Article
Materials Science, Multidisciplinary
Daniel John Clarke, Francesca Carter, Iestyn Jowers, Richard James Moat
Summary: This paper introduces a new cellular metamaterial with a honeycomb structure that achieves zero Poisson's ratio. Compression testing and computational modeling show that the behavior of this metamaterial is isotropic and consistent across a range of relative densities. This metamaterial is expected to enable previously unfeasible technologies.
APPLIED MATERIALS TODAY
(2023)
Article
Engineering, Electrical & Electronic
Jianjun Wang, Weijie Li, Chengming Lan, Peijun Wei
Summary: A new method utilizing piezoelectric rings and electromechanical impedance technique for determining Young's modulus and Poisson's ratio of metals is proposed in this study. The feasibility of the method is demonstrated through experimental results, showing differences between static and dynamic material properties. Further efforts are needed to improve the EMI technique for potential high portability measurement applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Mechanical
Ning Wang, Qingtian Deng
Summary: This study investigated the elastic properties of irregular honeycomb structures, finding that axial deformation has a significant influence on the structure. The elastic properties of the structure are affected by the enclosed area, shape, and material properties.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Hsin-Jung Tsai, Wei-Chun Li, Wen-Kuang Hsu
Summary: Composites made from multi-walled carbon nanotubes and polydimethylsiloxane exhibit excellent piezoresistivity at elastic limits, with high sensitivity and matched resistance changes during bending and twisting. Pulse-like resistance changes are attributed to the rapid increase in intertube spacing. The movement and segmentation of tube aggregates explain the tube mobility range and sensing mechanism.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2021)
Article
Materials Science, Multidisciplinary
Ning Feng, Yuanhao Tie, Shangbin Wang, Junxian Guo, Zhaoguang Hu
Summary: This paper reports a new annular honeycomb structure with tunable Poisson's ratio. The honeycomb provides both in-plane negative Poisson's ratio and in-plane zero Poisson's ratio by changing the shape of the honeycomb core. The mechanical properties of the developed honeycomb core, constructed by an annulus with four ligaments distributed bi-axial symmetrically, are investigated using theoretical models based on Castigliano's Second Theorem and energy principle. Experimental results and finite element analysis validate the effectiveness of the developed models.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Xuan Chen, Ming-Hui Fu, Wei-Hua Li, Sergey V. Sheshenin
Summary: A novel 3D structure with both ZPR and NPR is proposed by splicing the 2D parallelogram honeycomb structure orthogonally. The structure exhibits different Poisson's ratios in different directions, and its properties are verified through finite element simulation and experiments. This structure may have important applications in aerospace, biomedical, and other fields.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Geochemistry & Geophysics
Hongjian Fang, Malcolm C. A. White, Yang Lu, Yehuda Ben-Zion
Summary: This study derives new 3D seismic wavespeed models and a seismic catalog for Southern California, contributing to improved regional wavespeed models, accurate event locations, and insights into subsurface features and crustal mechanics. The results show correlations with regional geological features and provide more accurate synthetic waveforms for shorter periods. The derived event catalog exhibits tighter spatial clustering than the standard catalog, aiding in characterizing major faults. The study also reveals depth-dependent variations in the Vp/Vs ratio and its correlation with deep seismicity, suggesting the influence of brittle-to-ductile transition depth on crustal mechanics.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Chemistry, Multidisciplinary
Ziyang Qu, Meiling Xu, Shuyi Lin, Yiwei Liang, Xuanhao Yuan, Feilong Wang, Jian Hao, Yinwei Li
Summary: In this study, a two-dimensional material called Si2S with a negative Poisson's ratio was predicted using first-principles methods. The Si2S monolayer has a puckered lattice structure and exhibits negative Poisson's ratios along both x and y directions. It also shows semiconductor properties and a high absorption coefficient for visible light, as well as good oxidation resistance. These versatile properties make Si2S a promising material for nanodevices.
Article
Chemistry, Physical
Yifan Gao, Minru Wen, Xin Zhang, Fugen Wu, Qinglin Xia, Haoyi Wu, Huafeng Dong
Summary: Negative Poisson's ratio (NPR) materials are widely used in engineering due to their good resistance to shear, denting, and fracture. The NPR phenomenon in 2D single-layer materials can be explained by both mechanical principles and electronic effects, with hinge structures playing a crucial role in determining the inherent NPR.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Polymer Science
Jonathan A. Sotomayor-del-Moral, Juan B. Pascual-Francisco, Orlando Susarrey-Huerta, Cesar D. Resendiz-Calderon, Ezequiel A. Gallardo-Hernandez, Leonardo I. Farfan-Cabrera
Summary: This study presents new data on creep and viscoelastic Poisson's ratio of five engineering elastomers at different stress and temperature conditions. The results show that the Poisson's ratio of these elastomers increases with temperature and time.
