1
|
Sharma A, Nirmalkar N. Bulk Nanobubbles through Gas Supersaturation Originated by Hot and Cold Solvent Mixing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:12729-12743. [PMID: 38845184 DOI: 10.1021/acs.langmuir.4c01358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2024]
Abstract
The nucleation mechanism of bulk nanobubbles remains unclear despite the considerable attention they have received in recent years. We propose two hypotheses: (i) The gas supersaturation in the bulk liquid is the primary factor for nanobubble nucleation, and (ii) the mixing of the same solvent at varying gas solubilities should produce nanobubbles, provided that the first hypothesis is correct. To test this hypothesis, we performed extensive experiments on nanobubble nucleation in both water and organic solvents. The temperature difference between hot and cold samples ranged from 10 to 80 °C in pure solvents such as water, methanol, ethanol, propanol, and butanol prepared and mixed in equal proportions. To the best of our knowledge, we report bulk nanobubble nucleation by mixing hot and cold solvents for the first time. The refractive index value calculations using Mie scattering theory confirmed the existence of nanobubbles. When surface tension dominates over surface charge, the critical work for nanobubble formation is ΔFc ∝ 1/ξ2, and when surface charge dominates over surface tension, the critical work is ΔFc ∝ ξ1/4. Our experimental results verify such dependency by measuring nanobubbles nucleated with varying degrees of gas supersaturation.
Collapse
Affiliation(s)
- Aakriti Sharma
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| | - Neelkanth Nirmalkar
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar, Punjab 140001, India
| |
Collapse
|
2
|
Kodama K, Hattori S, Yasuda K, Saitoh T. Evaluation of solvent property of air-water interface based on the fluorescence spectra of 1,2'-dinaphthylamine in the aqueous solution of ultrafine bubbles. ANAL SCI 2024; 40:341-345. [PMID: 37938520 DOI: 10.1007/s44211-023-00454-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 10/11/2023] [Indexed: 11/09/2023]
Abstract
Solvent property of air-water interface was evaluated based on the fluorescence spectra of 1,2'-dinaphthylamine in water containing ultrafine bubbles (average diameter: 103 nm, standard deviation: 38 nm). Among naphthylamine derivatives whose fluorescence spectra were responsive to microscopic hydrophobicity, 1,2'-dinaphthylamine (DN) was selected because its wavelength of the maximum emission (λmax) was significantly dependent on the concentration and microenvironment of the ultrafine bubble. The λmax value of DN in water was 486 nm, while it shifted to shorter wavelength (408 nm) in the presence of 1.09 × 109 mL-1 of ultrafine bubbles. The shift of λmax value indicates that DN adsorbs on the surfaces of ultrafine bubbles and exists in hydrophobic region rather than in bulk water. By comparing with the λmax values in different solvents, the surface of ultrafine bubble was found to have similar solvent property to ethyl ether or ethyl acetate that are widely used as extracting solvents for hydrophobic organic compounds.
Collapse
Affiliation(s)
- Koki Kodama
- Graduate School of Engineering, Kitami Institute of Technology, 165 Koen-Cho, Kitami, Hokkaido, 090-8507, Japan
| | - Shogo Hattori
- Graduate School of Engineering, Kitami Institute of Technology, 165 Koen-Cho, Kitami, Hokkaido, 090-8507, Japan
| | - Keiji Yasuda
- Graduate School of Engineering, Nagoya University, Furo-Cho, Chikusa-Ku, Nagoya, Aichi, 464-8603, Japan
| | - Tohru Saitoh
- Graduate School of Engineering, Kitami Institute of Technology, 165 Koen-Cho, Kitami, Hokkaido, 090-8507, Japan.
