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Sharma H, Trivedi M, Nirmalkar N. Do Nanobubbles Exist in Pure Alcohol? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1534-1543. [PMID: 38176064 DOI: 10.1021/acs.langmuir.3c03592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
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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Affiliation(s)
- Harsh Sharma
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, India
| | - Mohit Trivedi
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, India
| | - Neelkanth Nirmalkar
- Department of Chemical Engineering, Indian Institute of Technology Ropar, Rupnagar 140001, India
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Agarwal K, Trivedi M, Ohl CD, Nirmalkar N. On Nanobubble Dynamics under an Oscillating Pressure Field during Salting-out Effects and Its DLVO Potential. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:5250-5262. [PMID: 37014662 DOI: 10.1021/acs.langmuir.2c03085] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
We have investigated the origin, stability, and nanobubble dynamics under an oscillating pressure field followed by the salting-out effects. The higher solubility ratio (salting-out parameter) of the dissolved gases and pure solvent nucleates nanobubbles during the salting-out effect, and the oscillating pressure field enhances the nanobubble density further as solubility varies linearly with gas pressure by Henry's law. A novel method for refractive index estimation is developed to differentiate nanobubbles and nanoparticles based on the scattering intensity of light. The electromagnetic wave equations have been numerically solved and compared with the Mie scattering theory. The scattering cross-section of the nanobubbles was estimated to be smaller than the nanoparticles. The DLVO potentials of the nanobubbles predict the stable colloidal system. The zeta potential of nanobubbles varied by generating nanobubbles in different salt solutions, and it is characterized by particle tracking, dynamic light scattering, and cryo-TEM. The size of nanobubbles in salt solutions was reported to be higher than that in pure water. The novel mechanical stability model is proposed by considering both ionic cloud and electrostatic pressure at the charged interface. The ionic cloud pressure is derived by electric flux balance, and it is found to be twice the electrostatic pressure. The mechanical stability model for a single nanobubble predicts the existence of stable nanobubbles in the stability map.
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Affiliation(s)
- Kalyani Agarwal
- Department of Chemical Engineering, Indian Institute of Technology, Ropar 140001, India
| | - Mohit Trivedi
- Department of Chemical Engineering, Indian Institute of Technology, Ropar 140001, India
| | - Claus-Dieter Ohl
- Otto-von-Guericke University Magdeburg, Faculty of Natural Sciences, Institute for Physics, Department Soft Matter, Universitaetsplatz 2, Magdeburg 39106, Germany
| | - Neelkanth Nirmalkar
- Department of Chemical Engineering, Indian Institute of Technology, Ropar 140001, India
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Bunkin NF, Bolotskova PN, Bondarchuk EV, Gryaznov VG, Kozlov VA, Okuneva MA, Ovchinnikov OV, Smoliy OP, Turkanov IF, Galkina CA, Dmitriev AS, Seliverstov AF. Stochastic Ultralow-Frequency Oscillations of the Luminescence Intensity from the Surface of a Polymer Membrane Swelling in Aqueous Salt Solutions. Polymers (Basel) 2022; 14:polym14040688. [PMID: 35215601 PMCID: PMC8874797 DOI: 10.3390/polym14040688] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 02/03/2022] [Accepted: 02/08/2022] [Indexed: 02/04/2023] Open
Abstract
Photoluminescence from the surface of a Nafion polymer membrane upon swelling in isotonic aqueous solutions and Milli-Q water has been studied. Liquid samples were preliminarily processed by electric pulses with a duration of 1 μs and an amplitude of 0.1 V using an antenna in the form of a flat capacitor; experiments on photoluminescent spectroscopy were carried out 20 min after this treatment. A typical dependence of the luminescence intensity, I, on the swelling time, t, obeys an exponentially decaying function. The characteristic decay time of these functions and the stationary level of luminescence intensity depend on the repetition rate of electrical pulses, and the obtained dependences are well reproduced. It transpired that, at certain pulse repetition rates, the dependence, I(t), is a random function, and there is no reproducibility. Stochastic effects are associated with a random external force of an electromagnetic nature that acts on a polymer membrane during swelling. The source of this random force, in our opinion, is low-frequency pulsations of neutron stars or white dwarfs.
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Affiliation(s)
- Nikolai F. Bunkin
- Department of Fundamental Sciences, Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005 Moscow, Russia; (P.N.B.); (V.A.K.); (M.A.O.)
- Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilova Str. 38, 119991 Moscow, Russia
- Correspondence:
| | - Polina N. Bolotskova
- Department of Fundamental Sciences, Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005 Moscow, Russia; (P.N.B.); (V.A.K.); (M.A.O.)
- Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilova Str. 38, 119991 Moscow, Russia
| | - Elena V. Bondarchuk
- “Concern GRANIT”, Gogolevsky Blvd., 31, 2, 119019 Moscow, Russia; (E.V.B.); (V.G.G.); (O.V.O.); (O.P.S.); (I.F.T.); (C.A.G.)
| | - Valery G. Gryaznov
- “Concern GRANIT”, Gogolevsky Blvd., 31, 2, 119019 Moscow, Russia; (E.V.B.); (V.G.G.); (O.V.O.); (O.P.S.); (I.F.T.); (C.A.G.)
| | - Valeriy A. Kozlov
- Department of Fundamental Sciences, Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005 Moscow, Russia; (P.N.B.); (V.A.K.); (M.A.O.)
- Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilova Str. 38, 119991 Moscow, Russia
| | - Maria A. Okuneva
- Department of Fundamental Sciences, Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005 Moscow, Russia; (P.N.B.); (V.A.K.); (M.A.O.)
- Prokhorov General Physics Institute, Russian Academy of Sciences, Vavilova Str. 38, 119991 Moscow, Russia
| | - Oleg V. Ovchinnikov
- “Concern GRANIT”, Gogolevsky Blvd., 31, 2, 119019 Moscow, Russia; (E.V.B.); (V.G.G.); (O.V.O.); (O.P.S.); (I.F.T.); (C.A.G.)
| | - Oleg P. Smoliy
- “Concern GRANIT”, Gogolevsky Blvd., 31, 2, 119019 Moscow, Russia; (E.V.B.); (V.G.G.); (O.V.O.); (O.P.S.); (I.F.T.); (C.A.G.)
| | - Igor F. Turkanov
- “Concern GRANIT”, Gogolevsky Blvd., 31, 2, 119019 Moscow, Russia; (E.V.B.); (V.G.G.); (O.V.O.); (O.P.S.); (I.F.T.); (C.A.G.)
| | - Catherine A. Galkina
- “Concern GRANIT”, Gogolevsky Blvd., 31, 2, 119019 Moscow, Russia; (E.V.B.); (V.G.G.); (O.V.O.); (O.P.S.); (I.F.T.); (C.A.G.)
| | - Alexandr S. Dmitriev
- Kotelnikov Institute of Radio Engineering and Electronics of the Russian Academy of Sciences, Mokhovaya 11, 7, 125009 Moscow, Russia;
| | - Alexandr F. Seliverstov
- Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, Leninsky Prospect 31, 4, 119071 Moscow, Russia;
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Xue S, Zhang Y, Marhaba T, Zhang W. Aeration and dissolution behavior of oxygen nanobubbles in water. J Colloid Interface Sci 2021; 609:584-591. [PMID: 34815086 DOI: 10.1016/j.jcis.2021.11.061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 11/11/2021] [Accepted: 11/12/2021] [Indexed: 11/16/2022]
Abstract
HYPOTHESIS Nanobubbles (NBs) in water elicit unique physicochemical and colloidal properties (e.g., high stability and longevity). Aeration kinetics and dissolution behavior of oxygen (O2) NBs are assumed to be bubble size dependent. EXPERIMENTS As an indicator for aeration efficiency, volumetric mass transfer coefficient (KL·a) was assessed by measuring the dissolved oxygen (DO) levels during aeration using O2 NBs with different sizes. Mass transfer coefficient (KL) was estimated by correlation analysis. Moreover, a modified Epstein-Plesset (EP) model was developed to predict the dissolution behavior by monitoring the DO and size changes during the dissolution of O2 NBs in water. FINDINGS A higher rate of DO increase and a higher equilibrium DO level were both observed after aeration with NBs that present higher surface areas for the mass transfer of O2 and a higher vapor pressure of O2 to drive the partitioning equilibrium. Dissolution kinetics of O2 NBs were highly dependent on the initial bubble size as indicated by the changes of bubble size and DO. Smaller NBs raised up DO faster, whereas larger NBs could lead to higher equilibrium DO levels. Moreover, the rate of DO decline and the quasi-steady DO levels both decreased when the dilution ratio increased, confirming that O2 NBs dictates the DO level in water. Finally, the dissolving NBs may either swell or shrink according to the model prediction.
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Affiliation(s)
- Shan Xue
- Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States.
| | - Yihan Zhang
- Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States.
| | - Taha Marhaba
- Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States.
| | - Wen Zhang
- Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ 07102, United States.
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5
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Gao Z, Wu W, Sun W, Wang B. Understanding the Stabilization of a Bulk Nanobubble: A Molecular Dynamics Analysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11281-11291. [PMID: 34520212 DOI: 10.1021/acs.langmuir.1c01796] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Bulk nanobubbles (NBs) have received considerable attention because of their extensive potential applications, such as in ultrasound imaging and water management. Although multiple types of experimental evidence have supported the existence and stabilization of bulk NBs, the underlying mechanism remains unclear. This study numerically investigates the bulk NB stabilization with molecular dynamics (MD) methods: the all-atom (AA) MD simulation is used for NBs of several nanometers diameter; the coarse-grained (CG) MD simulation is for the NBs of about 100 nm. The NB properties are statistically obtained and analyzed, including the inner density, inner pressure, surface charge, interfacial hydrogen bond (HB), and gaseous diffusion. The results show that the gas inside an NB has ultrahigh density (tens of kilograms per cubic meter). A double-layer surface charge exists on the NB. The inner/outer layer is positively/negatively charged, and the electrostatic stress can counteract part of the surface tension. In addition, the interfacial HB is weakened by the interaction between gas and water molecules, causing less surface tension. The above features are beneficial to NB stabilization. The NB equilibrium radii solved by the interfacial mechanical equilibrium equation agree with the MD results, indicating that this equation can describe the force balance of an NB as small as several nanometers. Besides, supersaturation appears to be necessary for the NB thermodynamic equilibrium. Based on Henry's law and the ideal gas law, the theoretical analysis suggests that the stability of the NB thermodynamic equilibrium is conditional: the number of gas molecules in NBs should be more than half that dissolved in liquid. This study unravels a stabilized bulk NB's properties and discusses the NB equilibrium and stabilization mechanism, which will advance the understanding and application of bulk NBs.
