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Lei W, Chang S, Tian F, Zou X, Hu J, Qian S. Numerical simulation study on opening blood-brain barrier by ultrasonic cavitation. ULTRASONICS SONOCHEMISTRY 2024; 109:107005. [PMID: 39098097 PMCID: PMC11345312 DOI: 10.1016/j.ultsonch.2024.107005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 07/16/2024] [Accepted: 07/29/2024] [Indexed: 08/06/2024]
Abstract
Experimental studies have shown that ultrasonic cavitation can reversibly open the blood-brain barrier (BBB) to assist drug delivery. Nevertheless, the majority of the present study focused on experimental aspects of BBB opening. In this study, we developed a three-bubble-liquid-solid model to investigate the dynamic behavior of multiple bubbles within the blood vessels, and elucidate the physical mechanism of drug molecules through endothelial cells under ultrasonic cavitation excitation. The results showed that the large bubbles have a significant inhibitory effect on the movement of small bubbles, and the vibration morphology of intravascular microbubbles was affected by the acoustic parameters, microbubble size, and the distance between the microbubbles. The ultrasonic cavitation can significantly enhance the unidirectional flux of drug molecules, and the unidirectional flux growth rate of the wall can reach more than 5 %. Microjets and shock waves emitted from microbubbles generate different stress distribution patterns on the vascular wall, which in turn affects the pore size of the vessel wall and the permeability of drug molecules. The vibration morphology of microbubbles is related to the concentration, arrangement and scale of microbubbles, and the drug permeation impact can be enhanced by optimizing bubble size and acoustic parameters. The results offer an extensive depiction of the factors influencing the blood-brain barrier opening through ultrasonic cavitation, and the model may provide a potential technique to actively regulate the penetration capacity of drugs through endothelial layer of the neurovascular system by regulating BBB opening.
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Affiliation(s)
- Weirui Lei
- School of Physics and Electronics, Hunan Normal University, Changsha 410081, China
| | - Shuai Chang
- School of Physics and Electronics, Hunan Normal University, Changsha 410081, China
| | - Feng Tian
- School of Physics and Electronics, Hunan Normal University, Changsha 410081, China
| | - Xiao Zou
- School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
| | - Jiwen Hu
- School of Mathematics and Physics, University of South China, Hengyang 421001, China.
| | - Shengyou Qian
- School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
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2
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Cai L, Wu J, Zhang M, Wang K, Li B, Yu X, Hou Y, Zhao Y. Investigating the Potential of CO 2 Nanobubble Systems for Enhanced Oil Recovery in Extra-Low-Permeability Reservoirs. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:1280. [PMID: 39120385 PMCID: PMC11314192 DOI: 10.3390/nano14151280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2024] [Revised: 07/20/2024] [Accepted: 07/27/2024] [Indexed: 08/10/2024]
Abstract
Carbon Capture, Utilization, and Storage (CCUS) stands as one of the effective means to reduce carbon emissions and serves as a crucial technical pillar for achieving experimental carbon neutrality. CO2-enhanced oil recovery (CO2-EOR) represents the foremost method for CO2 utilization. CO2-EOR represents a favorable technical means of efficiently developing extra-low-permeability reservoirs. Nevertheless, the process known as the direct injection of CO2 is highly susceptible to gas scrambling, which reduces the exposure time and contact area between CO2 and the extra-low-permeability oil matrix, making it challenging to utilize CO2 molecular diffusion effectively. In this paper, a comprehensive study involving the application of a CO2 nanobubble system in extra-low-permeability reservoirs is presented. A modified nano-SiO2 particle with pro-CO2 properties was designed using the Pickering emulsion template method and employed as a CO2 nanobubble stabilizer. The suitability of the CO2 nanobubbles for use in extra-low-permeability reservoirs was evaluated in terms of their temperature resistance, oil resistance, dimensional stability, interfacial properties, and wetting-reversal properties. The enhanced oil recovery (EOR) effect of the CO2 nanobubble system was evaluated through core experiments. The results indicate that the CO2 nanobubble system can suppress the phenomena of channeling and gravity overlap in the formation. Additionally, the system can alter the wettability, thereby improving interfacial activity. Furthermore, the system can reduce the interfacial tension, thus expanding the wave efficiency of the repellent phase fluids. The system can also improve the ability of CO2 to displace the crude oil or water in the pore space. The CO2 nanobubble system can take advantage of its size and high mass transfer efficiency, among other advantages. Injection of the gas into the extra-low-permeability reservoir can be used to block high-gas-capacity channels. The injected gas is forced to enter the low-permeability layer or matrix, with the results of core simulation experiments indicating a recovery rate of 66.28%. Nanobubble technology, the subject of this paper, has significant practical implications for enhancing the efficiency of CO2-EOR and geologic sequestration, as well as providing an environmentally friendly method as part of larger CCUS-EOR.
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Affiliation(s)
| | - Jingchun Wu
- Key Laboratory for EOR Technology (Ministry of Education), Northeast Petroleum University, Daqing 163318, China; (L.C.); (M.Z.); (K.W.); (B.L.); (X.Y.); (Y.H.); (Y.Z.)
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3
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Hansen HHWB, Ouyang L, Cha H, Zhang J, Li Q, Tan BH, Vashi A, Nguyen NT, An H. Surface Cleaning of Oil Contaminants Using Bulk Nanobubbles. CHEMSUSCHEM 2024:e202400802. [PMID: 38966899 DOI: 10.1002/cssc.202400802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/19/2024] [Indexed: 07/06/2024]
Abstract
The removal of oil from solid surfaces, such as textiles and plates, remains a challenge due to the strong binding affinity of the oil. Conventional methods for surface cleaning often require surfactants and mechanical abrasion to enhance the cleaning process. However, in excess, these can pose adverse effects on the environment and to the material. This study investigated how bulk nanobubble water can clean oil microdroplets deposited on surfaces like glass coverslips and dishes. Microscopy imaging and further image analysis clearly revealed that these microdroplets detached from both hydrophobic and hydrophilic surfaces when washed with bulk nanobubble water within a fluidic microchannel. Oil contaminant cleaning was also conducted in water as mobile phase to mimic the circumstances that occur in a dishwasher and washing machine. Cleaning on a larger scale also proved very successful in the removal of oil from a porcelain bowl. These results indicate that nanobubble water can easily remove oil contaminants from glass and porcelain surfaces without the assistance of surfactants. This is in stark contrast to negligible results obtained with a control solution without nanobubbles. This study indicates that nanobubble technology is an innovative, low-cost, eco-friendly approach for oil removal, demonstrating its potential for broad practical applications.
