151
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Jadhav AJ, Barigou M. Proving and interpreting the spontaneous formation of bulk nanobubbles in aqueous organic solvent solutions: effects of solvent type and content. SOFT MATTER 2020; 16:4502-4511. [PMID: 32342965 DOI: 10.1039/d0sm00111b] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We show that the mixing of organic solvents with pure water leads to the spontaneous formation of suspended nano-entities which exhibit long-term stability on the scale of months. A wide range of solvents representing different functional groups are studied: methanol, ethanol, propanol, acetone, DMSO and formamide. We use various physical and chemical analytical techniques to provide compounded evidence that the nano-entities observed in all these aqueous solvent solutions must be gas-filled nanobubbles as they cannot be attributed to solvent nanodroplets, impurities or contamination. The nanobubble suspensions are characterized in terms of their bubble size distribution, bubble number density and zeta potential. The bubble number density achieved is a function of the type of solvent. It increases sharply with solvent content, reaching a maximum at an intermediate solvent concentration, before falling off to zero. We show that, whilst bulk nanobubbles can exist in pure water, they cannot exist in pure organic solvents and they disappear at some organic solvent-water ratio depending on the type of solvent. The gas solubility of the solvent relative to water as well as the molecular structure of the solvent are determining factors in the formation and stability of bulk nanobubbles. These phenomena are discussed and interpreted in the light of the experimental results obtained.
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Affiliation(s)
- Ananda J Jadhav
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
| | - Mostafa Barigou
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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152
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Fan W, Zhang Y, Liu S, Li X, Li J. Alleviation of copper toxicity in Daphnia magna by hydrogen nanobubble water. JOURNAL OF HAZARDOUS MATERIALS 2020; 389:122155. [PMID: 32004833 DOI: 10.1016/j.jhazmat.2020.122155] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 11/27/2019] [Accepted: 01/20/2020] [Indexed: 06/10/2023]
Abstract
As a novel antioxidant, hydrogen water has been widely used to alleviate oxidative stress in plants as well as in the medical field. However, the function of hydrogen water in environmental toxicology remains unknown. In this study, combining nanobubbles (NBs) and hydrogen water, we investigate the effect and mechanism of hydrogen NB water on copper induced acute toxicity to water fleas (Daphnia magna). The 24-h lethal Cu concentrations at which 50 % of the population die were 84 μg/L in hydrogen NB water and 45 μg/L in control water, confirming that hydrogen NB water effectively alleviated acute Cu toxicity in D. magna. The results were consistent with a significant reduction of Cu uptake and decrease of Cu accumulation in D. magna. As confirmed in fluorescence spectrophotometry and high-content screening system analysis, the hydrogen NB water also significantly reduced the oxidative damage and improved Cu tolerance in D. magna. From the results, it can be inferred that hydrogen NB water alleviates Cu stress in D. magna by depressing Cu bioaccumulation and reducing oxidative stress. The results provide basic data of hydrogen NB water for environmental toxicologists, and also a reference for the application of hydrogen NB water in the environment.
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Affiliation(s)
- Wenhong Fan
- Department of Environmental Science and Engineering, School of Space and Environment, Beihang University, Beijing, 10191, China; Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, Beijing, 100191, China
| | - You Zhang
- Department of Environmental Science and Engineering, School of Space and Environment, Beihang University, Beijing, 10191, China
| | - Shu Liu
- Department of Environmental Science and Engineering, School of Space and Environment, Beihang University, Beijing, 10191, China; Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University, Beijing, 100191, China.
| | - Xiaomin Li
- Department of Environmental Science and Engineering, School of Space and Environment, Beihang University, Beijing, 10191, China
| | - Jiayao Li
- Department of Environmental Science and Engineering, School of Space and Environment, Beihang University, Beijing, 10191, China
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153
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Tan BH, An H, Ohl CD. How Bulk Nanobubbles Might Survive. PHYSICAL REVIEW LETTERS 2020; 124:134503. [PMID: 32302159 DOI: 10.1103/physrevlett.124.134503] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 02/28/2020] [Accepted: 03/03/2020] [Indexed: 05/23/2023]
Abstract
The existence of bulk nanobubbles has long been regarded with scepticism, due to the limitations of experimental techniques and the widespread assumption that spherical bubbles cannot achieve stable equilibrium. We develop a model for the stability of bulk nanobubbles based on the experimental observation that the zeta potential of spherical bubbles abruptly diverges from the planar value below 10 μm. Our calculations recover three persistently reported-but disputed-properties of bulk nanobubbles: that they stabilize at a typical radius of ∼100 nm, that this radius is bounded below 1 μm, and that it increases with ionic concentration.
