Direct measurements of the colloidal Debye force

Hyang Mi Lee, Yong Woo Kim, Eun Min Go, Chetan Revadekar, Kyu Hwan Choi, Yumi Cho, Sang Kyu Kwak () and Bum Jun Park ()
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Hyang Mi Lee: Kyung Hee University
Yong Woo Kim: Kyung Hee University
Eun Min Go: Ulsan National Institute of Science and Technology
Chetan Revadekar: Kyung Hee University
Kyu Hwan Choi: Kyung Hee University
Yumi Cho: Ulsan National Institute of Science and Technology
Sang Kyu Kwak: Korea University
Bum Jun Park: Kyung Hee University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-39561-8

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