| |
Collapse
|
3
|
Morishita R, Shimada M, Nagao M, Shimizu S, Kamei N, Takeda-Morishita M. In Vivo Proof of Biological Safety and Physiological Effects of Orally Ingested Water Containing H 2-Filled Ultrafine Bubbles (UFBs). Biol Pharm Bull 2023; 46:343-347. [PMID: 36724963 DOI: 10.1248/bpb.b22-00631] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Owing to their unique physicochemical properties and diverse biological effects, ultrafine bubbles (UFBs) have recently been expected to be utilized for industrial and biological purposes. Thus, this study investigated the biological safety of UFBs in water for living beings in drinking the water with a view to future use in health sciences. In this study, we used H2-filled UFBs (NanoGAS®) that can hold hydrogen in the aqueous phase for a long time. Mice were randomly assigned to one of three groups: those receiving NanoGAS® water, reverse osmosis water, or natural mineral water, and they ingested it ad libitum for one month or three months. As a result, subchronic drinking of NanoGAS® water does not affect either the common blood biochemical parameters or the health of the organs and mucosal membranes. Our results, for the first time, scientifically demonstrated the biological safety of H2-filled UFBs water for subchronic oral consumption.
Collapse
Affiliation(s)
- Risako Morishita
- Shinbiosis Corp., 106 Kobe Health Industry Development Center.,Intestinal Microbiota Transplantation Clinical Research Inc
| | - Miki Shimada
- Laboratory of Drug Delivery Systems, Faculty of Pharmaceutical Sciences, Kobe Gakuin University
| | - Minami Nagao
- Laboratory of Drug Delivery Systems, Faculty of Pharmaceutical Sciences, Kobe Gakuin University
| | - Shin Shimizu
- Shinbiosis Corp., 106 Kobe Health Industry Development Center.,Intestinal Microbiota Transplantation Clinical Research Inc
| | - Noriyasu Kamei
- Laboratory of Drug Delivery Systems, Faculty of Pharmaceutical Sciences, Kobe Gakuin University
| | - Mariko Takeda-Morishita
- Laboratory of Drug Delivery Systems, Faculty of Pharmaceutical Sciences, Kobe Gakuin University
| |
Collapse
|
4
|
Syaeful Alam H, Sutikno P, Soelaiman TAF, Sugiarto AT. Population Balance Modeling and Multi‐Response Optimization of a Swirling‐Flow Nanobubble Generator. Chem Eng Technol 2022. [DOI: 10.1002/ceat.202100360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hilman Syaeful Alam
- Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung, Doctoral Program of Mechanical Engineering Jalan Ganesha 10 40132 Bandung Indonesia
- National Research and Innovation Agency Jalan Sangkuriang Gedung 80 40135 Bandung Indonesia
| | - Priyono Sutikno
- Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung, Doctoral Program of Mechanical Engineering Jalan Ganesha 10 40132 Bandung Indonesia
| | - Tubagus Ahmad Fauzi Soelaiman
- Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung, Doctoral Program of Mechanical Engineering Jalan Ganesha 10 40132 Bandung Indonesia
| | - Anto Tri Sugiarto
- National Research and Innovation Agency Jalan Sangkuriang Gedung 80 40135 Bandung Indonesia
| |
Collapse
|
5
|
Kakiuchi K, Miyasaka T, Harii N, Takeoka S. Development of quantitative and concise measurement method of oxygen in fine bubble dispersion. PLoS One 2022; 17:e0264083. [PMID: 35171962 PMCID: PMC8849465 DOI: 10.1371/journal.pone.0264083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 02/02/2022] [Indexed: 11/24/2022] Open
Abstract
Fine bubbles (FBs) have attracted significant attention in several research fields. Although some reports have argued that FB dispersion is useful as an oxygen (gas) carrier, only a few reports have examined its properties as an oxygen carrier using experimental data. As one of the reasons for this, there are no standard methods for measuring the oxygen content in FB dispersions. Conventional oxygen measurement methods have certain drawbacks in accuracy or speed; thus, it is difficult to use oxygen content as the primary outcome. In this study, we introduce a Clark-type polarographic oxygen electrode device (OXYG1-PLUS) for oxygen measurement, allowing the dilution of FB dispersion without the influence of ambient air and the adhesion of FBs on the electrode surface due to its special shape. First, the accuracy of our dilution method was evaluated using pure water as a sample, and it was confirmed that our method could measure with an accuracy of ±0.5 mg/L from the results with conventional dissolved oxygen meters. Second, the oxygen content in FB dispersion was evaluated with our method and a chemical titration method (Winkler’s method), and it was found that our method could measure the oxygen content in FB dispersions quantitively. This method satisfies the easiness (4 steps) and quickness (within 8 min) for a wide range of oxygen contents (0 to 332 mg/L, theoretical range) with low coefficient variation (< 4.7%) and requires a small sample volume (50–500 μL); thus, it is a useful method for measuring the oxygen in FB dispersions.