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Affiliation(s)
- Beng Hau Tan
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore
- Low Energy Electronic Systems, Singapore-MIT Alliance for Research and Technology, 1 Create Way, 138602 Singapore
| | - Hongjie An
- Queensland Micro and Nanotechnology Centre, Griffith University, 170 Kessels Road, Nathan, Queensland 4111, Australia
| | - Claus-Dieter Ohl
- Otto von Guericke University Magdeburg, Institute of Experimental Physics, Universitätsplatz 2, 39016 Magdeburg, Germany
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154
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Adhikari BM, Truong T, Bansal N, Bhandari B. Effect of CO
2
Bubbles on Crystallization Behavior of Anhydrous Milk Fat. J AM OIL CHEM SOC 2020. [DOI: 10.1002/aocs.12343] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bhaskar Mani Adhikari
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
| | - Tuyen Truong
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
- School of ScienceRMIT University Melbourne Victoria 3083 Australia
| | - Nidhi Bansal
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
| | - Bhesh Bhandari
- School of Agriculture and Food SciencesThe University of Queensland Brisbane Queenland 4072 Australia
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155
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Kim E, Choe JK, Kim BH, Kim J, Park J, Choi Y. Unraveling the mystery of ultrafine bubbles: Establishment of thermodynamic equilibrium for sub-micron bubbles and its implications. J Colloid Interface Sci 2020; 570:173-181. [PMID: 32146244 DOI: 10.1016/j.jcis.2020.02.101] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 02/24/2020] [Accepted: 02/25/2020] [Indexed: 11/26/2022]
Abstract
HYPOTHESIS We test the validity of the Young-Laplace equation and Henry's law for sub-micron bubble suspensions, which has long been a questionable issue. Application of the two theories allows characterization of bubble diameter and gas molecule partitioning between gaseous and dissolved phases using two easily measurable variables: total gas content (CT) and bubble volume concentration (BVC). EXPERIMENTS We measure CT and BVC for sub-micron bubble suspensions generated from three pure gases, which allows calculation of bubble diameter for each suspension using the Young-Laplace equation and Henry's law. Uncertainties involved in the experimental measurements are assessed. Bubble size for each suspension is also directly measured using a dynamic light scattering (DLS) technique for comparison. FINDINGS Applying the two theories we calculate that the bubble diameters are in the range of 304-518 nm, which correspond very well with the DLS-measured diameters. Sensitivity analyses demonstrate that the correspondence of the calculated and DLS-measured bubble diameters should take place only if the two theories are valid. The gas molecule partitioning analysis shows that >96% of gas molecules in the suspension exist as dissolved phase, which suggests the significance of the dissolved phase for applications of the bubble suspensions.
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Affiliation(s)
- Euna Kim
- Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Republic of Korea; Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, United States(1)
| | - Jong Kwon Choe
- Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Byung Hyo Kim
- Center for Nanoparticle Research, Institute for Basic Science, Seoul 08826, Republic of Korea; School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Joodeok Kim
- Center for Nanoparticle Research, Institute for Basic Science, Seoul 08826, Republic of Korea; School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Jungwon Park
- Center for Nanoparticle Research, Institute for Basic Science, Seoul 08826, Republic of Korea; School of Chemical and Biological Engineering, and Institute of Chemical Process, Seoul National University, Seoul 08826, Republic of Korea
| | - Yongju Choi
- Department of Civil and Environmental Engineering, Seoul National University, Seoul 08826, Republic of Korea.
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156
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Jadhav A, Barigou M. Bulk Nanobubbles or Not Nanobubbles: That is the Question. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:1699-1708. [PMID: 32040327 PMCID: PMC7146852 DOI: 10.1021/acs.langmuir.9b03532] [Citation(s) in RCA: 91] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Bulk nanobubbles are a novel nanoscale bubble system with unusual properties which challenge our understanding of bubble behavior. Because of their extraordinary longevity, their existence is still not widely accepted as they are often attributed to the presence of supramolecular structures or contaminants. Nonetheless, bulk nanobubbles are attracting increasing attention in the literature, but reports generally lack objective evidence that the observed nano-entities are indeed nanobubbles. In this paper, we use various physical and chemical analytical techniques to provide multiple evidence that the nano-entities produced mechanically in pure water by a continuous high-shear rotor-stator device or acoustic cavitation and spontaneously by water-ethanol mixing are indeed gas-filled domains. We estimate that the results presented here combined provide conclusive proof that bulk nanobubbles do exist and they are stable. This paper should help close the debate about the existence of bulk nanobubbles and, hence, enable the scientific community to rather focus on developing the missing fundamental science in this area.
