Effect of products of PLA2 catalyzed hydrolysis of DLPC on motion of rising bubbles

Krzan, Marcel; Jarek, Ewelina; Warszyński, Piotr; Rogalska, Ewa

doi:10.1016/j.colsurfb.2015.01.046

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…[58][59][60] For a precise determination of the local velocities and the acceleration of the bubbles which detached from the capillary, we have applied a modified setup that was already described previously. 61 In this applied setup, bubbles were generated in a 10 cm high glass column with a 30 mm x 30 mm cross-section that was filled with 30 ml of the solution. Bubbles were formed at controlled time intervals using a high precision peristaltic pump (ISMATEC ISM597D) that was connected to a glass capillary with an inner diameter of 75 µm.…”

Section: Analysis Of Rising Bubblesmentioning

confidence: 99%

“…In general, a certain minimal surfactant coverage is needed for the disappearance of the maximum. This concentration decreases with increasing surface activity of the amphiphile. − For a precise determination of the local velocities and the acceleration of the bubbles which detached from the capillary, we have applied a modified setup that was already described previously . In this applied setup, bubbles were generated in a 10 cm high glass column with a 30 mm × 30 mm cross section that was filled with 30 mL of the solution.…”

Section: Experimental Detailsmentioning

confidence: 99%

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Spiropyran Sulfonates for Photo- and pH-Responsive Air–Water Interfaces and Aqueous Foam

et al. 2020

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Responsive foams and interfaces, are interesting building blocks for active materials that respond and adapt to external stimuli. We have used the photochromic reaction of a spiropyran sulfonate surfactant to render interfacial, rising bubble as well as foaming properties active to light stimuli.In order to address the air-water interface on a molecular level, we have applied sum-frequency generation (SFG) spectroscopy which has provided qualitative information on the surface excess and the interfacial charging state as a function of light irradiation and solution pH. Under blue light irradiation, the surfactant forms a closed ring spiro form (SP), whereas under dark conditions the ring opens and the merocyanine (MC) form is generated. Using SFG spectroscopy, we show that at the interface, different pH conditions of the bulk solution lead to changes in the interfacial charging state. We have exploited the fact that the MC surfactant's O-H group can be deprotonated as a function of pH, and used that to tune the molecules net charge at the interface. In fact, SFG spectroscopy shows that with increasing pH the intensity of the O-H stretching band from interfacial water molecules increases which we associate to an increase in surface net charge. At a pH of 5.3, irradiation with blue light leads to a reversible decrease of O-H intensities, whereas the C-H intensities were unchanged compared to the corresponding intensities under dark conditions. These results are indicative of changes in the surface net charge with light irradiation, which are also expected to influence the foam stability via changes in the electrostatic disjoining pressure. In fact, measurements of the foam stabilities are consistent with this hypothesis with higher foam stability under dark conditions. At pH 2.7 this behavior is reversed as far as the surface tension and surface charging as well as the foam stability are concerned. This is corroborated by rising bubble experiments, which demonstrated an unprecedented reduction of ~30 % in bubble velocity when the bubbles were irradiated with blue light compared to the velocity of bubbles with the

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Section: Analysis Of Rising Bubblesmentioning

confidence: 99%

Section: Experimental Detailsmentioning

confidence: 99%

Spiropyran Sulfonates for Photo- and pH-Responsive Air–Water Interfaces and Aqueous Foam

et al. 2020

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“…As it is known, in a contaminated gas-fluid system, the properties of the gas/liquid interface and the solution of the system affect the bubble’s deformation, velocity, and drag force. Much work has been performed to study the motion of bubbles in contaminated liquids. − A bubble’s deformation, terminal velocity, and diameter decrease rapidly as the concentration of surfactant in the liquid is increased, because an adsorption layer forms at the surfaces of rising bubbles, decreasing the fluidity of the gas/liquid interface and increasing viscous drag. Therefore, the drag coefficient correlations for the contaminated system and pure system should be quite different.…”

Section: Introductionmentioning

confidence: 99%

Drag Coefficient Prediction of a Single Bubble Rising in Liquids

Yan

Zheng

Yan

et al. 2018

Ind. Eng. Chem. Res.

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The motion of single bubbles rising in 2-octanol solutions was investigated experimentally. By using a high-speed video system to follow the rising bubble, the sequences of the recorded frames were digitized and analyzed using image analysis software. The periodical fluctuation of the bubble terminal velocity was observed, which is indicative of a nonconstant bubble drag coefficient. Then, the measured drag coefficient was compared with correlations available in the literature. The comparison shows that these correlations cannot give fully satisfactory results in predicting the fluctuated drag coefficient. Using the extensive experimental data, the authors proposed a new correlation to predict the drag coefficient calculated from the fluctuated motion with the added mass force and history force included. In virtue of nonlinear curve fitting, the drag coefficient of the single bubble is correlated as a function of the Re number, Eo number, We number, and Mo number based on the equivalent bubble diameter. This new model successfully predicts the periodical fluctuations of the drag coefficients. For the standard drag prediction (when averaged terminal velocity is used), this model agrees better with our experimental results and has a maximum relative error of 2.2% and an average relative error of 0.87%. This model is also verified by bubble rising in methyl isobutyl carbinol cas (MIBC) and OP-10 (C 32 H 58 O 10 ) aqueous solutions, and the errors are similar to that of 2-octanol solutions. On the basis of a comparison with measurements in other liquids from the literature, this new correlation represents well the experimental data which covers 21 pure liquids and contaminated liquids in a very wide range of parameters as follows: 10 −3 ≤ Re ≤ 10 5 , 10 −2 ≤ Eo ≤ 10 3 , and 10 −14 ≤ Mo ≤ 10 7 . This work is an extension of our previous one (Yan et al. Chem. Eng. J. 2017, 316, 553) in which the old correlation predicts the fluctuated drag coefficient for bubble rising in pure water.

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Effect of Adsorption Dynamics on Hydrodynamic Characteristics of a Bubble Contaminated by Surfactants at Medium Reynolds Numbers

Wang

Pang²,

Lv³

2022

Microgravity Sci. Technol.

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Effect of products of PLA2 catalyzed hydrolysis of DLPC on motion of rising bubbles

Cited by 6 publications

References 34 publications

Spiropyran Sulfonates for Photo- and pH-Responsive Air–Water Interfaces and Aqueous Foam

Spiropyran Sulfonates for Photo- and pH-Responsive Air–Water Interfaces and Aqueous Foam

Drag Coefficient Prediction of a Single Bubble Rising in Liquids

Effect of Adsorption Dynamics on Hydrodynamic Characteristics of a Bubble Contaminated by Surfactants at Medium Reynolds Numbers

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