Article
Chemistry, Physical
Tak Shing Chan
Summary: A study on the growth and decay of a viscoelastic wetting ridge reveals that the global features evolve with time scales corresponding to the relaxation of the viscoelastic material, while the dynamics locally around the tip of the ridge are determined by the surface tensions and have a characteristic spreading velocity dependent on the solid surface tension. The relaxation time to an equilibrium state depends on the distance from the contact line, which can be much smaller than the long-term relaxation time scale of the viscoelastic material. These findings suggest an alternative focus when investigating the contact line dynamics in soft wetting.
Article
Chemistry, Multidisciplinary
Cory Cline, Haozhe Wang, Jing Kong, Tianshu Li, Jifeng Liu, Ulrike G. K. Wegst
Summary: This study focuses on the heterogeneous ice nucleation (HIN) on single-layer graphene (SLG) transferred onto different substrates. The difference in interface energies between the substrate/water and substrate/ice plays a major role in determining the HIN rate, while wettability alone is not a good indicator of HIN capability.
Article
Optics
Junqiang Guo, Mengmeng Wang, Qitong Guo, Tong Zhu, Mingchen DU, Pu Zhao, Lihui Feng
Summary: In this study, the researchers found that the plasma ejected during GaP crystal ablation changed from cylindrical to planar propagation with increasing laser fluence. The energy of propelling shockwaves accounted for 12% to 18% of the laser pulse energy at all fluences above the ablation threshold. A prominent plasma splitting was observed at a slightly higher fluence than the threshold, and the plasma protruded out of the shockwaves. The temperature difference between the plasma and the shockwave confirmed the heating effect of the plasma during ablation.
Article
Mechanics
C. Q. Ru
Summary: The present paper investigates the critical condition for negative surface tension-driven circumferential wrinkling of soft cylinders based on the linearized Steigmann-Ogden model. A simple relation between negative surface tension and mode number is derived, making it easy to determine the critical surface residual strain and associated mode number. The results obtained from the model are in good agreement with numerical results based on the neo-Hooken nonlinear model. The study also includes the critical condition for circumferential wrinkling of the inner surface of a cylindrical hole within an infinite body, providing supporting evidence for the accuracy of the linear Steigmann-Ogden model.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Mechanics
G. Pijaudier-Cabot, D. Toussaint, G. Hantal, R. Vermorel
Summary: The effect of plate thickness on a Lennard Jones FCC crystal under tension is investigated using molecular simulations. The global elastic response of the plate is found to depend on its thickness, with Young's modulus and Poisson's ratio increasing with plate thickness. Stress distributions across the plate thickness are calculated using a local version of the method of planes. The results show that the stress distributions for unloaded plates exhibit in-plane tensile stresses near the free surfaces, referred to as interface stress, in the first layers of atoms. The methodology and results of this study can provide insights for future extended continuum theories.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Physics, Multidisciplinary
Henrik H. Kristensen, Lorenz Kranabetter, Constant A. Schouder, Christoph Stapper, Jacqueline Arlt, Marcel Mudrich, Henrik Stapelfeldt
Summary: In this study, rubidium dimers on helium nanodroplets were doubly ionized by an intense femtosecond laser pulse, resulting in fragmentation into a pair of Rb+ ions. We demonstrate that the kinetic energy of the Rb+ fragment ions can be used to identify dimers in either the X or a state. The abundance ratio of dimers in the a and X states was found to be between 4:1 and 5:1, depending on the mean droplet size. This technique can be applied to alkali atom dimers and trimers and enable femtosecond time-resolved measurements of their rotational and vibrational dynamics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Biology
Irene Nagle, Florence Delort, Sylvie Henon, Claire Wilhelm, Sabrina Batonnet-Pichon, Myriam Reffay
Summary: The liquid and elastic behaviors of tissues play a crucial role in their morphology and response to the environment. In this study, we investigated the role of individual cell properties and intermediate filaments on the mechanics of tissue models, specifically focusing on mouse muscle precursor cells. We found that intermediate filaments, particularly desmin, play a significant role in the macroscopic mechanics of unorganized muscle tissue models, even at an early stage of differentiation.