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157
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Lei W, Zhang M, Zhang Z, Zhan N, Fan R. Effect of bulk nanobubbles on the entrainment of kaolinite particles in flotation. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.12.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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158
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Jin J, Wang R, Tang J, Yang L, Feng Z, Xu C, Yang F, Gu N. Dynamic tracking of bulk nanobubbles from microbubbles shrinkage to collapse. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124430] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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159
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Luu TQ, Hong Truong PN, Zitzmann K, Nguyen KT. Effects of Ultrafine Bubbles on Gram-Negative Bacteria: Inhibition or Selection? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13761-13768. [PMID: 31553189 DOI: 10.1021/acs.langmuir.9b02641] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ultrafine bubbles exist in all liquids and are naturally stable. As their properties are not entirely known, it is unclear how they impact the surrounding solution and comparable-sized particles within it. It is essential to further investigate the properties of ultrafine bubbles in order to expand their industrial application. In this regard, the effect of ultrafine bubbles on bacterial development is of particular interest. Our current study, using optical density measurements and fluorescence microscopic images has demonstrated that ultrafine gas bubbles impact the morphology and phenotype of Escherichia coli and Pseudomonas aeruginosa. Specifically, Fourier transform infrared spectroscopic measurements indicated a thickening of bacterial membranes in samples exposed to ultrafine bubbles. The study also confirmed that ultrafine bubbles can inhibit bacterial cell growth. This study signifies the role of surface phenomena in bacterial culture, which is crucial in the upstream processes of recombinant DNA technology applications.
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Affiliation(s)
- Trong Quan Luu
- School of Biotechnology, International University , Viet Nam National University , Ho Chi Minh City 700,000 , Vietnam
| | - Phung Ngoc Hong Truong
- School of Biotechnology, International University , Viet Nam National University , Ho Chi Minh City 700,000 , Vietnam
| | - Kim Zitzmann
- College of Science , University College Dublin , Belfield, Dublin 4 D04 V1W8 , Ireland
| | - Khoi Tan Nguyen
- School of Biotechnology, International University , Viet Nam National University , Ho Chi Minh City 700,000 , Vietnam
- School of Chemical Engineering , The University of Queensland , Brisbane , Queensland 4072 , Australia
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160
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Does gas supersaturation by a chemical reaction produce bulk nanobubbles? J Colloid Interface Sci 2019; 554:388-395. [DOI: 10.1016/j.jcis.2019.07.016] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2019] [Revised: 07/05/2019] [Accepted: 07/07/2019] [Indexed: 12/22/2022]
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161
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Meegoda JN, Hewage SA, Batagoda JH. Application of the Diffused Double Layer Theory to Nanobubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12100-12112. [PMID: 31433652 DOI: 10.1021/acs.langmuir.9b01443] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Nanobubbles have electrically charged interfaces; hence, the diffused double layer theory can be applied to explain the behavior of nanobubbles in different electrolytic solutions. In this research, oxygen nanobubbles were generated in NaCl solutions of different concentrations, and bubble size and ζ potentials were measured just after the generation and after 1 week. The measured data and diffused double layer theory were used to compute the surface charge density, the potential due to the surface charge, and the interaction energy between bubbles. With the increased NaCl concentration, bubble size, surface charge density, and the number of negative charges increased, while the magnitude of ζ potential/surface potential, double layer thickness, internal pressure, and the electrostatic repulsion force decreased. The same trend was observed after 1 week. The net total energy calculation for the 0.001 M NaCl solution showed that the bubble repulsion for an intermediate separation distance had a 6.99 × 10-20 J energy barrier, which prevented bubble coalescence. Hence, the 0.001 M NaCl solution produced stable nanobubbles. The calculation of internal pressure inside nanobubbles showed a reduction in the interfacial pressure difference with the increased NaCl concentration. The test results, as well as diffuse double layer and net total energy calculations, showed that the most stable bubbles were obtained with 0.001 M NaCl concentration and the least stability was recorded with the highest amount (0.1 M) of NaCl concentration.
