Effect of dissolved-gas concentration on bulk nanobubbles generation using ultrasonication

Lee, Jeong Il; Yim, Byung-Seung; Kim, Jong Min

doi:10.1038/s41598-020-75818-8

Cited by 28 publications

(15 citation statements)

References 40 publications

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“…Regarding the solutal contribution, we take into account the main components of the reactive system: (i) The presence of H 2 O 2 slightly increases the surface tension of the solution in relation to pure water (73.7 mNm −1 for H 2 O 2 28% at 18 °C) 56 , however the compound is consumed by the reaction. (ii) The presence of dissolved oxygen decreases the surface tension of water (68 mNm −1 for 45 ppm at 20 °C) 57 , and the effect is stronger under supersaturated conditions 58 . In contrast, the surface tension of KI solution is slightly larger than that of water ( γ K ≈ 74 mN m −1 for KI 1 M at 20 °C) 59 , and it may further increase in the annulus due to evaporation-induced concentration.…”

Section: Resultsmentioning

confidence: 99%

Droplets in underlying chemical communication recreate cell interaction behaviors

2022

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The sensory-motor interaction is a hallmark of living systems. However, developing inanimate systems with “recognize and attack” abilities remains challenging. On the other hand, controlling the inter-droplet dynamics on surfaces is key in microengineering and biomedical applications. We show here that a pair of droplets can become intelligently interactive (chemospecific stimulus-response inter-droplet autonomous operation) when placed on a nanoporous thin film surface. We find an attacker-victim-like non-reciprocal interaction between spatially separated droplets leading to an only-in-one shape instability that triggers a drop projection to selectively couple, resembling cellular phenomenologies such as pseudopod emission and phagocytic-like functions. The nanopore-driven underlying communication and associated chemical activity are the main physical ingredients behind the observed behavior. Our results reveal that basic features found in many living cell types can emerge from a simple two-droplet framework. This work is a promising step towards the design of microfluidic smart robotics and for origin-of-life protocell models.

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Section: Resultsmentioning

confidence: 99%

Droplets in underlying chemical communication recreate cell interaction behaviors

2022

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“…Besides, the volumetric bubble concentration was 8.3 × 10 6 /mL when using SDS as surfactant while it was 2.5 × 10 7 /mL when using L-150 A. Lee et al (2020) studied the effect of dissolved gas concentration on NB generation by ultrasonic irradiation. They used an ultrasonic horn booster at 20 kHz to irradiate the ultrasound for 10 min in three types of DI water, namely undersaturated, saturated, and supersaturated.…”

Section: Porous Membranementioning

confidence: 99%

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

et al. 2022

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Gas flotation for oily wastewater treatment is based on the attachment of gas bubbles to oil droplets to produce lighter aggregates that rise to the wastewater surface. It is a feasible, promising, and effective method for oily wastewater treatment due to its high separation efficiency with no secondary contamination, cost-effectiveness, and simple operation. This review focuses on separating oil from emulsions by gas flotation using microbubbles and nanobubbles which offer the advantages of small bubble size, large specific surface area, and slow rising velocity. The properties of different types of gas bubbles and their generation methods were discussed. Different gas flotation system designs and operational parameters were summarized for dissolved gas flotation, induced gas flotation, and electrolytic flotation. The review illustrated that oil removal efficiency in microbubble and nanobubble-based gas flotation was affected by various factors including initial oil concentration, pH, temperature, flotation time, and oil droplet size.

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“…Concerning the nature of the interacting impurities, several hypotheses can be considered: The impurities could be gaseous bubbles already present in the solution before irradiation, even in the case of degassed solution (a recent study from Lee et al [38] estimates that the number of gas bubbles in degassed deionized water is of circa 4 × 10 7 per mL with a mean diameter of circa 250 nm). However, the absorption coefficient of gases at 1064 nm was very low, and it was unlikely that light absorption by the gaseous bubble could induce sufficient local heating of the solution.…”

Section: Influence Of Gas Composition and Naturementioning

confidence: 99%

Potassium Sulfate: A New Candidate to Explore Non-Photochemical Laser-Induced Nucleation Mechanisms

et al. 2021

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In this paper, we report a study on the nucleation behavior of potassium sulfate (K2SO4) from aqueous solutions under the influence of unfocused nanosecond laser pulses. The objective is to contribute to the general understanding of the Non-Photochemical Laser-Induced Nucleation (NPLIN) mechanism. First, the influence of several parameters such as supersaturation as well as laser parameters (pulse energy, number of pulses, and laser polarization) on induction time, probability of nucleation and mean number of crystals in comparison with spontaneous nucleation was investigated. Then, we examined the influence of gas composition (i.e., degassing and gas bubbling (CO2 and N2)) of the supersaturated solutions on the NPLIN kinetics, showing no correlation between gas content (or nature) on the crystallization behavior. Our study questions the role of impurities within the solution regarding the mechanism of laser-induced nucleation.

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Effect of dissolved-gas concentration on bulk nanobubbles generation using ultrasonication

Cited by 28 publications

References 40 publications

Droplets in underlying chemical communication recreate cell interaction behaviors

Droplets in underlying chemical communication recreate cell interaction behaviors

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

Potassium Sulfate: A New Candidate to Explore Non-Photochemical Laser-Induced Nucleation Mechanisms

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