Article
Physics, Multidisciplinary
M. Liu, Y. Zhang, G. L. Klimchitskaya, V. M. Mostepanenko, U. Mohideen
Summary: The experimental confirmation of the unusually big thermal effect at separations below 1 μm for graphene suggests that its effective temperature is determined by the Fermi velocity rather than the speed of light.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Ge Song, Zhixiang Liu, Lingchun Jia, Cong Li, Yingli Chang
Summary: A flexible method for modulating the Casimir force using graphene and hyperbolic materials (HMs) is proposed. By combining two candidates other than graphene (hexagonal boron nitride and porous silicon carbide), the Casimir force can be increased monotonically and controlled flexibly by varying the Fermi level and the filling factor of porous silicon carbide.
Article
Nanoscience & Nanotechnology
Tong-Biao Wang, Ying Zhou, Hong-Qian Mu, Khurram Shehzad, De-Jian Zhang, Wen-Xing Liu, Tian-Bao Yu, Qing-Hua Liao
Summary: The lateral Casimir force acting on a 50 nm particle near hyperbolic metamaterial can be enhanced nearly four times compared to that near SiC bulk. This enhancement is caused by the coupling between the resonance mode excited by nanoparticles and the hyperbolic mode supported by hyperbolic metamaterial, providing an efficient method to enhance the interaction of nanoscale objects.
Article
Chemistry, Physical
Atharva S. Kelkar, Bradley C. Dallin, Reid C. Van Lehn
Summary: Hydrophobic interactions play a crucial role in various biological and synthetic processes. This study demonstrates that the hydrophobicity of surfaces with chemically heterogeneous compositions can vary substantially depending on the spatial patterns and chemical identities of polar and nonpolar groups. The clustering of nonpolar groups is a common signature of highly hydrophobic patterns, and molecular dynamics analysis reveals its correlation with the perturbation of interfacial water structure.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Mechanics
Jiacheng Wu, Yong Zhang, Jixiang Li, Xiongming Lai, Nian Duan
Summary: This paper proposes a novel nested corrugated-elliptical tube (NCET) system for energy absorption. The crushing characteristics of the NCET are investigated through experiments and finite element analysis. The results show that the NCET exhibits a low initial stiffness, stable deformation process, and high energy absorption. Compared to single-walled tubes and typical nested energy absorbers, the NCET has higher specific energy absorption and lower initial peak crushing force. The study also analyzes the influence of different parameters on the crushing behavior of the NCET.
COMPOSITE STRUCTURES
(2022)
Article
Physics, Multidisciplinary
Vitaly B. Svetovoy
Summary: This study analyzes the possibility of compensating for the electrostatic interaction between a metal and poor conducting material. It shows that under certain conditions, the electrostatic force can be compensated for, which opens up new possibilities for investigating the Casimir interaction in poor-conducting materials.
Article
Multidisciplinary Sciences
Kristin N. Calahan, Yuan Qi, Karl G. Johannes, Mark E. Rentschler, Rong Long
Summary: The study found that micropatterned surfaces can generate enhanced shear traction on soft tissue-like materials, thereby improving the anchoring performance of medical devices on tissue. By experimentally measuring microscale three-dimensional deformation, it was revealed that lateral contact between pillar arrays and soft hydrogel substrates plays a key role in shear response.
Article
Chemistry, Multidisciplinary
Kathryn A. Whitehead, Stephen Lynch, Mohsin Amin, Ted Deisenroth, Christopher M. Liauw, Joanna Verran
Summary: This study investigated the adhesion and binding characteristics of different shaped conidia (round or spikey) produced by Aspergillus niger subtypes 1957 and 1988 on different surfaces. Anionic surfaces were found to be more repulsive to the conidia, but once attached, the conidia bound more firmly to the anionic surfaces. Additionally, conidia shape and surface wettability also influenced the density and clustering of the conidia.
