Characterization of Langmuir and Langmuir–Blodgett films of an octasubstituted zinc phthalocyanine

Torrent‐Burgués, J.; Cea, Pilar; Giner, Ignacio; Guaus, E.

doi:10.1016/j.tsf.2014.01.045

“…Other salts' compression isotherm plots are shown in Figure 4 [37][38][39]. The information provided by the -A isotherm, the elasticity modulus, was determined to be evaluated in more detail as follows.…”

Section: Effect Of Sub-phase On Monoolein Lipid Langmuir Monolayermentioning

confidence: 99%

“…Many researchers conduct the elasticity modulus recognition based on Eq. 1 for the selection of parameters based on the physical state of the lipid monolayer, in their extension analysis toward the Langmuir isotherm [37][38][39]. The information provided by the -A isotherm, the elasticity modulus, was determined to be evaluated in more detail as follows.…”

Section: Determination Of Elasticity Modulus and Surface Compressibilmentioning

confidence: 99%

“…However, lipid surfactants have attracted a lot of attention on the air-water interface to create a Langmuir monolayer, to monitor the interface of the molecular structure. Additionally, combinations of various sub-phase solutions are employed to understand both the fundamental knowledge of lipid interaction and the monolayer formation influence, as well as the role of net loading [38,40]. A derived compressibility equation of the modulus is defined using the mean molecular area of the monolayer on the air-water interface to deduce the physical state and orientation of the formed monolayer Langmuir.…”

Section: Determination Of Elasticity Modulus and Surface Compressibilmentioning

confidence: 99%

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

Dhopte

¹

,

Lad

²

2021

Preprint

0

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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.

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“…1), versus surface pressure obtained from these isotherms. The criteria that relate the elastic modulus values with the physical state of the monolayer is [45,46]: C s -1 <100 mN•m -1 for liquid expanded (LE) state, 100-250 mN•m -1 for liquid condensed (LC) state, >250 mN•m -1 for solid (S) state.…”

Section: Influence Of Lysozyme Over Lipid Monolayer Isothermsmentioning

confidence: 99%

Effect of lysozyme subphase and insertion on several lipid films

Torrent‐Burgués¹,

Raju²

2019

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The influence of proteins on lipid monolayers is a subject of biological interest. In this work the influence of lysozyme on lipid films of stearic acid, oleic acid, cholesterol, DPPC and POPC has been studied. The Langmuir monolayer technique, using surface pressure-area isotherms and elastic modulus plots, as well as protein insertion experiments in lipid monolayers, have been used. Results indicate that lysozyme affects the lipid monolayer formation, the elastic modulus and, sometimes, the physical state of the monolayer. This influence is more important till moderate surface pressures. At high surface pressures and near the physiological value of lateral pressure of 33 mN/m, there is expulsion of lysozyme out of the monolayer. This expulsion is more important for stearic acid, DPPC and POPC. The lower value of maximum insertion pressure is for stearic acid and the higher one is for oleic acid. The relation between the initial and the increased surface pressure in insertion experiments has been analysed.

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“…From the point of view of the molecular structure shown below, it is composed of a hydrocarbon chain, which is attached by an ester bond to a glycerol backbone (see Figure 1). Macroscopically speaking, the moiety of glycerol gives polar characteristics to this part of the molecule for a hydrophobic head, which implies that the formation of hydrogen bonds with water in aqueous solutions by the hydrocarbon chain known as the hydrophilic tail, with a double bond position, is highly hydrophobic [39]. In water and cold alcohol, monoolein is insoluble but is regularly soluble in oil, petroleum ether, chloroform, and even hot alcohol.…”

Section: Introductionmentioning

confidence: 99%

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

Dhopte

¹

,

Lad

²

2021

Preprint

0

View full text Add to dashboard Cite

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.

show abstract

Characterization of Langmuir and Langmuir–Blodgett films of an octasubstituted zinc phthalocyanine

Abstract: In this work we report the fabrication of Langmuir and Langmuir-Blodgett (LB) films of a substituted ZnPc (octakis(oxyoctyl)

Cited by 22 publications

References 40 publications

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

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

Effect of lysozyme subphase and insertion on several lipid films

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

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