Article
Chemistry, Physical
Mingbo Li, Xiaotong Ma, Julian Eisener, Patricia Pfeiffer, Claus-Dieter Ohl, Chao Sun
Summary: The stability of bulk nanobubbles is temperature-sensitive, with bubble size decreasing as temperature rises until reaching a minimum and then slightly increasing. This behavior is explained by a charge-stabilization mechanism, where nanobubbles lose charge at lower temperatures and maintain charge balance at higher temperatures.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Muye Feng, Xiaotong Ma, Zeyun Zhang, Kai H. Luo, Chao Sun, Xuefei Xu
Summary: This study investigates the effects of sodium chloride on the stability of a nitrogen bulk nanobubble in water using molecular dynamics simulations. The presence of NaCl is found to extend the lifetime of the nanobubble, and the underlying mechanisms are revealed. The hydration of ions plays a crucial role in the stability of the nanobubble by influencing the dynamics of hydrogen bonds and the diffusion properties of the system.
Article
Engineering, Chemical
Ananda J. Jadhav, Mostafa Barigou
Summary: Bulk nanobubbles were generated by electrolyzing aqueous solutions with different types of electrolytes, and the characteristics of the nanobubbles were influenced by operating parameters and electrolyte types. The stability and size of nanobubbles varied in different electrolyte solutions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Yuwen Ji, Zhen Guo, Tingyuan Tan, Yujiao Wang, Lijuan Zhang, Jun Hu, Yi Zhang
Summary: This study confirmed the generation of bulk nanobubbles in pure organic solutions, with the optimized parameters allowing the bubbles to stably exist for several hours in alcohol systems. These findings open up new opportunities for improving gas-liquid mass transfer efficiency in the chemical industry.
Review
Engineering, Chemical
Le Sun, Fenghua Zhang, Xiaoming Guo, Zhengming Qiao, Yi Zhu, Nuo Jin, Yan Cui, Weimin Yang
Summary: There are still fundamental problems in the basic research of bulk nanobubbles, including whether they are truly nanoscale bubbles or contaminants, and the stability mechanism that differs from the Epstein-Plesset theory. This paper discusses the contradiction between traditional theory predictions and observed lifetimes of bulk nanobubbles, examines the possibility of gas aggregates, and reviews existing models and conditions that influence their stability. Additionally, it provides guidance on production and characterization methods for the wide range of commercial applications of bulk nanobubbles.
Review
Chemistry, Physical
Beng Hau Tan, Hongjie An, Claus-Dieter Ohl
Summary: The existence and stability of nanoscopic gaseous domains in liquids, known as nanobubbles, have been debated due to classical theory predictions. However, through critical review and experiments, it has been proven that these gaseous domains not only exist but can also survive in liquid environments. Future research directions and unanswered questions remain for further exploration in this field.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Shaini Aluthgun Hewage, Jay N. Meegoda
Summary: The long-term stability of nanobubbles with high internal gas pressure is a puzzling question for researchers. Molecular Dynamics simulation was used to evaluate the performance of an oxygen nanobubble with high gas density. Results show that high initial gas concentration and density contribute to a more stable bubble condition. However, higher temperatures lead to faster gas diffusion and unstable internal pressure.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Multidisciplinary Sciences
Jeong Il Lee, Han Sol Huh, Joong Yull Park, Jung-Geun Han, Jong-Min Kim
Summary: In this study, BNBs were generated in water using a gas-liquid mixing method, and their coarsening behavior was investigated using NTA. The results showed that while the concentration of BNBs decreased, the total volume remained stable and the size distribution broadened.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Ananda J. Jadhav, Mostafa Barigou
Summary: The paper focuses on providing indirect evidence for the existence of bulk nanobubbles using various physical and chemical techniques, which require good experimental skills, sound protocols, and reliable equipment. Although no single piece of direct evidence is conclusive, combining multiple results provides strong support for the existence of bulk nanobubbles.
Review
Chemistry, Physical
Evangelos P. Favvas, George Z. Kyzas, Eleni K. Efthimiadou, Athanasios Ch Mitropoulos
Summary: The stability and longevity of nanobubbles, especially bulk nanobubbles, attract the attention of research groups worldwide, with a focus on developing new generation methods and exploring their potential high-value applications. While most methods of nanobubble generation are well understood, there is still a lack of detailed explanation regarding their formation process, special properties, and stability mechanisms.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Review
Chemistry, Physical
Fredrik Eklund, Muidh Alheshibri, Jan Swenson
Summary: It is challenging to differentiate between bulk nanobubbles and nanodroplets or nanoparticles, leading to misinterpretations in the literature. Experimental methods, including optical detection with physical perturbations or phase-sensitive holographic methods, are most promising for proving the existence of bulk nanobubbles.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Juncheng Qi, Qing Huang, Kaiwei Yuan, Hengxin Fang, Lijuan Zhang, Jun Hu
Summary: This study investigates the formation and evolution of nanobubbles in water during the freezing process. The results show that the cooling rate affects the size and number concentration of nanobubbles, with a higher cooling rate resulting in smaller size and lower number concentration. The study also reveals that increasing the dissolved gas content enhances nanobubble production, while freezing reduces the number concentration of preexisting nanobubbles.