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Affiliation(s)
- Helena H W B Hansen
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Lingxi Ouyang
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Haotian Cha
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Jun Zhang
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Engineering and Built Environment, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Qin Li
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Engineering and Built Environment, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Beng Hau Tan
- Shenzhen Institute of Advanced Study, University of Electronic Science and Technology of China, Shenzhen, 518110, China
| | - Aditya Vashi
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Nam-Trung Nguyen
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
| | - Hongjie An
- Queensland Micro- and Nanotechnology Centre, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
- School of Environment Science, Griffith University, 170 Kessel Road, Nathan, QLD 4111, Australia
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Singh E, Kumar A, Lo SL. Advancing nanobubble technology for carbon-neutral water treatment and enhanced environmental sustainability. ENVIRONMENTAL RESEARCH 2024; 252:118980. [PMID: 38657850 DOI: 10.1016/j.envres.2024.118980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Revised: 04/02/2024] [Accepted: 04/20/2024] [Indexed: 04/26/2024]
Abstract
Gaseous nanobubbles (NBs) with dimensions ranging from 1 to 1000 nm in the liquid phase have garnered significant interest due to their unique physicochemical characteristics, including specific surface area, low internal gas pressure, long-term stability, efficient mass transfer, interface potential, and free radical production. These remarkable properties have sparked considerable attention in the scientific community and industries alike. These hold immense promise for environmental applications, especially for carbon-neutral water remediation. Their long-lasting stability in aqueous systems and efficient mass transfer properties make them highly suitable for delivering gases in the vicinity of pollutants. This potential has prompted research into the use of NBs for targeted delivery of gases in contaminated water bodies, facilitating the degradation of harmful substances and advancing sustainable remediation practices. However, despite significant progress in understanding NBs physicochemical properties and potential applications, several challenges and knowledge gaps persist. This review thereby aims to summarize the current state of research on NBs environmental applications and potential for remediation. By discussing the generation processes, mechanisms, principles, and characterization techniques, it sheds light on the promising future of NBs in advancing environmental sustainability. It explores their role in improving oxygenation, aeration, and pollutant degradation in water systems. Finally, the review addresses future research perspectives, emphasizing the need to bridge knowledge gaps and overcome challenges to unlock the full potential of this frontier technology for enhanced environmental sustainability.
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Affiliation(s)
- Ekta Singh
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chuo-Shan Rd., Taipei, 10673, Taiwan
| | - Aman Kumar
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chuo-Shan Rd., Taipei, 10673, Taiwan
| | - Shang-Lien Lo
- Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chuo-Shan Rd., Taipei, 10673, Taiwan; Water Innovation, Low Carbon and Environmental Sustainability Research Center, National Taiwan University, Taipei, 10617, Taiwan; Science and Technology Research Institute for DE-Carbonization (STRIDE-C), National Taiwan University, Taipei, 10617, Taiwan.
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Yaparatne S, Morón-López J, Bouchard D, Garcia-Segura S, Apul OG. Nanobubble applications in aquaculture industry for improving harvest yield, wastewater treatment, and disease control. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 931:172687. [PMID: 38663593 DOI: 10.1016/j.scitotenv.2024.172687] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 04/03/2024] [Accepted: 04/20/2024] [Indexed: 05/09/2024]
Abstract
The ever-growing demand for aquaculture has led the industry to seek novel approaches for more sustainable practices. These attempts aim to increase aquaculture yield by increasing energy efficiency and decreasing footprint and chemical demand without compromising animal health. For this, emerging nanobubbles (NBs) aeration technology gained attention. NBs are gas-filled pockets suspended as sphere-like cavities (bulk NBs) or attached to surfaces (surface NBs) with diameters of <1 μm. Compared to macro and microbubbles, NBs have demonstrated unique characteristics such as long residence times in water, higher gas mass transfer efficiency, and hydroxyl radical production. This paper focuses on reviewing NB technology in aquaculture systems by summarizing and discussing uses and implications. Three focus areas were targeted to review the applicability and effects of NBs in aquaculture: (i) NBs aeration to improve the aquaculture harvest yield and subsequent wastewater treatment; (ii) NB application for inactivation of harmful microorganisms; and (iii) NBs for reducing oxidative stress and improving animal health. Thus, this study reviews the research studies published in the last 10 years in which air, oxygen, ozone, and hydrogen NBs were tested to improve gas mass transfer, wastewater treatment, and control of pathogenic microorganisms. The experimental results indicated that air and oxygen NBs yield significantly higher productivity, growth rate, total harvest, survival rate, and less oxygen consumption in fish and shrimp farming. Secondly, the application of air and ozone NBs demonstrated the ability of efficient pollutant degradation. Third, NB application demonstrated effective control of infectious bacteria and viruses, and thus increased fish survival, as well as different gene expression patterns that induce immune responses to infections. Reviewed studies lack robust comparative analyses of the efficacy of macro- and microbubble treatments. Also, potential health and safety implications, as well as economic feasibility through factors such as changes in capital infrastructure, routine maintenance and energy consumption need to be considered and evaluated in parallel to applicability. Therefore, even with a promising future, further studies are needed to confirm the benefits of NB treatment versus conventional aquaculture practices.
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Affiliation(s)
- Sudheera Yaparatne
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, United States
| | - Jesús Morón-López
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287, United States
| | - Deborah Bouchard
- Aquaculture Research Institute, University of Maine, Orono, ME 04469, United States
| | - Sergi Garcia-Segura
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287, United States
| | - Onur G Apul
- Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04469, United States.
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Liu W, Zheng F, Ma C, Xu W, Chen Y, Sha J. Single-Digit Nanobubble Sensing via Nanopore Technology. Anal Chem 2024; 96:9544-9550. [PMID: 38809167 DOI: 10.1021/acs.analchem.4c01035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Nanobubbles play an important role in diverse fields, including engineering, medicine, and agriculture. Understanding the characteristics of individual nanobubbles is essential for comprehending fluid dynamics behaviors and advancing nanoscale science across various fields. Here, we report a strategy based on nanopore sensors for characterizing single-digit nanobubbles. We investigated the sizes and diffusion coefficients of nanobubbles at different voltages. Additionally, the finite element simulation and molecular dynamics simulation were introduced to account for counterion concentration variation around nanobubbles in the nanopore. In particular, the differences in stability and surface charge density of nanobubbles under various solution environments have been studied by the ion-stabilized model and the DLVO theory. Additionally, a straightforward method to mitigate nanobubble generation in the bulk for reducing current noise in nanopore sensing was suggested. The results hold significant implications for enhancing the understanding of individual nanobubble characterizations, especially in the nanofluid field.
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Affiliation(s)
- Wei Liu
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
- Department of Chemistry & Chemical Engineering, Chalmers University of Technology, Gothenburg 41296, Sweden
| | - Fei Zheng
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
- Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
- School of Nanoscience and Nanotechnology, University of Chinese Academy of Sciences, Beijing 101408, China
| | - Chaofan Ma
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Wei Xu
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Yunfei Chen
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
| | - Jingjie Sha
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
- School of Mechanical Engineering, Southeast University, Nanjing 211189, China
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Hanafy MS, Abdella Ahmed AK, Salem RG. Impact of using XP-endo finisher and nanobubble water during EDTA dentin conditioning on TGF-β1 release in regenerative endodontic procedures. BMC Oral Health 2024; 24:595. [PMID: 38778321 PMCID: PMC11112901 DOI: 10.1186/s12903-024-04355-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 05/09/2024] [Indexed: 05/25/2024] Open
Abstract
INTRODUCTION Transforming Growth Factor-Beta 1 (TGF-β1) plays a crucial role in the success of Regenerative Endodontic Procedures (REPs) as they directly impact the proliferation and differentiation of stem cells. TGF-β1 is released by conditioning of the dentin matrix using 17% EDTA. EDTA was found to have deleterious effects on dentin especially in immature teeth with fragile dentin walls. Decreasing the irrigation time was reported to decrease these effects. Accordingly, enhancement and activation of the EDTA solution to maintain its efficiency in TGF-β1 release from dentin and thus compensating the reduction in irrigation time was employed. EDTA solution was enhanced by adding Nanobubble (NB) water which contains oxygen filled cavities less than 200 nm in diameter. Additionally, EDTA was activated with XP-endo Finisher rotary file. The aim of this study was to assess the impact of NB enhancement and/or XP-endo Finisher activation of the EDTA solution on the TGF-β1 release from dentin. METHODS Fifty standardized root segments with open apex were allocated to two main groups according to whether EDTA was enhanced with NB water or not, and within each group whether XP-endo Finisher activation was used or not in addition to a Negative Control group. The concentration of the released TGF-β1 in the root canal was measured using enzyme-linked immunosorbent assay (ELISA). The statistical analysis was done using the Shapiro- Wilk, Kolmogorov Smirnov, ANOVA and Post-hoc Tukey tests. RESULTS All groups released a considerable amount of TGF-β1 with the highest values in the EDTA/NB/XP group, followed by EDTA/NB, EDTA/DW/XP, EDTA/DW and Negative Control groups respectively. CONCLUSIONS The results of this study suggest that NBs can promote the success of REPs since it revealed a significant increase in the TGF-β1 release following its use in the enhancement of the EDTA solution. A comparable effect was obtained by XP-endo finisher activation of the EDTA solution. The combined use of NBs and XP-endo Finisher can be a promising addition in REPs. Accordingly, Enhancement and activation of the EDTA solution may compensate decreasing the EDTA irrigation time attempted to avoid the deleterious effect of EDTA on dentin.
