Colloidal Stability of Apolar Nanoparticles: Role of Ligand Length
Debora Monego, Thomas Kister, Nicholas Kirkwood, Paul Mulvaney, Asaph Widmer-Cooper, Tobias Kraus
LANGMUIR | AMER CHEMICAL SOC | Published : 2018
Inorganic nanoparticle cores are often coated with organic ligands to render them dispersible in apolar solvents. However, the effect of the ligand shell on the colloidal stability of the overall hybrid particle is not fully understood. In particular, it is not known how the length of an apolar alkyl ligand chain affects the stability of a nanoparticle dispersion against agglomeration. Here, small-angle X-ray scattering and molecular dynamics simulations have been used to study the interactions between gold nanoparticles and between cadmium selenide nanoparticles passivated by alkanethiol ligands with 12-18 carbons in the solvent decane. We find that increasing the ligand length increases co..View full abstract
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Awarded by ARC Centre of Excellence in Exciton Science
Awarded by Australian Research Council
P.M., N.K., D.M., and A.W. were supported by the ARC Centre of Excellence in Exciton Science (CE170100026). A.W. thanks the Australian Research Council for a Future Fellowship (FT140101061), and D.M. thanks the University of Sydney Nano Institute for a Postgraduate Top-Up Scholarship. Computational resources were generously provided by the University of Sydney HPC service, the National Computational Infrastructure National Facility (NCI -NF) Flagship program, and the Pawsey Supercomputer Centre Energy and Resources Merit Allocation Scheme. T.K. and T.K. thank the DFG Deutsche Forschungsgemeinschaft for funding and E. Arzt for his continuing support of this project. P.M. and T.K. also thank the DAAD for travel support.