3 years ago

Thermomechanical Response of Self-Assembled Nanoparticle Membranes

Thermomechanical Response of Self-Assembled Nanoparticle Membranes
Yifan Wang, Sean P. McBride, Heinrich M. Jaeger, Xiao-Min Lin, Subramanian K. R. S. Sankaranarayanan, Henry Chan, Badri Narayanan
Monolayers composed of colloidal nanoparticles, with a thickness of less than 10 nm, have remarkable mechanical moduli and can suspend over micrometer-sized holes to form free-standing membranes. In this paper, we discuss experiments and coarse-grained molecular dynamics simulations characterizing the thermomechanical properties of these self-assembled nanoparticle membranes. These membranes remain strong and resilient up to temperatures much higher than previous simulation predictions and exhibit an unexpected hysteretic behavior during the first heating–cooling cycle. We show this hysteretic behavior can be explained by an asymmetric ligand configuration from the self-assembly process and can be controlled by changing the ligand coverage or cross-linking the ligand molecules. Finally, we show the screening effect of water molecules on the ligand interactions can strongly affect the moduli and thermomechanical behavior.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b02676

DOI: 10.1021/acsnano.7b02676

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