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- Title
Direct measurements of the colloidal Debye force.
- Authors
Lee, Hyang Mi; Kim, Yong Woo; Go, Eun Min; Revadekar, Chetan; Choi, Kyu Hwan; Cho, Yumi; Kwak, Sang Kyu; Park, Bum Jun
- 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. The Debye interaction is defined as the attraction between a polar molecule and a nonpolar molecule, which governs many self-assembling processes in materials. Here, Lee et al. design a like-charged colloidal model at the water-oil interface to characterize the Debye interaction for the first time.
- Subjects
POLAR molecules; OIL-water interfaces; OPTICAL tweezers; BIOMATERIALS; MANUFACTURING processes; COLLOIDAL crystals; POLYMERS; DIPOLE interactions; DIPOLE-dipole interactions
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-39561-8