Relating Lattice and Domain Structures of Monoglyceride Monolayers

Brezesinski, Gerald; Scalas, Enrico; Struth, Bernd; Möhwald, Helmuth; Bringezu, Frank; Gehlert, U.; Weidemann, G.; Vollhardt, D.

doi:10.1021/j100021a048

Cited by 80 publications

(102 citation statements)

References 6 publications

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“…10 The segment angle was found to correlate to a particular lattice angle. 5 This lattice angle should increase with a decrease in the polar tilt angle. 5,10 Consequently, a crossover to six segments is expected with decreasing polar tilt angle.…”

Section: Resultsmentioning

confidence: 99%

“…5 This lattice angle should increase with a decrease in the polar tilt angle. 5,10 Consequently, a crossover to six segments is expected with decreasing polar tilt angle. The addition of 1-hexadecanol reduces the average headgroup size and thus the polar tilt angle.…”

Section: Resultsmentioning

confidence: 99%

“…Langmuir monolayers of most substances possess long-range tilt orientational order (up to several 100 µm) [8][9][10][11][12][13][14] while the positional order extends only over a few 100 Å. [1][2][3][4][5][6][7] However, for 1-hexadecylglycerol monolayers the length of the tilt orientational order was observed to fall below the resolution limit of the microscope during compression. 15 Monolayers of 1,2-hexadecandiol show the same behavior.…”

Section: Introductionmentioning

confidence: 99%

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Disorder in Langmuir Monolayers: 2. Relation between Disordered Alkyl Chain Packing and the Loss of Long-Range Tilt Orientational Order

et al. 1999

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A loss of long-range tilt orientational order in 1,2-hexadecandiol monolayers is observed by Brewster angle microscopy. It coincides with a coexistence of two different lattices in the monolayer over a large surface pressure range detected by grazing incidence X-ray diffraction. In one lattice the alkyl chains are tilted toward nearest neighbors and in the other toward next-nearest neighbors. In monolayers of 2-hydroxypalmitic acid, 2-palmitoylglycerol, and 2-hexadecanol a condensed phase with short-range tilt orientational order is formed. The diffraction patterns show a superposition of the peaks from lattices which differ with respect to the tilt azimuth of the alkyl chains. The behavior of 1,2-hexadecandiol monolayers is related to that of 2-hydroxypalmitic acid, 2-palmitoylglycerol, and 2-hexadecanol. In monolayers of 2-hydroxypalmitic acid/palmitic acid mixtures a crossover from one behavior to the other is observed. The loss of order in Langmuir monolayers is initiated by a misfit of alkyl chains and headgroups. Chains can only adapt to headgroups which are additionally too large perpendicular to the tilt direction by a distortion of their packing. If the size of the headgroup perpendicular to the tilt direction exceeds a particular value, a disordered packing results. If substances with smaller headgroups are added to such monolayers, initially the spacing perpendicular to the chain tilt direction is optimized and then second the polar tilt angle is reduced.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Disorder in Langmuir Monolayers: 2. Relation between Disordered Alkyl Chain Packing and the Loss of Long-Range Tilt Orientational Order

et al. 1999

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“…The domains and bubbles associated with boojums are not circular. Among the nontrivial domain shapes seen are protrusions on both bubbles and domains, at times sharp enough to be characterized as "cusps" [4,5] and indentations in domain boundaries which impart a cardioid appearance to the domain [6,7]. Such domains and bubbles with unusual textures and shapes ought to be observable in other tilted phases as well.…”

Section: Introductionmentioning

confidence: 99%

Theory of monolayers with boundaries: Exact results and perturbative analysis

Rudnick

Loh

1999

Phys. Rev. E

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Domains and bubbles in tilted phases of Langmuir monolayers contain a class of textures known as boojums. The boundaries of such domains and bubbles may display either cusplike features or indentations. We derive analytic expressions for the textures within domains and surrounding bubbles, and for the shapes of the boundaries of these regions. The derivation is perturbative in the deviation of the bounding curve from a circle. This method is not expected to be accurate when the boundary suffers large distortions, but it does provide important clues with regard to the influence of various energetic terms on the order-parameter texture and the shape of the domain or bubble bounding curve. We also look into the effects of thermal fluctuations, which include a sample-size-dependent effective line tension.

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“…Figura 3.6: esquema do arranjo experimental para a BAM Dentre as informações que a técnica de BAM permite obter, pode-se citar: c 1 ) a morfologia de monocamadas formadas por moléculas anfifílicas (Gehlert et al 1998, Deschenaux et al 1997, Vollhardt 1996; c 2 ) a orientação dos domínios na monocamada (Brezesinskin et al 1995, Overberck et al 1994); c 3 ) estimativa da espessura relativa da monocamada (Patino et al 1999, Miñones Jr. et al 2002.…”

Section: Microscopia No âNgulo De Brewster (Bam)unclassified

Caracterização das monocamadas mistas (DPPC+BCD) de Langmuir: efeito da estrutura e concentração do BCD e da força iônica na subfase

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Relating Lattice and Domain Structures of Monoglyceride Monolayers

Cited by 80 publications

References 6 publications

Disorder in Langmuir Monolayers: 2. Relation between Disordered Alkyl Chain Packing and the Loss of Long-Range Tilt Orientational Order

Disorder in Langmuir Monolayers: 2. Relation between Disordered Alkyl Chain Packing and the Loss of Long-Range Tilt Orientational Order

Theory of monolayers with boundaries: Exact results and perturbative analysis

Caracterização das monocamadas mistas (DPPC+BCD) de Langmuir: efeito da estrutura e concentração do BCD e da força iônica na subfase

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