Internal Reflectance IR Spectroscopy of Langmuir Monolayer Films at the Air-Water Interface

1997 ◽  
pp. 679-681
Author(s):  
Suci Widayati ◽  
Susan M. Stephens ◽  
Richard A. Dluhy
Keyword(s):  
Ir Spectroscopy ◽  
Langmuir Monolayer ◽  
Water Interface ◽  
Monolayer Films ◽  
Air Water Interface ◽  
Internal Reflectance

scholarly journals Ultrafast to Ultraslow Dynamics of a Langmuir Monolayer at the Air/Water Interface Observed with Reflection Enhanced 2D IR Spectroscopy

2017 ◽  
Vol 139 (46) ◽  
pp. 16518-16527 ◽  
Author(s):  
Chang Yan ◽  
Joseph E. Thomaz ◽  
Yong-Lei Wang ◽  
Jun Nishida ◽  
Rongfeng Yuan ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Langmuir Monolayer ◽  
Water Interface ◽  
2D Ir ◽  
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.

Investigations at the air/water interface using polarization modulation IR spectroscopy

1996 ◽  
Vol 92 (4) ◽  
pp. 525 ◽  
Author(s):  
Daniel Blaudez ◽  
Jean-Marie Turlet ◽  
Jean Dufourcq ◽  
Delphine Bard ◽  
Thierry Buffeteau ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Polarization Modulation ◽  
Water Interface ◽  
Air Water Interface

Effect of Chain Microstructure and Subphase pH on the Surface Properties and Aggregation Behavior of Amphiphilic Copolymers Based on Fluoroacrylates

2019 ◽  
Vol 816 ◽  
pp. 312-317
Author(s):  
Alexandra O. Grigoreva ◽  
E.Y. Polozov ◽  
S.D. Zaitsev
Keyword(s):  
Acrylic Acid ◽  
Surface Properties ◽  
Butyl Acrylate ◽  
Langmuir Monolayer ◽  
Aggregation Behavior ◽  
Reactivity Ratios ◽  
Water Interface ◽  
Amphiphilic Copolymers ◽  
Air Water Interface ◽  
Raft Agent

Copolymerization of 2,2,3,3,4,4,5,5-octafluoropentyl acrylate (OFPA) and acrylic acid (AA), OFPA and tert-butyl acrylate (t-BA) in presence ofdibenzylcarbonotrithioate (BTC) and polymeric RAFT-agents was studied, reactivity ratios were calculated. It was shown that type of RAFT-agent can influence on chain microstructure of obtained polymers. Aggregation behavior of obtained amphiphilic copolymers with different microstructures at the air/water interface was characterized by the Langmuir monolayer technique. The effect of the microstructureand subphase pH on the isotherm curves were shown.

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