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Affiliation(s)
- Mai Sayed Hanafy
- Endodontic Department, Faculty of Dentistry, Suez University, Suez, Egypt
| | | | - Rana Gehad Salem
- Pediatric Dentistry Department, Faculty of Oral and Dental Medicine, Badr University in Cairo, Cairo, Egypt.
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Jia N, Ma M, Wang X, Wang X, Ma J, Li Y, Li D. Indirect catalytic oxidation of multi-pollutants in diesel exhaust by ozone/micro-nano bubbles system. ENVIRONMENTAL TECHNOLOGY 2024; 45:2417-2426. [PMID: 36843385 DOI: 10.1080/09593330.2023.2174047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
Wet oxidation absorption is an efficient and promising method of exhaust gas treatment. When the micro-nano bubbles collapse, they can generate hydroxyl radicals with strong oxidising ability, which can oxidise a variety of pollutants in diesel exhaust. Ozone has strong oxidising properties, and the coupling of ozone and micro-nano bubbles can improve the oxidation and removal effects of polluted gases. In this study, the ozone micro-nano bubbles system was used to oxidise NOx, SO2, and CO to gases that were more readily dissolved in water, such as NO2, SO3, and CO2, and the gases were removed through the absorbent solution. The effects of surfactant, catalyst, urea, pH value, and salinity on the removal efficiency of NOx, SO2, and CO from diesel exhaust were investigated. Through experiments, it was found that the removal efficiency of pollutants was enhanced and then weakened with the increasing concentrations of surfactants, catalysts, and salinity, and continued to decrease with increasing concentrations of urea. When the pH value was < 7, the removal efficiency increased first and then weakened with the increase of the pH value. When the pH value was > 7, it mainly depended on the absorption of acid gas by the alkali solution. Under optimal conditions, the removal efficiencies were 86.3% for NO, 92.1% for SO2, and 65.4% for CO. This study could provide important theoretical support for the industrial application of this technology.
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Affiliation(s)
- Nan Jia
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Mengdie Ma
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Xing Wang
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Xi Wang
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Jingyi Ma
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Yongkuan Li
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Dengxin Li
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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Miller MA, Medina S. Life at the interface: Engineering bio-nanomaterials through interfacial molecular self-assembly. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2024; 16:e1966. [PMID: 38725255 PMCID: PMC11090466 DOI: 10.1002/wnan.1966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 04/18/2024] [Accepted: 04/20/2024] [Indexed: 05/15/2024]
Abstract
Interfacial self-assembly describes the directed organization of molecules and colloids at phase boundaries. Believed to be fundamental to the inception of primordial life, interfacial assembly is exploited by a myriad of eukaryotic and prokaryotic organisms to execute physiologic activities and maintain homeostasis. Inspired by these natural systems, chemists, engineers, and materials scientists have sought to harness the thermodynamic equilibria at phase boundaries to create multi-dimensional, highly ordered, and functional nanomaterials. Recent advances in our understanding of the biophysical principles guiding molecular assembly at gas-solid, gas-liquid, solid-liquid, and liquid-liquid interphases have enhanced the rational design of functional bio-nanomaterials, particularly in the fields of biosensing, bioimaging and biotherapy. Continued development of non-canonical building blocks, paired with deeper mechanistic insights into interphase self-assembly, holds promise to yield next generation interfacial bio-nanomaterials with unique, and perhaps yet unrealized, properties. This article is categorized under: Nanotechnology Approaches to Biology > Nanoscale Systems in Biology Therapeutic Approaches and Drug Discovery > Emerging Technologies.
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Affiliation(s)
- Michael A Miller
- Department of Biomedical Engineering, Pennsylvania State University, University Park, Pennsylvania, USA
| | - Scott Medina
- Department of Biomedical Engineering, Pennsylvania State University, University Park, Pennsylvania, USA
- Huck Institutes of the Life Sciences, Pennsylvania State University, University Park, Pennsylvania, USA
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Vega-Sánchez C, Neto C. Fluid Slip and Drag Reduction on Liquid-Infused Surfaces under High Static Pressure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:4460-4467. [PMID: 38359379 DOI: 10.1021/acs.langmuir.3c03792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
Liquid-infused surfaces (LIS) have been shown to reduce the huge frictional drag affecting microfluidic flow and are expected to be more robust than superhydrophobic surfaces when exposed to external pressure as the lubricant in LIS is incompressible. Here, we investigate the effect of applying static pressure on the effective slip length measured on Teflon wrinkled surfaces infused with silicone oil through pressure measurements in microfluidic devices. The effect of static pressure on LIS was found to depend on air content in the flowing water: for degassed water, the average effective slip length was beff = 2.16 ± 0.90 μm, irrespective of applied pressure. In gassed water, the average effective slip length was beff = 4.32 ± 1.06 μm at zero applied pressure, decreased by 55% to 2.37 ± 0.90 μm when the pressure was increased to 50 kPa, and then remained constant up to 200 kPa. The result is due to nanobubbles present on LIS, which are compressed or partially dissolved under pressure, and the effect is more evident when the size and portion of surface nanobubbles are higher. In contrast, on superhydrophobic wrinkles, the decline in beff was more sensitive to applied pressure, with beff = 6.8 ± 1.4 μm at 0 kPa and, on average, beff = -1 ± 3 μm for pressures higher than 50 kPa for both gassed and degassed water. Large fluctuations in the experimental measurements were observed on superhydrophobic wrinkles, suggesting the nucleation of large bubbles on the surface. The same pressure increase did not affect the flow on smooth substrates, on which gas nanobubbles were not observed. Contrary to expectations, we observed that drag reduction in LIS is affected by applied pressure, which we conclude is because, in a similar manner to superhydrophobic surfaces, they lose the interfacial gas, which lubricates the flow.
