Generation methods, stability, detection techniques, and applications of bulk nanobubbles in agro-food industries: a review and future perspective

Babu, Karthik Sajith; Amamcharla, Jayendra

doi:10.1080/10408398.2022.2067119

Cited by 17 publications

(12 citation statements)

References 149 publications

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“…However, many experimental data showed that UFBs existed in water for several days to weeks. 10 This large discrepancy is mainly due to the Laplace pressure. One of the theories claims that OH − ions ranged on the bubble surface induce a repulsion pressure against the Laplace pressure and UFBs formed by contracting MBs could achieve a pressure that can counteract the Laplace pressure.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Because of the underlying physics, the stability of UFBs is still controversial, and it is also a mystery that the size of stable UFBs is mostly in the range of 100−200 nm. 10,11 Although the study of these physical properties is still continuing, FBs as gas carriers have been attracting attention in recent years and are summarized in reviews of topical oxygen therapy and water treatment. 12−14 FB aeration is known as a superior method to macrobubble aeration for increasing oxygen levels in unoxygenated liquid and applied for water treatments, 14 chemical reactions, 15 and blood oxygenation.…”

Section: ■ Introductionmentioning

confidence: 99%

“…As for the negative charge, it is known that OH – ions are oriented at the gas–liquid interface providing the negative surface charge. , However, applying the Young–Laplace equation, it is suggested that a UFB has a high internal pressure (the Laplace pressure, 100 nm ≈ 30 atm) and cannot exist for a long time. Because of the underlying physics, the stability of UFBs is still controversial, and it is also a mystery that the size of stable UFBs is mostly in the range of 100–200 nm. , Although the study of these physical properties is still continuing, FBs as gas carriers have been attracting attention in recent years and are summarized in reviews of topical oxygen therapy and water treatment. − …”

Section: Introductionmentioning

confidence: 99%

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Do Ultrafine Bubbles Work as Oxygen Carriers?

et al. 2023

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Fine bubbles (FBs) are bubbles with sizes less than 100 μm and are divided into ultrafine bubbles (UFBs, < 1 μm) and microbubbles (MBs, 1−100 μm) depending on their size. Although FB aeration is known as a more efficient way than macrobubble aeration to increase the oxygen level in unoxygenated water, few reports have demonstrated whether dispersed UFBs work as oxygen carriers or not. Furthermore, oxygen supersaturation is one of the attractive characteristics of FB dispersion, but the reason is yet to be revealed. In this study, we evaluated the relationship between the FBs, especially UFB concentration, and oxygen content in several situations to reveal the two questions. The FB concentration and oxygen content were examined using particle analyzers and our developed oxygen measurement method, which can measure the oxygen content in FB dispersion, respectively. First, in the evaluations of the oxygen dispersion from UFBs with respect to the surrounding oxygen level, UFBs did become neither small nor diminish even in degassed water. Second, the changes in UFBs and oxygen content upon storage temperature and the existence of a lid during storage were evaluated, and there was no correlation between them. It means UFBs contribute little to the oxygen content in UFB dispersion. Furthermore, the oxygen content in the UFB dispersion decreased over time identically as that of the oxygen-supersaturated water with little UFBs. Third, we evaluated the relationship between FB concentration and oxygen content during FB generation by measuring them simultaneously. The results showed that dispersed MB and UFB concentrations did not account for the supersaturation of the FB dispersion. From the result, it was revealed that 100−200 nm of UFBs themselves did not work as oxygen carriers, and the oxygen supersaturation in FB dispersions was due to the supersaturated state of dissolved oxygen that was prepared during the FB generation process.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Do Ultrafine Bubbles Work as Oxygen Carriers?