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Affiliation(s)
- Zhan Gao
- School of Aerospace Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Wangxia Wu
- School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China
| | - Weitao Sun
- School of Aerospace Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Bing Wang
- School of Aerospace Engineering, Tsinghua University, Beijing 100084, People's Republic of China
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6
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Long-Term Effect of Low-Frequency Electromagnetic Irradiation in Water and Isotonic Aqueous Solutions as Studied by Photoluminescence from Polymer Membrane. Polymers (Basel) 2021; 13:polym13091443. [PMID: 33947044 PMCID: PMC8124172 DOI: 10.3390/polym13091443] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 04/18/2021] [Accepted: 04/25/2021] [Indexed: 12/16/2022] Open
Abstract
The swelling of a polymer membrane NafionTM in deionized water and isotonic NaCl and Ringer’s solutions was studied by photoluminescent spectroscopy. According to our previous studies, the surface of this membrane could be considered as a model for a cellular surface. Liquid samples, in which the membrane was soaked, were subjected to preliminary electromagnetic treatment, which consisted of irradiating these samples with electric rectangular pulses of 1 µs duration using platinum electrodes immersed in the liquid. We used a series of pulses with a repetition rate of 11–125 Hz; the pulse amplitudes were equal to 100 and 500 mV. It turned out that at certain pulse repetition rates and their amplitudes, the characteristic swelling time of the polymer membrane significantly differs from the swelling time in untreated (reference) samples. At the same time, there is no effect for certain frequencies/pulse amplitudes. The time interval between electromagnetic treatment and measurements was about 20 min. Thus, in our experiments the effects associated with the long-term relaxation of liquids on the electromagnetic processing are manifested. The effect of long-term relaxation could be associated with a slight change in the geometric characteristics of bubston clusters during electromagnetic treatment.
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7
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Bunkin NF, Shkirin AV, Penkov NV, Goltayev MV, Ignatiev PS, Gudkov SV, Izmailov AY. Effect of Gas Type and Its Pressure on Nanobubble Generation. Front Chem 2021; 9:630074. [PMID: 33869139 PMCID: PMC8044797 DOI: 10.3389/fchem.2021.630074] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 01/13/2021] [Indexed: 12/31/2022] Open
Abstract
The dependence of the volume number density of ion-stabilized gas nanobubbles (bubstons) on the type of gas and the pressure created by this gas in deionized water and saline solution has been investigated. The range of external pressures from the saturated water vapor (17 Torr) to 5 atm was studied. It turned out that the growth rate of the volume number density of bubstons is controlled by the magnitude of the molecular polarizability of dissolved gases. The highest densities of bubstons were obtained for gases whose molecules have a dipole moment. At fixed external pressure and the polarizability of gas molecules, the addition of external ions leads to a sharp increase in the content of bubstons.
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Affiliation(s)
- Nikolai F Bunkin
- Bauman Moscow State Technical University, Moscow, Russia.,Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
| | - Alexey V Shkirin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia.,National Research Nuclear University MEPhI, Moscow, Russia
| | - Nikita V Penkov
- Federal Research Center "Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences", Institute of Cell Biophysics of the Russian Academy of Sciences, Moscow, Russia
| | - Mikhail V Goltayev
- Federal Research Center "Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences", Institute of Cell Biophysics of the Russian Academy of Sciences, Moscow, Russia
| | - Pavel S Ignatiev
- JSC "Production Association "Ural Optical and Mechanical Plant named after E.S. Yalamov" (UOMZ), Ekaterinburg, Russia
| | - Sergey V Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia.,Federal State Budgetary Scientific Institution "Federal Scientific Agroengineering Center VIM"(FSAC VIM), Moscow, Russia
| | - Andrey Yu Izmailov
- Federal State Budgetary Scientific Institution "Federal Scientific Agroengineering Center VIM"(FSAC VIM), Moscow, Russia
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8
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Hewage SA, Kewalramani J, Meegoda JN. Stability of nanobubbles in different salts solutions. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125669] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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9
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Tanaka S, Terasaka K, Fujioka S. Generation and Long‐Term Stability of Ultrafine Bubbles in Water. CHEM-ING-TECH 2020. [DOI: 10.1002/cite.202000143] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Shunya Tanaka
- Keio University School of Science for Open and Environmental Systems Graduate School of Science and Technology 3-14-1 Hiyoshi, Kohoku-ku 223-8522 Yokohama Kanagawa Japan
| | - Koichi Terasaka
- Keio University Department of Applied Chemistry Faculty of Science and Technology 3-14-1 Hiyoshi, Kohoku-ku 223-8522 Yokohama Kanagawa Japan
| | - Satoko Fujioka
- Keio University Department of Applied Chemistry Faculty of Science and Technology 3-14-1 Hiyoshi, Kohoku-ku 223-8522 Yokohama Kanagawa Japan
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10
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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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11
