Studies on monolayers. Part 1. Surface tension and absorption spectroscopic measurements of monolayers of surface-active azo and stilbene dyes
Abstract
In order to develop new molecules as function components of monolayer assemblies, a series of 9 surface-active azo and stilbene compounds are synthesized. Their monolayer properties at the air-water interface are studied by surface pressure-surface area measurements and spectroscopic techniques. The results show that small changes in the molecular structure of the surfactants (such as, length of the fatty acid chain and type of the chromphore) have an immense influence on the monolayer properties. For monolayers of compounds I and III-VIII, van der Walls-like isotherms are obtained, which show a liquid expanded state, a phase transition region, and a condensed state. From monolayer absorbance spectra it is found that in the liquid expanded state at 100 to 110 sq angstroms/molecule the chromphores lie flatly on the water surface, forming monomers. The phase transition region of the isotherms can be assigned to a change of orientation of the chromophore axis (horizontal to vertical) and an aggregation process of the chromophores (monomers to H aggregates). 20 references.
- Authors:
- Publication Date:
- OSTI Identifier:
- 6140342
- Resource Type:
- Journal Article
- Journal Name:
- J. Am. Chem. Soc.; (United States)
- Additional Journal Information:
- Journal Volume: 102:7
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 02 PETROLEUM; 03 NATURAL GAS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AZO DYES; NUCLEAR MAGNETIC RESONANCE; SURFACE TENSION; STILBENE; ABSORPTION SPECTRA; ENHANCED RECOVERY; INTERFACES; ISOTHERM; LAYERS; MOLECULAR STRUCTURE; NATURAL GAS; PETROLEUM; TESTING; THIN FILMS; AROMATICS; AZO COMPOUNDS; DYES; ENERGY SOURCES; FILMS; FLUIDS; FOSSIL FUELS; FUEL GAS; FUELS; GAS FUELS; GASES; HYDROCARBONS; MAGNETIC RESONANCE; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; RECOVERY; RESONANCE; SPECTRA; SURFACE PROPERTIES; 020300* - Petroleum- Drilling & Production; 030900 - Natural Gas- Artificial Stimulation, Plowshare- (-1989); 400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)
Citation Formats
Heesemann, J. Studies on monolayers. Part 1. Surface tension and absorption spectroscopic measurements of monolayers of surface-active azo and stilbene dyes. United States: N. p., 1980.
Web. doi:10.1021/ja00527a004.
Heesemann, J. Studies on monolayers. Part 1. Surface tension and absorption spectroscopic measurements of monolayers of surface-active azo and stilbene dyes. United States. https://doi.org/10.1021/ja00527a004
Heesemann, J. 1980.
"Studies on monolayers. Part 1. Surface tension and absorption spectroscopic measurements of monolayers of surface-active azo and stilbene dyes". United States. https://doi.org/10.1021/ja00527a004.
@article{osti_6140342,
title = {Studies on monolayers. Part 1. Surface tension and absorption spectroscopic measurements of monolayers of surface-active azo and stilbene dyes},
author = {Heesemann, J},
abstractNote = {In order to develop new molecules as function components of monolayer assemblies, a series of 9 surface-active azo and stilbene compounds are synthesized. Their monolayer properties at the air-water interface are studied by surface pressure-surface area measurements and spectroscopic techniques. The results show that small changes in the molecular structure of the surfactants (such as, length of the fatty acid chain and type of the chromphore) have an immense influence on the monolayer properties. For monolayers of compounds I and III-VIII, van der Walls-like isotherms are obtained, which show a liquid expanded state, a phase transition region, and a condensed state. From monolayer absorbance spectra it is found that in the liquid expanded state at 100 to 110 sq angstroms/molecule the chromphores lie flatly on the water surface, forming monomers. The phase transition region of the isotherms can be assigned to a change of orientation of the chromophore axis (horizontal to vertical) and an aggregation process of the chromophores (monomers to H aggregates). 20 references.},
doi = {10.1021/ja00527a004},
url = {https://www.osti.gov/biblio/6140342},
journal = {J. Am. Chem. Soc.; (United States)},
number = ,
volume = 102:7,
place = {United States},
year = {Wed Mar 26 00:00:00 EST 1980},
month = {Wed Mar 26 00:00:00 EST 1980}
}