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Related Experiment Video

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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Transition in Dynamics as Nanoparticles Jam at the Liquid/Liquid Interface.

Mengmeng Cui¹, Caroline Miesch¹, Irem Kosif¹

¹Polymer Science and Engineering Department, University of Massachusetts Amherst , 120 Governors Drive, Amherst, Massachusetts 01003, United States.

|October 20, 2017

Summary

Nanoparticles at liquid interfaces transition from liquid-like to jammed states as their density increases. This jamming behavior, studied in emulsions, shows intermittent dynamics indicating a significant change in nanoparticle assembly behavior.

Keywords:

Dynamics X-ray photon correlation spectroscopy interfacial jamming nanoparticle

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Area of Science:

Soft Matter Physics
Colloid Science
Materials Science

Background:

Nanoparticles (NPs) at liquid-liquid interfaces form dynamic, liquid-like assemblies.
Increasing NP density leads to jamming, altering interfacial dynamics.
Understanding NP jamming is crucial for controlling interfacial properties.

Purpose of the Study:

To investigate the dynamics of nanoparticle assemblies at the liquid-liquid interface.
To characterize the transition from liquid-like to jammed states.
To utilize water-in-toluene emulsions as a model system for studying NP interfacial dynamics.

Main Methods:

X-ray photon correlation spectroscopy (XPCS) was employed to study NP dynamics.
Water-in-toluene emulsions stabilized by ligand-capped CdSe-ZnS NPs were used.
The study analyzed diffusive and intermittent dynamics indicative of jamming.

Main Results:

Diffusive motion was observed in disordered NP assemblies at low densities.
A transition to intermittent, confined dynamics was observed as NP density increased.
This transition signifies the onset of jamming in the NP interfacial assemblies.

Conclusions:

Nanoparticle assemblies at liquid interfaces exhibit jamming behavior.
The transition from diffusive to confined dynamics is a hallmark of NP jamming.
Emulsion systems provide an effective platform for studying interfacial NP dynamics.