Hydrolytic Behavior of Enantiomeric Poly(lactide) Mixed Monolayer Films at the Air/Water Interface:  Stereocomplexation Effects

Langmuir ◽  
2005 ◽  
Vol 21 (24) ◽  
pp. 11180-11184 ◽  
Author(s):  
Won-Ki Lee ◽  
Tadahisa Iwata ◽  
Joseph A. Gardella
Keyword(s):  
Water Interface ◽  
Monolayer Films ◽  
Mixed Monolayer ◽  
Air Water Interface

Metastability in Monolayer Films Transferred onto Solid Substrates by the Langmuir-Blodgett Method: IR Evidence for Transfer-Induced Phase Transitions

1994 ◽  
Vol 48 (10) ◽  
pp. 1196-1203 ◽  
Author(s):  
Fazale R. Rana ◽  
Suci Widayati ◽  
Brian W. Gregory ◽  
Richard A. Dluhy
Keyword(s):  
Fatty Acid ◽  
Conformational Changes ◽  
Structural Changes ◽  
High Surface ◽  
Solid Substrate ◽  
Water Interface ◽  
Monolayer Films ◽  
Langmuir Blodgett ◽  
Monomolecular Film ◽  
Air Water Interface

The rate at which a monomolecular film is deposited onto a solid substrate in the Langmuir-Blodgett process of preparing supported monolayer films influences the final structure of the transferred film. Attenuated total reflectance infrared spectroscopic studies of monolayers transferred to germanium substrates show that the speed at which the substrate is drawn through the air/water interface influences the final conformation in the hydrocarbon chains of amphiphilic film molecules. This transfer-induced effect is especially evident when the monolayer is transferred from the expanded region of surface-pressure-molecular-area isotherms at low surface pressures; the effect is minimized when the film molecules are transferred from condensed phases at high surface pressures. This phenomenon has been observed for both a fatty acid and a phospholipid, which suggests that these conformational changes may occur in a variety of hydrocarbon amphiphiles transferred from the air/water interface. This conformational ordering may be due to a kinetically limited phase transition taking place in the meniscus formed between the solid substrate and aqueous subphase. In addition, the results obtained for both the phospholipid and fatty acid suggest that the structure of the amphiphile may help determine the extent and nature of the transfer-speed-induced structural changes taking place in the monomolecular film.

The Structure and Phases of a Relaxed Langmuir Monolayer of Methyl Eicosanoate as Determined by Grazing Incidence Xray Diffraction and Brewster Angle Microscopy

1994 ◽  
Vol 375 ◽  
Author(s):  
W. J. Foster ◽  
M. C. Shih ◽  
P. S. Pershan
Keyword(s):  
Molecular Structure ◽  
Phase Diagram ◽  
Grazing Incidence ◽  
Brewster Angle ◽  
Water Interface ◽  
Brewster Angle Microscopy ◽  
X Ray Diffraction ◽  
Monolayer Films ◽  
X Ray ◽  
Air Water Interface

AbstractThe molecular structure and phase diagram of relaxed monolayer films of methyl eicosanoate at the air/water interface were studied using x-ray diffraction and Brewster Angle Microscopy. Six phases have been identified in relaxed films in a temperature range of 5 to 28 degrees Celsius.

Electron Transfer Photofragmentation Reactions in Monolayer Films at the Air/Water Interface

Langmuir ◽  
1998 ◽  
Vol 14 (13) ◽  
pp. 3663-3672 ◽  
Author(s):  
Lucian A. Lucia ◽  
Kataryna Wyrozebski ◽  
Liaohai Chen ◽  
Cristina Geiger ◽  
David G. Whitten
Keyword(s):  
Electron Transfer ◽  
Water Interface ◽  
Monolayer Films ◽  
Air Water Interface

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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