Layering of bidisperse charged nanoparticles in sedimentation

Xu, Xufeng; Biesheuvel, P.M.; Cölfen, Helmut; Spruijt, Evan

doi:10.1039/d0sm00588f

Soft Matter

2020

DOI: 10.1039/d0sm00588f

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Layering of bidisperse charged nanoparticles in sedimentation

Xufeng Xu

P.M. Biesheuvel

Helmut Cölfen

et al.

Abstract: The layering of nanoparticles can be quantitatively in situ measured and tuned, which agrees very well with the theoretical calculations.

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2023

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Cited by 2 publications

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References 34 publications

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“… 28 and, more recently, ref. 29 on sedimentation in charged colloidal mixtures. However, in both experimental works, no Brazil-nut effect was observed, presumably because the system parameters were not sufficiently extreme to be in the Brazil-nut regime.…”

mentioning

confidence: 99%

Realization of the Brazil-nut effect in charged colloids without external driving

Linden¹,

Everts

Roij

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Sedimentation is a ubiquitous phenomenon across many fields of science, such as geology, astrophysics, and soft matter. Sometimes, sedimentation leads to unusual phenomena, such as the Brazil-nut effect, where heavier (granular) particles reside on top of lighter particles after shaking. We show experimentally that a Brazil-nut effect can be realized in a binary colloidal system of long-range repulsive charged particles driven purely by Brownian motion and electrostatics without the need for activity. Using theory, we argue that not only the mass-per-charge for the heavier particles needs to be smaller than the mass-per-charge for the lighter particles but also that at high overall density, the system can be trapped in a long-lived metastable state, which prevents the occurrence of the equilibrium Brazil-nut effect. Therefore, we envision that our work provides valuable insights into the physics of strongly interacting systems, such as partially glassy and crystalline structures. Finally, our theory, which quantitatively agrees with the experimental data, predicts that the shapes of sedimentation density profiles of multicomponent charged colloids are greatly altered when the particles are charge-regulating with more than one ion species involved. Hence, we hypothesize that sedimentation experiments can aid in revealing the type of ion adsorption processes that determine the particle charge and possibly the value of the corresponding equilibrium constants.

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mentioning

confidence: 99%

Realization of the Brazil-nut effect in charged colloids without external driving

Linden¹,

Everts

Roij

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Characterising the sedimentation of bidisperse colloidal silica using analytical centrifugation

Chen¹,

Jia²,

Fairweather³

et al. 2023

Advanced Powder Technology

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Layering of bidisperse charged nanoparticles in sedimentation

Abstract: The layering of nanoparticles can be quantitatively in situ measured and tuned, which agrees very well with the theoretical calculations.

Cited by 2 publications

References 34 publications

Realization of the Brazil-nut effect in charged colloids without external driving

Realization of the Brazil-nut effect in charged colloids without external driving

Characterising the sedimentation of bidisperse colloidal silica using analytical centrifugation

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