2D colloids in rotating electric fields: A laboratory of strong tunable three-body interactions

Yakovlev, Egor V.; Kryuchkov, Nikita P.; Korsakova, Sofia A.; Dmitryuk, Nikita A.; Ovcharov, Pavel V.; Andronic, Mihail; Rodionov, Ilya A.; Sapelkin, Andrei V.; Yurchenko, Stanislav O.

doi:10.1016/j.jcis.2021.09.116

Cited by 17 publications

(12 citation statements)

References 73 publications

(169 reference statements)

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“…In this case, the liquid state on the binodal between triple and critical point can be realized by changing the magnitude of applied rotating field. Moreover, the interactions in such systems have been shown recently to include essentially many-body component [43][44][45][46][47] , which can be tuned with conically-rotating external fields.…”

Section: Discussionmentioning

confidence: 99%

Diffusion mobility increases linearly on liquid binodals above triple point

Dmitryuk

Mistryukova

Kryuchkov

et al. 2023

Sci Rep

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Self-diffusion in fluids has been thoroughly studied numerically, but even for simple liquids just a few scaling relationships are known. Relations between diffusion, excitation spectra, and character of the interparticle interactions remain poorly understood. Here, we show that diffusion mobility of particles in simple fluids increases linearly on the liquid branch of the liquid–gas binodal, from the triple point almost up to the critical point. With molecular dynamics simulations, we considered bulk systems of particles interacting via a generalised Lennard–Jones potential, as well as ethane. Using a two-oscillator model for the analysis of excitations, we observed that the mobility (inverse diffusion) coefficient on the liquid–gas binodal increases linearly above the triple point until the dispersion of high-frequency spectra has a solid-like (oscillating) shape. In terms of a separate mode analysis (of longitudinal and transverse modes), this corresponds to crossed modes in the intermediate range of wavenumbers q, between the hydrodynamic regime (small q) and the regime of individual particle motion (large q). The results should be interesting for a broad community in physics and chemistry of fluids, since self-diffusion is among the most fundamental transport phenomena, important for prospective chemical technologies, micro-, nanofluidics, and biotechnologies.

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Section: Discussionmentioning

confidence: 99%

Diffusion mobility increases linearly on liquid binodals above triple point

Dmitryuk

Mistryukova

Kryuchkov

et al. 2023

Sci Rep

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“…The main conclusions related to the scenario of phase transitions in a system with dipolar attraction can be tested in future experiments with colloidal systems, wherein the tunable long-range dipolar attraction can be created with rotating magnetic or electric fields. A nontrivial question here is related to the role of threebody forces, inherent in atomic materials and tunable colloids 78,79 . LJ-like interactions can be created with magic hodographs of rotating electric or magnetic fields 84 .…”

Section: Discussionmentioning

confidence: 99%

“…These collective phenomena can be visualized in real-time with spatial resolution of individual particles. Long-range dipolar attraction ∝ 1/r 3 in colloidal systems can be induced and controlled in situ with in-plane rotating magnetic [67][68][69][70][71] or electric [72][73][74][75][76][77][78][79] fields. Using conically-rotating magnetic or electric fields with magic angles, Van-der-Waals-like attraction can be created ∝ 1/r 6 with "magic" fields [80][81][82][83] .…”

Section: Introductionmentioning

confidence: 99%

The role of attraction in the phase diagrams and melting scenarios of generalized 2D Lennard-Jones systems

Tsiok,

Fomin,

Gaiduk

et al. 2021

Preprint

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Monolayer and two-dimensional (2D) systems exhibit rich phase behavior, compared with 3D systems, in particular, due to the hexatic phase playing a central role in melting scenarios. The attraction range is known to affect critical gas-liquid behavior (liquid-liquid in protein and colloidal systems), but the effect of attraction on melting in 2D systems remains unstudied systematically. Here, we reveal how the attraction range affects the phase diagrams and melting scenarios in a 2D system. Using molecular dynamics simulations we considered the generalized Lennard-Jones system with a fixed repulsion branch and different power indices of attraction, from long-range dipolar to short-range sticky-spheres-like. A drop in the attraction range has been found to reduce the temperature of the gas-liquid critical point, bringing it closer to the gas-liquid-solid triple point. At high-temperatures, attraction does not affect the melting scenario that proceeds through the cascade of solid-hexatic (Berezinski-Kosterlitz-Thouless) and hexatic-liquid (first-order) phase transitions. In the case of dipolar attraction, we observed two triple points, inherent in a 2D system: hexatic-liquid-gas and crystal-hexatic-gas, the temperature of the crystal-hexatic-gas triple point is below the hexatic-liquid-gas triple point. This observation may have far-reaching consequences for future studies, since phase diagrams determine possible routes of self-assembly in molecular, protein, and colloidal systems, whereas the attraction range can be adjusted with complex solvents and external electric or magnetic fields. The results obtained may be widely used in condensed matter, chemical physics, materials science, and soft matter.

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“…Rotating electric fields have been widely used in many fields as an effective means of manipulating micro- and nanoscale fluids. The actuation of dipole molecules by rotating electric fields can power nanomotors or molecular motors. − In the biomedical field, rotating electric fields can be used to rotate cells, capsules, and micro- and nanobiological machines. − In other aspects, the rotating electric fields can also be used for electropumping of water in nanochannels, − curling of graphene nanoribbons, and colloidal particle self-assembly, − etc.…”

Section: Introductionmentioning

confidence: 99%

Droplet Rolling Transport on Hydrophobic Surfaces Under Rotating Electric Fields: A Molecular Dynamics Study

Liu,

Jing

2023

Langmuir

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Driving droplets by electric fields is usually achieved by controlling their wettability, and realizing a flexible operation requires complex electrode designs. Here, we show by molecular dynamics methods the droplet transport on hydrophobic surfaces in a rolling manner under a rotating electric field, which provides a simpler and promising way to manipulate droplets. The droplet internal velocity field shows the rolling mode. When the contact angle on the solid surface is 144.4°, the droplet can be transported steadily at a high velocity under the rotating electric field (E = 0.5 V nm −1 , ω = π/20 ps −1 ). The droplet center-of-mass velocities and trajectories, deformation degrees, dynamic contact angles, and surface energies were analyzed regarding the electric field strength and rotational angular frequency. Droplet transport with a complex trajectory on a two-dimensional surface is achieved by setting the electric field, which reflects the programmability of the driving method. Nonuniform wettability stripes can assist in controlling droplet trajectories. The droplet transport on the three-dimensional surface is studied, and the critical conditions for the droplet passing through the surface corners and the motion law on the curved surface are obtained. Droplet coalescence has been achieved by surface designs.

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2D colloids in rotating electric fields: A laboratory of strong tunable three-body interactions

Cited by 17 publications

References 73 publications

Diffusion mobility increases linearly on liquid binodals above triple point

Diffusion mobility increases linearly on liquid binodals above triple point

The role of attraction in the phase diagrams and melting scenarios of generalized 2D Lennard-Jones systems

Droplet Rolling Transport on Hydrophobic Surfaces Under Rotating Electric Fields: A Molecular Dynamics Study

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