Electrochemistry at the water/air interface. Lateral electron transport in Langmuir monolayers

1988 ◽  
Vol 110 (6) ◽  
pp. 2009-2011 ◽  
Author(s):  
Cindra A. Widrig ◽  
Cary J. Miller ◽  
Marcin. Majda
Keyword(s):  
Electron Transport ◽  
Langmuir Monolayers ◽  
Air Interface

Langmuir Monolayers ofp-(5‘-m-Terphenylyl)benzoic Acid and Its 2‘-Methyl Derivative at the Water/Air Interface

Langmuir ◽  
1996 ◽  
Vol 12 (20) ◽  
pp. 4966-4968 ◽  
Author(s):  
Jan Czapkiewicz ◽  
Patrycja Dynarowicz ◽  
Piotr Milart
Keyword(s):  
Benzoic Acid ◽  
Langmuir Monolayers ◽  
Methyl Derivative ◽  
Air Interface

Energetics and structures of the tilted phases of fatty acid Langmuir monolayers

2020 ◽  
Vol 22 (21) ◽  
pp. 12092-12103
Author(s):  
Óscar Toledano ◽  
Miguel A. Rubio ◽  
Óscar Gálvez
Keyword(s):  
Fatty Acid ◽  
Langmuir Monolayers ◽  
Dimensional Structure ◽  
Amphiphilic Molecules ◽  
Air Interface

Langmuir monolayers are monomolecular deep films composed of amphiphilic molecules which are typically confined to a water/air interface in a bi-dimensional structure.

scholarly journals Characterization of Monoolein Langmuir Monolayers Spread at The Salt Solution/Air Interface

2021 ◽  
Author(s):  
Balaji Sopanrao Dhopte ◽  
V. N. Lad
Keyword(s):  
Physicochemical Properties ◽  
Molecular Layer ◽  
Langmuir Monolayers ◽  
Langmuir Monolayer ◽  
Compression Isotherm ◽  
Water Interface ◽  
Air Interface ◽  
Special Groups ◽  
Air Water Interface ◽  
The Difference

Abstract The Langmuir monolayer is commonly described at interfaces for an insoluble homogenous single molecular layer. Langmuir monolayers have demonstrated various issues regarding soft matters and complex fluids by forming ideal uniform two-dimensional structures over the air-water interface. This monolayer has advantages for evaluating physicochemical properties at interfaces and, for the insoluble molecules, can be applied simultaneously to the different interaction occurrences at interfaces. For this experiment, monoolein lipid was used as a spreading solvent to create a Langmuir monolayer, and five different types of salt sub-phases were applied for the physicochemical properties’ interaction studies. On the air-water interface, the surface properties of monoolein lipids were investigated for interfacial phase behaviors, using the Wilhelmy plate pressure sensor technique compression isotherm (π-A). Data and analysis were also contributed to the correspondent, precise verification of physical state behavior with the surface pressure measurements on the interfaces through the compressibility modulus and the elasticity modulus parameters on the surface. In the experiments, the interfacial activity of the monoolein lipids was found to be stable on the aqueous sub-phase, while the area per molecule over the interface did not have much impact as a sub-phase with a change in salts. The repeatability and reproducibility of tests were affirmed by the difference in the Langmuir monolayer’s particular phase transition orientation behavior and the stability of colloidal lipid dispersion. However, Langmuir monolayer formation contributes to several special groups being restructured and is found to be a more remarkable natural process for their attractive organic dynamic structural properties over the interface, but the interfacial molecular dynamics have proven to be difficult to calculate.

scholarly journals Characterization of Monoolein Langmuir Monolayers Spread at The Salt Solution/Air Interface

2021 ◽  
Author(s):  
Balaji Sopanrao Dhopte ◽  
V. N. Lad
Keyword(s):  
Physicochemical Properties ◽  
Molecular Layer ◽  
Langmuir Monolayers ◽  
Langmuir Monolayer ◽  
Compression Isotherm ◽  
Water Interface ◽  
Air Interface ◽  
Special Groups ◽  
Air Water Interface ◽  
The Difference

Abstract The Langmuir monolayer is commonly described at interfaces for an insoluble homogenous single molecular layer. Langmuir monolayers have demonstrated various issues regarding soft matters and complex fluids by forming ideal uniform two-dimensional structures over the air-water interface. This monolayer has advantages for evaluating physicochemical properties at interfaces and, for the insoluble molecules, can be applied simultaneously to the different interaction occurrences at interfaces. For this experiment, monoolein lipid was used as a spreading solvent to create a Langmuir monolayer, and five different types of salt sub-phases were applied for the physicochemical properties’ interaction studies. On the air-water interface, the surface properties of monoolein lipids were investigated for interfacial phase behaviors, using the Wilhelmy plate pressure sensor technique compression isotherm (π-A). Data and analysis were also contributed to the correspondent, precise verification of physical state behavior with the surface pressure measurements on the interfaces through the compressibility modulus and the elasticity modulus parameters on the surface. In the experiments, the interfacial activity of the monoolein lipids was found to be stable on the aqueous sub-phase, while the area per molecule over the interface did not have much impact as a sub-phase with a change in salts. The repeatability and reproducibility of tests were affirmed by the difference in the Langmuir monolayer’s particular phase transition orientation behavior and the stability of colloidal lipid dispersion. However, Langmuir monolayer formation contributes to several special groups being restructured and is found to be a more remarkable natural process for their attractive organic dynamic structural properties over the interface, but the interfacial molecular dynamics have proven to be difficult to calculate.

