Generation of mechanical force by grafted polyelectrolytes in an electric field: application to polyelectrolyte-based nano-devices: Application to polyelectrolyte-based nano-devices

N. V. Brilliantov, Yu A. Budkov, C. Seidel

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We analyse theoretically and by means of molecular dynamics (MD) simulations the generation of mechanical force by a polyelectrolyte (PE) chain grafted to a plane. The PE is exposed to an external electric field that favours its adsorption on the plane. The free end of the chain is linked to a deformable target body. By varying the field, one can alter the length of the non-adsorbed part of the chain. This entails variation of the deformation of the target body and hence variation of the force arising in the body. Our theoretical predictions for the generated force are in very good agreement with the MD data. Using the theory developed for the generated force, we study the effectiveness of possible PEbased nano-vices, composed of two clenching planes connected by PEs and exposed to an external electric field. We exploit the Cundall-Strack solid friction model to describe the friction between a particle and the clenching planes. We compute the diffusion coefficient of a clenched particle and show that it drastically decreases even in weak applied fields. This demonstrates the efficacy of the PE-based nano-vices, which may be a possible alternative to the existing nanotube nano-tweezers and optical tweezers.

Original languageEnglish
Article number20160143
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume374
Issue number2080
DOIs
Publication statusPublished - 13 Nov 2016
Externally publishedYes

Keywords

  • Diffusion
  • Nano-mechanics
  • Polyelectrolytes

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