Article
Chemistry, Physical
Hongguang Zhang, Shan Chen, Zhenjiang Guo, Xianren Zhang
Summary: In this study, molecular dynamics simulations were used to investigate the effect of surfactant-like molecules on the dissolution of bulk nanobubbles. The results show that the concentration of dissolved gas and the molecular structure of surfactants determine the stability of bulk nanobubbles. When the interfaces of nanobubbles are saturated with surfactants, the fate of the bubbles can either remain stable or be completely dissolved. As gas dissolves, the bubbles shrink and insoluble surfactants form a monolayer with increasing density until the surface tension reaches a very low level. The chemical structure of surfactants crucially affects the bubble stability by changing the elastic energy of the monolayer. Two basic conditions for stable nanobubbles at low gas saturation are identified: vanishing surface tension due to bubble dissolution and positive spontaneous curvature of the surfactant monolayer.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Shuo Wang, Limin Zhou, Yongxiang Gao
Summary: This study recalculated the electrostatic effect and found that the ratio of electrostatic pressure to Laplace pressure is much less than 10(-2), suggesting that electrostatic interaction may not be the main factor for stabilizing bulk nanobubbles.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Ananda J. Jadhav, Mostafa Barigou
Summary: Bulk nanobubbles, with an average diameter of around 100 nm, form stable clusters in pure water and exhibit different stability in different media. The study reveals that bulk nanobubbles tend to behave similarly to solid nanoparticles in terms of agglomeration tendency, which has significant implications for our understanding of their behavior and stability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Environmental
Renwu Zhou, Rusen Zhou, David Alam, Tianqi Zhang, Wenshao Li, Yang Xia, Anne Mai-Prochnow, Hongjie An, Emma C. Lovell, Hassan Masood, Rose Amal, Kostya Ken Ostrikov, Patrick J. Cullen
Summary: The study developed a Plasma Catalytic Bubble Column Reactor to efficiently treat water by delivering oxidative reactive species produced by plasma to the liquid phase. The addition of CeO2 catalysts enhanced the degradation of water contaminants, with improved performance and durability through plasma pre-activation. The integrated system demonstrated superior removal efficiency and kinetic constant compared to individual components, showing potential for water purification.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Pradip Singha, Nhat-Khuong Nguyen, Kamalalayam Rajan Sreejith, Hongjie An, Nam-Trung Nguyen, Chin Hong Ooi
Summary: Liquid marble is a non-wetting droplet coated with micro- or nanometer sized particles, showing potential applications in gas sensing, cell culture, and drug delivery. The thickness of the shell decreases significantly with the surface tension, while the mass remains almost constant. However, with further decrease in surface tension, both the thickness and the mass of the shell increase due to interfacial jamming.
ADVANCED MATERIALS INTERFACES
(2021)
Review
Chemistry, Physical
Beng Hau Tan, Hongjie An, Claus-Dieter Ohl
Summary: The existence and stability of nanoscopic gaseous domains in liquids, known as nanobubbles, have been debated due to classical theory predictions. However, through critical review and experiments, it has been proven that these gaseous domains not only exist but can also survive in liquid environments. Future research directions and unanswered questions remain for further exploration in this field.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Review
Chemistry, Physical
Beng Hau Tan, Hongjie An, Claus-Dieter Ohl
Summary: The passage discusses the characteristics of surface-attached nanobubbles, which are spherical cap-shaped gas bubbles that remain stable in size in saturated liquids. It also summarizes experimental techniques for recording their topography, softness, and chemical composition, as well as how to distinguish them from non-gaseous objects commonly found on surfaces in contact with liquids.
