1
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Zhou Y, Meng Y, Luo G, Chen B, Zhong D, Hu Y. Laser-Induced Stress-Driven Nanoplate Jumping Visualized by Ultrafast Electron Microscopy. ACS NANO 2024. [PMID: 39018251 DOI: 10.1021/acsnano.4c05717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2024]
Abstract
Understanding laser-induced jumping has attracted great interest in nanomaterial launching and transfer but requires a high spatiotemporal resolution visualization. Here, we report a jumping dynamics of nanoplate driven by ultrafast laser-induced stress using time-resolved transmission electron microscopy. Single-shot imaging reveals a nondestructive launching of gold nanoplates in several nanoseconds after the pulsed femtosecond laser excitation. The temperature rise and acoustic vibration, derived from ultrafast electron crystallography with a picosecond time resolution, confirm the existence of a laser-induced elastic stress wave. The generation, propagation, and reflection of thermal stress waves are further clarified by atomic simulation. The nonequilibrium ultrafast laser heating produces a compressive stress wave within several picoseconds, constrained by the supporting substrate under nanoplate to provide thrust force. This compressive stress is subsequently reflected into tensile stress by the substrate, promoting the nanoplate to jump off the substrate. Furthermore, the uneven interface adhesion results in the jumping flip of nanoplates, as well as, diminished their jumping speed. This study unveils the jumping regime driven by impulsive laser-excited stress and offers understanding of light-matter interaction.
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Affiliation(s)
- Yu Zhou
- State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yenan Meng
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Guohu Luo
- State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Bin Chen
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Dongping Zhong
- Center for Ultrafast Science and Technology, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yongxiang Hu
- State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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2
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Wan K, He J, Shi X. Construction of High Accuracy Machine Learning Interatomic Potential for Surface/Interface of Nanomaterials-A Review. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2305758. [PMID: 37640376 DOI: 10.1002/adma.202305758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/24/2023] [Indexed: 08/31/2023]
Abstract
The inherent discontinuity and unique dimensional attributes of nanomaterial surfaces and interfaces bestow them with various exceptional properties. These properties, however, also introduce difficulties for both experimental and computational studies. The advent of machine learning interatomic potential (MLIP) addresses some of the limitations associated with empirical force fields, presenting a valuable avenue for accurate simulations of these surfaces/interfaces of nanomaterials. Central to this approach is the idea of capturing the relationship between system configuration and potential energy, leveraging the proficiency of machine learning (ML) to precisely approximate high-dimensional functions. This review offers an in-depth examination of MLIP principles and their execution and elaborates on their applications in the realm of nanomaterial surface and interface systems. The prevailing challenges faced by this potent methodology are also discussed.
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Affiliation(s)
- Kaiwei Wan
- Laboratory of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
| | - Jianxin He
- Laboratory of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
| | - Xinghua Shi
- Laboratory of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, 100190, China
- University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China
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3
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Lin L, Xu CJ, Wang XD, Lee DJ. High-Temperature Wetting and Dewetting Dynamics of Silver Droplets on Molybdenum Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:1135-1144. [PMID: 36622857 DOI: 10.1021/acs.langmuir.2c02884] [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
The wetting and dewetting behaviors of Ag droplets on Mo(100), Mo(110), and Mo(111) surfaces were investigated over 1200-2000 K via molecular dynamics simulations. We used the diffusion energy barriers of Ag droplets on the three surfaces to analyze the phenomenon of different precursor films and adsorption layers on the different surfaces. Alloying enabled the Mo(111) surface better wettability in both Mo(110) and Mo(111) surfaces, where there were significant precursor films. We observed that the dewetting rate was the fastest on the surface with the densest adsorption layer. Simulations proved that the same molecular kinetic theory model was applicable to not only the wetting process but also the dewetting process on the same surface. We also provided evidence to support the fact that an increased temperature could reduce the time to reach equilibrium for the wetting and dewetting processes.