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Affiliation(s)
- Jay N Meegoda
- Department of Civil & Environmental Engineering , New Jersey Institute of Technology , 323 Dr M.L.K. Jr. Blvd. , Newark , New Jersey 07102 , United States
| | - Shaini Aluthgun Hewage
- Department of Civil & Environmental Engineering , New Jersey Institute of Technology , 323 Dr M.L.K. Jr. Blvd. , Newark , New Jersey 07102 , United States
| | - Janitha H Batagoda
- Department of Civil & Environmental Engineering , New Jersey Institute of Technology , 323 Dr M.L.K. Jr. Blvd. , Newark , New Jersey 07102 , United States
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162
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Letellier P, Turmine M. Bubble Solution Description by Non-Extensive Thermodynamics: Pressure Effect. Chemphyschem 2019; 20:2230-2235. [PMID: 31328380 DOI: 10.1002/cphc.201900412] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Indexed: 12/23/2022]
Abstract
We showed in this study that nanobubble solutions should not be considered as the simple juxtaposition of autonomous phases (a solution and bubbles) but as particular entities, that is, "supersaturated solutions" where gas is simultaneously in two forms in permanent exchange. Gibbs' extensive thermodynamics cannot claim to describe legitimately their behavior. In this work, we showed how the use of the non-extensive thermodynamics allows describing the physicochemical properties of such media, some of which are counter-intuitive. Thus, an increase in pressure can result in an increase in the bubble size, contrary to what is provided by Boyle-Mariotte's law. The theoretical relationships proposed in this work constitute another approach to bubble solutions, which considers the non-autonomous nature of the components of supersaturated gas solutions and their "non-extensive" nature.
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Affiliation(s)
- Pierre Letellier
- Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Électrochimiques (LISE), 4, place Jussieu, 75005, Paris, France
| | - Mireille Turmine
- Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Électrochimiques (LISE), 4, place Jussieu, 75005, Paris, France
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163
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Adhikari BM, Tung VP, Truong T, Bansal N, Bhandari B. Impact of In-Situ CO2 Nano-Bubbles Generation on Freezing Parameters of Selected Liquid Foods. FOOD BIOPHYS 2019. [DOI: 10.1007/s11483-019-09604-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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164
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Li F, Wang Y, Mo X, Deng Z, Yan F. Acoustic Characteristics of Biosynthetic Bubbles for Ultrasound Contrast Imaging. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:10213-10222. [PMID: 31119938 DOI: 10.1021/acs.langmuir.9b01225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Biosynthetic bubbles produced by floating microorganisms, such as bacteria and algae, have recently attracted wide attention as novel ultrasound contrast agents owing to their significant potential in ultrasound imaging and acoustic reporter gene-based imaging. However, the acoustics properties of these bubbles are unclear. In this study, we developed a finite-element model to describe the oscillation of nonspherical biosynthetic bubbles composed of a gas core encapsulated in a protein shell. In this model, the elastic properties of the bubble shells were characterized in terms of the density, thickness, Young's modulus, and Poisson's ratio. Theoretical calculations were performed for a single bubble and an assembly of randomly oriented bubbles. Our results demonstrate that (1) there are many types of surface oscillation modes for nonspherical biosynthetic bubbles, and a systematic relationship exists between the surface modes and the resonance frequencies; (2) the bubble shell shape has a significant effect on the acoustic behavior; (3) the resonance frequency of an ellipsoidal bubble decreases with the decrease in its polar radius-to-equatorial axis ratio; and (4) the acoustic scattering of a randomly oriented suspension is isotropic at and below the first resonance frequency. Our findings provide physical insight into the biomedical applications of biosynthetic bubbles and can be used to optimize the acoustics properties of such bubbles.
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Affiliation(s)
- Fei Li
- Paul C. Lauterbur Research Center for Biomedical Imaging , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen 518055 , China
- Shenzhen Key Laboratory of Ultrasound Imaging and Therapy , Shenzhen 518055 , China
| | - Yu Wang
- Paul C. Lauterbur Research Center for Biomedical Imaging , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen 518055 , China
- The Second School of Clinical Medicine , Southern Medical University , Guangzhou 510515 , China
- Guangdong Second Provincial General Hospital , Guangzhou 510317 , China
| | - Xinghai Mo
- Department of Ultrasound in Medicine, Shanghai East Hospital, School of Medicine , Tongji University , Shanghai 200120 , China
| | - Zhiting Deng
- Paul C. Lauterbur Research Center for Biomedical Imaging , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen 518055 , China
- Shenzhen Key Laboratory of Ultrasound Imaging and Therapy , Shenzhen 518055 , China
| | - Fei Yan
- Paul C. Lauterbur Research Center for Biomedical Imaging , Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen 518055 , China
- Shenzhen Key Laboratory of Ultrasound Imaging and Therapy , Shenzhen 518055 , China
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165
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Rak D, Ovadová M, Sedlák M. (Non)Existence of Bulk Nanobubbles: The Role of Ultrasonic Cavitation and Organic Solutes in Water. J Phys Chem Lett 2019; 10:4215-4221. [PMID: 31295404 DOI: 10.1021/acs.jpclett.9b01402] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A drawback of studies on bulk nanobubbles is the absence of direct proof that the nano-objects reported are really nanobubbles. The aim of our work was to provide such a proof or disproof. We focused on two effects (processes) commonly considered in research on nanobubbles: ultrasonic cavitation and addition of organic compounds to water, which could create in principle a barrier at the gas/water interface contributing to the stability of nanobubbles. We found that both of these processes lead to the generation of nano-objects, which are, however, not bulk nanobubbles. Ultrasonication leads to the formation of fine metal nanoparticles originating from the disintegration of the surface of the metal ultrasonic probe. Addition of organic solutes to water leads to the formation of a population of nanoparticles/nanodroplets originating from the so-called mesoscale solubilization of hydrophobic compounds present in the added solute as molecularly dissolved impurities. Subsequent ultrasonication of such mixtures adds metal nanoparticles and only slightly modifies the size distribution of mesoscale particles. While our results do not dismiss existence of nanobubbles in general, described effects must be seriously taken into account, especially in the case of biomedical applications where they can result in serious side effects.