Location of menaquinone and menaquinol headgroups in model membranes

2020 ◽  
Vol 98 (6) ◽  
pp. 307-317
Author(s):  
Cameron Van Cleave ◽  
Heide A. Murakami ◽  
Nuttaporn Samart ◽  
Jordan T. Koehn ◽  
Pablo Maldonado ◽  
...  
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Electron Transport ◽  
Cell Membrane ◽  
Langmuir Monolayers ◽  
Model Membrane ◽  
Model Membranes ◽  
Membrane Interfaces

Menaquinones are lipoquinones that consist of a headgroup (naphthoquinone, menadione) and an isoprenyl sidechain. They function as electron transporters in prokaryotes such as Mycobacterium tuberculosis. For these studies, we used Langmuir monolayers and microemulsions to investigate how the menaquinone headgroup (menadione) and the menahydroquinone headgroup (menadiol) interact with model membrane interfaces to determine if differences are observed in the location of these headgroups in a membrane. It has been suggested that the differences in the locations are mainly caused by the isoprenyl sidechain rather than the headgroup quinone-to-quinol reduction during electron transport. This study presents evidence that suggests the influence of the headgroup drives the movement of the oxidized quinone and the reduced hydroquinone to different locations within the interface. Utilizing the model membranes of microemulsions and Langmuir monolayers, it is determined whether or not there is a difference in the location of menadione and menadiol within the interface. Based on our findings, we conclude that the menadione and menadiol may reside in different locations within model membranes. It follows that if menaquinone moves within the cell membrane upon menaquinol formation, it is due at least in part, to the differences in the properties of headgroup interactions with the membrane in addition to the isoprenyl sidechain.

scholarly journals Characterization of Monoolein Langmuir Monolayers Spread at The Salt Solution/Air Interface

2021 ◽  
Author(s):  
Balaji Sopanrao Dhopte ◽  
Virangkumar N. Lad
Keyword(s):  
Physicochemical Properties ◽  
Molecular Layer ◽  
Langmuir Monolayers ◽  
Langmuir Monolayer ◽  
Compression Isotherm ◽  
Water Interface ◽  
Air Interface ◽  
Special Groups ◽  
Air Water Interface ◽  
The Difference

Abstract The Langmuir monolayer is commonly described at interfaces for an insoluble homogenous single molecular layer. Langmuir monolayers have demonstrated various issues regarding soft matters and complex fluids by forming ideal uniform two-dimensional structures over the air-water interface. This monolayer has advantages for evaluating physicochemical properties at interfaces and, for the insoluble molecules, can be applied simultaneously to the different interaction occurrences at interfaces. For this experiment, monoolein lipid was used as a spreading solvent to create a Langmuir monolayer, and five different types of salt sub-phases were applied for the physicochemical properties’ interaction studies. On the air-water interface, the surface properties of monoolein lipids were investigated for interfacial phase behaviors, using the Wilhelmy plate pressure sensor technique compression isotherm (π-A). Data and analysis were also contributed to the correspondent, precise verification of physical state behavior with the surface pressure measurements on the interfaces through the compressibility modulus and the elasticity modulus parameters on the surface. In the experiments, the interfacial activity of the monoolein lipids was found to be stable on the aqueous sub-phase, while the area per molecule over the interface did not have much impact as a sub-phase with a change in salts. The repeatability and reproducibility of tests were affirmed by the difference in the Langmuir monolayer’s particular phase transition orientation behavior and the stability of colloidal lipid dispersion. However, Langmuir monolayer formation contributes to several special groups being restructured and is found to be a more remarkable natural process for their attractive organic dynamic structural properties over the interface, but the interfacial molecular dynamics have proven to be difficult to calculate.

The role of ligands in electron transport in nanocrystal solids

Nanoscale ◽  
2020 ◽  
Vol 12 (45) ◽  
pp. 23028-23035
Author(s):  
Artem R. Khabibullin ◽  
Alexander L. Efros ◽  
Steven C. Erwin
Keyword(s):  
Electron Transport ◽  
Theoretical Modeling

Theoretical modeling of wavefunction overlap in nanocrystal solids elucidates the important role played by ligands in electron transport.

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