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Affiliation(s)
- Lin Lin
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing100083, People's Republic of China
| | - Chuan-Jiang Xu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing100083, People's Republic of China
| | - Xiao-Dong Wang
- Research Center of Engineering Thermophysics, North China Electric Power University, Beijing102206, People's Republic of China
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing102206, People's Republic of China
| | - Duu-Jong Lee
- Department of Mechanical Engineering, City University of Hong Kong, Kowloon Tong999077, Hong Kong Special Administrative Region of the People's Republic of China
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4
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Lu L, Zhu L, Liu X, Li J. Self-cleaning mechanisms and laws of hydrophilic or hydrophobic surfaces of solar photovoltaic glass. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2022.09.055] [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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5
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Afkhami S. Challenges of numerical simulation of dynamic wetting phenomena: a review. Curr Opin Colloid Interface Sci 2022. [DOI: 10.1016/j.cocis.2021.101523] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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6
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Effect of the External Velocity on the Exfoliation Properties of Graphene from Amorphous SiO2 Surface. CRYSTALS 2021. [DOI: 10.3390/cryst11040454] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
External action has a significant influence on the formation of high-quality graphene and the adhesion of graphene on the surface of the MEMS/NEMS device. The atomic-scale simulation and calculation can further study the exfoliation process of graphene by external actions. In multilayer graphene systems where graphene layers were simulated weakly contacted with SiO2 substrate, a constant vertical upward velocity (Vup) was applied to the topmost layer. Then two critical velocities were found, and three kinds of distinct exfoliation processes determined by critical upward velocities were observed in multilayer graphene systems. The first critical velocities are in the range of 0.5 Å/ps–3.18 Å/ps, and the second critical velocities are in the range of 9.5 Å/ps–12.1 Å/ps. When the Vup is less than the first critical velocity, all graphene layers will not be exfoliated. When Vup is between the first and second critical Vup, all layers can be exfoliated almost synchronously at last. When Vup is larger than the second critical Vup, the topmost layer can be exfoliated alone, transferring energy to the underlying layers, and the underlying layers are slowly exfoliated. The maximum exfoliation force to exfoliate the topmost layer of graphene is 3200 times larger than that of all graphene layers. Moreover, it is required 149.26 mJ/m2 to get monolayer graphene from multilayers, while peeling off all layers without effort. This study explains the difficulty to get monolayer graphene and why graphene falls off easily during the transfer process.
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7
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Surface, Interface, and Temperature Effects on the Phase Separation and Nanoparticle Self Assembly of Bi-Metallic Ni0.5Ag0.5: A Molecular Dynamics Study. NANOMATERIALS 2019; 9:nano9071040. [PMID: 31330888 PMCID: PMC6669487 DOI: 10.3390/nano9071040] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 07/10/2019] [Accepted: 07/19/2019] [Indexed: 11/16/2022]
Abstract
Classical molecular dynamics (MD) simulations were used to investigate how free surfaces, as well as supporting substrates, affect phase separation in a NiAg alloy. Bulk samples, droplets, and droplets deposited on a graphene substrate were investigated at temperatures that spanned regions of interest in the bulk NiAg phase diagram, i.e., miscible and immiscible liquid, liquid-crystal, and crystal-crystal regions. Using MD simulations to cool down a bulk sample from 3000 K to 800 K, it was found that phase separation below 2400 K takes place in agreement with the phase diagram. When free surface effects were introduced, phase separation was accompanied by a core-shell transformation: spherical droplets created from the bulk samples became core-shell nanoparticles with a shell made mostly of Ag atoms and a core made of Ni atoms. When such droplets were deposited on a graphene substrate, the phase separation was accompanied by Ni layering at the graphene interface and Ag at the vacuum interface. Thus, it should be possible to create NiAg core-shell and layer-like nanostructures by quenching liquid NiAg samples on tailored substrates. Furthermore, interesting bimetallic nanoparticle morphologies might be tuned via control of the surface and interface energies and chemical instabilities of the system.
