Volume 63, Issue 24 e202403790
Research Article

Oversaturating Liquid Interfaces with Nanoparticle-Surfactants

Dr. Xuefei Wu

Dr. Xuefei Wu

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

These authors contributed to this work equally.

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Dr. Han Xue

Dr. Han Xue

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

These authors contributed to this work equally.

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Dr. Zachary Fink

Dr. Zachary Fink

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA-01003 USA

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Dr. Brett A. Helms

Dr. Brett A. Helms

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

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Dr. Paul D. Ashby

Dr. Paul D. Ashby

Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

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Prof. Ahmad K. Omar

Prof. Ahmad K. Omar

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, CA-94720 USA

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Prof. Thomas P. Russell

Corresponding Author

Prof. Thomas P. Russell

Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA-94720 USA

Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA-01003 USA

Advanced Institute for Materials Research (AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577 Japan

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First published: 08 April 2024
Citations: 4

Graphical Abstract

Explore the intriguing world of nanoparticle-surfactants at liquid interfaces. This study delves into how external electric fields can form and influence nanoparticle assemblies, leading to explosive emulsification behavior. It unveils a fascinating interplay between electrostatic forces and physiochemical conditions, offering a glimpse into the untapped possibilities of nanotechnology.

Abstract

Assemblies of nanoparticles at liquid interfaces hold promise as dynamic “active” systems when there are convenient methods to drive the system out of equilibrium via crowding. To this end, we show that oversaturated assemblies of charged nanoparticles can be realized and held in that state with an external electric field. Upon removal of the field, strong interparticle repulsive forces cause a high in-plane electrostatic pressure that is released in an explosive emulsification. We quantify the packing of the assembly as it is driven into the oversaturated state under an applied electric field. Physiochemical conditions substantially affect the intensity of the induced explosive emulsification, underscoring the crucial role of interparticle electrostatic repulsion.

Conflict of interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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