Abstract
Using a nanosecond pulsed electric field to induce orientation and arrangement of insulating flake particles is a novel efficient strategy, but the specific mechanism remains unclear. In this study, the dielectrophoretic motion of boron nitride nanosheets (BNNSs) in ultrapure water under a nanosecond pulsed electric field is simulated for the first time. First, the simulation theory is proposed. When the relaxation polarization time of the dielectric is much shorter than the pulse voltage width, the pulse voltage high level can be considered a short-term DC voltage. On this basis, the Arbitrary Lagrangian–Euler (ALE) method is used in the model, considering the mutual ultrapure water–BNNS particles-nanosecond pulsed electric field dielectrophoretic interaction, to study the influence of different BNNSs self-angle α and relative angle β on local orientation and global arrangement. The particles are moved by the dielectrophoretic force during the pulse voltage high level and move with the ultrapure water flow at the zero level, without their movement direction changing during this period, so the orientation angle and distance changes show step-like and wave-like curves, respectively. The model explains the basic mechanism of dielectrophoretic motion of BNNSs under a pulsed electric field and summarizes the motion law of BNNSs, providing a reference for subsequent research.
Highlights
Applying an electric field to align small particles is considered to be the most direct and simplest control method [1]
The results showed that a 20 kV pulse voltage can make the orientation degree of boron nitride nanosheets (BNNSs) reach 86%, indicating that almost all BNNSs have been oriented along the electric field direction [4]
BNNSs appear as low electric field intensity regions during orientation, so the particles moving in the low electric field direction appear to be oriented along the electric field direction
Summary
Applying an electric field to align small particles is considered to be the most direct and simplest control method [1]. Our group has previously used microsecond pulsed electric fields to study the orientation of boron nitride nanosheets (BNNSs) in epoxy resin. The results showed that a 20 kV pulse voltage can make the orientation degree of BNNSs reach 86%, indicating that almost all BNNSs have been oriented along the electric field direction [4]. Cho et al used a 40 kV nanosecond pulse voltage to successfully induce the alignment of BNNSs [5,6]. The use of a highintensity pulsed electric field to induce the orientation and arrangement of insulating flake particles can overcome the breakdown field strength of the matrix and greatly save energy [7], which is a novel and efficient strategy. Simulation can be used to explore its mechanisms and laws, to further the understanding of the process
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