Article
Chemistry, Physical
Ravi C. Dutta, Christian C. Zuluaga-Bedoya, Suresh K. Bhatia
Summary: Fluid transport in finite-sized nanoporous materials is significantly affected by apparent interfacial barriers, where transport coefficients are non-uniform and increase with distance from the external surface, approaching the bulk system value far from the surface. The attenuation of transport occurs in a finite entrance region due to the fluid momentum decorrelation, which has remarkable effects on membrane selectivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Public, Environmental & Occupational Health
Shahrukh Khan, Bridey Saultry, Scott Adams, Abbas Z. Kouzani, Kelly Decker, Robin Digby, Tracey Bucknall
Summary: This study compared the accuracy of NCIT and TAT in adult patients, finding that they were closely aligned at temperatures <37.5 degrees C but not at temperatures >37.5 degrees C. NCIT had poor accuracy at temperatures >37.5 degrees C, indicating it may not be the most suitable device for mass fever screening during a pandemic.
AMERICAN JOURNAL OF INFECTION CONTROL
(2021)
Article
Chemistry, Physical
Qingquan Ma, Joshua Young, Jianan Gao, Yi Tao, Wen Zhang
Summary: This study investigated the dissolution behavior of silver nanoparticles (Ag NPs) with different shapes (nanocube, nanorod, and octahedron). The hydrophobicity and electrochemical activity of the Ag NPs were examined using atomic force microscopy coupled with scanning electrochemical microscopy. The results showed that octahedron Ag NPs dissolved faster than the other two shapes, and the (111) surface facet had stronger affinity towards water molecules. Coating the (100) facet with poly(vinylpyrrolidone) or PVP was critical for stabilizing and preventing dissolution.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Condensed Matter
Varun Pandey, Munish Kumar
Summary: A simple theory based on the bond energy model is developed and applied to study the bulk modulus of different nanomaterials. The model shows good agreement with experimental results and is further extended to investigate the size and shape dependence of bulk modulus. Comparison with earlier work and experimental data demonstrates the model's better predictive capability. This simple model, which works well from bulk to nanoscale, is not yet available in the literature.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Multidisciplinary Sciences
W. Dong
Summary: Disjoining pressure, discovered by Derjaguin in the 1930s, explains the difference between the pressure of a confined fluid and the pressure in bulk. Recent studies reveal that disjoining pressure is the cause of distinct surface tensions for strongly confined fluids. This research introduces the concept of a disjoining chemical potential, advancing our understanding of nanoscale thermodynamics and proposing experimental verifications. Ensemble-dependence is a key characteristic of thermodynamics in small systems, and this work demonstrates that integral surface tension is ensemble-dependent while differential surface tension is not.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Daniel Carrasco, Eva Nieto-Pinero, Manuel Alonso-Orts, Rosalia Serna, Jose M. San Juan, Maria L. No, Jani Jesenovec, John S. S. McCloy, Emilio Nogales, Bianchi Mendez
Summary: An accurate understanding of the optical properties of beta-Ga2O3 is crucial for its full potential in photonics applications, especially its dependence on temperature. Optical micro- and nanocavities created within microwires and nanowires using distributed Bragg reflectors (DBR) show promise for various applications. This study analyzed the effect of temperature on the anisotropic refractive index of beta-Ga2O3 using ellipsometry, obtaining temperature-dependent dispersion relations fitted to Sellmeier formalism. Micro-photoluminescence (mu-PL) spectroscopy of microcavities in Cr-doped beta-Ga2O3 nanowires showed a thermal shift in red-infrared Fabry-Perot optical resonances, mainly due to temperature variations in the refractive index. Comparisons with finite-difference time-domain (FDTD) simulations incorporating the temperature-dependent, anisotropic refractive index obtained from ellipsometry revealed similar shifts, with slightly larger values observed in mu-PL results. The thermo-optic coefficient was calculated.
