Using surface-induced ordering to probe the isotropic-to-nematic transition for semiflexible polymers

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Semiflexible polymers undergo a weakly first order isotropic-to-nematic (IN) phase transition when the volume fraction φ is high enough that random alignment of the backbone segments is no longer viable. For semiflexible chains, the critical volume fraction φc is governed by the backbone stiffness Np. To locate the IN phase transition, we perform molecular dynamics (MD) simulations of bead-spring chains confined between two impenetrable parallel surfaces. We use the impenetrable surfaces to induce nematic-isotropic interfaces for semiflexible chains in the isotropic phase. By progressively increasing the backbone stiffness Np, we observe the propagation of surface-induced nematic order above a critical stiffness Ncp for a given φ. Using the simulation results Ncp(φ), we construct the IN phase boundry in the φ-Np plane, from which the scaling relation between φc and Np is obtained. For semiflexible chains with Np ≤ 5.78, our results suggest φc ∼ Np-1, consistent with prediction by Khokhlov and Semenov. For chains with Np ≥ 5.78, we observe a new scaling regime in which φc ∼ Np-2/3.

Original languageEnglish (US)
Pages (from-to)6141-6147
Number of pages7
JournalSoft Matter
Volume12
Issue number28
DOIs
StatePublished - Jan 1 2016

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Polymers
Stiffness
probes
Volume fraction
polymers
stiffness
Phase transitions
Molecular dynamics
scaling
beads
Computer simulation
simulation
alignment
molecular dynamics
propagation
predictions

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

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title = "Using surface-induced ordering to probe the isotropic-to-nematic transition for semiflexible polymers",
abstract = "Semiflexible polymers undergo a weakly first order isotropic-to-nematic (IN) phase transition when the volume fraction φ is high enough that random alignment of the backbone segments is no longer viable. For semiflexible chains, the critical volume fraction φc is governed by the backbone stiffness Np. To locate the IN phase transition, we perform molecular dynamics (MD) simulations of bead-spring chains confined between two impenetrable parallel surfaces. We use the impenetrable surfaces to induce nematic-isotropic interfaces for semiflexible chains in the isotropic phase. By progressively increasing the backbone stiffness Np, we observe the propagation of surface-induced nematic order above a critical stiffness Ncp for a given φ. Using the simulation results Ncp(φ), we construct the IN phase boundry in the φ-Np plane, from which the scaling relation between φc and Np is obtained. For semiflexible chains with Np ≤ 5.78, our results suggest φc ∼ Np-1, consistent with prediction by Khokhlov and Semenov. For chains with Np ≥ 5.78, we observe a new scaling regime in which φc ∼ Np-2/3.",
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Using surface-induced ordering to probe the isotropic-to-nematic transition for semiflexible polymers. / Zhang, Wenlin; Gomez, Enrique Daniel; Milner, Scott Thomas.

In: Soft Matter, Vol. 12, No. 28, 01.01.2016, p. 6141-6147.

Research output: Contribution to journalArticle

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