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The effect of micro-vessel viscosity on the resonance response of a two-microbubble system.
Ultrasonics
December 2024
Department of Physics, Concordia University, Montreal, Quebec H4B 1R6, Canada; Department of Biology, Concordia University, Montreal, Quebec H4B 1R6, Canada. Electronic address:
Clinical ultrasound contrast agent microbubbles remain intravascular and are between 1-8 µm in diameter, with a volume-weighted mean size of 2-3 µm. Despite their worldwide clinical utility as a diagnostic contrast agent, and their continued and ongoing success as a local therapeutic vector, the fundamental interplay between microbubbles - including bubble-bubble interaction and the effects of a neighboring viscoelastic vessel wall, remain poorly understood. In this work, we developed a finite element model to study the physics of the complex system of two different-sized bubbles (2 and 3 µm in diameter) confined within a viscoelastic vessel from a resonance response perspective (3-12 MHz).
View Article and Find Full Text PDFThin liquid films stabilized by plant proteins: Implications for foam stability.
J Colloid Interface Sci
December 2024
Laboratory of Biobased Chemistry and Technology, Wageningen University, Bornse Weilanden 9, Wageningen, 6708WG, Netherlands.
Hypothesis: Plant-based proteins offer a sustainable solution for stabilizing multiphase food materials like edible foams and emulsions. However, challenges in understanding and engineering plant protein-stabilized interfaces persist, mostly because of the commonly poorer functionality and complex composition of the respective protein isolates. We hypothesize that part of the limited understanding is related to the lack of experimental data on the length-scale of the thin liquid film that separates two neighboring bubbles.
View Article and Find Full Text PDFDipole-to-monopole-flow transition in bubbly thermal convection.
Phys Rev E
November 2024
Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Uttar Pradesh 208106, India.
The hydrodynamic and thermal interactions between neighboring vapor bubbles on hot surfaces play a crucial role in heat transport and flow characteristics. To investigate these interactions, we conducted numerical simulations of saturated vapor bubbles in a two-dimensional square enclosure filled with liquid water. The water was heated at the bottom and cooled at the top to replicate boiling at 100^{∘}C and normal atmospheric pressure.
View Article and Find Full Text PDFDNA Gene's Basic Structure as a Nonperturbative Circuit Quantum Electrodynamics: Is RNA Polymerase II the Quantum Bus of Transcription?
Curr Issues Mol Biol
October 2024
Research and Higher Education Center of UNEPROP, Hermosillo 83105, Mexico.
Previously, we described that Adenine, Thymine, Cytosine, and Guanine nucleobases were superconductors in a quantum superposition of phases on each side of the central hydrogen bond acting as a Josephson Junction. Genomic DNA has two strands wrapped helically around one another, but during transcription, they are separated by the RNA polymerase II to form a molecular condensate called the transcription bubble. Successive steps involve the bubble translocation along the gene body.
View Article and Find Full Text PDFElectrically switched asymmetric interfaces for liquid manipulation.
Mater Horiz
October 2024
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry, Beihang University, Beijing 100191, P. R. China.
External field driven fluid manipulation, in particular electric field, offers the advantages of real-time control and exceptional flexibility, rendering it highly promising for applications in microfluidic devices, liquid separation and energy catalysis. However, it is still challenging for controlled liquid transport and fine control of droplet splitting. Herein, we demonstrate a strategy to achieve direction-controlled liquid transport and fine droplet splitting on an anisotropic groove-microstructured electrode surface an electrically switched asymmetric interface.
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