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Explosion of Microbubbles Generated by the Alternating Polarity Water Electrolysis. ENERGIES 2019. [DOI: 10.3390/en13010020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Water electrolysis with a fast change of polarity generates a high concentration of bulk nanobubbles containing H 2 and O 2 gases. When this concentration reaches a critical value, a microbubble pops up, which is terminated quickly in an explosion process. In this paper, we provide experimental information on the phenomenon concentrating on the dynamics of exploding microbubble observed from the top and from the side. An initial bubble with a size of 150 μ m expands to a maximum size of 1200 μ m for 150 μ s and then shrinks in the cavitation process. The sound produced by the event is coming from two sources separated in time: exploding bubble and cavitating bubble. The observed dynamics supports expansion of the bubble with steam but not with H 2 and O 2 mixture. A qualitative model of this puzzling phenomenon proposed earlier is refined. It is demonstrated that the pressure and temperature in the initial bubble can be evaluated using only the energy conservation law for which the driving energy is the energy of the combusted gas. The temperature in the bubble reaches 200 ∘ C that shows that the process cannot be ignited by standard combustion, but the surface-assisted spontaneous combustion agrees well with the observations and theoretical estimates. The pressure in the microbubble varies with the size of the merging nanobubbles and is evaluated as 10–20 bar. Large pressure difference between the bubble and liquid drives the bubble expansion, and is the source of the sound produced by the process. Exploding microbubbles are a promising principle to drive fast and strong micropumps for microfluidic and other applications.
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12
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Abstract
The state of oxygen in aqueous supersaturated solutions prepared by different methods was studied using high-resolution ultrasonic spectroscopy in combination with other techniques. This allowed for nondestructive evaluation of the properties of oxygen solute particles, composed of oxygen molecules and surrounding (coordinating) molecules of water, at equilibrium, supersaturated conditions, and different temperatures and concentrations of O2. The results were compared with the behaviors of other types of solutes in water, including H2O2, which has similar molecular size and mass to O2 but is characterized by a significantly different type of interaction with water molecules. Additionally, theoretical modeling was performed to assess the ultrasonic characteristics of dispersions of oxygen nanobubbles stabilized by a surface electrical charge. The obtained data indicate a clathrate-like organization of water in the coordination shells of single molecules of O2. We did not find any signs of formation of clusters of oxygen molecules in supersaturated solutions. No quantifiable presence of oxygen nanobubbles in the solutions was detected. The state of O2 molecules was not affected by supersaturation within the analyzed concentration range of oxygen. The results also demonstrated the potential of the ultrasonic technique in precision real-time nondestructive monitoring of oxygen solubilization and outgassing processes.
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Affiliation(s)
- Yuelong Li
- School of Chemistry, College of Life Science , University College Dublin , Belfield Campus , Dublin 4 , Ireland
| | - Vitaly Buckin
- School of Chemistry, College of Life Science , University College Dublin , Belfield Campus , Dublin 4 , Ireland
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13
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Alheshibri M, Craig VSJ. Armoured nanobubbles; ultrasound contrast agents under pressure. J Colloid Interface Sci 2019; 537:123-131. [PMID: 30423486 DOI: 10.1016/j.jcis.2018.10.108] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 10/30/2018] [Accepted: 10/30/2018] [Indexed: 12/21/2022]
Abstract
HYPOTHESIS Robust methods for differentiating long-lived nanobubbles from other nanoparticles are required. Evaluation of the density and compressibility of nanoparticles should enable nanobubbles to be differentiated from other nanoparticles, although the response of nanobubbles to pressure can be strongly influenced by a coating of insoluble surfactant. Here we evaluate the response of nanobubbles armoured with a coating of insoluble surfactants in order to determine if they can be differentiated from other nanoparticles. EXPERIMENTS Dynamic light scattering was used to size candidate nanoparticles under the influence of external pressure and resonant mass measurements were employed to assess the density of candidate nanoparticles. FINDINGS The resonant mass measurement revealed a significant population of lipid-coated gas nanobubbles. These nanobubbles are proven to be gas entities, by their response to application of pressure. The pressure at which the gas within the nanobubbles condenses is shifted to higher pressure due to the mechanical resistance of the lipid shell, which shields the bubble contents from up to ∼0.8 atm. of the external pressure The presence of lipids of low solubility at the nanobubble-solution interface effectively results in a negative Laplace pressure, which stabilizes these nanobubbles against dissolution.
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Affiliation(s)
- Muidh Alheshibri
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra ACT2600, Australia; Deanship of Preparatory Year and Supporting Studies, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 31441, Saudi Arabia.
| | - Vincent S J Craig
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra ACT2600, Australia.
