537 citations · 861 across the 22 of their papers we have counts for
11 papers · 1 filter
Instabilities in a growing system of active particles: scalar and vector systems
Forouh Maleki, Ali Najafi
The physics of micron-scale biological colonies usually benefits from different out-of-equilibrium sources. In bacterial colonies and cellular tissues, the growth process is among…
Interaction between catalytic micro motors
Parvin Bayati, Ali Najafi
Starting from a microscopic model for a spherically symmetric active Janus particle, we study the interactions between two such active motors. The ambient fluid mediates a long ran…
Hydrodynamical random walker with chemotactic memory
H. Mohammady, B. Esckandariun, A. Najafi
A three-dimensional hydrodynamical model for a micro random walker is combined with the idea of chemotactic signaling network of E. coli. Diffusion exponents, orientational correla…
Rectified motion in an asymmetric channel: the role of hydrodynamic interactions with walls
B. Golshaei, A. Najafi
Dynamics of a Brownian particle in an asymmetric micro-channel that is subjected to an external oscillating force is numerically analyzed. In addition to the elastic collisions wit…
Entropic forces exerted on a rough wall by a grafted semiflexible polymer
Parvin Bayati, Leila Ghassab, Ali Najafi
We study the entropic force due to a fluctuating semiflexible polymer that is grafted from one end and confined by a rigid and rough wall from the other end. We show how roughness…
Rheological properties of a dilute suspension of self-propelled particles
Moslem Moradi, Ali Najafi
With a detail microscopic model for a self-propelled swimmer, we derive the rheological properties of a dilute suspension of such particles at small Peclet numbers. It is shown tha…
Buckling instability for a charged and fluctuating semiflexible polymer
Khabat Ghamari, Ali Najafi
In this article we address the problem of Euler's buckling instability in a charged semi-flexible polymer that is under the action of a compressive force. We consider this instabil…
Hydrodynamic Interactions of Spherical Particles in A Fluid Confined by A Rough And No-Slip Wall
Somaye Hosseini Rad, Ali najafi
In this article we develop a theoretical framework to study the hydrodynamic interactions in the presence of a non-flat and no-slip boundary. We calculate the influence of a small…
Hydrodynamics of a Micro-Hunter: Chemotactic Scenario
Ali Najafi
Inspired by bacterial chemotaxis we propose a hydrodynamic molecular scale hunter that can swim and find its target. The system is essentially a stochastic low Reynolds swimmer wit…
A Simplest Swimmer at Low Reynolds Number: Three Linked Spheres
Ali Najafi, Ramin Golestanian
We propose a very simple one-dimensional swimmer consisting of three spheres that are linked by rigid rods whose lengths can change between two values. With a periodic motion in a…
Forces Induced by Non-Equilibrium Fluctuations: The Soret-Casimir Effect
Ali Najafi, Ramin Golestanian
The notion of fluctuation-induced forces is generalized to the cases where the fluctuations have nonequilibrium origin. It is shown that a net force is exerted on a single flat pla…