On Nanobubble Dynamics under an Oscillating Pressure Field during Salting-out Effects and Its DLVO Potential

Agarwal, Kalyani; Trivedi, Mohit; Ohl, Claus‐Dieter; Nirmalkar, Neelkanth

doi:10.1021/acs.langmuir.2c03085

Cited by 13 publications

(12 citation statements)

References 51 publications

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“…However, in our previous study, we proposed a single nanobubble stability model in which stability was shown for nanobubbles in pure water and in salt (mono, di, and trivalent salts) solutions. 36 Here, we considered the force balance around a single nanobubble to predict the equilibrium size of a nanobubble in pure alcohols. The force balance model around a single nanobubble may be helpful in predicting the stability of a swarm of nanobubbles.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…It can also be speculated that a single nanobubble may not exist, but a swarm of nanobubbles exists due to the mutual repulsion from the surrounding negatively charged nanobubbles. However, in our previous study, we proposed a single nanobubble stability model in which stability was shown for nanobubbles in pure water and in salt (mono, di, and trivalent salts) solutions . Here, we considered the force balance around a single nanobubble to predict the equilibrium size of a nanobubble in pure alcohols.…”

Section: Resultsmentioning

confidence: 99%

“…The reciprocating motion of the plunger generates the oscillating pressure field in the sample (−30 to +30 kPa). 36 The gas solubility reduces under subatmospheric pressure, and the additional gas nucleates as nanobubbles. 43 The RPM (rotation per minute) of the motor is fixed at 40, and nanobubble generation in each alcohol was analyzed for 400, 800, and 1200 cycles for 10, 20, and 30 min, respectively.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…Ten mL of alcohol was placed in a U-tube that was connected to the syringe. The reciprocating motion of the plunger generates the oscillating pressure field in the sample (−30 to +30 kPa) . The gas solubility reduces under subatmospheric pressure, and the additional gas nucleates as nanobubbles .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The results on the effect of alcohol type, the influence of ultrasound power and amplitude, and the effect of compression−decompression cycles were extensively discussed. A mechanical stability model 36 is employed to describe the experimental trends observed in the experiments in this work. The measured surface charge and mean diameter predict the colloidal stability of the nanobubbles in pure alcohols.…”

Section: ■ Introductionmentioning

confidence: 99%

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Do Nanobubbles Exist in Pure Alcohol?

Sharma,

Trivedi,

Nirmalkar

2024

Langmuir

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The existence of nanobubbles in pure water has been extensively debated in recent years, and it is speculated that nanobubbles may be ion-stabilized. However, nanobubbles in the alcohol−water mixture and pure alcohols are still controversial due to the lack of ions present in the alcohol system. This work tested the hypothesis that stable nanobubbles exist in pure alcohol. The ultrasound and oscillatory pressure fields are used to generate nanobubbles in pure alcohol. The size distribution, concentration, diameter, and scattering intensity of the nanobubbles were measured by nanoparticle tracking analysis. The light scattering method measures the zeta potential. The Mie scattering theory and electromagnetic wave simulation are utilized to estimate the refractive index (RI) of nanobubbles from the experimentally measured scattering light intensity. The average RI of the nanobubbles in pure alcohols produced by ultrasound and oscillating pressure fields was estimated to be 1.17 ± 0.03. Degassing the nanobubble sample reduces its concentration and increases its size. The average zeta potential of the nanobubbles in pure alcohol was measured to be −5 ± 0.9 mV. The mechanical stability model, which depends on force balance around a single nanobubble, also predicts the presence of nanobubbles in pure alcohol. The nanobubbles in higher-order alcohols were found to be marginally colloidally stable. In summary, both experimental and theoretical results suggest the existence of nanobubbles in pure alcohol.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Do Nanobubbles Exist in Pure Alcohol?

Sharma,

Trivedi,

Nirmalkar

2024

Langmuir

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Colloidal Zeta Potential Modulation as a Handle to Control the Crystallization Kinetics of Tin Halide Perovskites for Photovoltaic Applications

Wang,

Huang,

Abdel‐Shakour

et al. 2024

Angewandte Chemie

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Tin halide perovskites (THPs) have demonstrated exceptional potential for various applications owing to their low toxicity and excellent optoelectronic properties. However, the crystallization kinetics of THPs are less controllable than its lead counterpart because of the higher Lewis acidity of Sn2+, leading to THP films with poor morphology and rampant defects. Here, a colloidal zeta potential modulation approach is developed to improve the crystallization kinetics of THP films inspired by the classical Derjaguin‐Landau‐Verwey‐Overbeek (DLVO) theory. After adding 3‐aminopyrrolidine dihydro iodate (APDI2) in the precursor solution to change the zeta potential of the pristine colloids, the total interaction potential energy between colloidal particles with APDI2 could be controllably reduced, resulting in a higher coagulation probability and a lower critical nuclei concentration. In‐situ laser light scattering measurements confirmed the increased nucleation rate of the THP colloids with APDI2. The resulting film with APDI2 shows a pinhole‐free morphology with fewer defects, achieving an impressive efficiency of 15.13%.

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