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14
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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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15
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Kryuchkov NP, Khrapak SA, Yurchenko SO. Thermodynamics of two-dimensional Yukawa systems across coupling regimes. J Chem Phys 2018; 146:134702. [PMID: 28390340 DOI: 10.1063/1.4979325] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Thermodynamics of two-dimensional Yukawa (screened Coulomb or Debye-Hückel) systems is studied systematically using molecular dynamics (MD) simulations. Simulations cover very broad parameter range spanning from weakly coupled gaseous states to strongly coupled fluid and crystalline states. Important thermodynamic quantities, such as internal energy and pressure, are obtained and accurate physically motivated fits are proposed. This allows us to put forward simple practical expressions to describe thermodynamic properties of two-dimensional Yukawa systems. For crystals, in addition to numerical simulations, the recently developed shortest-graph interpolation method is applied to describe pair correlations and hence thermodynamic properties. It is shown that the finite-temperature effects can be accounted for by using simple correction of peaks in the pair correlation function. The corresponding correction coefficients are evaluated using MD simulation. The relevance of the obtained results in the context of colloidal systems, complex (dusty) plasmas, and ions absorbed to interfaces in electrolytes is pointed out.
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Affiliation(s)
- Nikita P Kryuchkov
- Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005 Moscow, Russia
| | - Sergey A Khrapak
- CNRS, PIIM, Aix Marseille University, Marseille, France; Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Oberpfaffenhofen, Germany; and Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
| | - Stanislav O Yurchenko
- Bauman Moscow State Technical University, 2nd Baumanskaya Str. 5, 105005 Moscow, Russia
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16
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Postnikov AV, Uvarov IV, Lokhanin MV, Svetovoy VB. Electrically controlled cloud of bulk nanobubbles in water solutions. PLoS One 2017; 12:e0181727. [PMID: 28727812 PMCID: PMC5519201 DOI: 10.1371/journal.pone.0181727] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Accepted: 07/06/2017] [Indexed: 12/03/2022] Open
Abstract
Using different experimental techniques we visualize a cloud of gas in water that is produced electrochemically by the alternating polarity process. Liquid enriched with gas does not contain bubbles strongly scattering visible light but its refractive index changes significantly near the electrodes. The change of the refractive index is a collective effect of bulk nanobubbles with a diameter smaller than 200 nm. Any alternative explanation fails to explain the magnitude of the effect. Spatial structure of the cloud is investigated with the optical lever method. Its dynamics is visualised observing optical distortion of the electrode images or using differential interference contrast method. The cloud covers concentric electrodes, in a steady state it is roughly hemispherical with a size two times larger than the size of the electrode structure. When the electrical pulses are switched off the cloud disappears in less than one second. The total concentration of gases can reach very high value estimated as 3.5 × 1020 cm−3 that corresponds to an effective supersaturation of 500 and 150 for hydrogen and oxygen, respectively.
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Affiliation(s)
- Alexander V. Postnikov
- Yaroslavl Branch of the Institute of Physics and Technology, Russian Academy of Sciencies, Yaroslavl, Russia
| | - Ilia V. Uvarov
- Yaroslavl Branch of the Institute of Physics and Technology, Russian Academy of Sciencies, Yaroslavl, Russia
| | - Mikhail V. Lokhanin
- Department of Physics, P. G. Demidov Yaroslavl State University, Yaroslavl, Russia
| | - Vitaly B. Svetovoy
- Yaroslavl Branch of the Institute of Physics and Technology, Russian Academy of Sciencies, Yaroslavl, Russia
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
- * E-mail:
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17
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Oh SH, Kim JM. Generation and Stability of Bulk Nanobubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3818-3823. [PMID: 28368115 DOI: 10.1021/acs.langmuir.7b00510] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Recently, extremely small bubbles, referred to as nanobubbles, have drawn increased attention due to their novel properties and great potential for various applications. In this study, a novel method for the generation of bulk nanobubbles (BNBs) was introduced, and stability of fabricated BNBs was investigated. BNBs were created from CO2 gas with a mixing method; the chemical identity and phase state of these bubbles can be determined via infrared spectroscopy. The presence of BNBs was observed with a nanoparticle tracking analysis (NTA). The ATR-FTIR spectra of BNBs indicate that the BNBs were filled with CO2 gas. Furthermore, the BNB concentration and its ζ-potential were about 2.94 × 108 particles/mL and -20 mV, respectively (24 h after BNB generation with a mixing time of 120 min). This indicates the continued existence and stability of BNBs in water for an extended period of time.
