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Related Experiment Video

Updated: May 13, 2026

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

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Published on: March 13, 2016

Structured self-assembly of like-charged bridging nanoparticles driven by varying separation between two interfaces.

Matthew J K Ow¹, Edwin K L Yeow¹

¹School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.

Journal of Colloid and Interface Science

|May 11, 2026

Summary

Like-charged silica nanoparticles self-assemble into rings and star-shaped clusters at liquid interfaces. The confined space between interfaces controls nanoparticle interactions and assembly, enabling tunable structures.

Keywords:

Bridging nanoparticles Emulsion Like-charged nanoparticles Liquid-liquid interface Pairwise interaction Structured self-assembly

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Last Updated: May 13, 2026

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Published on: March 13, 2016

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Published on: May 9, 2014

Area of Science:

Colloid and Surface Science
Nanoparticle Self-Assembly
Interfacial Phenomena

Background:

Like-charged silica nanoparticles exhibit complex behavior at liquid-liquid interfaces.
Understanding nanoparticle self-assembly is crucial for developing novel materials and devices.

Purpose of the Study:

To investigate the formation of rings and star-shaped clusters of silica nanoparticles at aqueous-organic interfaces.
To explore the role of confined interfacial space in templating nanoparticle self-assembly.
To elucidate the interplay of interfacial adsorption, capillary, and electrostatic forces.

Main Methods:

Real-time observation of nanoparticle assembly using wide-field fluorescence microscopy.
Development of a theoretical model incorporating interfacial adsorption, capillary attraction, and electrostatic repulsion.
Comparison of experimental and simulation data for inter-nanoparticle separation (δ) and confined space thickness (d).

Main Results:

Silica nanoparticles form tightly packed rings and star-shaped clusters at the liquid-liquid interface.
Young's law and dielectric screening contribute to ring formation by suppressing repulsive forces.
Interfacial curvature influences nanoparticle repulsion and separation in cluster arms.
The thickness of the confined space (d) allows for tunable control over nanoparticle interactions.

Conclusions:

The confined space between liquid-liquid interfaces acts as a template for structured nanoparticle self-assembly.
Interfacial forces, including capillary and electrostatic interactions, govern the formation of specific nanoparticle architectures.
Controlled manipulation of interfacial thickness offers a pathway for tuning nanoparticle interactions and assembly.