Structure and Composition of the Mixed Monolayer of Hexadecyltrimethylammonium Bromide and Benzyl Alcohol Adsorbed at the Air/Water Interface

Langmuir ◽  
1998 ◽  
Vol 14 (8) ◽  
pp. 2139-2144 ◽  
Author(s):  
J. Penfold ◽  
E. Staples ◽  
I. Tucker ◽  
L. Soubiran ◽  
A. Khan Lodi ◽  
...  
Keyword(s):  
Benzyl Alcohol ◽  
Hexadecyltrimethylammonium Bromide ◽  
Water Interface ◽  
Mixed Monolayer ◽  
Air Water Interface

scholarly journals Nucleation of Surfactant–Alkane Mixed Solid Monolayer and Bilayer Domains at the Air–Water Interface

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 485
Author(s):  
Hiroki Matsubara ◽  
Rikako Mori ◽  
Eisuke Ohtomi
Keyword(s):  
Line Tension ◽  
Hexadecyltrimethylammonium Bromide ◽  
Water Interface ◽  
Brewster Angle Microscopy ◽  
Tetradecyltrimethylammonium Bromide ◽  
Mixed Monolayer ◽  
Dipole Interactions ◽  
Thermal Phase Transition ◽  
Air Water Interface ◽  
The Difference

We investigated the wetting transitions of tetradecane and hexadecane droplets in dodecyltrimethylammonium bromide (C12TAB), tetradecyltrimethylammonium bromide (C14TAB), and hexadecyltrimethylammonium bromide (C16TAB) aqueous solutions. By varying the surfactant concentration, the formation of mixed monolayers of a surfactant and an alkane was observed at the air–water interface. Depending on the combination of surfactant and alkane, these wetting monolayers underwent another thermal phase transition upon cooling either to a frozen mixed monolayer (S1) or a bilayer structure composed of a solid monolayer of a pure alkane rested on a liquid-like mixed monolayer (S2). Based on the phase diagrams determined by phase modulation ellipsometry, the difference in the morphology of the nucleated S1 and S2 phase domains was also investigated using Brewster angle microscopy. Domains of the S1 phase were relatively small and highly branched, whereas those of the S2 phase were large and circular. The difference in domain morphology was explained by the competition of the domain line tension and electrostatic dipole interactions between surfactant molecules in the domains.

scholarly journals Reversible Trilayer Formation at the Air−Water Interface from a Mixed Monolayer Containing a Cationic Lipid and an Anionic Porphyrin

2004 ◽  
Vol 108 (14) ◽  
pp. 4457-4465 ◽  
Author(s):  
Marta Pérez-Morales ◽  
José M. Pedrosa ◽  
María T. Martín-Romero ◽  
Dietmar Möbius ◽  
Luis Camacho
Keyword(s):  
Cationic Lipid ◽  
Water Interface ◽  
Mixed Monolayer ◽  
Air Water Interface

scholarly journals MONOLAYER CHARACTERISTICS OF PYRENE MIXED WITH STEARIC ACID AT THE AIR–WATER INTERFACE

2008 ◽  
Vol 15 (03) ◽  
pp. 287-293 ◽  
Author(s):  
MD. N. ISLAM ◽  
D. BHATTACHARJEE ◽  
SYED ARSHAD HUSSAIN
Keyword(s):  
Phase Separation ◽  
Stearic Acid ◽  
Surface Pressure ◽  
Water Interface ◽  
Present Communication ◽  
Mixed Monolayer ◽  
Air Water Interface ◽  
Mixed Films ◽  
Pressure Area

In the present communication, the monolayer characteristics of pyrene mixed with stearic acid (SA) at the air–water interface have been reported. The monolayer properties are investigated by recording and analyzing the surface pressure–area per molecule isotherm (π–A) of the pyrene–SA mixed films. It is observed that the pyrene and SA are miscible in the mixed monolayer. This miscibility/nonideality leads to phase separation between the constituent components (pyrene and SA). BAM image of the mixed monolayer confirms the miscibility or nonideal mixing at the mixed monolayer.

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