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Affiliation(s)
- Dmytro Rak
- Institute of Experimental Physics , Slovak Academy of Sciences , Watsonova 47 , 040 01 Košice , Slovakia
| | - Michaela Ovadová
- Institute of Experimental Physics , Slovak Academy of Sciences , Watsonova 47 , 040 01 Košice , Slovakia
| | - Marián Sedlák
- Institute of Experimental Physics , Slovak Academy of Sciences , Watsonova 47 , 040 01 Košice , Slovakia
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166
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Xiao W, Zhao Y, Yang J, Ren Y, Yang W, Huang X, Zhang L. Effect of Sodium Oleate on the Adsorption Morphology and Mechanism of Nanobubbles on the Mica Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9239-9245. [PMID: 31268336 DOI: 10.1021/acs.langmuir.9b01384] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nanobubbles promote the flotation of fine-grained minerals. In the associated mechanism, the aggregation of fine particles is first promoted, which increases the probability of collision between particles and bubbles. However, the interaction between nanobubbles and mineral particles is often neglected, especially when the surface properties of the nanobubbles are modified by flotation collectors. In this study, the interaction mechanism between nanobubbles and the mica surface is investigated by nanoparticle tracking analysis, zeta potential measurement, and atomic force microscopy. The results reveal that the hydrophobic group of sodium oleate points toward the inside of the nanobubble and the hydrophilic group faces outward after the interaction of sodium oleate molecules and nanobubbles. A surfactant micelle with nanobubbles as the core is formed, thus considerably reducing the concentration of sodium oleate to form micelles. The adsorption of the modified nanobubbles on the mineral surface is carried out by the specific adsorption of the exposed hydrophilic group and the mineral surface. This adsorption method is superior to the hydrophobic interaction between the nanobubbles and the hydrophobic mineral surface. Further, the nanobubbles are highly selective for the activation sites on the mineral surface in the adsorption mode. This study will help understand the interaction between nanobubbles and collectors to further apply nanobubbles to treat fine-grained mineral particles.
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Affiliation(s)
- Wei Xiao
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Yulong Zhao
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Juan Yang
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Yaxin Ren
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Wei Yang
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Xiaotao Huang
- The Institute for Advanced Studies , Wuhan University , Wuhan 430072 , China
| | - Lijuan Zhang
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute , Chinese Academy of Sciences , Shanghai 201204 , China
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167
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Hain N, Handschuh-Wang S, Wesner D, Druzhinin SI, Schönherr H. Multimodal microscopy-based identification of surface nanobubbles. J Colloid Interface Sci 2019; 547:162-170. [PMID: 30952078 DOI: 10.1016/j.jcis.2019.03.084] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 03/24/2019] [Accepted: 03/25/2019] [Indexed: 10/27/2022]
Abstract
HYPOTHESIS Surface nanobubbles, which were controversially discussed in the literature, promise a number of outstanding applications, and their presence may hamper nanoscale processes at solid-aqueous interfaces. A most crucial and yet unsolved question is the rapid and conclusive identification of gas-filled (surface) nanobubbles. We hypothesize that surface nanobubbles and oil nanodroplets can be conclusively differentiated in co-localization experiments with atomic force microscopy (AFM) and time-resolved fluorescence microscopy by localizing tracer fluorophores and analyzing their fluorescence lifetimes. EXPERIMENTS Combined AFM and fluorescence lifetime imaging microscopy (FLIM) were conducted to localize the various interfaces labelled by the reporter dye rhodamine 6G (Rh6G). The dependence of the fluorescence lifetime of Rh6G on its local environment was determined for air/water, water/glass and polysiloxane/water interfaces under different conditions. FINDINGS In in situ co-localization experiments, surface nanobubbles labeled with Rh6G were probed by AFM with high spatial resolution and were differentiated from polysiloxane droplets as well as contamination originating from lubricant-coated syringe needles owing to the characteristic short fluorescence lifetime of Rh6G at the gas/water interface observed in FLIM. In particular, this approach lends itself to conclusively identify and rapidly differentiate these gas-filled entities from adsorbed contamination, such as siloxane-based oil nanodroplets.