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Affiliation(s)
- Christopher Vega-Sánchez
- School of Electromechanical Engineering, Costa Rica Institute of Technology, Cartago 159-7050, Costa Rica
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
- University of Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Chiara Neto
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
- University of Sydney Nano Institute, The University of Sydney, Sydney, New South Wales 2006, Australia
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Taqieddin A, Sarrouf S, Ehsan MF, Alshawabkeh AN. New Insights on Designing the Next-Generation Materials for Electrochemical Synthesis of Reactive Oxidative Species Towards Efficient and Scalable Water Treatment: A Review and Perspectives. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2023; 11:111384. [PMID: 38186676 PMCID: PMC10769459 DOI: 10.1016/j.jece.2023.111384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Electrochemical water remediation technologies offer several advantages and flexibility for water treatment and degradation of contaminants. These technologies generate reactive oxidative species (ROS) that degrade pollutants. For the implementation of these technologies at an industrial scale, efficient, scalable, and cost-effective in-situ ROS synthesis is necessary to degrade complex pollutant mixtures, treat large amount of contaminated water, and clean water in a reasonable amount of time and cost. These targets are directly dependent on the materials used to generate the ROS, such as electrodes and catalysts. Here, we review the key design aspects of electrocatalytic materials for efficient in-situ ROS generation. We present a mechanistic understanding of ROS generation, including their reaction pathways, and integrate this with the key design considerations of the materials and the overall electrochemical reactor/cell. This involves tunning the interfacial interactions between the electrolyte and electrode which can enhance the ROS generation rate up to ~ 40% as discussed in this review. We also summarized the current and emerging materials for water remediation cells and created a structured dataset of about 500 electrodes and 130 catalysts used for ROS generation and water treatment. A perspective on accelerating the discovery and designing of the next generation electrocatalytic materials is discussed through the application of integrated experimental and computational workflows. Overall, this article provides a comprehensive review and perspectives on designing and discovering materials for ROS synthesis, which are critical not only for successful implementation of electrochemical water remediation technologies but also for other electrochemical applications.
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Affiliation(s)
- Amir Taqieddin
- Department of Mechanical & Industrial Engineering, Northeastern University, Boston, MA 02115
| | - Stephanie Sarrouf
- Department of Civil & Environmental Engineering, Northeastern University, Boston, MA 02115
| | - Muhammad Fahad Ehsan
- Department of Civil & Environmental Engineering, Northeastern University, Boston, MA 02115
| | - Akram N. Alshawabkeh
- Department of Civil & Environmental Engineering, Northeastern University, Boston, MA 02115
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Qi J, Huang Q, Yuan K, Fang H, Zhang L, Hu J. Evolution of Bulk Nanobubbles under Different Freezing Conditions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:16873-16880. [PMID: 37966887 DOI: 10.1021/acs.langmuir.3c02530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
The freezing process of aqueous solutions plays a crucial role in various applications including cryopreservation, glaciers, and frozen materials. However, less research has focused on the influence of nanoscale gas bubble formation or collapse in water during freezing, which may significantly impact the formation of ice crystals. Herein, we report for the first time that the freezing process can produce nanobubbles in aqueous solutions, and their size and number concentration could be changed by different cooling rates, i.e., the size would decrease as the cooling rate increased, and the maximum number concentration was found at the -80 °C system. Furthermore, increasing the dissolved gas content in the solution enhanced the production of nanobubbles, whereas for preexisting nanobubbles, the freezing resulted in a decrease in their number concentration, which was negatively correlated with the cooling rate. Our results indicated that a moderate cooling rate of -80 °C favored nanobubble generation, whereas a higher cooling rate was preferable for maintaining preexisting nanobubbles. Conversely, a lower cooling rate could be employed to eliminate preexisting nanobubbles. This study explored the evolution and stability of nanobubbles during the freezing process, providing valuable insights into the application or elimination of nanobubbles.
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Affiliation(s)
- Juncheng Qi
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qing Huang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Kaiwei Yuan
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hengxin Fang
- Research Institute of Interdisciplinary Sciences & School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, China
| | - Lijuan Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
| | - Jun Hu
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
- Xiangfu Laboratory, Jiashan 314102, China
- Institute of Materiobiology, Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China
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13
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Kouvalakidou SL, Varoutoglou A, Alibrahim KA, Alodhayb AN, Mitropoulos AC, Kyzas GZ. Batch adsorption study in liquid phase under agitation, rotation, and nanobubbles: comparisons in a multi-parametric study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:114032-114043. [PMID: 37855962 PMCID: PMC10663206 DOI: 10.1007/s11356-023-30342-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 10/04/2023] [Indexed: 10/20/2023]
Abstract
Concern for environmental protection has increased throughout the years from a global perspective. To date, the predominance of adsorption as treatment technique in environmental chemistry remains unchallenged. Moreover, the scientific attention for investigating nanobubbles due to their unique properties has turned the search for their application in environmental processes with special emphasis on water treatment. This study is aimed at investigating the effect of rotation on batch adsorption process using commercial activated carbon as adsorbent material, compared with the widely used method of agitation. As liquid medium, deionized water and deionized water enhanced with nanobubbles (of air) were used. The wastewater was simulated by dissolving a common dye as model pollutant, methylene blue, at concentration of 300 mg/L in the tested liquid. The results indicated that the utilization of nanobubbles resulted in an improvement on adsorption rate, compared to the corresponding values of deionized water solutions. These results may lead to promising applications in the future, since just 1 h of operation increases the water purification and thus provides a simply applied, cost-effective, and rapid alternative.
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Affiliation(s)
- Sofia L Kouvalakidou
- Hephaestus Laboratory, Department of Chemistry, International Hellenic University, GR-65404, Kavala, Greece
| | - Athanasios Varoutoglou
- Hephaestus Laboratory, Department of Chemistry, International Hellenic University, GR-65404, Kavala, Greece
| | - Khuloud A Alibrahim
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia
| | - Abdullah N Alodhayb
- Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Athanasios C Mitropoulos
- Hephaestus Laboratory, Department of Chemistry, International Hellenic University, GR-65404, Kavala, Greece
| | - George Z Kyzas
- Hephaestus Laboratory, Department of Chemistry, International Hellenic University, GR-65404, Kavala, Greece.
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Luukkonen T, Heponiemi A. Combination of peracetic acid dosing with diffused aeration in municipal wastewater treatment. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2023; 88:1087-1096. [PMID: 37651339 PMCID: wst_2023_262 DOI: 10.2166/wst.2023.262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Wastewater aeration is an important unit operation that provides dissolved oxygen for microorganisms in wastewater treatment. In this study, the impact of peracetic acid (PAA) dosing on wastewater aeration was assessed in terms of oxygen transfer, visual observation of bubble size changes, and evolution of dissolved oxygen from PAA (and H2O2) decomposition. Oxygen transfer coefficients improved with PAA concentrations of up to 7 mg/L, which was probably due to the smaller bubbles being formed from the aeration diffuser and evolution of small bubbles from PAA (and H2O2) decomposition. At a PAA concentration higher than 7 mg/L, the accumulation of acetate molecules to the gas-liquid interface of bubbles likely began to counteract the positive impact of bubble size decrease by increasing the mass transfer resistance of oxygen from bubbles to water. Finally, a continuous bench-scale primary effluent aeration experiment demonstrated that at a continuous PAA dosing of 1 mg/L, the air input by a compressor could be decreased by 54%, while keeping the oxygen level constant at approximately 1.5 mg/L. PAA dosing could be combined, for example, with aerated grit removal to enhance the primary effluent aeration together with additional benefits of partial disinfection and odor formation prevention.
