Coalescence of Air Bubbles in Surfactant Solutions: Role of Salts Containing Mono-, Di-, and Trivalent Ions

Giribabu, K.; Reddy, M.L.N.; Ghosh, Pallab

doi:10.1080/00986440701555316

Cited by 33 publications

(40 citation statements)

References 23 publications

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“…It can be observed from this figure that the concentration of the surfactant at which the interfacial tension became almost invariant with surfactant concentration (i.e., the CMC) varied over a wide range for these surfactants. The CMCs for SDS, CTAB and Tween 20 are close to the corresponding values for the air Àwater system reported in the literature (Giribabu and Ghosh, 2007;Giribabu et al, 2008).…”

Section: Resultssupporting

confidence: 86%

Adsorption and coalescence in mixed surfactant systems: Water−hydrocarbon interface

Reddy

Ghosh

2010

Chemical Engineering Science

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Section: Resultssupporting

confidence: 86%

Adsorption and coalescence in mixed surfactant systems: Water−hydrocarbon interface

Reddy

Ghosh

2010

Chemical Engineering Science

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“…Then we tried to decrease the rest time of bubbles by adding low concentration of salt. 26,30 Movie S1 † clearly demonstrated the continuous oating and sinking of Au-GCB-Pt in the mixture solution of H 2 O 2 , SDS, and low concentration of Na 2 SO 4 . Fig.…”

Section: Locomotion Of Au-gcb-pt In Fuel Solutionmentioning

confidence: 97%

Buoyant force-induced continuous floating and sinking of Janus micromotors

Koizumi

Nishiyama

et al. 2018

RSC Adv.

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“…9,59 The ionic strength of the solution : 1 = 2 P i z 2 i c i À Á is an important parameter in quantifying the effect of salt in terms of the valence and concentration of its ions. For example, Giribabu et al 9 found that MgCl 2 showed stronger effect than NaCl, and AlCl 3 was even more effective. A very small amount AlCl 3 was sufficient for the surfactant (CTAB) to saturate the air/water interface.…”

Section: Adsorption Of Surfactantsmentioning

confidence: 99%

“…With increasing concentration of the salt, the electrostatic repulsive force decreases due to the presence of a 15 Effect of concentration of Span 80 on binary coalescence time of air bubbles in ethylene glycol 11 16 Effect of concentration of ethyl alcohol on coalescence time of air bubbles at flat air/water interface 5 5 Kumar and Ghosh, 7 Giribabu et al 9 and Bommaganti et al 10 In presence of certain surfactants and salts (e.g. SDS and LiCl, or CTAB and NaBr), the bubble does not coalesce at all.…”

Section: Effect Of Electrolyte In Presence Of Ionic Surfactantsmentioning

confidence: 99%

“…3 The coalescence time of a single air bubble at a flat air/water interface has been studied by several workers. [4][5][6][7][8][9][10] This method has the advantage that it is very easy to perform experimentally and long coalescence times can be studied by this method. Recently, Giribabu and Ghosh 11 developed an experimental technique for studying long binary coalescence times.…”

Section: Introductionmentioning

confidence: 99%

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Coalescence of bubbles in liquid

Ghosh¹

2009

Bubble Science, Engineering & Technology

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Coalescence of bubbles is important for the destabilisation of gas-liquid dispersions. The theories of coalescence used at present are reviewed. The film drainage theory and the stochastic theory of coalescence have been discussed with their merits and drawbacks. The influence of van der Waals, electrostatic double layer, steric and solvation forces on the coalescence process has been discussed. The importance of adsorption of surfactant molecules at the air/water interface in presence and in absence of salt on coalescence time has been explained. Difference between the experimental conditions under which the foam films collapse and the bubble coalescence experiments has been pointed out. Possible reasons behind the failure of the film drainage models in predicting the coalescence time have been explained. Some directions for future research have also been discussed. List of symbolsa bubble radius, m a f area of the film, m 2 A surface area, m 2 A H Hamaker constant, J A min minimum surface area per adsorbed surfactant molecule, m 2 B modified Hamaker constant, J m c concentration of surfactant in the bulk solution, mol m 23 c s concentration of salt in the bulk solution, mol m 23 c ? i concentration of ions of type i in the bulk solution, mol m 23 C 1 ,C 2 constants in equation (14), N m 21 D C surface diffusivity, m 2 s 21 e electronic charge, C f r repulsive force generated by one mole of the surfactant at the barrier ring, N mol 21 F(t R ) cumulative probability distribution of coalescence time F h hydration force, N g acceleration due to gravity, m s 22 h film thickness, m h c critical film thickness, m k Boltzmann's constant, J K 21 K L equilibrium constant in Langmuir isotherm, m 3 mol 21 l length of a polymer segment, m L thickness of the polymer brush layer, m n ' number of ions per unit volume in the bulk solution, m 23 n s number of segments of the polymer molecule N total number of ruptured films N A Avogadro's number, mol 21 p pressure, Pa P C dimensionless coalescence threshold R gas constant, J mol 21 K 21 R b radius of barrier ring, m R m radius of curved surface, m s mean distance between the attachment points, m S C normalised standard deviation t time, s t c coalescence time, s t characteristic diffusion time, s T temperature, K w b width of the barrier ring, m z valence a fraction of C that remains at the barrier ring after the displacement of the surfactant molecules to the barrier ring c surface tension, N m 21 C surface excess, mol m 22 C mean value of the distribution of surface excess C, mol m 22 C number of adsorbed chains per unit area, m 22 C ' adsorption capacity, mol m 22 C m minimum value of the surfactant concentration at the barrier ring required to prevent coalescence, mol m 22 d separation between the surfaces, m Dp excess pressure in the film, Pa Dr density difference between the two phases, kg m 23 e dielectric constant of the medium e 0 permittivity of free space, C 2 J 21 m 21 k Debye-Hü ckel parameter, m 21 l i zeros of the Bessel function of the first kind and order one J ...

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Coalescence of Air Bubbles in Surfactant Solutions: Role of Salts Containing Mono-, Di-, and Trivalent Ions

Cited by 33 publications

References 23 publications

Adsorption and coalescence in mixed surfactant systems: Water−hydrocarbon interface

Adsorption and coalescence in mixed surfactant systems: Water−hydrocarbon interface

Buoyant force-induced continuous floating and sinking of Janus micromotors

Coalescence of bubbles in liquid

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