Monolayer Formation of Alkyl Chain-Containing Phosphoric Acid Amphiphiles at the Air/Water (pH 5.6) Interface: Influence of Temperature and Cations

Interactions of l-arginine with Langmuir monolayers of di-n-dodecyl hydrogen phosphate at the air–water interface

“…With increasing temperature, the cusp point moves to higher surface pressure and lower molecular area to overcome the additional strain of thermal motion and chain flexibility of the molecules. The amphiphile shows a limiting molecular area of ∼0.50 nm 2 /molecule, which is consistent with the value reported elsewhere [31]. Fig.…”

“…the DDP monolayer on water shows a cusp point at a critical surface pressure (π c ) of ∼6.2 mN/m and at a critical molecular area (A c ) of ∼0.64 nm 2 /molecule. After this transition, the surface pressure rises rapidly at a limiting molecular area (A s ) of ∼0.50 nm 2 /molecule showing the so called solid film region [31]. In the presence of L-arg in the subphase, all the π-A isotherms indicate almost the same limiting molecular area as shown by the DDP monolayer on water.…”

Surface phase behavior of di-n-tetradecyl hydrogen phosphate in Langmuir monolayers at the air–water interface

“…The limiting molecular area of the DTP, estimated by the linear extrapolation of the so-called solid film region in the isotherms, is about 0.50 nm 2 /molec. This value and the π c s at different temperatures are consistent with the corresponding values reported elsewhere [14]. Although the limiting molecular area of the DTP is equal to that of the DDP [15], this value is somewhat larger than a cross-sectional area of some similar double chain phospholipids such as DMPA (0.41 nm 2 /molec) or dipalmitoylphosphatidylcholine (DPPC, 0.45 nm 2 /molec) [3,4].…”

“…However, studies on the properties of the DAP monolayers have largely been ignored. So far, He et al [14] have measured surface pressurearea (π-A) isotherms of the monolayers of the DAP containing 12-(di-n-dodecyl hydrogen phosphate (DDP)), and 14-carbon (di-n-tetradecyl hydrogen phosphate (DTP)) alkyl chains. In a recent article, we have reported the morphological properties of the DDP at different temperatures [15].…”

Synthesis of one-dimensional silver oxide nanoparticle arrays and silver nanorods templated by Langmuir monolayers

“…Porphyrin derivatives TAPP, TDPP and TSPP (Chart 1) and n-HDP were synthesized according to the literature methods [45,46], respectively. Ethyl stearate (ES) was purchased from Aldrich.…”