Article
Chemistry, Multidisciplinary
Andrew J. Baker, Sai Bharadwaj Vishnubhotla, Rimei Chen, Ashlie Martini, Tevis D. B. Jacobs
Summary: The adhesion between nanoscale components has been shown to increase with applied load due to a change in the mode of separation. This increase in adhesion is governed by the product of adhesive strength and contact area, providing guidance for tailoring adhesion in various applications.
Article
Materials Science, Multidisciplinary
Debashish Das, Ioannis Chasiotis
Summary: The study reveals that the adhesion force between PAN nanofibers is rate-dependent, with the adhesion work increasing with the unloading rate. The extended M-D elastic contact model successfully captures the normal pull-off force instabilities and the effect of the unloading rate in agreement with experimental results, suggesting fast relaxations in the contact region.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Nanoscience & Nanotechnology
Ling Tong, Jun Yuan, Zhiwei Zhang, Jau Tang, Zhiwei Wang
Summary: This study presents a centred dark-field imaging approach based on ultrafast transmission electron microscopy to directly observe the picosecond-scale evolution of intrananoparticle vibration with high spatial resolution and detection sensitivity.
NATURE NANOTECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Tommy Stormberg, Yuri L. Lyubchenko
Summary: In this study, the structure and properties of CENP-A nucleosomes on DNA substrates were investigated using Atomic Force Microscopy. The findings suggest that DNA sequence and histone composition are important factors in accurate centromere assembly.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Mathematics, Applied
Zhangna Xue, Gongqi Cao, Jianlin Liu
Summary: A size-dependent thermoelastic model is established based on nonlocal dual-phase-lag heat conduction and Eringen's nonlocal elasticity, applied to the analysis of a finite bi-layered nanoscale plate under a sudden thermal shock. The results show that the introduction of elastic and thermal nonlocal parameters affect the displacement, deformation, and compressive stress differently in each layer, which may be beneficial to the design of nano-sized and multi-layered devices.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2021)
Article
Materials Science, Multidisciplinary
Nanna Zhou Hagstrom, Rahul Jangid, Meera Madhavi, Diego Turenne, Jeffrey A. Brock, Erik S. Lamb, Boyan Stoychev, Justine Schlappa, Natalia Gerasimova, Benjamin Van Kuiken, Rafael Gort, Laurent Mercadier, Loic Le Guyader, Andrey Samartsev, Andreas Scherz, Giuseppe Mercurio, Hermann A. Durr, Alexander H. Reid, Monika Arora, Hans T. Nembach, Justin M. Shaw, Emmanuelle Jal, Eric E. Fullerton, Mark W. Keller, Roopali Kukreja, Stefano Bonetti, Thomas J. Silva, Ezio Iacocca
Summary: The study reveals that the ultrafast response of magnetic domain patterns is related to spatial features, and far-from-equilibrium magnetization dynamics offer alternative pathways for spatiotemporal manipulation of magnetism.
Article
Engineering, Marine
Andrea Peruzzi, Rien Bosma, Jan van Geel, Sven Ober
Summary: An accurate metrological investigation was conducted on the two de facto standards for deep-ocean temperature measurements, revealing inconsistencies and unexplained uncertainties in the units' calibration. The effects of pressure on the response of the units were also explored, highlighting the need for individual temperature-pressure calibration for each unit.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Instruments & Instrumentation
Tomas Ficker
Summary: The paper introduces a method for estimating the virtual emissivity of infrared thermometers, based on a comparative approach using two black body etalons with different emissivities heated to the same temperatures. The statistical uncertainty of this method is analyzed, showing that the results are acceptable with devices of sufficiently high precision.
INFRARED PHYSICS & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Enlong Li, Xiaomin Wu, Qizhen Chen, Shengyuan Wu, Lihua He, Rengjian Yu, Yuanyuan Hu, Huipeng Chen, Tailiang Guo
Summary: The NOFST, with its nanoscale channel length and unique operation mechanism, shows excellent gate control ability to improve fault tolerance and weight update properties. Use of this special device structure led to a record high recognition accuracy of 91.38% for organic field-effect synaptic transistors, offering a new pathway for developing organic neuromorphic hardware systems with high recognition accuracy.