Mapping of the Marangoni effect in soap films using Young's double-slit experiment

Émile, Janine; Émile, Olivier

doi:10.1209/0295-5075/104/14001

Cited by 4 publications

(7 citation statements)

References 41 publications

(63 reference statements)

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“…A vertical free standing draining soap film supported by a glass frame experiences a modulated radiation pressure force from a chopped green solid state laser also called "modulated laser" in the following (Cristal Laser, P = 100 mW, attenuated to P = 2 mW, waist w = 300 µm, λ = 532 nm). Although much more accurate techniques exist to measure thin film thickness variations [17], we use the interference fringes in transmission from two continuous wave (CW) low power He-Ne lasers (Mlles Griot, P = 1 mW, w = 400 µm, λ = 633 nm and λ = 543 nm respectively), in order to measure the absolute film thickness [18]. These lasers will be called "probe beams" in the following.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Thus, the influence of the two low power CW probe beams on the film dynamics could be neglected. The modulated beam was attenuated below 2 mW in order to avoid any deformation of the film interfaces due to higher laser power such as thermal or Marangoni effects [17,19].…”

Section: Experimental Set-upmentioning

confidence: 99%

“…In order to get some more physical insights, one can try to modify the film stiffness. For example, above the CMC, the film structure is changed by miscellar stratification [17]. The film should be stiffer.…”

Section: Resonancementioning

confidence: 99%

“…The modulated beam was attenuated below 2 mW in order to avoid any deformation of the film interfaces due to higher laser power such as thermal or Marangoni effects. 17,19 The glass frame supporting the film is a 3 cm diameter toroidal ring. The glass rod diameter is 5 mm.…”

Section: Experimental Set-upmentioning

confidence: 99%

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Laser-induced vibration of a thin soap film

Émile

2014

Lab Chip

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We report on the vibration of a thin soap film based on the optical radiation pressure force. The modulated low power laser induces a counter gravity flow in a vertical free-standing draining film. The thickness of the soap film is then higher in the upper region than in the lower region of the film. Moreover, the lifetime of the film is dramatically increased by a factor of 2. Since the laser beam only acts mechanically on the film interfaces, such a film can be employed in an optofluidic diaphragm pump, the interfaces behaving like a vibrating membrane and the liquid in-between being the fluid to be pumped. Such a pump could then be used in delicate micro-equipment, in chips where temperature variations are detrimental and even in biological systems.

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Section: Experimental Set-upmentioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Resonancementioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

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Laser-induced vibration of a thin soap film

Émile

2014

Lab Chip

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“…This would be the case, for instance, for perturbations involving surface tension gradients (Emile & Emile 2013), since a locally smaller surface tension, on the one hand, tends to decrease the receding velocity of a hole but, on the other hand, drives a local thinning of the curtain which tends to increase the receding velocity. radius from the sheet.…”

Section: Resultsmentioning

confidence: 99%

Blowing a liquid curtain

2016

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International audienceWe study the response of a steady free-falling liquid curtain perturbed by focused air jets blowing perpendicularly against it. Asymmetric and symmetric perturbations are applied by using either a single pulsed jet or two identical steady jets facing each other. The response strongly depends on the curtain flow rate, and the location and strength of the perturbation. For pulsed asymmetric perturbations of increasing amplitude, sinuous wave, drop ejection, bubble ejection and hole opening are successively observed. For steady symmetric perturbations, a steady hole forms downstream in the wake. For this latter case, we present a model for the curtain thickness and the location of the hole in the wake in terms of the curtain flow rate and the size, flow rate and location of the jets. The adjustable-parameter-free expression we obtain compares favourably to the experiments provided that the perturbation is sufficiently small (jet stagnation pressure smaller than curtain stagnation pressure) and the liquid viscosity is negligible

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Calibration of absorption coefficients of liquid solutions for measuring liquid film thickness by absorptiometry

Zhao,

2024

Meas. Sci. Technol.

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Infrared absorptiometry is a widely used non-intrusive method for measuring the thickness of liquid films. The accuracy of that measurement depends crucially on having high-accuracy data of the absorption coefficient of the laser light used, which is, however, not easily available, especially for the wavelength range where the absorption is strong. Here we propose a method to calibrate the absorption coefficients in such cases. By measuring the light intensity reduction while scanning through a liquid film formed in a wedge, whose angle can be adjusted and determined a priori from interferometry, the absorption coefficient of the liquid can be accurately obtained without the need to create a flat liquid film with exact known thickness. The method is verified by calibrating the absorption coefficient of pure water at an infrared wavelength and the result agrees very well with the values found in the literature. As a demonstration of the application of the method, the absorption coefficients of soap solutions with different compositions were calibrated and used to measure the thicknesses of draining soap films. The results from the absorptiometry are in good agreement with the film thickness measured simultaneously from interferometry.

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Mapping of the Marangoni effect in soap films using Young's double-slit experiment

Cited by 4 publications

References 41 publications

Laser-induced vibration of a thin soap film

Laser-induced vibration of a thin soap film

Blowing a liquid curtain

Calibration of absorption coefficients of liquid solutions for measuring liquid film thickness by absorptiometry

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