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Computational study of laser fragmentation in liquid:Phase explosion,inverse Leidenfrost effect at the nanoscale,and evaporation in a nanobubble

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Science China(Physics,Mechanics & Astronomy) 2022年第7期65卷 99-114页

作者： Hao Huang Leonid V.Zhigilei School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Materials Science and Engineering University of VirginiaCharlottesville 22904-4745USA

Laser fragmentation in liquid is an effective and environment-friendly processing technique capable of yielding colloidal nanoparticles and atomic clusters with a narrow size distribution. The advancement of this technique can be facilitated by an improved understanding of processes that control the sizes, shapes, and structures of the produced nanoparticles. In this work, the dependence of the fragmentation mechanisms on the energy density deposited by the laser pulse is investigated in atomistic simulations performed for 20 nm Au nanoparticles irradiated in water by 10 ps laser pulses. The simulations reveal that the decrease in the absorbed laser energy leads to sequential transitions from the regime of “strong” phase explosion, when all products of an explosive phase decomposition of the irradiated nanoparticle are promptly injected into the water surrounding a nanobubble formed around the nanoparticle, to two distinct regimes of nanoparticle fragmentation leading to the formation of a large central nanoparticle surrounded by smaller satellite fragments. First, in the regime of “mild” phase explosion, the central nanoparticle is produced by the reflection of some of the hot metal droplets generated by the explosive decomposition of the nanoparticle from the boundary of the nanobubble. This reflection is attributed to the inverse Leidenfrost effect acting at the nanoscale. The reflected droplets converge in the center of the nanobubble and coalesce into a single droplet that solidifies shortly after the collapse of the nanobubble. Further decrease in the absorbed laser energy brings the irradiation conditions below the threshold for the phase explosion and results in the formation of a core-satellite structure of the fragmentation products through an interplay of the intense evaporation from the surface of the irradiated nanoparticle, evolution of the nanobubble, and condensation of the metal vapor into clusters and small satellite nanoparticles. The computationa

关键词： laser fragmentation in liquid molecular dynamics simulations phase explosion inverse Leidenfrost effect nanobubble nanoparticles

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nanobubble generation and its applications in froth flotation(part Ⅱ):fundamental study and theoretical analysis

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Mining Science and Technology 2010年第3期20卷 159-177页

作者： TAO Daniel HONAKER Rick Department of Mining Engineering University of Kentucky

Froth flotation is a commonly employed technology to improve the quality of raw coal and *** and minerals particle size and surface hydrophobicity are two main parameters that affect three key steps in froth flotation process:particle-bubble collision,adhesion,and *** paper fundamentally investigated the effects of nanobubble on coal and phosphate *** has been found that the presence of nanobubble in flotation pulp could widen the coal and phosphate flotation particle size range,increase the particle surface hydrophobicity,and thus improve the coal and phosphate froth flotation recovery.

关键词： coal phosphate froth flotation cavitation nanobubble Zeta potential

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Theoretical study on the stability of nanobubbles and its verification in molecular dynamics simulation

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Particuology 2024年第4期87卷 99-105页

作者： Sheng Mi Chaofeng Hou Wei Ge School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing.100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

The stability of vapor nanobubbles in bulk liquid was investigated theoretically and the critical bubble size was derived from macroscale thermodynamic equations,below which the system destabilizes with sharp drop in *** critical size was quantitatively verified in molecular dynamic simulation using the Lennard-Jones model of argon,where stronger attraction between the molecules at lower density is found to contribute most to the drop of system pressure and,as the Laplace pressure on the curved bubble interface fails to balance the pressure difference across the interface,the bubbles become *** theoretical model could be extended to other systems where reliable equations of state and interfacial tension are available.

关键词： nanobubble Stability Phase diagram Critical size

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Enhancement of Penaeus vannamei shrimp growth using nanobubble in indoor raceway pond

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Aquaculture and Fisheries 2021年第3期6卷 277-282页

