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Jonosono Y, Tsuda SI, Tokumasu T, Nagashima H. Molecular Dynamics Study of the Microscopic Mechanical Balance at the Three-Phase Contact Line of Interfacial Nanobubble. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:8440-8449. [PMID: 38604804 DOI: 10.1021/acs.langmuir.3c04027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
This study reveals the microscopic mechanical balance at the three-phase contact line (TPCL) of an interfacial nanobubble on a substrate with a wettability pattern using molecular dynamics simulations. The apparent contact angle was compared to that evaluated using Young's equation, in which the interfacial tensions were computed using a mechanical route. The comparison was conducted by changing the wettability of the substrate from hydrophilic to neutral while maintaining a hydrophobic region in the center of the substrate. When the wettability pattern pins the TPCL at the wettability boundary, the contact angle computed by Young's equation is larger than the apparent contact angle because a pinning force exists in the inward direction of the nanobubble. Conversely, on the surfaces where the wettability pattern does not pin the TPCL, the contact angle computed by Young's equation agrees with the apparent contact angle because the pinning force disappears. The distribution of principal stresses around the TPCL, which was visualized for the first time in this study, indicates that large compressive principal stresses exist between the liquid phase and the solid substrate interface, which pin the TPCL at the surface wettability boundary, and that the maximum principal stress occurs in the inward direction of the nanobubbles at the TPCL. The normalized pinning force estimated from the maximum principal stress is equivalent to that measured experimentally.
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Affiliation(s)
- Yusuke Jonosono
- Faculty of Engineering, University of the Ryukyus, 1, Senbaru, Nishihara-cho ,Okinawa 903-0213, Japan
| | - Shin-Ichi Tsuda
- Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Fukuoka 819-0395, Japan
| | - Takashi Tokumasu
- Institute of Fluid Science, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Hiroki Nagashima
- Faculty of Engineering, University of the Ryukyus, 1, Senbaru, Nishihara-cho ,Okinawa 903-0213, Japan
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Yen TH. Influence of gas aggregation on water-solid interface: molecular simulation. MOLECULAR SIMULATION 2020. [DOI: 10.1080/08927022.2020.1828881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Tsu-Hsu Yen
- Department of Marine Science, R.O.C. Naval Academy, Kaohsiung, Taiwan, Republic of China (R.O.C.)
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Alam SB, Yang J, Bustillo KC, Ophus C, Ercius P, Zheng H, Chan EM. Hybrid nanocapsules for in situ TEM imaging of gas evolution reactions in confined liquids. NANOSCALE 2020; 12:18606-18615. [PMID: 32970077 DOI: 10.1039/d0nr05281g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Liquid cell transmission electron microscopy (TEM) enables the direct observation of dynamic physical and chemical processes in liquids at the nanoscale. Quantitative investigations into reactions with fast kinetics and/or multiple reagents will benefit from further advances in liquid cell design that facilitate rapid in situ mixing and precise control over reagent volumes and concentrations. This work reports the development of inorganic-organic nanocapsules for high-resolution TEM imaging of nanoscale reactions in liquids with well-defined zeptoliter volumes. These hybrid nanocapsules, with 48 nm average diameter, consist of a thin layer of gold coating a lipid vesicle. As a model reaction, the nucleation, growth, and diffusion of nanobubbles generated by the radiolysis of water is investigated inside the nanocapsules. When the nanobubbles are sufficiently small (10-25 nm diameter), they are mobile in the nanocapsules, but their movement deviates from Brownian motion, which may result from geometric confinement by the nanocapsules. Gases and fluids can be transported between two nanocapsules when they fuse, demonstrating in situ mixing without using complex microfluidic schemes. The ability to synthesize nanocapsules with controlled sizes and to monitor dynamics simultaneously inside multiple nanocapsules provides opportunities to investigate nanoscale processes such as single nanoparticle synthesis in confined volumes and biological processes such as biomineralization and membrane dynamics.
