Activity-induced propulsion of a vesicle

  title={Activity-induced propulsion of a vesicle},
  author={Zhiwei Peng and Tingtao Zhou and John F. Brady},
  journal={Journal of Fluid Mechanics},
Abstract Modern biomedical applications such as targeted drug delivery require a delivery system capable of enhanced transport beyond that of passive Brownian diffusion. In this work, an osmotic mechanism for the propulsion of a vesicle immersed in a viscous fluid is proposed. By maintaining a steady-state solute gradient inside the vesicle, a seepage flow of the solvent (e.g. water) across the semipermeable membrane is generated, which in turn propels the vesicle. We develop a theoretical… 
2 Citations

Forced microrheology of active colloids

Particle-tracking microrheology of dilute active (self-propelled) colloidal suspensions is studied by considering the external force required to maintain the steady motion of an immersed constant-velocity colloidal probe to show that active suspensions exhibit a swim-thinning behavior in which their microviscosity is gradually lowered from that of passive suspensions as the swim speed increases.

Encapsulated bacteria deform lipid vesicles into flagellated swimmers

The motility of the artificial cell is explained by a shape coupling between the flagella of each bacterium and the enclosing membrane tube, which constitutes a design principle for conferring motility to cell-sized vesicles and demonstrates the universality of lipid membranes as a building block in the development of new biohybrid systems.



The force on a boundary in active matter

We present a general theory for determining the force (and torque) exerted on a boundary (or body) in active matter. The theory extends the description of passive Brownian colloids to self-propelled

Acoustic trapping of active matter

The novel use of an acoustic tweezer to confine self-propelled particles in two dimensions over distances large compared with the swimmers' run length is reported, and a near-harmonic trap is developed to demonstrate the crossover from weak confinement, where the probability density is Boltzmann-like, to strong confinement,Where the density is peaked along the perimeter.

A spherical envelope approach to ciliary propulsion

  • J. Blake
  • Physics
    Journal of Fluid Mechanics
  • 1971
In this paper, an attempt has been made to model the dynamics of ciliary propulsion through the concept of an ‘envelope’ covering the ends of the numerous cilia of the microscopic organism. This

On the squirming motion of nearly spherical deformable bodies through liquids at very small reynolds numbers

A spherical deformable body can swim, at very small Reynolds numbers, by performing small oscillations of shape. However, the mean velocity of translation is a t most of the order of the square of

Advanced Transport Phenomena: Fluid Mechanics and Convective Transport Processes

1. A preview 2. Basic principles 3. Unidirectional and one-dimensional flow and heat transfer processes 4. An introduction to asymptotic approximations 5. The thin gap approximation - lubrication

Analysis of the Brinkman equation as a model for flow in porous media

The fundamental solution or Green's function for flow in porous media is determined using Stokesian dynamics, a molecular-dynamics-like simulation method capable of describing the motions and

The hydrodynamics of an active squirming particle inside of a porous container

A microswimmer placed inside of a passive lamellar vesicle can hydrodynamically induce directed motion of the vesicle so long as fluid is permitted to pass through the vesicle's surface. With an

Recent Advances in Microswimmers for Biomedical Applications

The aim of this review is to provide a summary of the reported biomedical applications of microswimmers, with focus on the most recent advances.

Active particles induce large shape deformations in giant lipid vesicles.

This combined experimental and simulation study demonstrates how self-propelled particles enclosed in giant unilamellar vesicles can induce a plethora of non-equilibrium shapes and active membrane fluctuations.