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Affiliation(s)
- Nicole Hain
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Stephan Handschuh-Wang
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Daniel Wesner
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Sergey I Druzhinin
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Holger Schönherr
- Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), Department of Chemistry and Biology, School of Science and Technology, University of Siegen, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
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168
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Hamamoto S, Sugimoto T, Takemura T, Nishimura T, Bradford SA. Nanobubble Retention in Saturated Porous Media under Repulsive van der Waals and Electrostatic Conditions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:6853-6860. [PMID: 31058507 DOI: 10.1021/acs.langmuir.9b00507] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
An understanding of nanobubble (NB) migration in porous media is needed for potential environmental applications. The solution chemistry is well known to be a critical factor in determining interactions of other colloids and nanoparticles with surfaces. However, little quantitative research has examined the influence of solution chemistry on NB transport. One-dimensional column experiments were therefore conducted to investigate the transport, retention, and release of NBs in glass beads under different solution chemistry conditions. NB concentrations in the effluent were reduced with an increase in ionic strength (IS) or a decrease in pH due to a reduction in the repulsive force between the glass surface and NBs, especially when the solution contained Ca2+ as compared to Na+ and for larger NBs. This result was somewhat surprising because electrostatic and van der Waals interactions for NBs were both repulsive on a homogeneous glass bead surface. NB retention on the surface was explained by ubiquitous nanoscale roughness on the glass beads that significantly lowered the energy barrier and localized attractive charge heterogeneity and/or hydrophobic interactions. In contrast to Na+, adsorbed Ca2+ ions produced charge heterogeneity that enhanced NB retention and inhibited release with IS reduction.
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Affiliation(s)
- Shoichiro Hamamoto
- Graduate School of Agricultural and Life Sciences , The University of Tokyo , 1-1-1, Yayoi , Bunkyoku, Tokyo 113-8657 , Japan
| | - Takuya Sugimoto
- Graduate School of Agricultural and Life Sciences , The University of Tokyo , 1-1-1, Yayoi , Bunkyoku, Tokyo 113-8657 , Japan
| | - Takato Takemura
- College of Humanities and Sciences , Nihon University , 3-25-40, Sakurajousui , Setagaya, Tokyo 156-8550 , Japan
| | - Taku Nishimura
- Graduate School of Agricultural and Life Sciences , The University of Tokyo , 1-1-1, Yayoi , Bunkyoku, Tokyo 113-8657 , Japan
| | - Scott A Bradford
- U.S. Salinity Laboratory , USDA, ARS , 450 W. Big Springs Road , Riverside , California 92507-4617 , United States
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169
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Varade SR, Ghosh P. Foaming in aqueous solutions of mixtures of a zwitterionic and a cationic surfactant in presence of an electrolyte. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2019.1614944] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Shailesh R. Varade
- Department of Chemical Engineering, Indian Institute of Technology Guwahati , Guwahati , Assam , India
| | - Pallab Ghosh
- Department of Chemical Engineering, Indian Institute of Technology Guwahati , Guwahati , Assam , India
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170
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Generation of nanoparticles upon mixing ethanol and water; Nanobubbles or Not? J Colloid Interface Sci 2019; 542:136-143. [DOI: 10.1016/j.jcis.2019.01.134] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 01/30/2019] [Accepted: 01/31/2019] [Indexed: 01/08/2023]
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171
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Jin J, Feng Z, Yang F, Gu N. Bulk Nanobubbles Fabricated by Repeated Compression of Microbubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4238-4245. [PMID: 30817886 DOI: 10.1021/acs.langmuir.8b04314] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Nanobubbles (NBs), given its extraordinary properties, have drawn keen attention in the field of nanotechnology worldwide. However, compared to that of surface NBs, generation of stable bulk NBs remains an arduous task with the prevailing method. In this study, we developed a pressure-driven method to prepare bulk NBs by repeatedly compressing sulfur hexafluoride (SF6) gas into water. The results show that NBs with a mean diameter of 240 ± 9 nm and a polydispersity index of 0.25 were successfully prepared. The generated NBs had a high negative zeta potential (-40 ± 2 mV) with stability of more than 48 h. Under the condition of 600 times repeated compression, the NB concentration could reach about 1.92 × 1010 bubbles/mL. Furthermore, we examine the possible formation mechanism involved in NB generation by virtue of optical microscopy and attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. The microscopic results showed that microbubbles about 10-50 μm formed first and then decreased to be nanoscale-sized. A stronger hydrogen bond was detected by ATR-FTIR spectroscopy during the shrinking of microbubbles into NBs. It is speculated that the disappearance of microbubbles contributes to the formation of NBs, and the strong hydrogen bond at the gas-water interface prompts the stability of NBs. Therefore, repeated compression of the gas in aqueous solution could be a new method to prepare stable nanosized bubbles for wide applications in the future.