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Affiliation(s)
- Seung Hoon Oh
- School of Mechanical Engineering, Chung-Ang University , Seoul 156-756, Korea
| | - Jong-Min Kim
- School of Mechanical Engineering, Chung-Ang University , Seoul 156-756, Korea
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18
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Bunkin NF, Shkirin AV, Lyakhov GA, Kobelev AV, Penkov NV, Ugraitskaya SV, Fesenko EE. Droplet-like heterogeneity of aqueous tetrahydrofuran solutions at the submicrometer scale. J Chem Phys 2017; 145:184501. [PMID: 27846700 DOI: 10.1063/1.4966187] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A droplet formation in aqueous solutions of tetrahydrofuran (THF) has been experimentally detected at the submicrometer scale using two independent laser diagnostic techniques (dynamic light scattering and laser phase microscopy) and described in terms of THF-water intermolecular hydrogen bonding. It is shown that the nanodroplets have a mean size of 300 nm, their refractive index is higher than that of the ambient liquid, and they are highly enriched with THF molecules. The maximum of light scattering intensity falls within the THF concentration range 2-8 mol. %, which corresponds to the volume number density of the nanodroplets ∼1010-1011 cm-3. A theoretical explanation of forming the nanodroplets with a high content of THF, which is based on a model of dichotomous noise being applied to the so-termed "twinkling" hydrogen bonds and involves spinodal decomposition in the unstable region enclosed within the dichotomous binodal, is proposed. The parameters of hydrogen bonds in the molecular system "water-THF" were found, and the phase diagram of the solution with allowance for cross-linking hydrogen bonds was constructed.
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Affiliation(s)
- N F Bunkin
- Bauman State Technical University, 2nd Baumanskaya ul. 5, Moscow 105005, Russia
| | - A V Shkirin
- Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russia
| | - G A Lyakhov
- Prokhorov General Physics Institute, Russian Academy of Sciences, ul. Vavilova 38, Moscow 119991, Russia
| | - A V Kobelev
- Institute of Cell Biophysics, Russian Academy of Sciences, ul. Institutskaya 3, Pushchino, Moscow Region 142290, Russia
| | - N V Penkov
- Institute of Cell Biophysics, Russian Academy of Sciences, ul. Institutskaya 3, Pushchino, Moscow Region 142290, Russia
| | - S V Ugraitskaya
- Institute of Cell Biophysics, Russian Academy of Sciences, ul. Institutskaya 3, Pushchino, Moscow Region 142290, Russia
| | - E E Fesenko
- Institute of Cell Biophysics, Russian Academy of Sciences, ul. Institutskaya 3, Pushchino, Moscow Region 142290, Russia
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19
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Zhang M, Seddon JRT. Nanobubble-Nanoparticle Interactions in Bulk Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11280-11286. [PMID: 27480815 DOI: 10.1021/acs.langmuir.6b02419] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nanobubbles form stable colloids in supersaturated solutions. Here we demonstrate the ability of these solutions to interact with Au nanoparticle suspensions. The principle goal was to demonstrate particle modification, similar to froth flotation, and we do indeed see bubble-particle interactions. However, unlike in froth flotation, where bubble-particle interactions are driven mainly through collisions, for bulk nanobubble solutions we find that the principle interaction is through nucleation of new nanobubbles on the particles.
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Affiliation(s)
- Minmin Zhang
- Nanoionics Research Group & Mesa+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - James R T Seddon
- Nanoionics Research Group & Mesa+ Institute for Nanotechnology, University of Twente , P.O. Box 217, 7500 AE Enschede, The Netherlands
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20
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Alheshibri M, Qian J, Jehannin M, Craig VSJ. A History of Nanobubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11086-11100. [PMID: 27594543 DOI: 10.1021/acs.langmuir.6b02489] [Citation(s) in RCA: 232] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We follow the history of nanobubbles from the earliest experiments pointing to their existence to recent years. We cover the effect of Laplace pressure on the thermodynamic stability of nanobubbles and why this implies that nanobubbles are thermodynamically never stable. Therefore, understanding bubble stability becomes a consideration of the rate of bubble dissolution, so the dominant approach to understanding this is discussed. Bulk nanobubbles (or fine bubbles) are treated separately from surface nanobubbles as this reflects their separate histories. For each class of nanobubbles, we look at the early evidence for their existence, methods for the production and characterization of nanobubbles, evidence that they are indeed gaseous, or otherwise, and theories for their stability. We also look at applications of both surface and bulk nanobubbles.
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Affiliation(s)
- Muidh Alheshibri
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University , Canberra, ACT 2600, Australia
| | - Jing Qian
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University , Canberra, ACT 2600, Australia
| | - Marie Jehannin
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University , Canberra, ACT 2600, Australia
| | - Vincent S J Craig
- Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University , Canberra, ACT 2600, Australia
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21
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Yasui K, Tuziuti T, Kanematsu W, Kato K. Dynamic Equilibrium Model for a Bulk Nanobubble and a Microbubble Partly Covered with Hydrophobic Material. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11101-11110. [PMID: 26972826 DOI: 10.1021/acs.langmuir.5b04703] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The dynamic equilibrium model for a bulk nanobubble partly covered with hydrophobic material in water is theoretically and numerically studied. The gas diffusion into a bubble near the peripheral edge of the hydrophobic material on the bubble surface balances that out of the bubble from the other part of the uncovered bubble surface. In the present model, gas diffusion in quiescent liquid is assumed and there is no liquid flow. The total changes of energy and entropy are both zero as it is a kind of equilibrium state. The main origin of the dynamic equilibrium state is the gradient of chemical potential of gas near the peripheral edge of the hydrophobic material. It is caused by the permanent attractive potential of a hydrophobic material to gas molecules dissolved in liquid water as there is permanent repulsion of a hydrophobic material against liquid water. Thus, the gas supply will not terminate. It is numerically shown that stable nanobubble could be present when the fraction of surface coverage by hydrophobic material is from about 0.5 to 1. The stable size of a nanobubble changes with the liquid temperature as well as the degree of gas saturation of water. In slightly degassed water, not only a nanobubble but also a microbubble could be stable in mass balance when the fraction of surface coverage for a microbubble is on the order of 10-4 or less. For hydrophilic materials, however, a bubble could not be stable unless the fraction of the surface coverage is exactly 1. It is suggested that in many experiments of bulk nanobubbles there could be aggregates of nanobubbles.
