Influence of temperature and alkyl chain length on phase behavior in Langmuir monolayers of some oxyethylenated nonionic surfactants

Islam, Nazrul; Kato, Takeshi

doi:10.1016/j.jcis.2005.07.023

Cited by 21 publications

(17 citation statements)

References 43 publications

(53 reference statements)

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“…However, they reflect adequately the experimental trend for the LE-LC transition that with an increase in temperature the area per surfactant molecule of a fixed alkyl chain length decreases, and vice versa, with an increase in the surfactant chain length at a fixed temperature, the value of A c increases. This is consistent with the "temperature effect" of clusterization, registered experimentally [49][50][51] and described on the basis of quantum chemical 2) with an increase in the temperature, A c for a surfactant with a given alkyl chain length decreases, and, conversely, with an increase in the surfactant chain length at a fixed temperature the value of A c increases.…”

Section: Analysis Of a C Values For Surfactant Monolayerssupporting

confidence: 89%

Quantum chemical assessment of the molecular area corresponding to the onset of the LE–LC phase transition for amphiphilic 2D monolayers at the air/water interface

Kartashynska

Vollhardt

2021

Phys. Chem. Chem. Phys.

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Section: Analysis Of a C Values For Surfactant Monolayerssupporting

confidence: 89%

Quantum chemical assessment of the molecular area corresponding to the onset of the LE–LC phase transition for amphiphilic 2D monolayers at the air/water interface

Kartashynska

Vollhardt

2021

Phys. Chem. Chem. Phys.

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“…This interaction is specific for annexin A1 and is conveyed by its unique N‐terminal domain (40). The condensed phase is characterized by highly ordered tight packing of lipid molecules and is stabilized as the length of lipid acyl chains increases (41). Natural ceramides with long fatty acid chains of ≥16 carbon atoms increase the order of acyl chains within the lipid bilayer and induce a phase separation of highly ordered ceramide‐rich domains and less ordered ceramide‐poor domains (5,6).…”

Section: Discussionmentioning

confidence: 99%

“…Red arrow, conversion of SM to Cer catalysed by aSMase (4). Green arrow, the spontaneous transbilayer equilibration of ceramide (41).…”

Section: Mechanisms Of a Selective Interaction Between Ceramide-rich mentioning

confidence: 99%

Fluorescent Annexin A1 Reveals Dynamics of Ceramide Platforms in Living Cells

Babiychuk

Monastyrskaya

Draeger

2008

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Upon its genesis during apoptosis, ceramide promotes gross reorganization of the plasma membrane structure involving clustering of signalling molecules and an amplification of vesicle formation, fusion and trafficking. The annexins are a family of proteins, which in the presence of Ca 21 , bind to membranes containing negatively charged phospholipids. Here, we show that ceramide increases affinity of annexin A1-membrane interaction. In the physiologically relevant range of Ca 21 concentrations, this leads to an increase in the Ca 21 sensitivity of annexin A1-membrane interaction. In fixed cells, using a ceramidespecific antibody, we establish a direct interaction of annexin A1 with areas of the plasma membrane enriched in ceramide (ceramide platforms). In living cells, the intracellular dynamics of annexin A1 match those of plasmalemmal ceramide. Among proteins of the annexin family, the interaction with ceramide platforms is restricted to annexin A1 and is conveyed by its unique N-terminal domain. We demonstrate that intracellular Ca 21 overload occurring at the conditions of cellular stress induces ceramide production. Using fluorescently tagged annexin A1 as a reporter for ceramide platforms and annexin A6 as a non-selective membrane marker, we visualize ceramide platforms for the first time in living cells and provide evidence for a ceramide-driven segregation and internalization of membrane-associated proteins.

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“…6 follow the structural changes of the monolayer, and are highly correlated with the corresponding compressibility modulus κ s (R = 0.926). 62,63 Due to further increase of compression the long-range dipolar-repulsive interactions between the molecules tend to stabilize the elongated structures 62 as seen on the BAM image [ Fig. With the decrease of average area per molecule these structures start to become more compact and elongate, yet separated, displaying effects of long-range ordering [ Fig.…”

Section: A Simple Amphiphilesmentioning

confidence: 99%

Application of Brewster angle microscopy and fractal analysis in investigations of compressibility of Langmuir monolayers

Risović

Frka²,

Kozarac³

2011

The Journal of Chemical Physics

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The aim of this study was to investigate the connection between the lipid/amphiphile monolayer structure at the interface and its macroscopic/rheological properties, in particular, to establish the link between the fractality of the monolayer structure and its compressibility modulus. To that purpose we have used fractal analysis of images obtained by Brewster angle microscopy to infer the fractal dimension of the monolayer structure and relate its change to the corresponding changes in compressibility derived from a simultaneously measured π-A isotherm. The results of the study confirmed the starting assumption based on theoretical considerations that the fractal dimension of an amphiphilic monolayer and its compressibility should be correlated. We have shown that there exists a strong correlation between the fractal dimension and the corresponding compressibility modulus of different amphiphilic materials. Thus, confirming the link between the short ordered structure on the molecular level and the macroscopic property-compressibility of the monolayer. The established correlation between the fractal dynamics and compressibility modulus of the monolayer enabled identification of onset of percolation-a second-order phase transition that is otherwise not easy and unambiguously detectable. We have found that the signature of percolation in a monolayer, regardless of its composition, is the occurrence of a sharp increase (a jump) of compressibility modulus (at macroscopic level) at the characteristic value of the corresponding fractal dimension D = 1.89. This is the result of the abrupt establishment of a connected structure on the molecular level, consequently involving a change in the elastic properties of the monolayer on a macroscopic scale. The results of this investigation provide means for unambiguous identification of the onset of percolation in the Langmuir layer and should facilitate a more efficient application of the percolation theory in further study of processes and structures at the interface during the monolayer compression.

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Influence of temperature and alkyl chain length on phase behavior in Langmuir monolayers of some oxyethylenated nonionic surfactants

Cited by 21 publications

References 43 publications

Quantum chemical assessment of the molecular area corresponding to the onset of the LE–LC phase transition for amphiphilic 2D monolayers at the air/water interface

Quantum chemical assessment of the molecular area corresponding to the onset of the LE–LC phase transition for amphiphilic 2D monolayers at the air/water interface

Fluorescent Annexin A1 Reveals Dynamics of Ceramide Platforms in Living Cells

Application of Brewster angle microscopy and fractal analysis in investigations of compressibility of Langmuir monolayers

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