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Affiliation(s)
- Tero Luukkonen
- Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 8000, FI-90014, Oulu, Finland E-mail:
| | - Anne Heponiemi
- Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 8000, FI-90014, Oulu, Finland
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15
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Paknahad AA, Zalloum IO, Karshafian R, Kolios MC, Tsai SSH. Microfluidic nanobubbles: observations of a sudden contraction of microbubbles into nanobubbles. SOFT MATTER 2023. [PMID: 37386867 DOI: 10.1039/d3sm00380a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/01/2023]
Abstract
Microfluidic devices are often utilized to generate uniform-size microbubbles. In most microfluidic bubble generation experiments, once the bubbles are formed the gas inside the bubbles begin to dissolve into the surrounding aqueous environment. The bubbles shrink until they attain an equilibrium size dictated by the concentration and type of amphiphilic molecules stabilizing the gas-liquid interface. Here, we exploit this shrinkage mechanism, and control the solution lipid concentration and microfluidic geometry, to make monodisperse bulk nanobubbles. Interestingly, we make the surprising observation of a critical microbubble diameter above and below which the scale of bubble shrinkage dramatically changes. Namely, microbubbles generated with an initial diameter larger than the critical diameter shrinks to a stable diameter that is consistent with previous literature. However, microbubbles that are initially smaller than the critical diameter experience a sudden contraction into nanobubbles whose size is at least an order-of-magnitude below expectations. We apply electron microscopy and resonance mass measurement methods to quantify the size and uniformity of the nanobubbles, and probe the dependence of the critical bubble diameter on the lipid concentration. We anticipate that further analysis of this unexpected microbubble sudden contraction regime can lead to more robust technologies for making monodisperse nanobubbles.
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Affiliation(s)
- Ali A Paknahad
- Department of Mechanical and Industrial Engineering, Toronto Metropolitan University, Toronto, Ontario M5B 2K3, Canada
- Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Toronto Metropolitan University and St. Michael's Hospital, Toronto, Ontario M5B 1T8, Canada
- Keenan Research Centre for Biomedical Science, Unity Health Toronto, Toronto, Ontario M5B 1W8, Canada
| | - Intesar O Zalloum
- Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Toronto Metropolitan University and St. Michael's Hospital, Toronto, Ontario M5B 1T8, Canada
- Keenan Research Centre for Biomedical Science, Unity Health Toronto, Toronto, Ontario M5B 1W8, Canada
- Department of Physics, Toronto Metropolitan University, Toronto, Ontario M5B 2K3, Canada.
| | - Raffi Karshafian
- Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Toronto Metropolitan University and St. Michael's Hospital, Toronto, Ontario M5B 1T8, Canada
- Keenan Research Centre for Biomedical Science, Unity Health Toronto, Toronto, Ontario M5B 1W8, Canada
- Department of Physics, Toronto Metropolitan University, Toronto, Ontario M5B 2K3, Canada.
| | - Michael C Kolios
- Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Toronto Metropolitan University and St. Michael's Hospital, Toronto, Ontario M5B 1T8, Canada
- Keenan Research Centre for Biomedical Science, Unity Health Toronto, Toronto, Ontario M5B 1W8, Canada
- Department of Physics, Toronto Metropolitan University, Toronto, Ontario M5B 2K3, Canada.
| | - Scott S H Tsai
- Department of Mechanical and Industrial Engineering, Toronto Metropolitan University, Toronto, Ontario M5B 2K3, Canada
- Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Toronto Metropolitan University and St. Michael's Hospital, Toronto, Ontario M5B 1T8, Canada
- Keenan Research Centre for Biomedical Science, Unity Health Toronto, Toronto, Ontario M5B 1W8, Canada
- Graduate Program in Biomedical Engineering, Toronto Metropolitan University, Toronto M5B 2K3, Canada.
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Babu KS, Amamcharla JK. Influence of Bulk Nanobubbles Generated by Acoustic Cavitation on Powder Microstructure and Rehydration Characteristics of Spray-Dried Milk Protein Concentrate Powders. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1093. [PMID: 36985987 PMCID: PMC10054697 DOI: 10.3390/nano13061093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 03/11/2023] [Accepted: 03/13/2023] [Indexed: 06/18/2023]
Abstract
Bulk nanobubbles (BNBs) have widespread applications in various fields of science due to numerous peculiar characteristics. Despite significant applications, only limited investigations are available on the application of BNBs in food processing. In the present study, a continuous acoustic cavitation technique was used to generate bulk nanobubbles (BNBs). The aim of this study was to evaluate the influence of BNB incorporation on the processability and spray drying of milk protein concentrate (MPC) dispersions. MPC powders were reconstituted to the desired total solids and incorporated with BNBs using acoustic cavitation as per the experimental design. The control MPC (C-MPC) and BNB-incorporated MPC (BNB-MPC) dispersions were analyzed for rheological, functional, and microstructural properties. The viscosity significantly decreased (p < 0.05) at all the amplitudes studied. The microscopic observations of BNB-MPC dispersions showed less aggregated microstructures and greater structural differences compared with C-MPC dispersions, therefore lowering the viscosity. The viscosity of BNB incorporated (90% amplitude) MPC dispersions at 19% total solids at a shear rate of 100 s-1 significantly decreased to 15.43 mPa·s (C-MPC: 201 mPa·s), a net decrease in viscosity by ~90% with the BNB treatment. The control and BNB incorporated MPC dispersions were spray-dried, and the resultant powders were characterized in terms of powder microstructure and rehydration characteristics. Focused beam reflectance measurement of the BNB-MPC powders indicated higher counts of fine particles (<10 μm) during dissolution, signifying that BNB-MPC powders exhibited better rehydration properties than the C-MPC powders. The enhanced powder rehydration with the BNB incorporation was attributed to the powder microstructure. Overall, reducing the viscosity of feed by BNB incorporation can enhance the performance of the evaporator. This study, therefore, recommends the possibility of using BNB treatment for more efficient drying while improving the functional properties of the resultant MPC powders.
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17
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Effect of bulk nanobubbles on ultrafiltration membrane performance: Physiochemical, rheological, and microstructural properties of the resulting skim milk concentrate dispersions. J FOOD ENG 2023. [DOI: 10.1016/j.jfoodeng.2022.111238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Dixit AK, Das AK. Molecular Approach for Understanding the Stability, Collision, and Coalescence of Bulk Nanobubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:16122-16133. [PMID: 36516486 DOI: 10.1021/acs.langmuir.2c02792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Though long-lived nanobubbles (NBs) have been reported by multiple researchers, the underlying reason behind their stability is still obscure. Some of the conjectured reasons include diffusive shielding, the presence of surface charges, and stability due to contamination. Still, the stability of NBs against coalescence and Ostwald ripening is not confirmed. Using molecular dynamics simulations, the present study aims to understand the stabilization effects due to diffusive shielding and the presence of an electrical double layer at the surface of NBs. Accumulation of charges on NBs for different concentrations of ions is discussed. Also, the collision of equal-sized NBs with different approach velocities and offset distances is simulated. A regime map is predicted on the basis of initial approach velocity and offset distance. The transition in regime obtained upon increasing the offset distance is discussed, which differs from the collision characteristics of macroscopic bubbles and drops. The merging of NBs is initiated through the bridge formation, for which the temporal evolution rate along with the scaling argument is presented. The stress terms involved and the corresponding regimes are predicted based on the fluid properties. For all the cases where merging is observed, the estimated probability is observed to be low, which suggests the stability of NBs against coalescence.
