Role of anionic surfactant in the generation of bulk nanobubbles by ultrasonication

Lee, Jeong Il; Kim, Jong Min

doi:10.1016/j.colcom.2021.100578

Cited by 9 publications

(11 citation statements)

References 24 publications

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“…65 Due to the differing orientations of the polar and nonpolar groups of a surfactant, an EDL forms at the gas−liquid interface. 32 CTAB possesses a positively charged hydrophilic head, CTA + , and a neutral hydrophobic tail. There is a surfactant layer at the gas−liquid interface with a neutral hydrophobic tail oriented toward the gas phase and a positively charged hydrophilic head, CTA + on the surface, as shown in Figure 3b.…”

Section: Resultsmentioning

confidence: 99%

“…The nonpolar group is oriented toward the air phase during the adsorption of surfactant molecules, whereas the polar group is oriented toward the water . Due to the differing orientations of the polar and nonpolar groups of a surfactant, an EDL forms at the gas–liquid interface . CTAB possesses a positively charged hydrophilic head, CTA + , and a neutral hydrophobic tail.…”

Section: Resultsmentioning

confidence: 99%

“…The c nb result in the presence of SDS (concentration up to CMC) is consistent with the result of another researcher. 32 The observed c nb ranges from 2.94 × 10 8 to 3.38 × 10 8 NBs/mL (in the c s = 2.46−7.38 mM). The increase in the c nb is about 14.97% when the surfactant concentration increases from 2.46 to 7.38 mM.…”

Section: Bubble Size Distribution and Correspondingmentioning

confidence: 95%

“…The increase in the negative magnitude of ζ below the CMC of SDS is consistent with the findings of other investigators. 32,76 However, the 5a. The average NB diameter in an acidic medium (pH < 7) is larger compared to the neutral medium (pH = 7).…”

Section: ζ-Potential Of Nbsmentioning

confidence: 99%

“…Surfactants play an influential role in the nucleation, physicochemical properties, and stability of NBs. Lee and Kim investigated the NBs concentration and diameter in the sodium dodecyl sulfate (SDS) solution. They elucidated a high bubble concentration and small NBs in the surfactant solution.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Cavitation Bulk Nanobubbles Characteristics: Effects of pH and Surface-Active Agents

et al. 2023

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Nanobubbles (NBs) have a widespread application in antimicrobial activity, wastewater treatment, and ecological restoration due to numerous peculiar characteristics, such as small diameter, long-term stability, and ability to produce hydroxyl radicals. Despite significant applications, only limited comprehensive investigations are available on the role of surfactants and pH in NBs characteristics. Therefore, this study examines the effects of different surfactants (i.e., anionic, cationic, and nonionic) and pH medium on bulk NB formation, diameter, concentration, bubble size distribution (BSD), ζ-potential, and stability. The effect of surfactant at concentrations above and below the critical micelle concentration was investigated. NBs were generated in deionized (DI) water using a piezoelectric transducer. The stability of NBs was assessed by tracking the variation in diameter and concentration over time. In a neutral medium, the diameter of NBs is smaller than in other surfactant or pH mediums. The diameter, concentration, BSD, and stability of NBs are strongly influenced by the ζ-potential rather than the solution medium. BSD curve shifts to a smaller bubble diameter when the magnitude of ζ-potential is high in any solution. In pure water, surfactant, and pH mediums, NBs have existed for a long time. NBs have a shorter life span in environments with a pH ≤ 3. Surfactant adsorption on the surface of NBs increases with increasing surfactant concentration up to a certain limit, beyond which it declines substantially. The Derjaguin–Landau–Verwey–Overbeek (DLVO) theory was used to interpret the NBs stability, resulting in a total potential energy barrier that is positive and greater than 45.55 k B T for 6 ≤ pH ≤ 11, whereas for pH < 6, the potential energy barrier essentially vanishes. Moreover, an effort has also been made to explicate the plausible prospect of ion distribution and its alignment surrounding NBs in cationic and anionic surfactants. This study will extend the in-depth investigation of NBs for industrial applications involving NBs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Bubble Size Distribution and Correspondingmentioning

confidence: 95%

Section: ζ-Potential Of Nbsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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