RSC_Journal of Materials Chemistry A

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RSC_Journal of Materials Chemistry A_ Front cover Picture


14 December 2020, Issue 46
Page 16245 to 16616


Rotation of charged polymer particles for potential applications in micro-propulsion systems


The possibility of an interelectrode oscillation behavior of dielectric dispersoids in colloidal dispersion by electric stimuli has been suggested but has not yet been reported. Here, we present a strategy for inducing the oscillation behavior based on dielectric constant (ε)-matching and conductivity (σ)-mismatching techniques between the dispersoids and dispersion medium. One of the electrophoresis-based bio-microparticles, Nannochloropsis gaditana (N. gaditana, ε ≈ 2.9–3.7), and olive oil, which has a similar dielectric constant (ε ≈ 3.1), were selected as dispersoid and dispersion medium, respectively. The conductivity mismatch was formed by controlling the temperature of the suspension. As the temperature increased from 25 to 50, 75, and 100 °C, the conductivity mismatch increased exponentially from 0.20 to 0.57, 2.17, and 11.95 (× 10−4 μS m−1). The anaphoretic separation behavior of the dispersoids by electric stimuli, which was shown at 25 °C, changed to interelectrode oscillation behavior at 100 °C due to their high conductivity mismatch, as we expected.



  • Taegu Do
  • Youngsang Chun
  • Youngkyun Jung
  • Ung Su Choi
  • Yong-Sung Parkc
  • Young Gun Ko



https://pubs.rsc.org/en/journals/journalissues/tc#!issueid=tc008046&type=current&issnprint=2050-75267488


Image created by minjeong Kim / Nanosphere