Lehmann force acting on a micro-particle in smectic C* free-standing films subjected to methanol vapor transport

Kazuyoshi Seki, Ken Ueda, Kazuhisa Uda, Kazumasa Tsunekawa, Yuka Tabe

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    Gas permeation through smectic C* free-standing films causes a unidirectional director rotation, occasionally accompanied by a unidirectional vortex-like hydrodynamic flow. In this study, by placing ZrO2 micro-particles on the film subjected to methanol vapor transport, we observed the particle motions and measured a drag force acting on them. The particles underwent a unidirectional quasi-circular motion with the velocity linear to the methanol transfer rate with the magnitude of the drag force being on the order of several pN that increased approximately linearly with the velocity of the flow. A simple analysis shows that the conversion efficiency from the transmembrane methanol current to the drag force on the particles is ∼1.4 × 10-10 N·s·m2/mol in our system. The present hydrodynamic experiment is complementally to the previous observations of linear director rotation in the Lehmann effect, which well supports Leslie's phenomenological theory.

    Original languageEnglish
    Article number125804
    JournalJapanese Journal of Applied Physics
    Volume50
    Issue number12
    DOIs
    Publication statusPublished - 2011 Dec

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    drag
    Drag
    Methanol
    methyl alcohol
    Vapors
    vapors
    Hydrodynamics
    hydrodynamics
    particle motion
    Permeation
    Conversion efficiency
    Vortex flow
    vortices
    causes
    Gases
    gases
    Experiments

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)

    Cite this

    Lehmann force acting on a micro-particle in smectic C* free-standing films subjected to methanol vapor transport. / Seki, Kazuyoshi; Ueda, Ken; Uda, Kazuhisa; Tsunekawa, Kazumasa; Tabe, Yuka.

    In: Japanese Journal of Applied Physics, Vol. 50, No. 12, 125804, 12.2011.

    Research output: Contribution to journalArticle

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