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8
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Peng P, Li L, He P, Zhu Y, Fu J, Huang Y, Guo W. One-step selective laser patterning of copper/graphene flexible electrodes. NANOTECHNOLOGY 2019; 30:185301. [PMID: 30641487 DOI: 10.1088/1361-6528/aafe4c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Flexible electrodes have attracted much attention in consumer electronic applications. In this work, laser direct writing is used to fabricate copper/graphene composite electrodes on a flexible substrate in one step. This direct writing process with a low power laser can reduce copper ions in thin films to form copper nanomaterials and spontaneously interconnect them to gain good conductivity, while the laser also induces the growth of multi-layer graphene that coats on copper to improve the oxidation resistance of electrodes. The electrical performance and chemical composition of flexible electrodes can be tuned by laser power, scanning speed, and defocus distance. A mechanism of in situ reduction and interconnection of copper nanomaterials during laser direct writing has been proposed. This method could largely reduce the oxidation issue by avoiding synthesis and sintering processes of copper nanomaterials. These as-written copper electrodes have good stability and have potential applications in flexible electronics, such as flexible heaters or antennas as demonstrated.
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Affiliation(s)
- Peng Peng
- School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, People's Republic of China. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, People's Republic of China
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9
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Wang S, Wang C, Peng Z, Chen S. A new technique for nanoparticle transport and its application in a novel nano-sieve. Sci Rep 2018; 8:9682. [PMID: 29946132 PMCID: PMC6018662 DOI: 10.1038/s41598-018-28033-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Accepted: 06/12/2018] [Indexed: 11/09/2022] Open
Abstract
A new technique is proposed to transport and further classify nanoparticles of different sizes. A graphene sheet is used as the substrate; a nanoparticle is placed on the substrate and a sliding block is located below the substrate. As the sliding block moves under the graphene substrate, a driving force is yielded from the van der Waals interaction between the sliding block and the nanoparticle. The effects of the pre-tension of the graphene substrate, size and number of layers of the nanoparticle, slip velocity, the interface commensurability and temperature on nanoparticle transportation are systematically investigated. It is found that a pre-tensioned graphene substrate could provide easier nanoparticle transport. The initial movement of the nanoparticle depends on the competition between the in-plane force and the driving force, while the subsequent transport depends on the slip velocity of the sliding block and the viscous damping force. Based on such a new transport mechanism, a novel nano-sieve can be designed, with which nanoparticles of different sizes can be screened and classified spontaneously. Our findings may be useful for promising designs of transportation, manipulation and classification of nanoparticles.
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Affiliation(s)
- Shuai Wang
- LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chao Wang
- LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Zhilong Peng
- Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China
- Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing, 100081, China
| | - Shaohua Chen
- Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, 100081, China.
- Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing, 100081, China.
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10
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Cai H, Guo Y, Guo W. Friction induced structural transformations of water monolayers at graphene/Cu interfaces. Phys Chem Chem Phys 2018; 20:4137-4143. [DOI: 10.1039/c7cp08035b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The strong association of friction characteristics with structural transformations of water monolayers at graphene/Cu interfaces.
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Affiliation(s)
- Haifang Cai
- State Key Laboratory of Mechanics and Control of Mechanical Structures and MOE Key Laboratory for Intelligent Nano Materials and Devices
- College of Aerospace Engineering
- Nanjing University of Aeronautics and Astronautics
- Nanjing
- China
| | - Yufeng Guo
- State Key Laboratory of Mechanics and Control of Mechanical Structures and MOE Key Laboratory for Intelligent Nano Materials and Devices
- College of Aerospace Engineering
- Nanjing University of Aeronautics and Astronautics
- Nanjing
- China
| | - Wanlin Guo
- State Key Laboratory of Mechanics and Control of Mechanical Structures and MOE Key Laboratory for Intelligent Nano Materials and Devices
- College of Aerospace Engineering
- Nanjing University of Aeronautics and Astronautics
- Nanjing
- China
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11
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In-situ de-wetting assisted fabrication of spherical Cu-Sn alloy powder via the reduction of mixture metallic oxides. POWDER TECHNOL 2016. [DOI: 10.1016/j.powtec.2016.06.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Namsani S, Singh JK. Dewetting dynamics of a gold film on graphene: implications for nanoparticle formation. Faraday Discuss 2016; 186:153-70. [PMID: 26791560 DOI: 10.1039/c5fd00118h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The dynamics of dewetting of gold films on graphene surfaces is investigated using molecular dynamics simulation. The effect of temperature (973-1533 K), film diameter (30-40 nm) and film thickness (0.5-3 nm) on the dewetting mechanism, leading to the formation of nanoparticles, is reported. The dewetting behavior for films ≤5 Å is in contrast to the behavior seen for thicker films. The retraction velocity, in the order of ∼300 m s(-1) for a 1 nm film, decreases with an increase in film thickness, whereas it increases with temperature. However at no point do nanoparticles detach from the surface within the temperature range considered in this work. We further investigated the self-assembly behavior of nanoparticles on graphene at different temperatures (673-1073 K). The process of self-assembly of gold nanoparticles is favorable at lower temperatures than at higher temperatures, based on the free-energy landscape analysis. Furthermore, the shape of an assembled structure is found to change from spherical to hexagonal, with a marked propensity towards an icosahedral structure based on the bond-orientational order parameters.
