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Direct measurements of the colloidal Debye force

Author

Listed:
  • Hyang Mi Lee

    (Kyung Hee University)

  • Yong Woo Kim

    (Kyung Hee University)

  • Eun Min Go

    (Ulsan National Institute of Science and Technology
    Corning Precision Materials Co., Ltd.)

  • Chetan Revadekar

    (Kyung Hee University)

  • Kyu Hwan Choi

    (Kyung Hee University
    University of California Santa Barbara)

  • Yumi Cho

    (Ulsan National Institute of Science and Technology)

  • Sang Kyu Kwak

    (Korea University)

  • Bum Jun Park

    (Kyung Hee University)

Abstract

Colloids often behave in a manner similar to their counterparts in molecular space and are used as model systems to understand molecular behavior. Here, we study like-charged colloidal attractions between a permanent dipole on an interfacial particle and its induced dipole on a water-immersed particle caused by diffuse layer polarization. We find that the scaling behavior of the measured dipole-induced dipole (D‒I) interaction via optical laser tweezers is in good agreement with that predicted from the molecular Debye interaction. The dipole character propagates to form aggregate chains. Using coarse-grained molecular dynamic simulations, we identify the separate roles of the D‒I attraction and the van der Waals attraction on aggregate formation. The D‒I attraction should be universal in a broad range of soft matter, such as colloids, polymers, clays, and biological materials, motivating researchers to further conduct in-depth research on these materials.

Suggested Citation

  • Hyang Mi Lee & Yong Woo Kim & Eun Min Go & Chetan Revadekar & Kyu Hwan Choi & Yumi Cho & Sang Kyu Kwak & Bum Jun Park, 2023. "Direct measurements of the colloidal Debye force," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39561-8
    DOI: 10.1038/s41467-023-39561-8
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    References listed on IDEAS

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    1. Stefan Auer & Daan Frenkel, 2001. "Prediction of absolute crystal-nucleation rate in hard-sphere colloids," Nature, Nature, vol. 409(6823), pages 1020-1023, February.
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