Cd2+-Induced Interfacial Structural Changes of Langmuir−Blodgett Films of Stearic Acid on Solid Substrates:  A Sum Frequency Generation Study

Langmuir ◽  
2004 ◽  
Vol 20 (2) ◽  
pp. 357-365 ◽  
Author(s):  
Shen Ye ◽  
Hiroyuki Noda ◽  
Takuma Nishida ◽  
Shigeaki Morita ◽  
Masatoshi Osawa
Keyword(s):  
Stearic Acid ◽  
Structural Changes ◽  
Sum Frequency Generation ◽  
Sum Frequency ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Langmuir Blodgett Films ◽  
Frequency Generation

Molecular Orientation of Asphaltenes and PAH Model Compounds in Langmuir−Blodgett Films Using Sum Frequency Generation Spectroscopy

Langmuir ◽  
2011 ◽  
Vol 27 (10) ◽  
pp. 6049-6058 ◽  
Author(s):  
A. Ballard Andrews ◽  
Arthur McClelland ◽  
Oona Korkeila ◽  
Alexander Demidov ◽  
Amber Krummel ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Sum Frequency Generation ◽  
Model Compounds ◽  
Sum Frequency ◽  
Langmuir Blodgett ◽  
Sum Frequency Generation Spectroscopy ◽  
Langmuir Blodgett Films ◽  
Frequency Generation

New Strategies for Preparing Electrically Conductive Langmuir-Blodgett Films

1992 ◽  
Vol 247 ◽  
Author(s):  
J. H. Cheung ◽  
R. B. Rosner ◽  
M. F. Rubner
Keyword(s):  
Electrical Properties ◽  
Stearic Acid ◽  
Structural Changes ◽  
Solid State Reactions ◽  
Emeraldine Base ◽  
Structure Property ◽  
Electrically Conductive ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films

ABSTRACTThe fabrication, structure and electrical properties of new electrically conductive Langmuir-Blodgett (LB) films of polyaniline and polypyrrole have been investigated. Polyaniline in its emeraldine-base form was mixed with stearic acid (PAN-B/SA) to produce stable films at the air-water interface (5/1 or 10/1 mole ratio of PAN-B/SA). These films were then transferred into multilayer films which were found to exhibit conductivities of about 1 S/cm upon doping with hydrochloric acid. The alkyl chains of the stearic acid molecules were found to be distributed randomly throughout the LB film thereby exerting a minimal influence on the electrical properties of the polyaniline phase. In addition to this mixed monolayer approach, a novel method of fabricating highly conductive polypyrrole LB films has been developed. This method is based on the sequential exposure of ferric stéarate LB films to hydrogen chloride (HC1) gas and pyrrole vapor. Each of these two solid state reactions was found to impart dramatic chemical and structural changes to the film. Polypyrrole LB films with conductivities as high as 5 S/cm were produced via this process. The electrical and optical properties of films made by both techniques were examined in order to elucidate their structure/property relationships.

Molecular conformation of DPPC phospholipid Langmuir and Langmuir–Blodgett monolayers studied by heterodyne-detected vibrational sum frequency generation spectroscopy

2017 ◽  
Vol 19 (3) ◽  
pp. 2060-2066 ◽  
Author(s):  
Naoki Takeshita ◽  
Masanari Okuno ◽  
Taka-aki Ishibashi
Keyword(s):  
Molecular Conformation ◽  
Fused Silica ◽  
Langmuir Monolayer ◽  
Sum Frequency Generation ◽  
Molecular Structures ◽  
Sum Frequency ◽  
Langmuir Blodgett ◽  
Silica Substrate ◽  
Sum Frequency Generation Spectroscopy ◽  
Frequency Generation

Heterodyne-detected vibrational sum frequency generation spectroscopy was used to investigate molecular structures of DPPC monolayers on water (Langmuir monolayer) and monolayers on a fused silica substrate (Langmuir-Blodgett [LB] monolayer).

Application of the sum-frequency generation to the vibrational spectroscopy of a Langmuir-Blodgett film

1995 ◽  
Vol 51 (4) ◽  
pp. 3174-3181 ◽  
Author(s):  
V. Pflumio ◽  
J. C. Vallet ◽  
A. J. Boeglin ◽  
A. A. Villaeys ◽  
J. P. Lavoine
Keyword(s):  
Vibrational Spectroscopy ◽  
Sum Frequency Generation ◽  
Blodgett Film ◽  
Sum Frequency ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Film ◽  
Frequency Generation

ORIENTATION REARRANGEMENT AND AGGREGATION OF OXADIAZOLE TYPE DYE

2004 ◽  
Vol 13 (03n04) ◽  
pp. 553-558 ◽  
Author(s):  
SANG GIL YEOM ◽  
DAEWON SOHN ◽  
BONG GI KIM ◽  
SOO YOUNG PARK ◽  
HEESUN JUN ◽  
...  
Keyword(s):  
Sum Frequency Generation ◽  
Orientation Effect ◽  
Dye Molecules ◽  
Microscopic Images ◽  
Sum Frequency ◽  
Langmuir Blodgett ◽  
Alkyl Chains ◽  
Surface Normal ◽  
Pressure Area ◽  
Frequency Generation

Monolayer properties of 2-(3,4,5-tris-dodecyloxyl-phenyl)-[1,3,4] oxadiazole based "tripod" dye molecules, P2G, have been studied by Langmuir–Blodgett technique, UV and polarizing microscopic images. Pressure-area isotherm of P2G has transition at 17 mN/m and this transition is believed to be the orientation rearrangement of the molecules from perpendicular to horizontal with respect to the surface normal. The presence of water insoluble hydrophobic single alkyl chains causes restructuring edge-on orientation and aggregation by compression. The H-aggregated structure was observed by UV spectrometer, and the orientation effect was clearly observed by polarizing microscopic images and sum frequency generation.

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