Article
Engineering, Mechanical
Bin Ling, Kai Wei, Zhaoliang Qu, Daining Fang
Summary: Cylindrical metastructures with programmable Poisson's ratio can be designed by densifying the circumferential unit cells to approach the Poisson's ratio of planar metamaterials. By modulating geometric parameters, large positive and negative Poisson's ratios can be obtained, enabling applications in shape morphing and deployable devices.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Xiao Xie, Mengteng Chen, Yawei Yu, Jia Li, Mingwen Zhao, Linyang Li
Summary: Research on the surface properties and ferromagnetism of 2D materials is important for future nanomechanical and spintronic devices. In this study, the bimetallic phosphide ScMP2 is proposed as a 2D material with both auxetic properties and ferromagnetism. The research shows different crystal structures and improvement in both auxetic properties and magnetic energy can be achieved.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Hassan Mansoori, Ramin Hamzehei, Soheil Dariushi
Summary: This paper introduces a new assembly method using two concentric cylindrical tubes to increase energy-absorption capacity by coupling effects. The results show that this method not only avoids negative stiffness, but also enhances energy-absorption capacity.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2022)
Article
Engineering, Civil
Junwei Pan, Meng Li, Jianguo Cai
Summary: In this paper, reinforced honeycombs with nearly 1 m in length were assembled and the effects of relative thickness and corrugated plate angle on Poisson's ratio and mechanical properties were investigated. Additionally, three design strategies were adopted to further regulate Poisson's ratio.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Geological
Sannith Kumar Thota, Toan Duc Cao, Farshid Vahedifard
Summary: The paper introduces the concept of Poisson's ratio characteristic curve (PRCC) to establish the relationship between Poisson's ratio and degree of saturation. Through calibration and validation, the proposed model can accurately predict the behavior of soils, leading to more accurate assessments in geotechnical engineering applications.
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
(2021)
Article
Mechanics
Cecilia Huertas-Cerdeira, Andres Goza, John E. Sader, Tim Colonius, Morteza Gharib
Summary: The dynamics of a cantilever plate at non-zero angles exhibit four distinct regimes, including small and large amplitude flapping motions, with different physical mechanisms at play. The plate enters the deflected regime at a lower flow speed with increasing angle of attack, causing the flapping motion to disappear for angles greater than approximately 28 degrees. Additionally, plates with reduced aspect ratios lack a clear distinction between flapping regimes at angles above 8 degrees.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Man-Nung Su, Behnaz Ostovar, Niklas Gross, John E. Sader, Wei-Shun Chang, Stephan Link
Summary: Acoustic vibrations in lithographically fabricated Au and Al nanostructures were studied using single-particle transient extinction spectroscopy, revealing a blue shift in frequency due to the presence of a substrate and providing insights into the binding strength between Au nanostructures and the substrate. Comparison of the acoustic properties and quality factor of Au and Al nanostructures suggests internal defects dominate the energy dissipation pathway in these polycrystalline structures. This research sheds light on the optomechanical properties of nanostructures fabricated by electron-beam lithography.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Mechanics
John Elie Sader
Summary: The study of a sphere's motion in a viscous gas using the linearised Boltzmann-BGK equation provides a comprehensive understanding of flows, including continuum and collisionless flows. The research also shows that impulsive rotation of a sphere in a gas generates heat flow, with its direction reversing as the flow evolves.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Chemistry, Physical
Debadi Chakraborty, Brian Uthe, Edward W. Malachosky, Matthew Pelton, John E. Sader
Summary: This study observed slip enhancement between flowing liquids and solid surfaces, caused by the intrinsic viscoelasticity of the liquid. The enhancement of slip compared to traditional models has implications on the understanding of ultrafast liquid flows and various technologies utilizing liquid flows.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Brian Uthe, Jesse F. Collis, Mahyar Madadi, John E. Sader, Matthew Pelton
Summary: The study successfully considered the compression and shear relaxation properties of the liquid using highly spherical gold nanoparticles to drive flows without the use of the no-slip boundary condition at the particle surface.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Engineering, Environmental
Yunhong Shi, Dunzhu Li, Liwen Xiao, Daragh Mullarkey, Daniel K. Kehoe, Emmet D. Sheerin, Sebastian Barwich, Luming Yang, Yurii K. Gun'ko, Igor V. Shvets, Matthias E. Mobius, John J. Boland, Jing Jing Wang
Summary: The study found that microplastic release levels from plastics exposed to tap water and synthetic drinking water were similar, indicating that synthetic drinking water can be a suitable reference standard for testing microplastic release levels from plastic products. Polypropylene products exposed to boiling tap water developed a protective copper oxide film, leading to a significant reduction in microplastic release.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Robin J. Dolleman, Debadi Chakraborty, Daniel R. Ladiges, Herre S. J. van der Zant, John E. Sader, Peter G. Steeneken
Summary: The resonance frequency of membranes is influenced by gas pressure, mainly due to the squeeze-film effect, especially evident in low-mass graphene membranes. Research found that the resonance frequency of single-layer graphene resonators is lower than expected from ideal compression models, leading to the proposal of an improved model incorporating gas leakage effects. This study contributes to a better understanding of the squeeze-film effect and offers insights for optimizing squeeze-film pressure sensors made from 2D materials.