CURRENT OPINION IN COLLOID & INTERFACE SCIENCE
(2021)
Article
Chemistry, Analytical
Hui Ren, Zhixian Zhu, Nan Xiang, Hao Wang, Tingting Zheng, Hongjie An, Nam-Trung Nguyen, Jun Zhang
Summary: The multiplexed inertial microfluidic devices are proposed and developed for accurate isolation and detection of disseminated tumor cells from the malignant pleural effusion, showing promise for clinical applications due to their simple structure, high throughput, low cost, and good efficiency.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Biochemical Research Methods
Dan Yuan, Sharda Yadav, Hang T. Ta, Hedieh Fallahi, Hongjie An, Navid Kashaninejad, Chin Hong Ooi, Nam-Trung Nguyen, Jun Zhang
Summary: This study investigated sheathless viscoelastic focusing of particles and cells in a zigzag microfluidic channel, demonstrating its application on various types of particles and cells. The zigzag structure of the channel allows for reduced device footprint and channel length without sacrificing focusing performance.
Article
Nanoscience & Nanotechnology
Fariba Malekpour Galogahi, Yong Zhu, Hongjie An, Nam-Trung Nguyen
Summary: This paper reports experimental investigation of flow-focusing microfluidic devices capable of producing size-tuneable and monodisperse core-shell droplets, showing that the microchannel geometry is more significant than flow rates in controlling the droplet size.
MICROFLUIDICS AND NANOFLUIDICS
(2021)
Review
Biochemical Research Methods
Haotian Cha, Hedieh Fallahi, Yuchen Dai, Dan Yuan, Hongjie An, Nam-Trung Nguyen, Jun Zhang
Summary: Multiphysics microfluidics, which integrates multiple physical processes in a microfluidics platform, aims to overcome the limitations of individual phenomena and offers high precision and real-time tunability for cell manipulation. Reviewing the current research progress can provide insights into the advantages and future directions of multiphysics microfluidics.
Review
Environmental Sciences
Shui Cheung Edgar Leung, Pradeep Shukla, Dechao Chen, Ehsan Eftekhari, Hongjie An, Firuz Zare, Negareh Ghasemi, Dongke Zhang, Nam-Trung Nguyen, Qin Li
Summary: This review article focuses on the degradation methods for perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA). Various technologies, such as bioremediation, electrocoagulation, foam fractionation, sonolysis, photocatalysis, mechanochemical, and electrochemical degradation, have been developed and studied in recent years to address the PFAS crisis. However, challenges remain in terms of large-scale operation complexity and the release of toxic byproducts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Analytical
Yuchen Dai, Haotian Cha, Michael J. Simmonds, Hedieh Fallahi, Hongjie An, Hang T. Ta, Nam-Trung Nguyen, Jun Zhang, Antony P. McNamee
Summary: This study investigates the effects of altering fluid viscoelasticity on blood plasma extraction. Poly (ethylene oxide) (PEO) was added to increase blood viscoelasticity, resulting in improved cell focusing performance. The optimal PEO concentration was found to be in the range of 100 to 200 ppm, and the optimal flow rate was determined to be between 1 and 15 mu L/min.
Editorial Material
Physics, Multidisciplinary
Beng Hau Tan, Hongjie An, Claus-Dieter Ohl
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Analytical
Yuchen Dai, Haotian Cha, Nhat-Khuong Nguyen, Lingxi Ouyang, Fariba Galogahi, Ajeet Singh Yadav, Hongjie An, Jun Zhang, Chin Hong Ooi, Nam-Trung Nguyen
Summary: This study investigated the formation process of double emulsion under a dripping regime in a capillary device through experimental, analytical, and numerical methods. The results showed that mismatches between core and shell droplets can be captured experimentally and numerically. A semi-analytical model was proposed to describe the match ratio and the mismatch issue can be avoided if the ratio is lower than unity. The model with the wall effect predicted the size of the matched double emulsion and showed good agreement with experimental data under certain flow conditions.
Article
Physics, Multidisciplinary
Beng Hau Tan, Hongjie An, Claus -Dieter Ohl
Summary: This article investigates the role of line tension of a three-phase contact line in various interfacial phenomena and finds a significant discrepancy in existing measurements. The research suggests that the discrepancy is mainly caused by the failure of a commonly used estimation method to eliminate body forces, resulting in measured line tensions behaving like extensive quantities.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Nhat-Khuong Nguyen, Pradip Singha, Hongjie An, Hoang-Phuong Phan, Nam-Trung Nguyen, Chin Hong Ooi
Summary: This paper explores the use of electrostatic force to induce vibration and deformation in liquid marbles for improved mixing performance. Results demonstrate significant enhancement in mixing performance when they were actuated, with higher electric field strengths further promoting the mixing process. These findings highlight the potential of utilizing liquid marbles as high-performance micromixers through mechanisms of vibration and deformation.
REACTION CHEMISTRY & ENGINEERING
(2021)
