The development of Marangoni convection induced by local addition of a surfactant

Birikh, Rudolph; Denisova, M. O.; Kostarev, K. G.

doi:10.1134/s0015462811060068

Cited by 13 publications

(8 citation statements)

References 9 publications

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“…The capillary motion arises with a discernable delay (Δt ∼ 0.6 s) as compared with the moment at which the jet visually touches the interfacial boundary [3]. In this time the surfactant not only reaches the interface but even in part diffuses across it.…”

Section: Results Of the Experimentsmentioning

confidence: 99%

“…If the admixture adsorption rate is lower for one liquid (donor) than the desorption rate for the other (recipient), we can anticipate a substantial decrease in the surface admixture concentration at the interface as compared with the case of equilibrium admixture distribution observed at the free surface. We can use this fact for, for example, decrease in the surface tension threshold drop necessary for Marangoni convection onset [3]. It is the checking of this hypothesis that has become the main problem for the experimental part of the present study.…”

mentioning

confidence: 79%

“…Depending on its density, the surfactant was solved in one of the contacting liquids, so that the surfactant solution drop introduced from the side of this liquid moved toward the interface under the action of the Archimedean force. As shown in [3,6], the concentration of uncontrolled surfactant admixtures is predetermined by their purification efficiency and the quality of preparation of the cuvette whose walls may be covered by the film of poorly soluble substances. In view of this, after each set of experiments the cuvette was (a) mechanically cleaned several times using a "Fairy" detergent; (b) placed under running water for an hour; and (c) washed by a liter of distilled water.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…Since the surface tension of the liquid interface σ depends on the surface surfactant concentration Γ by the law σ = σ 0 − σ 1 Γ, the inhomogeneous surfactant distribution may produce Marangoni convection. For the upper layer formed by a passive gas which does not affect the motion in the lower layer, the development of the gravity and Marangoni convection in such a system was considered earlier in [3].…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Recent investigations have obviously shown that the pattern and intensity of capillary motion depend on both the spatial distribution and value of the surface tension drop created and the properties of the liquid surface [1][2][3]. In their turn, the properties of the surface are determined not by the liquid nature alone but also by the composition and concentration of the admixtures adsorbed by the surface from the liquid bulk and the contacting medium.…”

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confidence: 99%

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Development of concentration-capillary convection on an interfacial surface

2015

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The onset of Marangoni convection initiated by introducing a surfactant solution drop onto a horizontal liquid interface is studied experimentally and theoretically. It is revealed that the film of admixtures adsorbed by this surface from the bulk of the contacting liquids begins to move only as a certain shear stress is reached, that is, the capillary flow development is of threshold nature. If compared with Marangoni convection development on the free liquid surface, the threshold shear stress may turn out to be either lower or higher, depending on the surfactant admixture concentration in both liquids and the pattern of changes in the surface tension with approaching the interfacial surface. In order to describe the threshold development of concentration convection, a nonlinear dependence of the shear stress at the liquid surface on the liquid velocity is proposed. In a numerical experiment, the convective flow pattern on the interface is determined and the time dependence of the flow intensity is obtained.

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Section: Results Of the Experimentsmentioning

confidence: 99%

mentioning

confidence: 79%

Section: Experimental Techniquesmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

mentioning

confidence: 99%

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Development of concentration-capillary convection on an interfacial surface

2015

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Uniaxial‐Oriented Chiral Perovskite for Flexible Full‐Stokes Polarimeter

Chen,

Ding,

Zhang

et al. 2024

Advanced Materials

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Full‐Stokes polarization detection, with high integration and portability, offers an efficient path toward next‐gen multi‐information optoelectronic systems. Nevertheless, current techniques relying on optical filters create rigid and bulky configurations, limiting practicality. Here, we first report a flexible, filter‐less full‐Stokes polarimeter featuring a uniaxial‐oriented chiral perovskite film. We find that, the strategic manipulation of the surfactant‐mediated Marangoni effect during blade coating, is crucial for guiding an equilibrious mass transport to achieve oriented crystallization. Through this approach, the obtained uniaxial‐oriented chiral perovskite films inherently possess anisotropy and chirality, and thereby with desired sensitivity to both Linearly Polarized Light (LPL) and Circularly Polarized Light (CPL) vectors. The uniaxial‐oriented crystalline structure also improves photodetection, achieving a specific detectivity of 5.23 × 1013 Jones, surpassing non‐oriented devices by 10x. The as‐fabricated flexible polarimeters enable accurate capture of full‐Stokes polarization without optical filters, exhibiting slight detection errors for the Stokes parameters: ΔS1 = 9.2%, ΔS2 = 8.6%, and ΔS3 = 6.5%, approaching the detection accuracy of optics‐filter polarimeters. Our proof of concept also demonstrates applications in matrix polarization imaging.This article is protected by copyright. All rights reserved

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