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

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.

Photoinduced electron transfer in a monolayer at the air-water interface

1992 ◽  
Vol 96 (14) ◽  
pp. 5939-5942 ◽  
Author(s):  
Mutsuyoshi Matsumoto ◽  
Ramesh C. Ahuja ◽  
Dietmar Moebius
Keyword(s):  
Electron Transfer ◽  
Photoinduced Electron Transfer ◽  
Water Interface ◽  
Air Water Interface

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.

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