Article
Chemistry, Multidisciplinary
Dmitrii Shuleiko, Mikhail Martyshov, Dmitrii Amasev, Denis Presnov, Stanislav Zabotnov, Leonid Golovan, Andrei Kazanskii, Pavel Kashkarov
Summary: One-dimensional periodic surface structures were fabricated on amorphous hydrogenated silicon films by femtosecond laser irradiation. The orientation of the surface structure is determined by laser polarization and the concentration of excited carriers, affecting the formation of periodic relief. Femtosecond laser irradiation significantly increases the conductivity of the films by inducing the formation of Si nanocrystalline phase.
Article
Materials Science, Multidisciplinary
Cuiping Ma, Artur Movsesyan, Zhimin Jing, Yisong Zhu, Peihang Li, Wenhao Wang, Alina Muravitskaya, Alexander O. Govorov, Zhiming Wang
Summary: Photothermal conversion in plasmonic nanostructures has led to the development of plasmon-induced optofluidics. The study explores the control and manipulation of liquid surfaces through plasmon heating and convective fluid flow, resulting in the emergence of surface tension gradient and fluid deformation. The results demonstrate that varying levels of deformation can be achieved by adjusting structural parameters or incident light intensity. This understanding of light-induced asymmetric deformation opens new avenues for controlling fluid flow and can have applications in optofluidics and the fabrication of metal/polymer metasurfaces.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Yue Zhao, Bing Han, Zhonghua Shen, Zewen Li, Yunxiang Pan
Summary: The morphology of copper foil under continuous wave laser ablation is influenced by the pressure environment. In a low pressure environment, there are few splashes and ring ripples are observed on the molten region's surface. A 2D model considering temperature dependent surface tension and condensation coefficient reveals that the Marangoni effect is the main driver of fluid flow during laser irradiation. These findings provide insights into the mechanisms of ripple formation on metal foil induced by CW laser irradiation.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Berkin Dortdivanlioglu, Ali Javili
Summary: Surface elasticity theory has seen a significant growth in recent years, particularly in understanding the mechanics of nanomaterials and soft solids at small scales. This study formulates a finite deformation theory for boundary viscoelasticity by considering strain-dependent boundary stresses, including surface and curve effects. The developed computational framework demonstrates the influence of boundary viscoelasticity on material response and highlights various applications of the bulk-boundary coupled formulation that require further investigation.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Review
Chemistry, Multidisciplinary
Hans Agren, Olle Bjorneholm, Gunnar Ohrwall, Vincenzo Carravetta, Arnaldo Naves de Brito
Summary: We unraveled the microscopic properties of ethanol-water solutions at different concentrations through experimental and theoretical simulations. At low concentrations, ethanol molecules form a film at the surface, while complex intermolecular interactions occur in the bulk.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Chemistry, Analytical
Wen Zhang, Ran Zhou, Kun Liu, Qingzhou Li, Zhiyang Tang, Chenwei Zhu, Xiangyou Li, Xiaoyan Zeng, Chao He
Summary: The use of SiO molecules for LIBS-LIMF calibration can eliminate self-absorption effects in silicon content analysis and improve sensitivity, making it a potential method for rapidly determining the silicon element in the steel industry.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2021)
Article
Chemistry, Analytical
Fangjian Zhang, Qiuyun Wang, Yuanfei Jiang, Anmin Chen, Mingxing Jin
Summary: Metal nanoparticles (NPs) at different concentrations were deposited on the pure Al substrate surface to enhance the spectral emission of AlO molecular bands. The emission intensity of AlO (0-0) and (1-1) increased and then decreased with the increase of Au NP concentration, reaching the strongest emission at 0.98 ng mL(-1). The time-resolved characteristics of AlO spectra showed different emission intensities and spectral lifetimes at different concentrations of Au NPs, with the strongest peak intensity and longest spectral lifetime observed at 0.98 ng mL(-1) concentration. The vibration temperature of AlO was consistent with the spectral emission and varied with the concentration of Au NPs.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Multidisciplinary Sciences
Baptiste Chide, Olivier Beyssac, Michel Gauthier, Karim Benzerara, Imene Esteve, Jean-Claude Boulliard, Sylvestre Maurice, Roger C. Wiens
Summary: The study demonstrates the monitoring of laser-induced mineral phase transitions using the SuperCam instrument on the Mars 2020 Perseverance rover, revealing insights into the physical and thermal properties of the target and their influence on the acoustic signal. This helps in discriminating mineral phases, as the capabilities of LIBS data are limited.
SCIENTIFIC REPORTS
(2021)