Collapse
Affiliation(s)
- Kenta Kakiuchi
- Faculty of Science and Engineering, Waseda University (TWIns), Shinjuku, Tokyo, Japan
| | - Takehiro Miyasaka
- Department of Materials and Human Environmental Science, Shonan Institute of Technology, Fujisawa, Kanagawa, Japan
| | - Norikazu Harii
- Department of Community and Family Medicine, Faculty of Medicine, University of Yamanashi, Chou, Yamanashi, Japan
| | - Shinji Takeoka
- Faculty of Science and Engineering, Waseda University (TWIns), Shinjuku, Tokyo, Japan
- Institute for Advanced Research of Biosystem Dynamics, Research Institute for Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan
- * E-mail:
| |
Collapse
|
6
|
Agarwal K, Trivedi M, Nirmalkar N. Does salting-out effect nucleate nanobubbles in water: Spontaneous nucleation? ULTRASONICS SONOCHEMISTRY 2022; 82:105860. [PMID: 34915251 PMCID: PMC8683758 DOI: 10.1016/j.ultsonch.2021.105860] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 11/30/2021] [Accepted: 12/04/2021] [Indexed: 05/05/2023]
Abstract
The solubility of gases in aqueous salt solution decreases with the salt concentration, often termed the "salting-out effect." The dissolution of salt in water is followed by dissociation of salt and further solvation of ions with water molecules. The solvation weakens the affinity of gaseous molecules, and thus it releases the excess dissolved gas. Now it is interesting to know that what happens to the excess gas released during salting-out? Since it is imperative to note that the transfer of the dissolved gas in the bulk liquid may often occur in the form of nanobubbles. In this work, we have answered this question by investigating the nano-entities nucleation during the salting-out effect. The solubility of gases in aqueous salt solution decreases with the salt concentration, and it is often termed as the "salting-out effects." The dissolution of salt in water undergoes dissociation of salt and further solvation of ions with water molecules. The solvation weakens the affinity of gaseous molecules, and thus it releases the excess dissolved gas. Now it is interesting to know that what happens to the excess gas released during salting-out? While it is also imperative to note that the gas transfer in the bulk liquid often occurs in the form of bubbles. With this hypothesis, we have experimentally investigated that whether the salting-out effect nucleates nanobubble or not. What is the strong scientific evidence to prove that they are nanobubbles? Does the salting-out parameter affect the number density? The answers to such questions are essential for the fundamental understanding of the origin and driving force for nanobubble generation. We have provided three distinct proofs for the nano-entities to be the nanobubbles, namely, (1) by freezing and thawing experiments, (2) by destroying the nanobubbles under ultrasound field, and (3) we also proposed a novel method for refractive index estimation of nanobubbles to differentiate them from nano drops and nanoparticles. The refractive index (RI) of nanobubbles was estimated to be 1.012 for mono- and di-valent salts and 1.305 for trivalent salt. The value of RI closer to 1 provides strong evidence of gas-filled nanobubbles. Both positive and negative charged nanobubbles nucleate during the salting-out effect depending upon the valency of salt. The nanobubbles during the salting-out effect are stable only for up to three days. This shorter stability could plausibly be due to reduced colloidal stability at a low surface charge.
Collapse
Affiliation(s)
- Kalyani Agarwal
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab, India
| | - Mohit Trivedi
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab, India
| | - Neelkanth Nirmalkar
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab, India.
| |
Collapse
|
7
|
Bulk Nanobubbles: generation using a two-chamber swirling flow nozzle and long-term stability in water. J Flow Chem 2021. [DOI: 10.1007/s41981-021-00208-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|