Article
Multidisciplinary Sciences
Galina L. Klimchitskaya, Constantine C. Korikov, Vladimir M. Mostepanenko, Oleg Yu. Tsybin
Summary: This study investigates the out-of-thermal-equilibrium Casimir-Polder force between nanoparticles and dielectric substrates coated with gapped graphene using the Dirac model and the polarization tensor formalism. The results show that the presence of a substrate can increase the magnitude of the nonequilibrium force. The temperature of the graphene-coated substrate also affects the force magnitude.
Article
Chemistry, Physical
Qinyi Li, Rui Li, Weiyu Shi
Summary: This study investigated the adsorption behavior of monovalent cations Li+, Na+, and Cs+ on montmorillonite and quartz surfaces in LiCl, NaCl, and CsCl solutions, respectively, revealing differences in adsorption mechanisms due to the presence of different forces such as electrostatic force, asymmetric orbital hybridization force, and dispersion force. The results showed that the total adsorption energy at the montmorillonite surface was disproportionately larger than that at the quartz surface, with different forces driving cation adsorption at each surface.
APPLIED CLAY SCIENCE
(2021)
Article
Physics, Multidisciplinary
Thomas Oosthuyse, David Dudal
Summary: In this paper, the Casimir energies and forces are determined in various experimentally viable setups, and it is found that purely attractive Casimir forces can be achieved in specific combinations.
Article
Energy & Fuels
Yangchao Xia, Yaowen Xing, Xiahui Gui, Yijun Cao
Summary: In this study, the interactions between hydrocarbon oil and hydrophilic mineral surfaces were explored using CFM and MD simulations. Different functional groups were found to significantly influence the adhesion force between the oil collector and mineral surface, with polar hydrocarbon oils adhering strongly to the surface. The combination of MD and CFM provided a theoretical reference for mineral flotation separation.
Article
Astronomy & Astrophysics
Shunashi G. Castillo-Lopez, Carlos Villarreal, Giuseppe Pirruccio, Raul Esquivel-Sirvent
Summary: This paper revisits the issue of Casimir force between high-T-c superconductors, focusing on the unique temperature dependence of reflectivity in ceramic superconductors during the transition. It is suggested that ceramic superconductors can serve as an alternative system to study electronic relaxation effects. The study highlights that the two main damping mechanisms associated with free and mid-infrared electrons can be separately considered, facilitating experimental identification of their contributions to the Casimir force.
Article
Acoustics
Bowen Wu, Wenjing Wang, Tiancheng Tang, Jiabao Pan, Rongyun Zhang, Dongdong Ye, Rui Xu
Summary: The study investigates the corrugated wear on the metro curved track. Dynamic analysis is conducted to examine the effects of vehicle speed and curve radius on wheel-rail creep forces. A finite element model of a wheel/rail system, incorporating a mixed Lagrangian/Eulerian description and wheel inertia, is established. The study reveals the initiation of corrugation under friction-induced vibration of the wheel/rail system, and the dominance of lateral creep forces in this vibration. The research emphasizes the importance of considering wheel inertia in studying friction-induced vibration to avoid prediction errors and overestimation of corrugation occurrence.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Materials Science, Multidisciplinary
Takuro Tokunaga, Amun Jarzembski, Takuma Shiga, Keunhan Park, Mathieu Francoeur
Summary: This paper investigates the extreme near-field heat transfer between metallic surfaces and finds that the role of phonons and electrons in heat transfer varies under different bias voltages. It suggests that well-controlled measurements between metallic surfaces are needed to quantify the contributions of phonons and electrons to heat transfer.
Review
Astronomy & Astrophysics
Galina L. Klimchitskaya
Summary: This paper reviews hypothetical interactions beyond the Standard Model and their constraints in tabletop laboratory experiments. The interactions include power-type potentials, Yukawa potential, spin-independent potentials, and spin-dependent potentials. Constraints on these interactions are considered based on the Casimir effect and other tabletop physics, with a focus on exotic particles in the context of quantum vacuum, dark energy, and the cosmological constant.