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Affiliation(s)
- Sardar B Alam
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
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Li D, Zeng B, Wang Y. Probing the "Gas Tunnel" between Neighboring Nanobubbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15029-15037. [PMID: 31702925 DOI: 10.1021/acs.langmuir.9b02682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Surface nanobubbles are the main gaseous domains forming at solid-liquid interfaces, and their abnormally long lifetime (stability) is still an open question. A hypothesis "gas tunnel" was presented in a recent simulation study [ACS Nano 2018, 12 (3), 2603-2609], which was thought to connect two neighboring nanobubbles and make the nanobubbles remain stable. Herein, we aim to experimentally investigate the existence of gas tunnel and its role in governing nanobubble dynamics. By using an atomic force microscope, mutual effects between different gaseous domains including nanobubbles, nanopancakes, and nanobubble-pancake composite on a PS substrate undergoing violent tip perturbation and their effects on the undisturbed neighbors were investigated. The pancake between two nanobubbles can behave as a visible gas tunnel under the tip-bubble interaction. Based on statistical analysis of volume change in the different gas domains, the concept of a generalized gas tunnel is presented and experimentally verified. Nanobubbles are surrounded by a water depletion layer which will act as a channel along solid/liquid surfaces for adjacent nanobubbles to communicate with each other. Moreover, the change in contact angle of nanobubbles with the concentration of local gas oversaturation was studied, and the equilibrium contact angle of nanobubbles is further verified experimentally.
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Affiliation(s)
- Dayong Li
- School of Mechanical Engineering , Heilongjiang University of Science and Technology , No. 2468 Puyuan Road, Songbei district , Harbin 150022 , P. R. China
- Robotics Institute, School of Mechanical Engineering and Automation , Beihang University , No. 37 Xueyuan Road, Haidian district , Beijing 100191 , P. R. China
| | - Binglin Zeng
- Robotics Institute, School of Mechanical Engineering and Automation , Beihang University , No. 37 Xueyuan Road, Haidian district , Beijing 100191 , P. R. China
| | - Yuliang Wang
- Robotics Institute, School of Mechanical Engineering and Automation , Beihang University , No. 37 Xueyuan Road, Haidian district , Beijing 100191 , P. R. China
- Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , No. 37 Xueyuan Road, Haidian district , Beijing 100083 , P. R. China
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Shevkunov SV. Nucleation of Condensed Phase in Water Vapor on the Nanostructured Surface of a β-AgI Crystal. 2. Free Energy. COLLOID JOURNAL 2019. [DOI: 10.1134/s1061933x19010137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ke S, Xiao W, Quan N, Dong Y, Zhang L, Hu J. Formation and Stability of Bulk Nanobubbles in Different Solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:5250-5256. [PMID: 30909695 DOI: 10.1021/acs.langmuir.9b00144] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The existence of bulk nanobubbles is still controversial in spite of their significance in a large range of applications. Here, we developed a new method of compression-decompression to produce controllably bulk nanobubbles. Then, we further investigated the generation of bulk nanobubbles in pure water, acid, alkaline, and salt solutions using nanoparticle tracking analysis. The results indicated that the concentration of bulk nanobubbles depends on the decompression time and would reach a maximum value when the decompression time is about 30 min for the pure water system. More importantly, we gave a relatively direct evidence of the existence of bulk nanobubbles by measuring the X-ray fluorescence intensity of Kr in acid, alkaline, and salt solutions. It is shown that the decrease tendency in intensity of Kr in alkaline solution is similar to that in the concentration of bulk nanobubbles with the deposited time, indicating that the bulk nanobubbles produced indeed have gas inside. Furthermore, the concentration and stability of bulk nanobubbles in an alkaline solution are greatest compared with other two solutions regardless of gas types. The concentration of bulk nanobubbles will decrease in the order alkaline > acid/pure water > salt solutions. We believe that our results should be very helpful in understanding the formation and stability of bulk nanobubbles in different solutions.
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Affiliation(s)
- Shuo Ke
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Life and Environment Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Wei Xiao
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- School of Resources Engineering , Xi'an University of Architecture and Technology , Xi'an 710055 , China
| | - Nannan Quan
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Life and Environment Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Yaming Dong
- Life and Environment Science College , Shanghai Normal University , Shanghai 200234 , China
| | - Lijuan Zhang
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
| | - Jun Hu
- Shanghai Synchrotron Radiation Facility , Shanghai Advanced Research Institute, Chinese Academy of Sciences , Shanghai 201204 , China
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China
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Perera RT, Arcadia CE, Rosenstein JK. Probing the nucleation, growth, and evolution of hydrogen nanobubbles at single catalytic sites. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.07.063] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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