Two-dimensional micronodule structure in monolayers of a partially fluorinated long-chain acid observed by atomic force microscopy

Kato, Takeshi; Kameyama, Makoto; Kawano, Mutsuhiro

doi:10.1016/0040-6090(95)06774-4

Cited by 15 publications

(15 citation statements)

References 11 publications

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“…As far as the normal saturated hydrogenated alcohols are concerned, their Langmuir monolayers properties are described in a large number of papers and some general information can be found, for example, in the monography by Gaines . On the contrary, not many reports on monolayer properties from perfluorinated alcohols (as 1H,1H perfluorooctadecanol) can be found in the literature; ,, however, some papers reporting surface behavior of related compounds like semifluorinated thiols , or semifluorinated carboxylic acids − have been published. Generally, monolayers formed by 1H,1H-perfluorooctadecanol (F18OH) are homogeneous at lower surface pressures; however, upon compression, some 3D crystallites appear, the number of which grows with rising surface pressure.…”

Section: Resultsmentioning

confidence: 99%

Semifluorinated Chains at the Air/Water Interface: Studies of the Interaction of a Semifluorinated Alkane with Fluorinated Alcohols in Mixed Langmuir Monolayers

Broniatowski

Dynarowicz-Łątka

2006

Langmuir

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Mixtures of a semifluorinated alkane 1,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10-henicosafluorotriacontane (abbr. F10H20) and different alcohols were investigated at the air/water interface using surface pressure-area isotherms complemented with BAM images. In our studies, octadecanol and its fluorinated derivatives differing in the degree of fluorination were researched. To verify the influence of an iso branching of the fluorinated segment in an alcohol molecule, the properties of perfluorooctyldecanol and perfluoro-iso-nonyldecanol in mixtures with F10H20 were compared. From the isotherms datapoints, the excess of free energy of mixing (DeltaG(exc)) together with the interaction parameter (alpha) were calculated. On the basis of the additivity rule and BAM images, phase diagrams for all of the investigated systems were constructed. It occurs that F10H20 mixes with the fully hydrogenated alcohol, octadecanol, within the whole range of alcohol mole fractions, whereas it is completely immiscible with its perfluorinated analogue. Regarding the mixtures of F10H20 with semifluorinated alcohols, it turned out that these systems exhibit limited miscibility, i.e., are miscible at a low semifluorinated alcohol proportion, whereas upon increasing alcohol content, the systems start to demix. It may be concluded that the molecular packing in mixed monolayers is the key factor determining the miscibility of F10H20 of the investigated alcohols.

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Section: Resultsmentioning

confidence: 99%

Semifluorinated Chains at the Air/Water Interface: Studies of the Interaction of a Semifluorinated Alkane with Fluorinated Alcohols in Mixed Langmuir Monolayers

Broniatowski

Dynarowicz-Łątka

2006

Langmuir

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“…Figure 10A shows a further expanded AFM image of the same sample in Figure 4A of 20 × 20 nm 2 . In this much expanded image, resolution of AFM attains to the molecular size, but we could not observe any regularity of molecular arrangement such as that found in twodimensional molecular crystals.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, we have found that there are two-dimensional molecular clusters of nanometer size in spread monolayers of partially fluorinated long-chain acids using AFM. 2 The size of the smallest one is about 17 nm in diameter and the size distribution is sharply monodisperse.…”

Section: Introductionmentioning

confidence: 99%

Monodisperse Two-Dimensional Nanometer Size Clusters of Partially Fluorinated Long-Chain Acids

et al. 1998

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Two-dimensional molecular clusters of a few tens nanometer size were found in spread monolayers of a series of partially fluorinated long-chain acids. Atomic force microscopy images have revealed that the size of the clusters is sharply monodisperse. The size changes systematically with changing structure of the hydrophobic chain of the amphiphiles. The smallest cluster has a circular shape of 17 nm diameter. One cluster is composed of about 700 film molecules. These clusters gather to form macroscopic domains of millimeter size without compression. A formation mechanism of these molecular clusters is discussed. Clusters are formed during the spreading process due to the instability of the film materials at the spreading process. It was made clear that cluster formation during the spreading is rather general for amphiphiles under the conditions where condensed monolayers are formed.

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“…29,30 Recently, large circular aggregates have been observed by using the Langmuir-Blodgett technique [31][32][33] to deposit insoluble monolayers of partially fluorinated long chain fatty acids from the air-water interface onto a solid substrate, followed by characterisation of the monolayer structure with AFM. 34 Regularly sized, circular, two dimensional domains composed of monolayers of low molecular weight surfactants were shown to form regularly ordered 2D domains with aggregation numbers of roughly 700 molecules.…”

Section: Introductionmentioning

confidence: 99%

Tuneable interfacial surfactant aggregates mimic lyotropic phases and facilitate large scale nanopatterning

et al. 2021

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Two-dimensional micronodule structure in monolayers of a partially fluorinated long-chain acid observed by atomic force microscopy

Cited by 15 publications

References 11 publications

Semifluorinated Chains at the Air/Water Interface: Studies of the Interaction of a Semifluorinated Alkane with Fluorinated Alcohols in Mixed Langmuir Monolayers

Semifluorinated Chains at the Air/Water Interface: Studies of the Interaction of a Semifluorinated Alkane with Fluorinated Alcohols in Mixed Langmuir Monolayers

Monodisperse Two-Dimensional Nanometer Size Clusters of Partially Fluorinated Long-Chain Acids

Tuneable interfacial surfactant aggregates mimic lyotropic phases and facilitate large scale nanopatterning

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