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Affiliation(s)
- Sadanandam Namsani
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur-2018016, India.
| | - Jayant K Singh
- Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur-2018016, India.
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13
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van den Beld WTE, van den Berg A, Eijkel JCT. Spatial control of direct chemical vapor deposition of graphene on silicon dioxide by directional copper dewetting. RSC Adv 2016. [DOI: 10.1039/c6ra16935j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A non-manual, controllable and wafer-scale method for the spatial control of direct graphene synthesis onto silicon dioxide by controlled dewetting and evaporation of copper.
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Affiliation(s)
- Wesley T. E. van den Beld
- BIOS – Lab on a Chip Group
- MESA+ Institute for Nanotechnology
- MIRA Institute for Biomedical Engineering and Technical Medicine
- University of Twente
- The Netherlands
| | - Albert van den Berg
- BIOS – Lab on a Chip Group
- MESA+ Institute for Nanotechnology
- MIRA Institute for Biomedical Engineering and Technical Medicine
- University of Twente
- The Netherlands
| | - Jan C. T. Eijkel
- BIOS – Lab on a Chip Group
- MESA+ Institute for Nanotechnology
- MIRA Institute for Biomedical Engineering and Technical Medicine
- University of Twente
- The Netherlands
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14
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Lei C, Huang H, Cheng Z, Tang S, Du Y. Fabrication of spherical Fe-based magnetic powders via the in situ de-wetting of the liquid–solid interface. RSC Adv 2016. [DOI: 10.1039/c5ra22609k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We developed a new liquid–solid interface method for the fabrication of spherical Fe-based alloy particles, which in situ de-wets from the graphite surface without pores and bulk inclusions.
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Affiliation(s)
- Chenglong Lei
- Jiangsu key laboratory for nanotechnology
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing National Laboratory of Microstructures and Department of Physics
- Nanjing University
- Nanjing 210093
| | - Haifu Huang
- Jiangsu key laboratory for nanotechnology
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing National Laboratory of Microstructures and Department of Physics
- Nanjing University
- Nanjing 210093
| | - Zhenzhi Cheng
- Jiangsu key laboratory for nanotechnology
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing National Laboratory of Microstructures and Department of Physics
- Nanjing University
- Nanjing 210093
| | - Shaolong Tang
- Jiangsu key laboratory for nanotechnology
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing National Laboratory of Microstructures and Department of Physics
- Nanjing University
- Nanjing 210093
| | - Youwei Du
- Jiangsu key laboratory for nanotechnology
- Collaborative Innovation Center of Advanced Microstructures
- Nanjing National Laboratory of Microstructures and Department of Physics
- Nanjing University
- Nanjing 210093
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15
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Wettability and Coalescence of Cu Droplets Subjected to Two-Wall Confinement. Sci Rep 2015; 5:15190. [PMID: 26459952 PMCID: PMC4602311 DOI: 10.1038/srep15190] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 09/21/2015] [Indexed: 01/02/2023] Open
Abstract
Controlling droplet dynamics via wettability or movement at the nanoscale is a significant goal of nanotechnology. By performing molecular dynamics simulations, we study the wettability and spontaneous coalescence of Cu droplets confined in two carbon walls. We first focus on one drop in the two-wall confinement to reveal confinement effects on wettability and detaching behavior of metallic droplets. Results show that Cu droplets finally display three states: non-detachment, semi-detachment and full detachment, depending on the height of confined space. The contact angle ranges from 125° to 177°, and the contact area radius ranges from 12 to ~80 Å. The moving time of the detached droplet in the full detachment state shows a linear relationship with the height of confined space. Further investigations into two drops subjected to confinement show that the droplets, initially distant from each other, spontaneously coalesce into a larger droplet by detachment. The coalescing time and final position of the merged droplet are precisely controlled by tailoring surface structures of the carbon walls, the height of the confined space or a combination of these approaches. These findings could provide an effective method to control the droplet dynamics by confinement.
