Textures of surfactant monolayers

Fischer, Thomas M.; Bruinsma, Robijn; Knobler, Charles M.

doi:10.1103/physreve.50.413

Cited by 86 publications

(109 citation statements)

References 24 publications

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“…Introduction of sensitive microscopic techniques such as fluorescence microscopy [1,2] and Brewster angle microscopy (BAM) [3,4] allows in situ visualization of these phases at the air-water interface. With these techniques, an exciting variety of shapes such as circular [5][6][7], fingering [8,9], dentritic [10,11], dumbbell [12,13] and a number of textures such as stripe [14,15] star [16,17] and boojum [17,18] have been visualized in the 2-D monolayer phases. The shapes and textures of the condensed-phase domains depend on a variety of factors such as the subphase temperature [5][6][7][8], the impurity content [19,20], the pH [21] and the structure of the amphiphile [22,23].…”

Section: Introductionmentioning

confidence: 99%

Temperature dependent dendritic domain shapes in Langmuir monolayers of tetradecanoyl N-ethanolamide at the air–water interface

Hossain

Iimura

Yoshida

et al. 2011

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Temperature dependent dendritic domain shapes in Langmuir monolayers of tetradecanoyl N-ethanolamide at the air–water interface

Hossain

Iimura

Yoshida

et al. 2011

Journal of Colloid and Interface Science

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“…Although broadened peaks have been observed from 2D hexatic phases of freely suspended thin liquid crystal films, 7,48,50 the evidence that they have been observed for LM is ambiguous. [67][68][69][70] In any event, they would certainly not be observable for liquid LM phases of behenic acid, or similar systems. 11,18,19,28,71,72 …”

Section: S͑q Xymentioning

confidence: 99%

C 60 -propylamine adduct monolayers at the gas/water interface: A Brewster angle microscopy and x-ray scattering study

Fukuto

Penanen

Heilmann

et al. 1997

The Journal of Chemical Physics

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Brewster angle microscopy ͑BAM͒, x-ray specular reflectivity and grazing-incidence x-ray diffraction ͑GID͒ studies of C 60 -propylamine adduct monolayers at the gas/water interface as a function of molecular area are reported. At large molecular areas (AϾϳ150 Å 2 /molecule), BAM images reveal macroscopic heterogeneity in the film, consisting of the coexistence between regions covered with uniform solidlike monolayer and bare water surface. After compression to a limiting molecular area of 150 Å 2 /molecule, the film is observed to be homogeneous, with the uniform monolayer covering the entire available surface. Both the x-ray reflectivity results and the GID patterns are consistent with the formation of a uniform monolayer at Aϳ150 Å 2 /molecule, while the little dependence that the GID patterns have on the molecular area for AϾϳ150 Å 2 /molecule is consistent with the heterogeneity in the film. Upon further compression to higher densities (AϽϳ120 Å 2 /molecule), the x-ray reflectivity results suggest the formation of a partial layer either at the molecule/gas interface or at the molecule/water interface. In this high density regime, the shift in the observed GID pattern with molecular area is much smaller than would be expected if the film were to remain a homogeneous monolayer, also consistent with the formation of an inhomogeneous partial layer. The analysis of the broad GID pattern observed from a uniform monolayer in terms of a model 2D radial distribution function, implies a short range positional correlation, extending to only a few molecular distances. The average nearest neighbor distance (dϳ13 Å͒, extracted from the GID analysis, is consistent with the limiting molecular area (Aϳ150 Å 2 /molecule) assuming local hexagonal packing. These results together with the sharp facets observed in the BAM images demonstrate that the monolayer when uniform is a two-dimensional amorphous solid.

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“…In order to gain further understanding of the behavior of these derivatives, the C8METAB derivative was selected to be studied in mixtures with methyl stearate which possesses a head-group that is the same as the hydrophilic end-groups of this triaroylbenzene derivative and is a fatty ester, monolayers of which have been studied in significant detail [30][31][32][33][34]. The methyl stearate monolayer is in a tilted liquid-condensed phase (L 2 ) when the surface pressure first rises near 24 Å 2 molecule − 1 and then undergoes a transition to a vertically oriented liquidcondensed phase (LS) at the inflection in the isotherm just above 10 mN m − 1 .…”

Section: Surface Pressure Isotherm Resultsmentioning

confidence: 99%