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Affiliation(s)
- Ayush K Dixit
- Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee247667, India
| | - Arup K Das
- Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee247667, India
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19
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Fundamentals and applications of nanobubbles: A review. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.11.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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20
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Horvat D, Agrež V, Požar T, Starman B, Halilovič M, Petkovšek R. Laser-induced shock-wave-expanded nanobubbles in spherical geometry. ULTRASONICS SONOCHEMISTRY 2022; 89:106160. [PMID: 36116244 PMCID: PMC9489810 DOI: 10.1016/j.ultsonch.2022.106160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 08/17/2022] [Accepted: 09/02/2022] [Indexed: 06/06/2023]
Abstract
The secondary cavitation generation following laser-induced breakdown in aqueous media in spherical geometry, mimicking the geometry of the frontal part of the human eye, was studied. A numerical simulation of the shock wave propagation was performed, yielding peak-pressure maps, correctly predicting the location of the secondary cavitation onset for different shock wave source positions. The comparison between the simulation results and the experiments, performed with a high-precision, multiple-illumination technique, supports the suggested description of the nature of the secondary cavitation onset. It is shown that large transient negative pressures are created at the location of the acoustic image of the shock wave source, which is different from the optical focus. After the passage of the shock wave, abundant secondary cavitation is generated there. Additionally, the existence of an important contributing factor to the reduction of the secondary cavitation threshold is supported by the experimental results, namely the pre-illumination of the water by the breakdown-generating laser pulse, playing a crucial role in conditioning the medium. There is strong experimental evidence of the existence of another mechanism of pre-conditioning the water for the secondary cavitation onset, namely in the form of repetitive negative pressure pulse passage through the same volume, an indication of a possible two- or multiple-stage process.
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Affiliation(s)
- Darja Horvat
- University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
| | - Vid Agrež
- University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
| | - Tomaž Požar
- University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
| | - Bojan Starman
- University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
| | - Miroslav Halilovič
- University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia
| | - Rok Petkovšek
- University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana, Slovenia.
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Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions. NANOMATERIALS 2022; 12:nano12152654. [PMID: 35957083 PMCID: PMC9370588 DOI: 10.3390/nano12152654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 11/26/2022]
Abstract
Micro-nanobubbles (MNBs) technology has emerged as an effective means of sewage treatment, while the molecular mechanism for its pollutant degradation is still unknown. In this paper, the reactive molecular dynamics simulation technique is used to study the degradation mechanism of pollutants caused by shock-induced nanobubble collapse. We first demonstrate that the propagating shock wave can induce nanobubble collapse, and the collapsing nanobubble has the ability to focus mechanical energy via the converging motion of liquid in the interior of the bubble, leading to the formation of a high-speed jet with a much higher energy density. We also unveil the mechanical nature of long-chain pollutant degradation and the mechanism of free radical generation. Due to the impacting jet, the high-gradient flow has the ability to stretch the long-chain molecule and cause mechanical scission of the molecule in a homolytic manner. Finally, our simulation results reveal that adding ozone molecules to the collapsing bubble would introduce an additional dehydrogenation mechanism.
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22
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Abstract
Ozone (O3) has been widely used for water and wastewater treatment due to its strong oxidation ability, however, the utilization efficiency of O3 is constrained by its low solubility and short half-life during the treatment process. Thereby, an integrated approach using novel nanobubble technology and ozone oxidation method was studied in order to enhance the ozonization of ammonia. Artificial wastewater (AW) with an initial concentration of 1600 mg/L ammonia was used in this study. In the ozone-nanobubble treatment group, the concentration of nano-sized bubbles was 2.2 × 107 particles/mL, and the bubbles with <200 nm diameter were 14 times higher than those in the ozone-macrobubble treatment control group. Ozone aeration was operated for 5 min in both nanobubble treatment and control groups, however, the sampling and measurement were conducted for 30 min to compare the utilization of O3 for ammonia oxidation. H+ was the by-product of the ammonia ozonation process, thus the pH decreased from 8 to 7 and 7.5 in nanobubble treatment and control groups, respectively, after 30 min of operation. The fast removal of ammonia was observed in both systems in the first 10 min, where the concentration of ammonia decreased from 1600 mg/L to 835 and 1110 mg/L in nanobubble treatment and control groups, respectively. In the nanobubble treatment group, ammonia concentrations kept the fast-decreasing trend and reached the final removal performance of 82.5% at the end of the experiment, which was significantly higher than that (44.2%) in the control group. Moreover, the first-order kinetic model could be used to describe the removal processes and revealed a significantly higher kinetic rate constant (0.064 min−1) compared with that (0.017 min−1) in the control group. With these results, our study highlights the viability of the proposed integrated approach to enhance the ozonation of a high level of ammonia in contaminated water.
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23
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Air nanobubbles induced reversible self-assembly of 7S globulins isolated from pea (Pisum Sativum L.). Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Zhang R, Gao Y, Chen L, Ge G. Controllable preparation of monodisperse nanobubbles by membrane sieving. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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25
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Babu KS, Amamcharla JK. Generation methods, stability, detection techniques, and applications of bulk nanobubbles in agro-food industries: a review and future perspective. Crit Rev Food Sci Nutr 2022; 63:9262-9281. [PMID: 35467989 DOI: 10.1080/10408398.2022.2067119] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Nanobubble (NB) technologies have received considerable attention for various applications due to their low cost, eco-friendliness, scale-up potential, process control, and unique physical characteristics. NB stands for nanoscopic gaseous cavities, typically <1 μm in diameter. NBs can exist on surfaces (surface or interfacial NBs) and be dispersed in a bulk liquid phase (bulk NBs). Compared to the microbubbles, NBs exhibit high specific surface area, negative surface charge, and better adsorption. Bulk NBs can be generated by hydrodynamic/acoustic cavitation, electrolysis, water-solvent mixing, nano-membrane filtration, and so on. NBs exhibit extraordinary longevity compared to microbubbles, prompting the interest of the scientific community aiming for potential applications including medicine, agriculture, food, wastewater treatment, surface cleaning, and so on. Based on the limited amount of research work available regarding the influence of NBs on food matrices, further research, however, needs to be done to provide more insights into its applications in food industries. This review provides an overview of the generation methods for NBs, techniques to evaluate them, and a discussion of their stability and several applications in various fields of science were discussed. However, recent studies have revealed that, despite the many benefits of NB technologies, several NB generating approaches are still limited in their application in specific agro-food industries. Further study should focus on process optimization, integrating various NB generation techniques/combining with other emerging technologies in order to achieve rapid technical progress and industrialization of NB-based technologies.HighlightsNanobubbles (NBs) are stable spherical entities of gas within liquid and are operationally defined as having diameters less than 1 µm.Currently, various reported theories still lack the ability to explain the evidence and stability of NBs in water, numerous NB applications have emerged due to the unique properties of NBs.NB technologies can be applied to various food and dairy products (e.g. yogurt and ice cream) and other potential applications, including agriculture (e.g. seed germination and plant growth), wastewater treatment, surface cleaning, and so on.