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16
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Horne JE, Lavrik NV, Terrones H, Fuentes-Cabrera M. Extrapolating Dynamic Leidenfrost Principles to Metallic Nanodroplets on Asymmetrically Textured Surfaces. Sci Rep 2015; 5:11769. [PMID: 26123648 PMCID: PMC4485316 DOI: 10.1038/srep11769] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 05/22/2015] [Indexed: 11/22/2022] Open
Abstract
In an effort to enhance our knowledge on how to control the movement of metallic nanodroplets, here we have used classical molecular dynamics simulations to investigate whether Cu nanostructures deposited on nanopillared substrates can be made to jump at desired angles. We find that such control is possible, especially for Cu nanostructures that are symmetric; for asymmetric nanostructures, however, control is more uncertain. The work presented here borrows ideas from two seemingly different fields, metallic droplets and water droplets in the dynamic Leidenfrost regime. Despite the differences in the respective systems, we find common ground in their behavior on nanostructured surfaces. Due to this, we suggest that the ongoing research in Leidenfrost droplets is a fertile area for scientists working on metallic nanodroplets.
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Affiliation(s)
- Joseph E Horne
- Department of Physics, Applied Physics &Astronomy, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, 12180 NY, USA
| | - Nickolay V Lavrik
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
| | - Humberto Terrones
- Department of Physics, Applied Physics &Astronomy, Rensselaer Polytechnic Institute, 110 Eighth Street, Troy, 12180 NY, USA
| | - Miguel Fuentes-Cabrera
- 1] Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA [2] Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA
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17
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Wu Y, Dong N, Fu S, Fowlkes JD, Kondic L, Vincenti MA, de Ceglia D, Rack PD. Directed liquid phase assembly of highly ordered metallic nanoparticle arrays. ACS APPLIED MATERIALS & INTERFACES 2014; 6:5835-5843. [PMID: 24689648 DOI: 10.1021/am500695h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Directed assembly of nanomaterials is a promising route for the synthesis of nanoscale materials. In this paper, we demonstrate the directed-assembly of highly ordered two-dimensional arrays of hierarchical nanostructures with tunable size, spacing and composition. The directed assembly is achieved on lithographically patterned metal films that are subsequently pulse-laser melted; during the brief liquid lifetime, the pattened nanostructures assemble into highly ordered primary and secondary nanoparticles, with sizes below that which was originally patterned. Complementary fluid-dynamics simulations emulate the resultant patterns and show how the competition of capillary forces and liquid metal-solid substrate interaction potential drives the directed assembly. As an example of the enhanced functionality, a full-wave electromagnetic analysis has been performed to identify the nature of the supported plasmonic resonances.
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Affiliation(s)
- Yueying Wu
- Department of Materials Science and Engineering, The University of Tennessee , Knoxville, Tennessee 37996, United States
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18
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Polyakov B, Vlassov S, Dorogin LM, Novoselska N, Butikova J, Antsov M, Oras S, Lohmus R, Kink I. Some aspects of formation and tribological properties of silver nanodumbbells. NANOSCALE RESEARCH LETTERS 2014; 9:186. [PMID: 24872795 PMCID: PMC4022052 DOI: 10.1186/1556-276x-9-186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 04/02/2014] [Indexed: 05/31/2023]
Abstract
UNLABELLED In this paper, metal nanodumbbells (NDs) formed by laser-induced melting of Ag nanowires (NWs) on an oxidized silicon substrate and their tribological properties are investigated. The mechanism of ND formation is proposed and illustrated with finite element method simulations. Tribological measurements consist in controllable real-time manipulation of NDs inside a scanning electron microscope (SEM) with simultaneous force registration. The geometry of NDs enables to distinguish between different types of motion, i.e. rolling, sliding and rotation. Real contact areas are calculated from the traces left after the displacement of NDs and compared to the contact areas predicted by the contact mechanics and frozen droplet models. PACS 81.07.-b; 62.25.-g; 62.23.Hj.