作者： Asri Ifani Rahmawati Rizki Nugraha Saputra Arief Hidayatullah Agus Dwiarto Hardi Junaedi Dedi Cahyadi Henry Kasman Hadi Saputra Wendy Tri Prabowo Ujang Komarudin Asdani Kartamiharja Hanny Shafira Alfian Noviyanto Nurul Taufiqu Rochman nanobubble Karya Indonesia Ltd.Jl.Raya SerpongSouth TangerangBanten15314Indonesia Nano Center Indonesia Jl.Raya SerpongSouth TangerangBanten15314Indonesia Department of Agricultural Industry IPB UniversityJl.Raya DramagaBogorWest Java16680Indonesia Department of Aquaculture Vocational SchoolIPB UniversityJl.Kumbang 14BogorWest Java16680Indonesia Aquaculture Center for Brackish Water Situbondo Jl.Raya PecaronEast Java68351Indonesia Department of Mechanical Engineering Faculty of EngineeringMercu Buana UniversityJl.Meruya SelatanKebun JerukJakarta11650Indonesia Research Center for Metallurgy and Materials Indonesian Institute of SciencesPUSPIPTEKSouth TangerangBanten15314Indonesia

The effects of nanobubble on the growth environment,such as dissolved oxygen(DO)and total virus-bacteria,and growth performance,such as growth,feed conversion ratio(FCR),survival rate(SR),total harvest,and productivity,were investigated in Penaeus vannamei shrimp *** present study was carried out in 50 m2 indoor raceway ponds for 81 days with stocking density being set to 680 shrimp m􀀀3 in two types of treatment:nanobubble and diffuser aerator.A paddlewheel was used to distribute the oxygen saturation levels throughout the *** presence of nanoparticles was detected using a dynamic light scattering method and was reported to be 82.38 nm in size and􀀀26 mV for zeta potential *** was significantly higher under nanobubble *** virus-bacteria and FCR decreased,whereas SR,growth(weight and length),total harvest,and productivity increased with increasing *** SR was reported to reach 95%.The average weight and length of *** were 15.1±1.8 g and 13.1±1.1 cm,*** total harvest and productivity have doubled to 436 kg and 8.7 kg/*** results revealed that nanobubble has managed to maintain DO at the optimal range and affected the shrimp growth significantly(P<0.05).

关键词： nanobubble Penaeus vannamei Growth DO concentration

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Monitoring the Photocatalytic H2 Generation Activity of Single CdS Nanoparticles by Fluorescently Imaging the H2 nanobubble

Monitoring the Photocatalytic H2 Generation Activity of Sing...

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第十一届全国化学生物学学术会议

作者： Hua Su Yimin Fang Fangyuan Chen Wei Wang State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing University

The capability of semiconductor nanomaterials to convert solar energy to chemical energy has led to many promising applications,for instance,photocatalyzed H *** this important photocatalytic reaction at the single nanocatalyst level provides a great opportunity to understand the microscopic reaction kinetics and mechanism by overcoming the chemical and structural heterogeneity among ***,we developed a fluorescence(FL) labeling strategy to visualize individual H nanobubbles that are generated at single CdS nanoparticles during photocatalysis. In operando imaging of nanobubble growth kinetics allowed for determination of the photocatalytic activity of single nanocatalysts,which was found to randomly alternate among high activity,low activity and inactive *** nanomaterial-catalyzed gas generation is widely involved in many important reactions,this methodology is promising for the general applicability of single nanoparticle catalysis in broad basic and industrial fields.

关键词： Single nanoparticle catalysis Photocatalysis Hydrogen generation nanobubble

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nanobubbles produced by hydraulic air compression technique

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Chinese Physics B 2022年第5期31卷 459-463页

作者：杨晓东杨庆峰周利民张立娟胡钧 Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201204China Shanghai Tech University Shanghai 201210China University of Chinese Academy of Sciences Beijing 100049China

The anoxia of coastal water has already been a serious problem all over the *** are proved to have great applications in water remediation because they could effectively increase the oxygen content and degrade organic matters in *** the existing methods to produce nanobubbles are complicated and high cost to operate,especially in deep *** this paper,we presented a low-cost method,hydraulic air compression(HAC),to produce a large number of nanobubbles and proved that nanoscale gas bubbles could be produced by HAC for the first *** tracking analysis was used to measure the size and concentration of produced *** indicated that the concentration of nanobubbles would increase as the downpipe height *** measurements proved that produced“nanoparticles”are gas nanobubbles *** dissolved oxygen in water would provide the source for larger number of nanobubble *** results are expected to be very helpful for water remediation in ocean in the future.

