Publication: The role of ligands in the mechanical properties of Langmuir nanoparticle films
Issued Date
2017-01-01
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ISSN
17446848
1744683X
1744683X
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2-s2.0-85021685904
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Mahidol University
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SCOPUS
Bibliographic Citation
Soft Matter. Vol.13, No.17 (2017), 3125-3133
Suggested Citation
Sean D. Griesemer, Siheng Sean You, Pongsakorn Kanjanaboos, Melanie Calabro, Heinrich M. Jaeger, Stuart A. Rice, Binhua Lin The role of ligands in the mechanical properties of Langmuir nanoparticle films. Soft Matter. Vol.13, No.17 (2017), 3125-3133. doi:10.1039/c7sm00319f Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/42278
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Title
The role of ligands in the mechanical properties of Langmuir nanoparticle films
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Abstract
© The Royal Society of Chemistry 2017. 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.