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Affiliation(s)
- Boris Polyakov
- Institute of Solid State Physics, University of Latvia, Kengaraga str. 8, Riga LV-1063, Latvia
| | - Sergei Vlassov
- Institute of Solid State Physics, University of Latvia, Kengaraga str. 8, Riga LV-1063, Latvia
| | - Leonid M Dorogin
- Institute of Physics, University of Tartu, Riia str. 142, Tartu 51014, Estonia
- Estonian Nanotechnology Competence Center, Riia str. 142, Tartu 51014, Estonia
| | - Natalia Novoselska
- I.I.Mechnikov Odessa National University, Dvoryanskaya str. 2, Odessa 65082, Ukraine
| | - Jelena Butikova
- Institute of Solid State Physics, University of Latvia, Kengaraga str. 8, Riga LV-1063, Latvia
| | - Mikk Antsov
- Institute of Physics, University of Tartu, Riia str. 142, Tartu 51014, Estonia
- Estonian Nanotechnology Competence Center, Riia str. 142, Tartu 51014, Estonia
| | - Sven Oras
- Institute of Physics, University of Tartu, Riia str. 142, Tartu 51014, Estonia
- Estonian Nanotechnology Competence Center, Riia str. 142, Tartu 51014, Estonia
| | - Runno Lohmus
- Institute of Physics, University of Tartu, Riia str. 142, Tartu 51014, Estonia
- Estonian Nanotechnology Competence Center, Riia str. 142, Tartu 51014, Estonia
| | - Ilmar Kink
- Institute of Physics, University of Tartu, Riia str. 142, Tartu 51014, Estonia
- Estonian Nanotechnology Competence Center, Riia str. 142, Tartu 51014, Estonia
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19
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Nguyen TD, Fuentes-Cabrera M, Fowlkes JD, Rack PD. Coexistence of spinodal instability and thermal nucleation in thin-film rupture: insights from molecular levels. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:032403. [PMID: 24730848 DOI: 10.1103/physreve.89.032403] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Indexed: 06/03/2023]
Abstract
Despite extensive investigation using hydrodynamic models and experiments over the past decades, there remain open questions regarding the origin of the initial rupture of thin liquid films. One of the reasons that makes it difficult to identify the rupture origin is the coexistence of two dewetting mechanisms, namely, thermal nucleation and spinodal instability, as observed in many experimental studies. Using a coarse-grained model and large-scale molecular dynamics simulations, we are able to characterize the very early stage of dewetting in nanometer-thick liquid-metal films wetting a solid substrate. We observe the features characteristic of both spinodal instability and thermal nucleation in the spontaneously dewetting films and show that these two macroscopic mechanisms share a common origin at molecular levels.
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Affiliation(s)
- Trung Dac Nguyen
- National Center for Computational Sciences, Oak Ridge National Laboratory, Tennessee 37831
| | - Miguel Fuentes-Cabrera
- Center for Nanophase and Materials Science, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Tennessee 37831 and Center for Nanophase and Materials Science, Oak Ridge National Laboratory, Tennessee 37831
| | - Jason D Fowlkes
- Center for Nanophase and Materials Science, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Tennessee 37831
| | - Philip D Rack
- Center for Nanophase and Materials Science, Oak Ridge National Laboratory, Tennessee 37831 and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996
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Li X, He Y, Wang Y, Dong J, Li H. Dewetting properties of metallic liquid film on nanopillared graphene. Sci Rep 2014; 4:3938. [PMID: 24487279 PMCID: PMC3909898 DOI: 10.1038/srep03938] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 01/15/2014] [Indexed: 01/27/2023] Open
Abstract
In this work, we report simulation evidence that the graphene surface decorated by carbon nanotube pillars shows strong dewettability, which can give it great advantages in dewetting and detaching metallic nanodroplets on the surfaces. Molecular dynamics (MD) simulations show that the ultrathin liquid film first contracts then detaches from the graphene on a time scale of several nanoseconds, as a result of the inertial effect. The detaching velocity is in the order of 10 m/s for the droplet with radii smaller than 50 nm. Moreover, the contracting and detaching behaviors of the liquid film can be effectively controlled by tuning the geometric parameters of the liquid film or pillar. In addition, the temperature effects on the dewetting and detaching of the metallic liquid film are also discussed. Our results show that one can exploit and effectively control the dewetting properties of metallic nanodroplets by decorating the surfaces with nanotube pillars.