关键词： nanobubble water remediation nanobubble generation dissolved oxygen hydraulic air compression

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An experimental study on size distribution and zeta potential of bulk cavitation nanobubbles

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 152-161页

作者： Xu-yu Zhang Qian-shuai Wang Zhong-xian Wu Dong-ping Tao School of Mining Engineering University of Science and Technology LiaoningAnshan 114051China School of Resources and Environmental Engineering Shandong University of TechnologyZibo 255049China

nanobubble flotation technology is an important research topic in the field of fine mineral particle *** basic characteristics of nanobubbles,including their size,concentration,surface zeta potential,and stability have a significant impact on the nanobubble flotation *** this paper,bulk nanobubbles generated based on the principle of hydrodynamic cavitation were investigated to determine the effects of different parameters(e.g.,surfactant(frother)dosage,air flow,air pressure,liquid flow rate,and solution pH value)on their size distribution and zeta potential,as measured using a nanoparticle *** results demonstrated that the nanobubble size decreased with increasing pH value,surfactant concentration,and cavitation-tube liquid flow rate but increased with increasing air pressure and increasing air flow *** magnitude of the negative surface charge of the nanobubbles was positively correlated with the pH value,and a certain relationship was observed between the zeta potential of the nanobubbles and their *** structural parameters of the cavitation tube also strongly affected the characteristics of the *** results of this study offer certain guidance for optimizing the nanobubble flotation technology.

关键词： nanobubble hydrodynamic cavitation zeta potential size distribution

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Concentration of nitrogen molecules needed by nitrogen nanobubbles existing in bulk water

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Applied Mathematics and Mechanics(English Edition) 2013年第12期34卷 1433-1438页

作者：张萌涂育松方海平 Shanghai Institute of Applied Physics Chinese Academy of Sciences Institute of Systems Biology Shanghai University

This paper investigates the stability of nitrogen nanobubbles under dif~ ferent concentrations of nitrogen molecules by molecular dynamics simulations. It is found that the stability of nanobubbles is very sensitive to the concentration of nitrogen molecules in water. A sharp transition between disperse states and assemble states of nitrogen molecules is observed when the concentration of nitrogen molecules is changed. The relevant critical concentration of nitrogen molecules needed by the existing nitrogen nanobubbles is analyzed.

关键词： nanobubble concentration stability

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Long lifetime of nanobubbles due to high inner density

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Science China(Physics,Mechanics & Astronomy) 2008年第2期51卷 219-224页

作者： ZHANG LiJuan CHEN Hao LI ZhaoXia FANG HaiPing HU Jun Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Graduate University of the Chinese Academy of Sciences Beijing 100080China Department of Physics Shanghai Jiao Tong UniversityShanghai 200030China Bio-X Life Science Research Center College of Life Science and BiotechnologyShanghai Jiao Tong UniversityShanghai 200030China

As predicted by classical macroscopic theory, the lifetime for nanoscale gas bub-bles is extremely short. However, stable gas nanobubbles have been experimen-tally observed in recent years. In this report, we theoretically show that, if the inner density of gas bubbles is sufficiently high, the lifetime of nanobubbles can increase by at least 4 orders of magnitude, and even approaches the timescale for experi-mental observations.

关键词： nanobubble stability long lifetime inner density

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Evolution of single nanobubbles through multi-state dynamics

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Chinese Chemical Letters 2020年第9期31卷 2442-2446页

作者： Huihui Wang Ting He Ying Du Wenhui Wang Yangbin Shen Shuping Li Xiaochun Zhou Feng Yang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China Suzhou Institute of Nano-tech and Nano-bionics Chinese Academy of Sciences(CAS).Suzhou 215123China Institute of Materials Science and Devices Suzhou University of Science and Technology.Suzhou 215009China Center for Integrated Nanotechnologies Los Alamos National LaboratoryLos AlamosNM 87544United States

nanobubble is a rising research field,which attracts more and more attentions due to its potential applications in medical science,catalysis,electrochemistry and *** better implement these applications,it is urgent to understand one of the most important mechanisms of nanobubbles,the ***,few attentions have been paid in this aspect because of the methodology *** we successfully used dark-field microscopy to study the evolution process of single nanobubbles generated from formic acid dehydrogenation on single Pd-Ag *** found some of the nanobubbles in this system can exhibit three distinct states representing different sizes,which can transform among each *** transitions are not direct but through some intermediate *** kinetic analysis reveals complicated mechanisms behind the evolution of single *** results acquired from this study can be applicable to nanobubble systems in general and provide insights into the understanding of mechanisms affecting the stability of nanobubbles and their applications.

关键词： nanobubble Single nanoparticle Catalysis Dark-field microscopy Intermediate state

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