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Chiral Lemniscate Formation in Magnetic Field Controlled Topological Fluid Flows.
Matt Jellicoe1, Zoe Gardner1, Amjad E H Alotaibi1
1Flinders Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Bedford Park, SA, 5042, Australia.
Small (Weinheim an Der Bergstrasse, Germany)
|April 3, 2025
Summary
Rapidly rotating fluid flow in a vortex fluidic device (VFD) forms chiral structures, influenced by Earth's magnetic field. Chirality can be controlled by device orientation and location.
Area of Science:
- Fluid dynamics
- Materials science
- Nanotechnology
Background:
- Vortex fluidic devices (VFDs) enable unique fluid behaviors under rotation.
- Single-walled carbon nanotubes (SWCNTs) exhibit chirality, a critical property in molecular science.
- Earth's magnetic field can influence nanoscale phenomena.
Purpose of the Study:
- To investigate the formation and control of chiral structures in high shear spinning top (ST) flows.
- To understand the influence of rotation, device geometry, and external magnetic fields on fluid chirality.
- To determine the absolute chirality of resultant structures using advanced microscopy.
Main Methods:
- Utilizing a rapidly rotating inclined tube within a VFD to generate ST fluid flow.
- Employing scanning electron microscopy (SEM) and atomic force microscopy (AFM) for structural analysis.
- Manipulating tube orientation relative to Earth's magnetic field (BE) and geographical location.
Main Results:
- High shear ST flow approaches homochirality, forming chiral lemniscate structures from SWCNTs.
- The absolute chirality (R- or S-structures) depends on the direction of tube rotation (CW or CCW).
- Earth's magnetic field (BE) impacts lemniscate formation, and chirality can be flipped by altering tube orientation relative to BE.
Conclusions:
- The study demonstrates the ability to control and determine the absolute chirality of fluid flows and nanostructures.
- Resultant chiral lemniscates in ST flow establish the absolute chirality of inner and outer flow components.
- Special conditions reveal interactions between fluid flow dynamics, Coriolis forces, Faraday waves, and the geomagnetic field.
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