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Affiliation(s)
- Xiongying Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
| | - Yezeng He
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
| | - Yong Wang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
| | - Jichen Dong
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
| | - Hui Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, P. R. China
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Afkhami S, Kondic L. Numerical simulation of ejected molten metal nanoparticles liquified by laser irradiation: interplay of geometry and dewetting. PHYSICAL REVIEW LETTERS 2013; 111:034501. [PMID: 23909328 DOI: 10.1103/physrevlett.111.034501] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Indexed: 05/12/2023]
Abstract
Metallic nanoparticles, liquified by fast laser irradiation, go through a rapid change of shape attempting to minimize their surface energy. The resulting nanodrops may be ejected from the substrate when the mechanisms leading to dewetting are sufficiently strong, as in the experiments involving gold nanoparticles [Habenicht et al., Science 309, 2043 (2005)]. We use a direct continuum-level approach to accurately model the process of liquid nanodrop formation and the subsequent ejection from the substrate. Our computations show a significant role of inertial effects and an elaborate interplay of initial geometry and wetting properties: e.g., we can control the direction of ejection by prescribing appropriate initial shape and/or wetting properties. The basic insight regarding ejection itself can be reached by considering a simple effective model based on an energy balance. We validate our computations by comparing directly with the experiments specified above involving the length scales measured in hundreds of nanometers and with molecular dynamics simulations on much shorter scales measured in tens of atomic diameters, as by M. Fuentes-Cabrera et al. [Phys. Rev. E 83, 041603 (2011)]. The quantitative agreement, in addition to illustrating how to control particle ejection, shows utility of continuum-based simulation in describing dynamics on nanoscale quantitatively, even in a complex setting as considered here.
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Affiliation(s)
- S Afkhami
- Department of Mathematical Sciences and Center for Applied Mathematics and Statistics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA.
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Gao R, Hu N, Yang Z, Zhu Q, Chai J, Su Y, Zhang L, Zhang Y. Paper-like graphene-Ag composite films with enhanced mechanical and electrical properties. NANOSCALE RESEARCH LETTERS 2013; 8:32. [PMID: 23324465 PMCID: PMC3602053 DOI: 10.1186/1556-276x-8-32] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 01/13/2013] [Indexed: 05/28/2023]
Abstract
In this paper, we have reported that paper-like graphene-Ag composite films could be prepared by a facile and novel chemical reduction method at a large scale. Using ascorbic acid as a reducing agent, graphene oxide films dipped in Ag+ aqueous solutions can be easily reduced along with the decoration of different sizes of Ag particles distributed uniformly. The results reveal that the obtained films exhibit improved mechanical properties with the enhancement of tensile strength and Young's modulus by as high as 82% and 136%, respectively. The electrical properties of graphene-Ag composite films were studied as well, with the sheet resistance of which reaching lower than approximately 600 Ω/□. The graphene-Ag composite films can be expected to find interesting applications in the area of nanoelectronics, sensors, transparent electrodes, supercapacitors, and nanocomposites.
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Affiliation(s)
- Rungang Gao
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Nantao Hu
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Zhi Yang
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Qirong Zhu
- Instrumental Analysis Center, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Jing Chai
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Yanjie Su
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Liying Zhang
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
| | - Yafei Zhang
- Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
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Abstract
We studied the thermophoretic motion of wrinkles formed in substrate-supported graphene sheets by nonequilibrium molecular dynamics simulations. We found that a single wrinkle moves along applied temperature gradient with a constant acceleration that is linearly proportional to temperature deviation between the heating and cooling sides of the graphene sheet. Like a solitary wave, the atoms of the single wrinkle drift upwards and downwards, which prompts the wrinkle to move forwards. The driving force for such thermophoretic movement can be mainly attributed to a lower free energy of the wrinkle back root when it is transformed from the front root. We establish a motion equation to describe the soliton-like thermophoresis of a single graphene wrinkle based on the Korteweg-de Vries equation. Similar motions are also observed for wrinkles formed in a Cu-supported graphene sheet. These findings provide an energy conversion mechanism by using graphene wrinkle thermophoresis.
