maximum at about 384 nm. This result revealed that the π‐stacking of carbazole groups in P1 was blocked by the inter‐chain interactions of hindrance groups . The emission spectra results suggested that the π‐stacked units in P1 film were fewer than those of PVK film due to the introduced hindrance groups.…”