Negative resistance for colloids driven over two barriers in a microchannel

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2021
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Zimmermann, Urs
Löwen, Hartmut
Smallenburg, Frank
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Soft Matter ; 17 (2021), 3. - pp. 516-522. - Royal Society of Chemistry. - ISSN 1744-683X. - eISSN 1744-6848
Abstract
When considering the flow of currents through obstacles, one core expectation is that the total resistance of sequential single resistors is additive. While this rule is most commonly applied to electronic circuits, it also applies to other transport phenomena such as the flow of colloids or nanoparticles through channels containing multiple obstacles, as long as these obstacles are sufficiently far apart. Here we explore the breakdown of this additivity for fluids of repulsive colloids driven over two energetic barriers in a microchannel, using real-space microscopy experiments, particle-resolved simulations, and dynamical density functional theory. If the barrier separation is comparable to the particle correlation length, the resistance is highly non-additive, such that the resistance added by the second barrier can be significantly higher or lower than that of the first. Surprisingly, in some cases the second barrier can even add a negative resistance, such that two identical barriers are easier to cross than a single one. We explain this counterintuitive observation in terms of the structuring of particles trapped between the barriers.
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530 Physics
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ISO 690ZIMMERMANN, Urs, Hartmut LÖWEN, Christian KREUTER, Artur ERBE, Paul LEIDERER, Frank SMALLENBURG, 2021. Negative resistance for colloids driven over two barriers in a microchannel. In: Soft Matter. Royal Society of Chemistry. 17(3), pp. 516-522. ISSN 1744-683X. eISSN 1744-6848. Available under: doi: 10.1039/D0SM01700K
BibTex
@article{Zimmermann2021Negat-53025,
  year={2021},
  doi={10.1039/D0SM01700K},
  title={Negative resistance for colloids driven over two barriers in a microchannel},
  number={3},
  volume={17},
  issn={1744-683X},
  journal={Soft Matter},
  pages={516--522},
  author={Zimmermann, Urs and Löwen, Hartmut and Kreuter, Christian and Erbe, Artur and Leiderer, Paul and Smallenburg, Frank}
}
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