et al. 2023

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“…According to Epstein and Plesset’s theory, the lifetime of a bubble is expressed as t f = R 2 ρ g 2 C s false( 1 − f false) where t f , R , ρ g , C s , and f represent the lifetime of the bubble, radius of the bubble, density of the gas bubble, saturation concentration, and gas saturation ratio, respectively. For nanobubbles, the lifetime is on the order of microseconds (for ∼100–200-nm-diameter bubbles dispersed in water, t f = 20–80 μs), considering that Henry’s law and the Young–Laplace equation are valid at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Augmenting the Leidenfrost Temperature of Droplets via Nanobubble Dispersion

et al. 2022

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Droplets may rebound/levitate when deposited over a hot substrate (beyond a critical temperature) due to the formation of a stable vapor microcushion between the droplet and the substrate. This is known as the Leidenfrost phenomenon. In this article, we experimentally allow droplets to impact the hot surface with a certain velocity, and the temperature at which droplets show the onset of rebound with minimal spraying is known as the dynamic Leidenfrost temperature (T DL ). Here we propose and validate a novel paradigm of augmenting the T DL by employing droplets with stable nanobubbles dispersed in the fluid. In this first-of-itskind report, we show that the T DL can be delayed significantly by the aid of nanobubble-dispersed droplets. We explore the influence of the impact Weber number (We), the Ohnesorge number (Oh), and the role of nanobubble concentration on the T DL . At a fixed impact velocity, the T DL was noted to increase with the increase in nanobubble concentration and decrease with an increase in impact velocity for a particular nanobubble concentration. Finally, we elucidated the overall boiling behaviors of nanobubble-dispersed fluid droplets with the substrate temperature in the range of 150− 400 °C against varied impact We through a detailed phase map. These findings may be useful for further exploration of the use of nanobubble-dispersed fluids in high heat flux and high-temperature-related problems and devices.

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“…Micro- and nano-bubbles offer substantial improvements in applications such as wastewater treatment, mining, agriculture, food processing, and medicine ( Liu et al, 2008 ; Amamcharla et al, 2017 ; Temesgen et al, 2017 ; Jannesari et al, 2020 ). Recently, the potential applications of nano-bubbles in food and dairy processing industries have been thoroughly reviewed ( Thi Phan et al, 2020 ; Babu and Amamcharla, 2022b ; Zhang et al, 2022 ). Ebina et al (2013) noted a significant increase in O 2 content in water (7.7 to 31.7 mg/L) when incorporated as O 2 MNB.…”

mentioning

confidence: 99%

Influence of micro- and nano-bubble treatment on morphological characteristics and flow properties of spray-dried milk protein concentrate powders

Babu

Siliveru²,

Amamcharla³

2022

JDS Communications

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Milk protein concentrate (MPC) is an ideal dairy ingredient to provide nutritional and functional benefits in highprotein dairy and food products. However, it is also a challenge for the end-user to incorporate MPC powders in a formulation due to their deprived bulk handling properties. Therefore, simple and innovative strategies to improving final physical powder properties are of critical consideration for the dairy industry. In the present work, we are exploring the possibility of utilizing micro-and nano-bubbles for improving morphological characteristics and flow properties of spray-dried MPC powders. Micro-and nano-bubble (MNB) incorporation exhibited lower particle size and had better flowability. The differences in particle structure and shape appear to have a large impact on its physical characteristics and will likely also influence the rehydration properties. Highlights • Treatment with MNB was used to improve MPC powder flowability. • Basic flowability energy values of MPC powders decreased with MNB injection. • Control MPC powders were more cohesive than MNB-MPC powders.

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Generation methods, stability, detection techniques, and applications of bulk nanobubbles in agro-food industries: a review and future perspective

Cited by 17 publications

References 149 publications

Do Ultrafine Bubbles Work as Oxygen Carriers?

Do Ultrafine Bubbles Work as Oxygen Carriers?

Augmenting the Leidenfrost Temperature of Droplets via Nanobubble Dispersion

Influence of micro- and nano-bubble treatment on morphological characteristics and flow properties of spray-dried milk protein concentrate powders

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