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Affiliation(s)
- Karthik S Babu
- Department of Animal Sciences and Industry/Food Science Institute, Kansas State University, Manhattan, Kansas, USA
| | - Jayendra K Amamcharla
- Department of Animal Sciences and Industry/Food Science Institute, Kansas State University, Manhattan, Kansas, USA
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26
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Recent Developments in Generation, Detection and Application of Nanobubbles in Flotation. MINERALS 2022. [DOI: 10.3390/min12040462] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This paper reviews recent developments in the fundamental understating of ultrafine (nano) bubbles (NBs) and presents technological advances and reagent types used for their generation in flotation. The generation of NBs using various approaches including ultrasonication, solvent exchange, temperature change, hydrodynamic cavitation, and electrolysis was assessed. Most importantly, restrictions and opportunities with respect to the detection of NBs were comprehensively reviewed, focusing on various characterization techniques such as the laser particle size analyzer (LPSA), nanoparticle tracking (NTA), dynamic light scattering (DLS), zeta-phase light scattering (ZPALS), and zeta sizer. As a key feature, types and possible mechanisms of surfactants applied to stabilize NBs were also explored. Furthermore, flotation-assisted nano-bubbles was reported as an efficient method for recovering minerals, with a special focus on flotation kinetics. It was found that most researchers reported the existence and formation of NBs by different techniques, but there is not enough information on an accurate measurement of their size distribution and their commonly used reagents. It was also recognized that a suitable method for generating NBs, at a high rate and with a low cost, remains a technical challenge in flotation. The application of hydrodynamic cavitation based on a venturi tube and using the LPSA and NTA in laboratory scales were identified as the most predominant approaches for the generation and detection of NBs, respectively. In this regard, neither pilot- nor industrial-scale case studies were found in the literature; they were only highlighted as future works. Although the NB-stabilizing effects of electrolytes have been well-explored, the mechanisms related to surfactants remain the issue of further investigation. The effectiveness of the NB-assisted flotation processes has been mostly addressed for single minerals, and only a few works have been reported for bulk materials. Finally, we believe that the current review paves the way for an appropriate selection of generating and detecting ultrafine bubbles and shines the light on a profound understanding of its effectiveness.
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Terán Hilares R, Singh I, Tejada Meza K, Colina Andrade GJ, Pacheco Tanaka DA. Alternative methods for cleaning membranes in water and wastewater treatment. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2022; 94:e10708. [PMID: 35365970 DOI: 10.1002/wer.10708] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
Membrane fouling is caused by foulant deposition or adsorption through physical or chemical interactions on the membrane surface, causing the reduction of flux through the membrane. The main drawbacks of chemical agents used for cleaning are cost, damage caused on the membrane, and waste stream making the process unattractive. Alternative, methods such as ultrasound, enzymatic process, and osmotic backwashing were explored for membrane cleaning. Among all mentioned methods, micronanobubbles have been reported as a promising and emergent method for membrane surface cleaning; unfortunately, the information is limited, but preliminary studies have shown it as an efficient, cheap, and environmentally friendly technique. Other methods like electrically and vibratory-enhanced membrane cleaning also could be interesting but currently are unexplored and information is limited. PRACTITIONER POINTS: Chemical cleaning is an efficient option; however, from an environmental point of view, it is not attractive, and high concentrations could cause damage to the membrane. Micronanobubbles are an emergent and suitable technology for membrane and surface cleaning. Membrane modification and functionalization avoid membrane fast fouling, and the cleaning process is easier, but the manufacture cost could be expensive.
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Affiliation(s)
- Ruly Terán Hilares
- Departamento de Ciencias e Ingenierías Biológicas y Químicas, Universidad Católica de Santa María (UCSM), Arequipa, Peru
| | - Imman Singh
- Rauschert Industries, Inc., Atlanta, Georgia, USA
| | - Kevin Tejada Meza
- Departamento de Ciencias e Ingenierías Biológicas y Químicas, Universidad Católica de Santa María (UCSM), Arequipa, Peru
| | - Gilberto J Colina Andrade
- Departamento de Ciencias e Ingenierías Biológicas y Químicas, Universidad Católica de Santa María (UCSM), Arequipa, Peru
| | - David Alfredo Pacheco Tanaka
- Departamento de Ciencias e Ingenierías Biológicas y Químicas, Universidad Católica de Santa María (UCSM), Arequipa, Peru
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Zhou S, Nazari S, Hassanzadeh A, Bu X, Ni C, Peng Y, Xie G, He Y. The effect of preparation time and aeration rate on the properties of bulk micro-nanobubble water using hydrodynamic cavitation. ULTRASONICS SONOCHEMISTRY 2022; 84:105965. [PMID: 35240410 PMCID: PMC8889407 DOI: 10.1016/j.ultsonch.2022.105965] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 02/10/2022] [Accepted: 02/23/2022] [Indexed: 05/11/2023]
Abstract
Fundamental research on bulk micro-nanobubbles (BMNBs) has grown rapidly due to the demand for their industrial applications and potential role in interfacial sciences. This work focuses on examining properties of such bubbles, including the number, concentration, zeta potential, and surface tension in water. For this purpose, BMNBs were generated by the hydrodynamic cavitation (HC) mechanism. Distilled water and air in the experiments were the liquid and gas phases, respectively. The characterization of bulk microbubbles (BMBs) and bulk nanobubbles (BNBs) were performed through focused beam reflectance measurement (FBRM) and nanoparticle tracking analysis (NTA) techniques, respectively. Zeta potential and surface tension of aqueous solutions were measured at different time and aeration rates. The results showed that aeration rate and preparation time had an important role in the properties of BNBs (concentration, bubble size, and surface charge) and BMBs (number, and bubble size). The instability of BMBs led to the rapid changes in the dissolved oxygen (DO) content in the water. The number of BMBs decreased when preparation time and aeration rate increased, but their size remained constant. By enhancing the preparation time and aeration rate, the concentration of BNBs improved first and then reduced. Additionally, the surface tension of an aqueous solution containing BNBs was significantly lower than that of pure water.
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Affiliation(s)
- Shaoqi Zhou
- Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Sabereh Nazari
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Ahmad Hassanzadeh
- Maelgwyn Mineral Services Ltd, Ty Maelgwyn, 1A Gower Road, Cathays, Cardiff CF24 4PA, United Kingdom; Department of Geoscience and Petroleum, Faculty of Engineering, Norwegian University of Science and Technology, Trondheim, Norway
| | - Xiangning Bu
- Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China.
| | - Chao Ni
- Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Yaoli Peng
- Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Guangyuan Xie
- Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), China University of Mining and Technology, Xuzhou 221116, China; School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Yaqun He
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
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Wang X, Yuan S, Liu J, Zhu Y, Han Y. Nanobubble-enhanced flotation of ultrafine molybdenite and the associated mechanism. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Raza F, Zafar H, Khan MW, Ullah A, Khan AU, Baseer A, Fareed R, Sohail M. Recent advances in the targeted delivery of paclitaxel nanomedicine for cancer therapy. MATERIALS ADVANCES 2022; 3:2268-2290. [DOI: 10.1039/d1ma00961c] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cancer cases have reached an all-time high in the current era.