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Affiliation(s)
- Yufeng Guo
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Institute of Nanoscience, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China.
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He Y, Li H, Li Y, Zhang K, Jiang Y, Bian X. Atomic insight into copper nanostructures nucleation on bending graphene. Phys Chem Chem Phys 2013; 15:9163-9. [DOI: 10.1039/c3cp50876e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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McKeown JT, Roberts NA, Fowlkes JD, Wu Y, LaGrange T, Reed BW, Campbell GH, Rack PD. Real-time observation of nanosecond liquid-phase assembly of nickel nanoparticles via pulsed-laser heating. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:17168-75. [PMID: 23145476 DOI: 10.1021/la303657e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Using pump-probe electron microscopy techniques, the dewetting of thin nickel films exposed to a pulsed nanosecond laser was monitored at tens of nanometers spatial and nanosecond time scales to provide insight into the liquid-phase assembly dynamics. Thickness-dependent and correlated time and length scales indicate that a spinodal instability drives the assembly process. Measured lifetimes of the liquid metal are consistent with finite-difference simulations of the laser-irradiated film and are consistent with estimated and observed spinodal time scales. These results can be used to design improved synthesis and assembly routes toward achieving advanced functional nanomaterials and devices.
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Affiliation(s)
- Joseph T McKeown
- Condensed Matter and Materials Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Nguyen TD, Fuentes-Cabrera M, Fowlkes JD, Diez JA, González AG, Kondic L, Rack PD. Competition between collapse and breakup in nanometer-sized thin rings using molecular dynamics and continuum modeling. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:13960-13967. [PMID: 22957759 DOI: 10.1021/la303093f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We consider nanometer-sized fluid annuli (rings) deposited on a solid substrate and ask whether these rings break up into droplets due to the instability of Rayleigh-Plateau-type modified by the presence of the substrate, or collapse to a central drop due to the presence of azimuthal curvature. The analysis is carried out by a combination of atomistic molecular dynamics simulations and a continuum model based on a long-wave limit of Navier-Stokes equations. We find consistent results between the two approaches, and demonstrate characteristic dimension regimes which dictate the assembly dynamics.
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Affiliation(s)
- Trung Dac Nguyen
- National Center for Computational Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee, United States
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Fowlkes J, Horton S, Fuentes-Cabrera M, Rack PD. Signatures of the Rayleigh-Plateau Instability Revealed by Imposing Synthetic Perturbations on Nanometer-Sized Liquid Metals on Substrates. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201202113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Fowlkes J, Horton S, Fuentes-Cabrera M, Rack PD. Signatures of the Rayleigh-Plateau Instability Revealed by Imposing Synthetic Perturbations on Nanometer-Sized Liquid Metals on Substrates. Angew Chem Int Ed Engl 2012; 51:8768-72. [DOI: 10.1002/anie.201202113] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Indexed: 11/11/2022]
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Fuentes-Cabrera M, Rhodes BH, Baskes MI, Terrones H, Fowlkes JD, Simpson ML, Rack PD. Controlling the velocity of jumping nanodroplets via their initial shape and temperature. ACS NANO 2011; 5:7130-6. [PMID: 21800918 DOI: 10.1021/nn2018254] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Controlling the movement of nanoscale objects is a significant goal of nanotechnology. Dewetting-induced ejection of nanodroplets could provide another means of achieving that goal. Molecular dynamics simulations were used to investigate the dewetting-induced ejection of nanoscale liquid copper nanostructures that were deposited on a graphitic substrate. Nanostructures in the shape of a circle, square, equilateral, and isosceles triangle dewet and form nanodroplets that are ejected from the substrate with a velocity that depends on the initial shape and temperature. The dependence of the ejected velocity on shape is ascribed to the temporal asymmetry of the mass coalescence during the droplet formation; the dependence on temperature is ascribed to changes in the density and viscosity. The results suggest that dewetting induced by nanosecond laser pulses could be used to control the velocity of ejected nanodroplets.
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Affiliation(s)
- Miguel Fuentes-Cabrera
- Center for Nanophase Materials Sciences, and Computer Sciences and Mathematics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6494, USA.
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