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Affiliation(s)
- Kyuichi Yasui
- National Institute of Advanced Industrial Science and Technology (AIST) , 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
| | - Toru Tuziuti
- National Institute of Advanced Industrial Science and Technology (AIST) , 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
| | - Wataru Kanematsu
- National Institute of Advanced Industrial Science and Technology (AIST) , 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
| | - Kazumi Kato
- National Institute of Advanced Industrial Science and Technology (AIST) , 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
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22
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Yurchenko SO, Shkirin AV, Ninham BW, Sychev AA, Babenko VA, Penkov NV, Kryuchkov NP, Bunkin NF. Ion-Specific and Thermal Effects in the Stabilization of the Gas Nanobubble Phase in Bulk Aqueous Electrolyte Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11245-11255. [PMID: 27350310 DOI: 10.1021/acs.langmuir.6b01644] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Ion-stabilized nanobubbles in bulk aqueous solutions of various electrolytes were investigated. To understand the ion-specific mechanism of nanobubble stabilization, an approach based on the Poisson--Boltzmann equation at the nanobubble interface and in the near-surface layer was developed. It has been shown that the stabilization of nanobubbles is realized by the adsorption of chaotropic anions at the interface, whereas the influence of cosmotropic cations is weak. With increasing temperature, it should be accounted for by blurring the interface due to thermal fluctuations. As a result, the adsorbed state of ions becomes unstable: the nanobubble loses its stability and vanishes. This prediction was proven in our experiments. It turned out that in the case of liquid samples being kept in hermetically sealed ampules, where the phase equilibrium at the liquid-gas interface is fulfilled for any temperature, the volume number density of nanobubbles decreases with increasing temperature and this decrease is irreversible.
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Affiliation(s)
- Stanislav O Yurchenko
- Bauman Moscow State Technical University , Second Baumanskaya str. 5, Moscow, 105005 Russia
| | - Alexey V Shkirin
- A. M. Prokhorov General Physics Institute, Russian Academy of Sciences , Moscow, ul. Vavilova 38, 119991 Russia
- National Research Nuclear University MEPhI , Kashirskoe sh. 31, Moscow, 115409 Russia
| | - Barry W Ninham
- The Australian National University , Acton ACT 2601, Australia
| | - Andrey A Sychev
- Bauman Moscow State Technical University , Second Baumanskaya str. 5, Moscow, 105005 Russia
- P. N. Lebedev Physical Institute, Russian Academy of Sciences , Leninskiy prospekt 53, Moscow, 119991 Russia
| | - Vladimir A Babenko
- P. N. Lebedev Physical Institute, Russian Academy of Sciences , Leninskiy prospekt 53, Moscow, 119991 Russia
| | - Nikita V Penkov
- Institute of Cell Biophysics, Russian Academy of Sciences , Institutskaya ul. 3, Pushchino, Moscow Region, 142290 Russia
| | - Nikita P Kryuchkov
- Bauman Moscow State Technical University , Second Baumanskaya str. 5, Moscow, 105005 Russia
| | - Nikolai F Bunkin
- Bauman Moscow State Technical University , Second Baumanskaya str. 5, Moscow, 105005 Russia
- A. M. Prokhorov General Physics Institute, Russian Academy of Sciences , Moscow, ul. Vavilova 38, 119991 Russia
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23
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Snell JR, Zhou C, Carpenter JF, Randolph TW. Particle Formation and Aggregation of a Therapeutic Protein in Nanobubble Suspensions. J Pharm Sci 2016; 105:3057-3063. [PMID: 27488901 DOI: 10.1016/j.xphs.2016.06.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 06/08/2016] [Accepted: 06/17/2016] [Indexed: 10/21/2022]
Abstract
The generation of nanobubbles following reconstitution of lyophilized trehalose formulations has recently been reported. Here, we characterize particle formation and aggregation of recombinant human interleukin-1 receptor antagonist (rhIL-1ra) in reconstituted formulations of lyophilized trehalose. Particle characterization methods including resonant mass measurement and nanoparticle tracking analysis were used to count and size particles generated upon reconstitution of lyophilized trehalose formulations. In addition, accelerated degradation studies were conducted to monitor rhIL-1ra aggregation in solutions containing various concentrations of suspended nanobubbles. Reconstitution of lyophilized trehalose formulations with solutions containing rhIL-1ra reduced nanobubble concentrations and generated negatively buoyant particles attributed to aggregated rhIL-1ra. Furthermore, levels of rhIL-1ra aggregation following incubation in aqueous solution correlated with concentrations of suspended nanobubbles. The results of this study suggest that nanobubbles may be a contributor to protein aggregation and particle formation in reconstituted, lyophilized therapeutic protein formulations.
