974 citations · 1.9k across the 32 of their papers we have counts for
21 papers · 1 filter
Estimation of spatial and time scales of collective behaviors of active matters through learning hydrodynamic equations from particle dynamics
Bappaditya Roy, Natsuhiko Yoshinaga
We present a data-driven framework for learning hydrodynamic equations from particle-based simulations of active matter. Our method leverages coarse-graining in both space and time…
Dynamic control of self-assembly of quasicrystalline structures through reinforcement learning
Uyen Tu Lieu, Natsuhiko Yoshinaga
We propose reinforcement learning to control the dynamical self-assembly of the dodecagonal quasicrystal (DDQC) from patchy particles. The patchy particles have anisotropic interac…
Formation and Fluctuation of Two-dimensional Dodecagonal Quasicrystal
Uyen Tu Lieu, Natsuhiko Yoshinaga
The self-assembly of two-dimensional dodecagonal quasicrystal (DDQC) from patchy particles are investigated by Brownian dynamics simulations. The patchy particle has a five-fold ro…
Inverse design of two-dimensional structure by self-assembly of patchy particles
Uyen Tu Lieu, Natsuhiko Yoshinaga
We propose an optimisation method for the inverse structural design of self-assembly of anisotropic patchy particles. The anisotropic interaction can be expressed by the spherical…
Bayesian Modelling of Pattern Formation from One Snapshot of Pattern
Natsuhiko Yoshinaga, Satoru Tokuda
Partial differential equations (PDE) have been widely used to reproduce patterns in nature and to give insight into the mechanism underlying pattern formation. Although many PDE mo…
Topological defects of dipole patchy particles on a spherical surface
Uyen Tu Lieu, Natsuhiko Yoshinaga
We investigate the assembly of the dipole-like patchy particles confined to a spherical surface by Brownian dynamics simulations. The surface property of the spherical particle is…
Self-propulsion of an active polar drop
Natsuhiko Yoshinaga
We investigate the self-propulsive motion of a drop containing an active polar field. The drop demonstrates spontaneous symmetry breaking from a uniform orientational order into a…
From hydrodynamic lubrication to many-body interactions in dense suspensions of active swimmers
Natsuhiko Yoshinaga, Tanniemola B. Liverpool
We study how hydrodynamic interactions affect the collective behaviour of active particles suspended in a fluid at high concentrations, with particular attention to lubrication for…
Large-scale chirality in an active layer of microtubules and kinesin motor proteins
Kyongwan Kim, Natsuhiko Yoshinaga, Sanjib Bhattacharyya +3
During the early developmental process of organisms, the formation of the left-right laterality requires a subtle mechanism, as it is associated with other principal body axes. Any…
Hydrodynamic interactions in dense active suspensions: from polar order to dynamical clusters
Natsuhiko Yoshinaga, Tanniemola B. Liverpool
We study the role of hydrodynamic interactions in the collective behaviour of collections of microscopic active particles suspended in a fluid. We introduce a novel calculational f…
Spontaneous motion and deformation of a self-propelled droplet
Natsuhiko Yoshinaga
The time evolution equation of motion and shape are derived for a self-propelled droplet driven by a chemical reaction. The coupling between the chemical reaction and motion makes…
Rotational motion of a droplet induced by interfacial tension
Ken H. Nagai, Fumi Takabatake, Yutaka Sumino +3
Spontaneous rotation of a droplet induced by the Marangoni flow is analyzed in a two-dimensional system. The droplet with the small particle which supplies a surfactant at the inte…
Drift instability in the motion of a fluid droplet with a chemically reactive surface driven by Marangoni flow
Natsuhiko Yoshinaga, Ken H. Nagai, Yutaka Sumino +1
We theoretically derive the amplitude equations for a self-propelled droplet driven by Marangoni flow. As advective flow driven by surface tension gradient is enhanced, the station…
Spontaneous motion of a droplet coupled with a chemical wave
Hiroyuki Kitahata, Natsuhiko Yoshinaga, Ken H. Nagai +1
We propose a novel framework for the spontaneous motion of a droplet coupled with internal dynamic patterns generated in a reaction-diffusion system. The spatio-temporal order of t…
Active Motion of Janus Particle by Self-thermophoresis in Defocused Laser Beam
Hong-Ren Jiang, Natsuhiko Yoshinaga, Masaki Sano
We study self-propulsion of a half-metal coated colloidal particle under laser irradiation. The motion is caused by self-thermophoresis: i.e. absorption of laser at the metal-coate…
Manipulation of Colloids by Nonequilibrium Depletion Force in Temperature Gradient
Hong-Ren Jiang, Hirofumi Wada, Natsuhiko Yoshinaga +1
The non-equilibrium distribution of colloids in a polymer solution under a temperature gradient is studied experimentally. A slight increase of local temperature by a focused laser…
Dynamics of Polymer Decompression: Expansion, Unfolding and Ejection
Takahiro Sakaue, Natsuhiko Yoshinaga
The dynamics of polymer decompression, i.e., a process from compressed, compact state to the relaxed swoll en conformation, can be formally described as a {\it nonlinear diffusion}…
On the Adsorption of Two-State Polymers
Natsuhiko Yoshinaga, Efim Kats, Avraham Halperin
Monte Carlo(MC) simulations produce evidence that annealed copolymers incorporating two interconverting monomers, P and H, adsorb as homopolymers with an effective adsorption energ…
Folding and unfolding kinetics of a single semiflexible polymer
Natsuhiko Yoshinaga
We theoretically investigate the kinetics of the folding transition of a single semiflexible polymer. In the folding transition, the growth rate decrease with an increase in the nu…
Core-shell structures in single flexible-semiflexible block copolymers: Finding the free energy minimum for the folding transition
Natsuhiko Yoshinaga, Kenichi Yoshikawa
We investigate the folding transition of a single diblock copolymer consisting of a semiflexible and a flexible block. We obtain a {\it Saturn-shaped} core-shell conformation in th…
Different pathways in mechanical unfolding/folding cycle of a single semiflexible polymer
Natsuhiko Yoshinaga, Kenichi Yoshikawa, Takao Ohta
Kinetics of conformational change of a semiflexible polymer under mechanical external field were investigated with Langevin dynamics simulations. It is found that a semiflexible po…