Article
Nanoscience & Nanotechnology
Shuei-De Huang, En-De Chu, Yu-Han Wang, Jhe-Wei Liou, Ruei-Si Wang, Wei-Yen Woon, Hsiang-Chih Chiu
Summary: In this study, the variation of work function (WF) of supported single-layer graphene (SLG) in sliding electrical contact was investigated. It was found that the effective WF of SLG was influenced by both the tunneling triboelectric effect (TTE) and tribochemical-induced surface functionalization. This study suggests that the variation of SLG WF in a sliding electrical contact interface needs to be considered for related applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Editorial Material
Astronomy & Astrophysics
Nazar R. Ikhsanov, Galina L. Klimchitskaya, Vladimir M. Mostepanenko
Article
Multidisciplinary Sciences
Galina L. Klimchitskaya, Vladimir M. Mostepanenko, Oleg Yu Tsybin
Summary: The study focused on the Casimir pressure in peptide films deposited on different dielectric or metallic substrates. It was found that for dielectric-type semiconductor substrates, the thickness of the film determines whether the Casimir pressure is attractive or repulsive, depending on the percentage of water and the static dielectric permittivity of the semiconductor substrate; while for metallic-type semiconductor substrates, the Casimir pressure in peptide coatings is always repulsive.
Review
Physics, Multidisciplinary
Galina L. Klimchitskaya, Vladimir M. Mostepanenko
Summary: This article reviews the scientific pictures of the universe from ancient times to Albert Einstein and highlights Alexander Friedmann's prediction of the universe expansion. It discusses the experimental confirmation of this prediction and the implications it has on our understanding of the world.
Article
Materials Science, Multidisciplinary
G. L. Klimchitskaya, V. M. Mostepanenko, O. Yu. Tsybin
Summary: In this study, the nonequilibrium Casimir-Polder force between a nanoparticle and a graphene sheet kept at different temperatures was examined using the formalism of the polarization tensor in the framework of a Dirac model. The results demonstrate that the magnitude of the force increases with the temperature of the graphene sheet. The impact of nonequilibrium conditions on the force becomes smaller at larger separations. Our findings reveal that for a graphene sheet with a lower temperature than the environment, the attractive Casimir-Polder force vanishes at a specific separation distance and becomes repulsive at larger distances. This effect has potential applications in fundamental graphene research and force control in bioelectronic microdevices.
Article
Optics
G. L. Klimchitskaya, V. M. Mostepanenko
Summary: The paper introduces a new phenomenological dielectric function for metals, which exhibits similar response as the standard Drude model for propagating waves but different response for evanescent waves. Using this function, the effective Casimir pressure and force between different test bodies are calculated and compared with measurement data. The results show that the predictions of the Lifshitz theory using the dissipative nonlocal response functions are in good agreement with the measurement data.
Article
Astronomy & Astrophysics
G. L. Klimchitskaya, V. M. Mostepanenko
Summary: The Lifshitz theory of the Casimir force was extended to parallel magnetic metal plates with nonlocal dielectric responses. Results showed minimal differences in Casimir pressures between different nonlocal and local response functions at short separations but significant discrepancies at a few micrometer distances. The gradient of the Casimir force between Ni-coated surfaces of a sphere and a plate using alternative nonlocal response functions demonstrated good agreement with measurement data, providing insights for resolving longstanding problems in Casimir physics.
Article
Materials Science, Multidisciplinary
M. Liu, Y. Zhang, G. L. Klimchitskaya, V. M. Mostepanenko, U. Mohideen
Summary: The experimental results show that the polarization tensor of graphene can well describe the Casimir force gradient between an Au-coated hollow glass microsphere and a graphene-coated fused silica plate, while also excluding the theoretical predictions at zero temperature. The study also found a correlation between the thermal correction to the Casimir force gradient and factors such as substrate, energy gap, and chemical potential.
Article
Materials Science, Multidisciplinary
G. L. Klimchitskaya, V. M. Mostepanenko, E. N. Velichko
Summary: The presence of a graphene sheet can change the Casimir pressure in peptide films deposited on metallic substrates from repulsive to attractive. The effects are influenced by the chemical potential and energy gap of the graphene sheet.