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Affiliation(s)
- Juan Jin
- State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering , Southeast University , Sipailou 2 , Nanjing , Jiangsu 210009 , P. R. China
| | - Zhenqiang Feng
- State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering , Southeast University , Sipailou 2 , Nanjing , Jiangsu 210009 , P. R. China
| | - Fang Yang
- State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering , Southeast University , Sipailou 2 , Nanjing , Jiangsu 210009 , P. R. China
| | - Ning Gu
- State Key Laboratory of Bioelectronics, Jiangsu Key Laboratory for Biomaterials and Devices, School of Biological Sciences and Medical Engineering , Southeast University , Sipailou 2 , Nanjing , Jiangsu 210009 , P. R. China
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172
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Nirmalkar N, Pacek AW, Barigou M. Bulk Nanobubbles from Acoustically Cavitated Aqueous Organic Solvent Mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2188-2195. [PMID: 30636423 DOI: 10.1021/acs.langmuir.8b03113] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We investigate the existence and stability of bulk nanobubbles in various aqueous organic solvent mixtures. Bulk nanobubble suspensions generated via acoustic cavitation are characterized in terms of their bubble size distribution, bubble number density, and zeta potential. We show that bulk nanobubbles exist in pure water but do not exist in pure organic solvents, and they disappear at some organic solvent-water ratio. We monitor the nanobubble suspensions over a period of a few months and propose interpretations for the differences behind their long-term stability in pure water versus their long-term stability in aqueous organic solvent solutions. Bulk nanobubbles in pure water are stabilized by their substantial surface charge arising from the adsorption of hydroxyl ions produced by self-ionization of water. Pure organic solvents do not autoionize, and therefore, nanobubbles cannot exist in concentrated aqueous organic solvent solutions. Because of preferential adsorption of organic solvent molecules at the nanobubble interfaces, the surface charge of the nanobubbles decreases with the solvent content, but the strong hydrogen bonding near their interfaces ensures their stability. The mean bubble size increases monotonically with the solvent content, whereas the surface tension of the mixture is sharply reduced. This is in agreement with literature results on macro- and microbubbles in aqueous organic solutions, but it stands in stark contrast to the behavior of macro- and microbubbles in aqueous surfactant solutions.
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Affiliation(s)
- N Nirmalkar
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham B15 2TT , U.K
| | - A W Pacek
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham B15 2TT , U.K
| | - M Barigou
- School of Chemical Engineering , University of Birmingham , Edgbaston , Birmingham B15 2TT , U.K
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173
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Min SH, Berkowitz ML. Bubbles in water under stretch-induced cavitation. J Chem Phys 2019; 150:054501. [DOI: 10.1063/1.5079735] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- Sa Hoon Min
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
| | - Max L. Berkowitz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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174
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Generation and Stability of Size-Adjustable Bulk Nanobubbles Based on Periodic Pressure Change. Sci Rep 2019; 9:1118. [PMID: 30718777 PMCID: PMC6362149 DOI: 10.1038/s41598-018-38066-5] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 12/18/2018] [Indexed: 01/27/2023] Open
Abstract
Recently, bulk nanobubbles have attracted intensive attention due to the unique physicochemical properties and important potential applications in various fields. In this study, periodic pressure change was introduced to generate bulk nanobubbles. N2 nanobubbles with bimodal distribution and excellent stabilization were fabricated in nitrogen-saturated water solution. O2 and CO2 nanobubbles have also been created using this method and both have good stability. The influence of the action time of periodic pressure change on the generated N2 nanobubbles size was studied. It was interestingly found that, the size of the formed nanobubbles decreases with the increase of action time under constant frequency, which could be explained by the difference in the shrinkage and growth rate under different pressure conditions, thereby size-adjustable nanobubbles can be formed by regulating operating time. This study might provide valuable methodology for further investigations about properties and performances of bulk nanobubbles.
