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Related Experiment Video

Updated: Jul 7, 2026

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

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Published on: July 19, 2016

Surface-induced first-order transition in athermal polymer-nanoparticle blends.

E S McGarrity¹, A L Frischknecht, L J D Frink

¹Department of Chemical Engineering & Materials Science, Michigan State University, East Lansing, Michigan, 48824-1226, USA.

Physical Review Letters

|February 1, 2008

Summary

Nanoparticles can form a surface monolayer by expelling polymers from a substrate. This phase transition in polymer-nanoparticle blends depends on component size and density, explaining the entropic-push effect.

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

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Published on: May 15, 2017

Area of Science:

Soft matter physics
Materials science
Physical chemistry

Background:

Athermal polymer-nanoparticle blends exhibit complex phase behavior, particularly near interfaces.
Understanding interfacial phenomena is crucial for designing advanced materials and predicting blend properties.

Purpose of the Study:

To investigate the phase behavior of athermal polymer-nanoparticle blends adjacent to a substrate.
To elucidate the fundamental mechanisms driving nanoparticle organization at interfaces.

Main Methods:

Application of a fluids density functional theory (Tripathi and Chapman).
Modeling the blend as a mixture of hard spheres (nanoparticles) and freely jointed hard chains (polymers).
Simulation of the system near a hard wall.

Main Results:

Observed a first-order phase transition where nanoparticles form a surface monolayer.
Nanoparticles expel polymers from the substrate during this transition.
The transition density is influenced by polymer length and bulk density.

Conclusions:

The study explains the "entropic-push" phenomenon observed in experiments.
Both packing entropy (due to size asymmetry) and polymer configurational entropy drive the observed phase behavior.
The findings provide insights into the interfacial self-assembly of nanoparticle-polymer systems.