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Updated: Mar 17, 2026

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 9, 2014

Forming Nanoparticle Monolayers at Liquid-Air Interfaces by Using Miscible Liquids.

Datong Zhang¹, Jiayang Hu¹, Kathleen M Kennedy¹

¹Department of Applied Physics and Applied Mathematics, Columbia University , New York, New York 10027, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 27, 2016

Summary

This summary is machine-generated.

Researchers developed a new method for creating nanoparticle monolayers using miscible solvents, enabling self-assembly at liquid-air interfaces. This approach expands the possibilities for nanoparticle assembly and material fabrication.

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Nanoparticle monolayers (MLs) are typically formed using immiscible solvent pairs.
This method involves drop-casting a nanoparticle dispersion onto a second solvent, followed by evaporation and transfer.

Purpose of the Study:

To investigate the use of miscible solvent pairs for self-assembling nanoparticle monolayers.
To demonstrate a novel approach for forming ordered nanoparticle structures.

Main Methods:

Drop-casting iron oxide nanoparticle dispersion in toluene onto a dimethyl sulfoxide (DMSO) liquid substrate.
Utilizing the liquid-air interface for nanoparticle self-assembly.
Comparing results with immiscible solvent pairs (toluene/diethylene glycol).

Main Results:

Close-packed, hexagonally ordered nanoparticle monolayers self-assembled at the liquid-air interface using miscible solvents.
Nanoparticles remained stable at the DMSO surface despite solvent mixing.
Excess nanoparticles coagulated and precipitated, limiting surface coverage to approximately one monolayer.
Monolayer domains nucleated independently, differing from growth at the receding edge in immiscible systems.

Conclusions:

The use of miscible solvent pairs can be relaxed from the universal requirement of immiscible pairs for nanoparticle monolayer formation.
This new method broadens the range of nanoparticles that can be used to form monolayers.
The self-assembly at liquid-air interfaces offers a new pathway for creating ordered nanoparticle structures.