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175
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Hernandez C, Abenojar EC, Hadley J, de Leon AC, Coyne R, Perera R, Gopalakrishnan R, Basilion JP, Kolios MC, Exner AA. Sink or float? Characterization of shell-stabilized bulk nanobubbles using a resonant mass measurement technique. NANOSCALE 2019; 11:851-855. [PMID: 30601524 PMCID: PMC6350620 DOI: 10.1039/c8nr08763f] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 11/25/2018] [Indexed: 05/14/2023]
Abstract
Nano-sized shell-stabilized gas bubbles have applications in various fields ranging from environmental science to biomedical engineering. A resonant mass measurement (RMM) technique is demonstrated here as a new and only method capable of simultaneously measuring the size and concentration of buoyant and non-buoyant particles in a nanobubble sample used as a next-generation ultrasound contrast agent.
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Affiliation(s)
- Christopher Hernandez
- Department of Radiology
, Case Western Reserve University
,
Cleveland
, OH
, 44106 USA
.
| | - Eric C. Abenojar
- Department of Radiology
, Case Western Reserve University
,
Cleveland
, OH
, 44106 USA
.
| | | | - Al Christopher de Leon
- Department of Radiology
, Case Western Reserve University
,
Cleveland
, OH
, 44106 USA
.
| | - Robert Coyne
- Malvern Panalytical
,
Westborough
, MA
, 01581 USA
| | - Reshani Perera
- Department of Radiology
, Case Western Reserve University
,
Cleveland
, OH
, 44106 USA
.
| | | | - James P. Basilion
- Department of Radiology
, Case Western Reserve University
,
Cleveland
, OH
, 44106 USA
.
- Department of Biomedical Engineering
, Case Western Reserve University
,
Cleveland
, OH
, 44106 USA
| | - Michael C. Kolios
- Department of Physics
, Ryerson University
,
Toronto
, Ontario
, Canada M5B 2K3
| | - Agata A. Exner
- Department of Radiology
, Case Western Reserve University
,
Cleveland
, OH
, 44106 USA
.
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176
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Guo Z, Wang X, Wang H, Hu B, Lei Z, Kobayashi M, Adachi Y, Shimizu K, Zhang Z. Effects of nanobubble water on the growth ofLactobacillus acidophilus1028 and its lactic acid production. RSC Adv 2019; 9:30760-30767. [PMID: 35529350 PMCID: PMC9072192 DOI: 10.1039/c9ra05868k] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 09/02/2019] [Indexed: 01/05/2023] Open
Abstract
Nanobubbles (NBs) in the culture medium may offer a new way of accelerating bacterial growth in the lag and logarithmic phases.
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Affiliation(s)
- Zitao Guo
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Xuezhi Wang
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Hanxiao Wang
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Bo Hu
- National Engineering Research Center for Functional Food
- Jiangnan University
- Wuxi 214122
- China
| | - Zhongfang Lei
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Motoyoshi Kobayashi
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Yasuhisa Adachi
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Kazuya Shimizu
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Zhenya Zhang
- Graduate School of Life and Environmental Sciences
- University of Tsukuba
- Tsukuba
- Japan
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177
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Nirmalkar N, Pacek AW, Barigou M. Interpreting the interfacial and colloidal stability of bulk nanobubbles. SOFT MATTER 2018; 14:9643-9656. [PMID: 30457138 DOI: 10.1039/c8sm01949e] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This paper elucidates parts of the mystery behind the interfacial and colloidal stability of the novel bubble system of bulk nanobubbles. Stable bulk nanobubble suspensions have been generated in pure water using hydrodynamic cavitation in a high-pressure microfluidic device. The effects of pH adjustment, addition of different types of surfactant molecules and salts on the nanobubble suspensions have been studied. Results show that nanobubble interfaces in pure water are negatively charged, suggesting the formation of an electric double layer around the nanobubbles. It is presumed that the external electrostatic pressure created by the charged nanobubble interface, balances the internal Laplace pressure; therefore, no net diffusion of gas occurs at equilibrium and the nanobubbles are stable. Such stability increases with increasing alkalinity of the suspending medium. The addition of mono- and multi-valent salts leads to the screening of the electric double layer, hence, destabilizing the nanobubbles. Different surfactant molecules (non-ionic, anionic, cationic) affect the stability of bulk nanobubbles in different ways. Calculations based on the DLVO theory predict a stable colloidal system for bulk nanobubbles in pure water and this could be a further reason for their observed longevity. All in all, in pure water, the long-term stability of bulk nanobubbles seems to be caused by a combination of ion-stabilisation of their interface against dissolution and colloidal stability of the suspension.
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Affiliation(s)
- N Nirmalkar
- School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
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