In this paper, we present a simple and accurate lattice Boltzmann (LB) model for immiscible two-phase flows, which is able to deal with large density contrasts. This utilizes two LB equations, one of used solve the conservative Allen-Cahn equation, other adopted incompressible Navier-Stokes equations. A forcing distribution function elaborately designed in equation make it much simpler than existing models. addition, proposed can achieve superior numerical accuracy compared previous type...

Abstract Recent studies have shown that active colloidal motors using enzymatic reactions for propulsion hold special promise applications in fields ranging from biology to material science. It will be desirable colloids with capability of computation so they can act autonomously sense their surroundings and alter own dynamics. is how small chemical networks make use on the colloid surface used construct motor‐based logic gates. The basic features coupled are responsible underlie...

Abstract Very small synthetic motors that use chemical reactions to drive their motion are being studied widely because of potential applications, which often involve active transport and dynamics on nanoscales. Like biological molecular machines, they must be able perform tasks in complex, highly fluctuating environments can form patterns with diverse structures. Motors such systems actively assemble into dynamic clusters other unique nonequilibrium states. It is shown how characteristic...

Active matter, some of whose constituent elements are active agents that can move autonomously, behaves very differently from matter without such agents. The self-assemble into structures with a variety forms and dynamical properties. Swarming, where groups living cooperatively, is commonly observed in the biological realm, but it also seen physical realm systems containing small synthetic motors. existence diverse self-assembled has stimulated search for new applications involve matter. We...

A strategy for separating small suspending colloids by means of their surfing on substrate chemical wavefronts is put forward.

Graphene quantum dots (GQDs), a new quasi-zero-dimensional nanomaterial, have the advantages of smaller transverse size, better biocompatibility, and lower toxicity. They potential applications in biosensors, drug delivery, biological imaging. Therefore, it is particularly important to understand transport mechanism GQDs on cell membrane. In particular, effect GQD shapes translocation should be well understood. this study, permeation process with different through...

The drift behavior of spiral waves under the influence a polarized electric field is investigated in light that both and possess rotation symmetry. Numerical simulations reaction-diffusion model show velocity tip can be controlled by changing polarization mode some interesting phenomena are observed. When circularly its follows spiral, speed reaches maximal value. On contrary, opposite between locks tip. Analytical results based on weak deformation approximation consistent with numerical...

A chemically powered nanodimer motor interacting with a chemical wave results in the deflection of nanomotor (see picture). Such an effect provides possible mechanism for control motion. Detailed facts importance to specialist readers are published as "Supporting Information". documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note: The publisher is responsible content functionality any supporting information supplied Any queries (other...

Control of turbulence in two kinds typical heterogeneous excitable media by applying a combined method is investigated. It found that local-low-amplitude and high-frequency pacing (LHP) effective to suppress if the deviation heterogeneity minor. However, LHP invalid when large. Studies show an additional radial electric field can greatly increase efficiency LHP. The underlying mechanisms successful control cases are different discussed separately. Since developed strategy combining with...

Spiral waves may be pinned to anatomical heterogeneities in the cardiac tissue, which leads monomorphic ventricular tachycardia. Wave emission from (WEH) induced by electric pulses one direction (EP) is a promising method for liberating such using as internal virtual pacing sites. Here, based on WEH effect, new mechanism of liberation means rotating pulse (REP) proposed generic model excitable media. Compared with EP, REP has advantage opening wider time window liberate spiral. The...

Synthetic chemically powered nanomotors possessing the ability of chemotaxis are desirable for target cargo delivery and self-assembly. The chemotactic properties a sphere dimer motor, composed linked catalytic inactive monomers, studied in gradient field fuel. Particle-based simulation is carried out by means hybrid molecular dynamics/multiparticle collision dynamics. detailed tracking motion analysis describing running tumbling motor process investigated. Physical factors affecting...

The termination of pinned spirals on a defect by means local stimuli is studied. On completely unexcitable defect, the elimination process discussed and its corresponding mechanism presented. Especially, unpinning partially which has not been investigated so far, explored. With fixed pacing frequency ω L , there exists maximal radius R max above spiral cannot be removed. It found that value does increase as in dynamical regime, forming platform curves. Based analyzing dispersion relation tip...

The dynamics of chemically powered sphere dimers at the micro- and nano-scales confined in a quasi-two-dimensional geometry are investigated.

Suppression of spiral and turbulence in inhomogeneous media due to local heterogeneity with higher excitability is investigated numerically. When the inhomogeneity small, control tactics by boundary periodic forcing (BPF) effective against existing turbulence. large, a rotating electric field (REF) utilized ``smooth'' regional based on driven synchronization. Consequently, approach combining BPF REF proposed suppress The underlying mechanism successful suppression discussed terms dispersion relation.

A particle-based mesoscopic model for enzyme kinetics is constructed and used to investigate the influence of diffusion on reactive dynamics. Enzymes enzyme-substrate complexes are modeled as finite-size soft spherical particles, while substrate, product, solvent molecules point particles. The system evolved using a hybrid molecular dynamics-multiparticle collision dynamics scheme. Both nonreactive satisfy mass, momentum, energy conservation laws, reversible reaction steps detailed balance....

In a generic model of excitable media, we simulate wave emission from heterogeneity (WEH) induced by an electric field. Based on the WEH effect, rotating field is proposed to terminate existed spatiotemporal turbulence. Compared with effects resulted periodic pulsed field, displays several improvements, such as lower required intensity, emitting waves smaller obstacles, and shorter suppression time. Furthermore, due rotation it can automatically source boundary obstacle small curvature.

In a generic model of excitable media, we study the behavior spiral waves interacting with obstacles and their dynamics under influences simple periodic mechanical deformation (PMD). Depending on characteristics obstacles, i.e., size excitability, rotation pinned wave shows different scenarios, e.g., embedding into or anchoring an obstacle. Three drift phenomena induced by PMD are observed: scattering small partial-excitable meander-induced unpinning big drifting around unexcitable...

Synchronization of a spiral by circularly polarized electric field (CPEF) in reaction-diffusion systems is investigated since they both possess rotation symmetry. It found that spirals different regimes (including rigidly rotating, meandering, and drifting spirals) can be forced to rotating ones CPEFs. Moreover, the rotational frequency entrained synchronized with ratio 1:1.

The control of spiral breakup due to Doppler instability is investigated. It found that applying an alternating advective field with suitable amplitude and period can prevent the waves. Further numerical simulations show growing meandering behavior a tip caused by decreasing excitability medium be efficiently suppressed field, which inhibits waves eventually.

We study the nonequilibrium dynamics of colloidal system with short-range depletion attraction and screened electrostatic repulsion on a disordered substrate. find growth-melting process clusters as temperature is increased. By strengthening repulsion, depinning transition from moving cluster to plastic flow observed, which characterized by peak in threshold force. The corresponding phase diagram then mapped out. Due influences disorder substrate, are polarized strong external force,...