Article
Chemistry, Multidisciplinary
Jesse F. Collis, Selim Olcum, Debadi Chakraborty, Scott R. Manalis, John E. Sader
Summary: The Navier slip condition describes the motion of a liquid relative to a neighboring solid surface, with its characteristic Navier slip length being a constitutive property of the solid-liquid interface. Measurement of this slip length is complicated due to its small magnitude, but experimental technique that interrogates the Navier slip length on individual nanoparticles immersed in liquid has been developed with subnanometer precision. Proof-of-principle experiments show a constant slip length of 2.7 +/- 0.6 nm (95% C.I.) on individual, citrate-stabilized, gold nanoparticles in water, independent of particle size, motivating further studies to validate existing molecular simulation data on slip.
Article
Mechanics
Edward M. Hinton, Jesse F. Collis, John E. Sader
Summary: The problem involves the motion of a yield-stress material of finite height above a flat plate, encompassing both fluid-like and rigid behavior. The yield surface emerges from the plate at a rate faster than momentum diffusion, with a constant yield stress accelerating the rigid region adjacent to the free surface.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Environmental
Yunhong Shi, Dunzhu Li, Liwen Xiao, Emmet D. Sheerin, Daragh Mullarkey, Luming Yang, Xue Bai, Igor Shvets, John J. Boland, Jing Jing Wang
Summary: This study found that the addition of typical ions and particles in household plastic products can significantly reduce the release of microplastics. Different ions form different films to prevent the release of microplastics, while particles do not have this effect.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Mechanics
Justin S. Leontini, John E. Sader
Summary: The study presents a numerical simulation of a mechanical system called the "rigid inverted flag," which consists of a rigid plate attached to a torsional spring. The findings show that the flapping dynamics of inverted flags do not solely depend on their continuous flexibility, but can also be exhibited by rigid structures. The rigid inverted flag demonstrates additional states, including small-amplitude flapping and chaotic large-amplitude flapping regimes. The study reveals that the competition and instability between periodic states lead to chaos through various mechanisms. This research provides motivation for future experimental studies on the dynamics of rigid inverted flags.
JOURNAL OF FLUID MECHANICS
(2022)
Review
Physics, Multidisciplinary
Brian Uthe, John E. Sader, Matthew Pelton
Summary: Standard continuum assumptions may not apply to fluid flows at the nanoscale, as even simple molecular liquids can exhibit non-Newtonian viscoelastic responses and nanometer-scale slip. Optical measurements of metal nanoparticles' mechanical vibrations provide insights into the rheology and slip behavior of simple liquids at the nanoscale.
REPORTS ON PROGRESS IN PHYSICS
(2022)
Article
Physics, Applied
Naijian Shen, Debadi Chakraborty, John E. E. Sader
Summary: This article presents an exact analytical theory for the resonant response of rectangular cantilevered plates immersed in viscous fluids, and finite-element simulations are conducted to validate the theory. The results of this study are expected to have practical implications for the design and application of micro- and nano-electromechanical systems.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Mechanics
Edward M. M. Hinton, Jesse F. F. Collis, John E. E. Sader
Summary: This study quantitatively explores the fluid physics of oscillatory flow of Bingham material on a solid plate through analytical approximations and numerical computation. It reports four key topological properties concerning the generation and termination of yielded regions. Theoretical results can be used as a basis for oscillatory rheometry to measure the yield stress.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Physical
Stephan Link, Niklas Gross, Mahyar Madadi, Behnaz Ostovar, Pratiksha D. Dongare, Lauren A. McCarthy, Wei-Yi Chiang, Wei-Shun Chang, Naomi J. Halas, Christy F. Landes, John E. Sader
Summary: We investigate the effect of substrate-particle binding strength on the vibrational Q-factor of lithographically prepared gold nanodisks. Strong binding leads to higher acoustic Q-factors, and we propose an approach to tune enhanced acoustic Q-factors of nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