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Affiliation(s)
- Jared R Snell
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309
| | - Chen Zhou
- Department of Pharmaceutical Science, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - John F Carpenter
- Department of Pharmaceutical Science, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Theodore W Randolph
- Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309.
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24
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Bunkin NF, Shkirin AV, Suyazov NV, Babenko VA, Sychev AA, Penkov NV, Belosludtsev KN, Gudkov SV. Formation and Dynamics of Ion-Stabilized Gas Nanobubble Phase in the Bulk of Aqueous NaCl Solutions. J Phys Chem B 2016; 120:1291-303. [PMID: 26849451 DOI: 10.1021/acs.jpcb.5b11103] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ion-stabilized gas nanobubbles (the so-termed "bubstons") and their clusters are investigated in bulk aqueous solutions of NaCl at different ion concentrations by four independent laser diagnostic methods. It turned out that in the range of NaCl concentration 10(-6) < C < 1 M the radius of bubston remains virtually unchanged at a value of 100 nm. Bubstons and their clusters are a thermodynamically nonequilibrium phase, which has been demonstrated in experiments with magnetic stirrer at different stirring rates. Different regimes of the bubston generation, resulting from various techniques of processing the liquid samples, were explored.
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Affiliation(s)
- Nikolai F Bunkin
- Bauman Moscow State Technical University , second Baumanskaya 5, Moscow, 105005 Russia.,A.M. Prokhorov General Physics Institute, Russian Academy of Sciences , Moscow, ul. Vavilova 38, 119991 Russia
| | - Alexey V Shkirin
- A.M. Prokhorov General Physics Institute, Russian Academy of Sciences , Moscow, ul. Vavilova 38, 119991 Russia.,National Research Nuclear University MEPhI , Kashirskoe sh. 31, Moscow, 115409 Russia
| | - Nikolay V Suyazov
- A.M. Prokhorov General Physics Institute, Russian Academy of Sciences , Moscow, ul. Vavilova 38, 119991 Russia
| | - Vladimir A Babenko
- P. N. Lebedev Physical Institute, Russian Academy of Sciences , Leninskiy prospekt 53, Moscow, 119991 Russia
| | - Andrey A Sychev
- Bauman Moscow State Technical University , second Baumanskaya 5, Moscow, 105005 Russia.,P. N. Lebedev Physical Institute, Russian Academy of Sciences , Leninskiy prospekt 53, Moscow, 119991 Russia
| | - Nikita V Penkov
- Institute of Cell Biophysics, Russian Academy of Sciences , Institutskaya ul. 3, Pushchino, Moscow region, 142290 Russia
| | - Konstantin N Belosludtsev
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences , Institutskaya ul. 3, Pushchino, Moscow region, 142290 Russia
| | - Sergey V Gudkov
- A.M. Prokhorov General Physics Institute, Russian Academy of Sciences , Moscow, ul. Vavilova 38, 119991 Russia.,Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences , Institutskaya ul. 3, Pushchino, Moscow region, 142290 Russia.,Lobachevsky State University of Nizhni Novgorod , pr. Gagarina 23, Nizhni Novgorod, 603950 Russia
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25
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Yasui K, Tuziuti T, Kanematsu W, Kato K. Advanced dynamic-equilibrium model for a nanobubble and a micropancake on a hydrophobic or hydrophilic surface. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 91:033008. [PMID: 25871203 DOI: 10.1103/physreve.91.033008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Indexed: 06/04/2023]
Abstract
The dynamic-equilibrium model for stabilization of a nanobubble on a hydrophobic surface by Brenner and Lohse [M. P. Brenner and D. Lohse, Phys. Rev. Lett. 101, 214505 (2008)] has been modified taking into account the van der Waals attractive force between gas molecules inside a nanobubble and solid surface. The present model is also applicable to a nanobubble on a hydrophilic surface. According to the model, the pressure inside a nanobubble is not spatially uniform and is relatively higher near the solid surface. As a result, there is gas outflux near a hydrophilic surface, while near a hydrophobic surface there is gas influx which has been already suggested. In the present model, the radius of curvature for a nanobubble depends on the distance from the solid surface because the pressure depends on it. The shape of the micropancake, which is a nearly-two-dimensional bubble, is reproduced by the present model due to the strong dependence of the radius of curvature on the distance from the solid surface. The effect of temperature on the stability of a nanobubble or micropancake is also discussed.
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Affiliation(s)
- Kyuichi Yasui
- National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
| | - Toru Tuziuti
- National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
| | - Wataru Kanematsu
- National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
| | - Kazumi Kato
- National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan
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27
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Effects of nanobubbles on the physicochemical properties of water: The basis for peculiar properties of water containing nanobubbles. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2013.02.004] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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