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Issue 17, 2017
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The role of ligands in the mechanical properties of Langmuir nanoparticle films

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Abstract

Langmuir monolayers of ligand-capped inorganic nanoparticles exhibit rich morphologies under lateral compression such as wrinkling, folding, and multilayer nucleation. We demonstrate that the ligands play a crucial role in the mechanical properties of nanoparticle films by probing the morphology and anisotropic stress response during lateral compression of films with systematically varied ligand concentrations. Increasing the ligand concentration of the films past a threshold value inhibits monolayer wrinkling and folding in favor of multilayer formation, and sharply reduces the compressive and shear moduli. We attribute these drastic mechanical effects to modifications to the ligand interactions between adjacent particles as well as to two-dimensional crystalline structure changes occurring on the scale of tens of particles, as determined by transmission electron microscopy.

Graphical abstract: The role of ligands in the mechanical properties of Langmuir nanoparticle films

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Publication details

The article was received on 15 Feb 2017, accepted on 01 Apr 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7SM00319F
Citation: Soft Matter, 2017,13, 3125-3133
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    The role of ligands in the mechanical properties of Langmuir nanoparticle films

    S. D. Griesemer, S. S. You, P. Kanjanaboos, M. Calabro, H. M. Jaeger, S. A. Rice and B. Lin, Soft Matter, 2017, 13, 3125
    DOI: 10.1039/C7SM00319F

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