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We analytically show that the interfacial fluid's molecular dynamics of capillary bridges induces both elastic and dissipative forces to the shearing plane. Surprisingly, the nanometer-sized, liquid-solid contact line of the bridges exerts a giant "shear" force on the solid surface, which is 10^{5} higher than the usual viscous interaction and comparable to that of solid-solid direct-contact friction. These results are consistent with previously reported experimental data and may provide clues to longstanding questions on the apparent viscosity of the nanoconfined fluids.
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http://dx.doi.org/10.1103/PhysRevE.105.065108 | DOI Listing |
Micromachines (Basel)
July 2025
Holcombe Department of Electrical and Computer Engineering, Clemson University, Clemson, SC 29634, USA.
Synthetic nanopores were recently demonstrated with memristive and nonlinear voltage-current behaviors, akin to ion channels in a cell membrane. Such ionic devices are considered a promising candidate for the development of brain-inspired neuromorphic computing techniques. In this work, we show the composite behavior of nanopore-array large memristors, formed with different membrane materials, pore sizes, electrolytes, and device arrangements.
View Article and Find Full Text PDFACS Nano
February 2025
Division of Electrical, Electronic and Infocommunications Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan.
Electrostriction is present in all dielectrics, but the electrostriction itself is generally minuscule and is even insignificant in low-dielectric-constant materials. Herein, extraordinary electrostriction is found in mesomorphic blue phase (BP) crystals, which are fluidic "giant" crystals with a lattice constant of several hundred nanometers and contain 10-10 molecules in each unit cell. In situ optical observations revealed that the BP crystals exhibit -19.
View Article and Find Full Text PDFLab Chip
February 2025
Institute of Translational Medicine, Department of Health Sciences and Technology, ETH Zürich, 8092 Zürich, Switzerland.
Proteases, an important class of enzymes that cleave proteins and peptides, carry a wealth of potentially useful information. Devices to enable routine and cost effective measurement of their activity could find frequent use in clinical settings for medical diagnostics, as well as some industrial contexts such as detecting on-line biological contamination. In particular, devices that make use of readouts involving magnetic particles may offer distinct advantages for continuous sensing because material they release can be magnetically captured downstream and their readout is insensitive to optical properties of the sample.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
December 2024
Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan.
J Liposome Res
June 2025
Department of Precision Mechanics, Faculty of Science and Engineering, Chuo University, Tokyo, Japan.
Giant liposomes, or giant unilamellar vesicles (GUVs), have been utilized as cell-size bioreactors to replicate the physical and chemical properties of biological cells. However, conventional methods for preparing GUVs typically lack precise control over their size. Several research groups have recently developed microfluidic techniques to create monodisperse GUVs by generating water-in-oil-in-water (W/O/W) droplets with a thin oil layer that subsequently transform into GUVs.
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