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Affiliation(s)
- Faisal Raza
- School of Pharmacy, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Hajra Zafar
- School of Pharmacy, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | | | - Aftab Ullah
- Department of Pharmacy, Shantou University Medical College, Shantou, 515041, P. R. China
| | | | - Abdul Baseer
- Department of Pharmacy, Abasyn University, Peshawar, Pakistan
| | - Rameesha Fareed
- Riphah Institute of Pharmaceutical Sciences, Riphah International University Islamabad, Pakistan
| | - Muhammad Sohail
- School of Pharmacy, Yantai University, Shandong, 264005, China
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31
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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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32
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Paknahad AA, Kerr L, Wong DA, Kolios MC, Tsai SSH. Biomedical nanobubbles and opportunities for microfluidics. RSC Adv 2021; 11:32750-32774. [PMID: 35493576 PMCID: PMC9042222 DOI: 10.1039/d1ra04890b] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 09/19/2021] [Indexed: 12/17/2022] Open
Abstract
The use of bulk nanobubbles in biomedicine is increasing in recent years, which is attributable to the array of therapeutic and diagnostic tools promised by developing bulk nanobubble technologies. From cancer drug delivery and ultrasound contrast enhancement to malaria detection and the diagnosis of acute donor tissue rejection, the potential applications of bulk nanobubbles are broad and diverse. Developing these technologies to the point of clinical use may significantly impact the quality of patient care. This review compiles and summarizes a representative collection of the current applications, fabrication techniques, and characterization methods of bulk nanobubbles in biomedicine. Current state-of-the-art generation methods are not designed to create nanobubbles of high concentration and low polydispersity, both characteristics of which are important for several bulk nanobubble applications. To date, microfluidics has not been widely considered as a tool for generating nanobubbles, even though the small-scale precision and real-time control offered by microfluidics may overcome the challenges mentioned above. We suggest possible uses of microfluidics for improving the quality of bulk nanobubble populations and propose ways of leveraging existing microfluidic technologies, such as organ-on-a-chip platforms, to expand the experimental toolbox of researchers working to develop biomedical nanobubbles. The use of bulk nanobubbles in biomedicine is increasing in recent years. This translates into new opportunities for microfluidics, which may enable the generation of higher quality nanobubbles that lead to advances in diagnostics and therapeutics.![]()
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Affiliation(s)
- Ali A Paknahad
- Department of Mechanical and Industrial Engineering, Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada .,Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Ryerson University and St. Michael's Hospital 209 Victoria Street Toronto Ontario M5B 1T8 Canada.,Keenan Research Centre for Biomedical Science, Unity Health Toronto 209 Victoria Street Toronto Ontario M5B 1W8 Canada
| | - Liam Kerr
- Department of Mechanical and Industrial Engineering, Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada .,Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Ryerson University and St. Michael's Hospital 209 Victoria Street Toronto Ontario M5B 1T8 Canada.,Keenan Research Centre for Biomedical Science, Unity Health Toronto 209 Victoria Street Toronto Ontario M5B 1W8 Canada
| | - Daniel A Wong
- Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Ryerson University and St. Michael's Hospital 209 Victoria Street Toronto Ontario M5B 1T8 Canada.,Keenan Research Centre for Biomedical Science, Unity Health Toronto 209 Victoria Street Toronto Ontario M5B 1W8 Canada.,Department of Electrical, Computer, and Biomedical Engineering, Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada
| | - Michael C Kolios
- Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Ryerson University and St. Michael's Hospital 209 Victoria Street Toronto Ontario M5B 1T8 Canada.,Keenan Research Centre for Biomedical Science, Unity Health Toronto 209 Victoria Street Toronto Ontario M5B 1W8 Canada.,Department of Physics, Ryerson University Toronto Ontario M5B 2K3 Canada
| | - Scott S H Tsai
- Department of Mechanical and Industrial Engineering, Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada .,Institute for Biomedical Engineering, Science and Technology (iBEST), A Partnership Between Ryerson University and St. Michael's Hospital 209 Victoria Street Toronto Ontario M5B 1T8 Canada.,Keenan Research Centre for Biomedical Science, Unity Health Toronto 209 Victoria Street Toronto Ontario M5B 1W8 Canada.,Graduate Program in Biomedical Engineering, Ryerson University 350 Victoria Street Toronto Ontario M5B 2K3 Canada
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Kyzas GZ, Mitropoulos AC. From Bubbles to Nanobubbles. NANOMATERIALS 2021; 11:nano11102592. [PMID: 34685033 PMCID: PMC8540996 DOI: 10.3390/nano11102592] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 09/21/2021] [Accepted: 09/29/2021] [Indexed: 01/04/2023]
Abstract
Nanobubbles are classified into surface and bulk. The main difference between them is that the former is immobile, whereas the latter is mobile. The existence of sNBs has already been proven by atomic force microscopy, but the existence of bNBs is still open to discussion; there are strong indications, however, of its existence. The longevity of NBs is a long-standing problem. Theories as to the stability of sNBs reside on their immobile nature, whereas for bNBs, the landscape is not clear at the moment. In this preliminary communication, we explore the possibility of stabilizing a bNB by Brownian motion. It is shown that a fractal walk under specific conditions may leave the size of the bubble invariant.
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Antonio Cerrón-Calle G, Luna Magdaleno A, Graf JC, Apul OG, Garcia-Segura S. Elucidating CO 2 nanobubble interfacial reactivity and impacts on water chemistry. J Colloid Interface Sci 2021; 607:720-728. [PMID: 34536932 DOI: 10.1016/j.jcis.2021.09.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/04/2021] [Accepted: 09/06/2021] [Indexed: 11/28/2022]
Abstract
HYPOTHESIS Carbon dioxide nanobubbles can increase effective gas-transfer to solution and enhance buffering capacity given the stable suspension in water of CO2 gas within nanobubbles and the existence of larger gas/water interface. EXPERIMENTS The physico-chemical properties and responses of CO2 nanobubbles were recorded at different generation times (10, 30, 50, and 70 min) and benchmarked against traditional macrobubbles of CO2 for the same amount of delivered gas. Effective concentration of CO2 was evaluated by measuring the buffer capacity (β). The size distribution of nanobubbles during the experiments was measured by Nanoparticle Track Analysis. FINDINGS The mass transfer coefficient (KLa) showed a dramatically increase by 11-fold for the same volume of gas delivered when using nanobubbles. The β values obtained for nanobubbles were 7 times higher than that of traditional bubbles which can lead to significant source of CO2 availability by using the nanobubble method. Nanobubbles, consequently, undergo mass loss at higher pH corresponding to mass transfer process due to concentration gradient at the surrounding nanobubbles. This is the first report of CO2 nanobubbles buffer capacity evaluation.
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Affiliation(s)
- Gabriel Antonio Cerrón-Calle
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287-3005, USA
| | - Andre Luna Magdaleno
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287-3005, USA
| | - John C Graf
- NASA Johnson Space Center, Houston 77058, TX, United States
| | - Onur G Apul
- Department of Civil and Environmental Engineering, University of Maine, Orono 04469, ME, United States
| | - Sergi Garcia-Segura
- Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment, School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ 85287-3005, USA.
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Abstract
Attachment of particles and droplets to bubbles—the latter being of various fine sizes and created by different techniques (as described in detail)—forms the basis of flotation, a process which indeed was originated from mineral processing. Nevertheless, chemistry often plays a significant role in this area, in order for separation to be effective, as stressed. This (brief) review particularly discusses wastewater treatment applications and the effect of bubble size (from nano- to micro-) on the flotation process.
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36
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Kalogerakis N, Kalogerakis GC, Botha QP. Environmental applications of nanobubble technology: Field testing at industrial scale. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24211] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Nicolas Kalogerakis
- School of Environmental Engineering Technical University of Crete Chania Greece
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