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Quantitative 3D determination of self-assembled structures on nanoparticles using small angle neutron scattering.


ABSTRACT: The ligand shell (LS) determines a number of nanoparticles' properties. Nanoparticles' cores can be accurately characterized; yet the structure of the LS, when composed of mixture of molecules, can be described only qualitatively (e.g., patchy, Janus, and random). Here we show that quantitative description of the LS' morphology of monodisperse nanoparticles can be obtained using small-angle neutron scattering (SANS), measured at multiple contrasts, achieved by either ligand or solvent deuteration. Three-dimensional models of the nanoparticles' core and LS are generated using an ab initio reconstruction method. Characteristic length scales extracted from the models are compared with simulations. We also characterize the evolution of the LS upon thermal annealing, and investigate the LS morphology of mixed-ligand copper and silver nanoparticles as well as gold nanoparticles coated with ternary mixtures. Our results suggest that SANS combined with multiphase modeling is a versatile approach for the characterization of nanoparticles' LS.

SUBMITTER: Luo Z 

PROVIDER: S-EPMC5890256 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature

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Quantitative 3D determination of self-assembled structures on nanoparticles using small angle neutron scattering.

Luo Zhi Z   Marson Domenico D   Ong Quy K QK   Loiudice Anna A   Kohlbrecher Joachim J   Radulescu Aurel A   Krause-Heuer Anwen A   Darwish Tamim T   Balog Sandor S   Buonsanti Raffaella R   Svergun Dmitri I DI   Posocco Paola P   Stellacci Francesco F  

Nature communications 20180409 1


The ligand shell (LS) determines a number of nanoparticles' properties. Nanoparticles' cores can be accurately characterized; yet the structure of the LS, when composed of mixture of molecules, can be described only qualitatively (e.g., patchy, Janus, and random). Here we show that quantitative description of the LS' morphology of monodisperse nanoparticles can be obtained using small-angle neutron scattering (SANS), measured at multiple contrasts, achieved by either ligand or solvent deuteratio  ...[more]

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