Influence of the spreading solvent on the properties of monolayers at the air/water interface

Gericke, Arne; Simon-Kutscher, Johannes; Huehnerfuss, Heinrich

doi:10.1021/la00032a036

Cited by 48 publications

(41 citation statements)

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“…In order to form uniform monolayers, the solvent must transport the material homogeneously, evaporate completely from the water surface, and remain chemically inert. 11 Though the LB process is an excellent technique for creating films of predetermined thickness and composition, it is fraught with technical difficulties associated with the deposition kinetics. A better understanding of the spreading kinetics in the presence of evaporation can help control or modify the waste inherent in producing nonuniform monolayers.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of spontaneous spreading with evaporation on a deep fluid layer

Dussaud¹,

Troian²

1998

Physics of Fluids

118

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The spontaneous spreading of a thin volatile film along the surface of a deep fluid layer of higher surface tension provides a rapid and efficient transport mechanism for many technological applications. This spreading process is used, for example, as the carrier mechanism in the casting of biological and organic Langmuir-Blodgett films. We have investigated the dynamics of spontaneously spreading volatile films of different vapor pressures and spreading coefficients advancing over the surface of a deep water support. Laser shadowgraphy was used to visualize the entire surface of the film from the droplet source to the leading edge. This noninvasive technique, which is highly sensitive to the film surface curvature, clearly displays the location of several moving fronts. In this work we focus mainly on the details of the leading edge. Previous studies of the spreading dynamics of nonvolatile, immiscible thin films on a deep liquid layer have shown that the leading edge advances in time as t 3/4 as predicted by laminar boundary layer theory. We have found that the leading edge of volatile, immiscible spreading films also advances as a power law in time, t ␣ , where ␣ϳ1/2. Differences in the liquid vapor pressure or the spreading coefficient seem only to affect the speed of advance but not the value of the spreading exponent, which suggests the presence of a universal scaling law. Sideview laser shadowgraphs depicting the subsurface motion in the water reveal the presence of a single stretched convective roll right beneath the leading edge of the spreading film. This fluid circulation, likely caused by evaporation and subsequent surface cooling of the rapidly spreading film, resembles a propagating Rayleigh-Bénard convective roll. We propose that this sublayer rotational flow provides the additional dissipation responsible for the reduced spreading exponent.

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Section: Introductionmentioning

confidence: 99%

Dynamics of spontaneous spreading with evaporation on a deep fluid layer

Dussaud¹,

Troian²

1998

Physics of Fluids

118

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“…Some time is left for the solvent evaporation and then the compression is started. The influence of the spreading solvent on the monolayer properties is a subject of heated debate [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The interaction of cyclodextrins with phosphatidylethanolamine Langmuir monolayers: Influence of the spreading solvent and subphase conditions

2008

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“…This effect on surfactant morphology is not a contamination issue and is, therefore, not the subject of this work. The interested reader is referred to the work of Gericke, Simon-Kutscher, and Hühnerfuss, 12 which includes a review of the subject.…”

Section: Introductionmentioning

confidence: 99%

Determining liquid substrate cleanliness using infrared imaging

Saylor

2001

Review of Scientific Instruments

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Experiments conducted in a modified Langmuir trough are described. Measurements of surface tension were obtained using a Wilhelmy plate, while infrared (IR) images of the water surface adjacent to the Wilhelmy plate were simultaneously recorded. A contaminating surfactant film was allowed to form on the surface while the experiments were being conducted. The data reveal a substantial change in the IR imagery due to the film in all cases. The difference between the appearance of the clean and surfactant-covered regions of the surface is clear and distinct. For some of these experiments the change in the IR imagery is accompanied by no observable change in surface tension. This, along with several other aspects of this work, suggest that IR imagery may be a superior tool, compared to traditional surface tension measurements, for ascertaining the cleanliness of a liquid substrate.

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Influence of the spreading solvent on the properties of monolayers at the air/water interface

Cited by 48 publications

References 0 publications

Dynamics of spontaneous spreading with evaporation on a deep fluid layer

Dynamics of spontaneous spreading with evaporation on a deep fluid layer

The interaction of cyclodextrins with phosphatidylethanolamine Langmuir monolayers: Influence of the spreading solvent and subphase conditions

Determining liquid substrate cleanliness using infrared imaging

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