Journal Article

FZJ-2021-03878

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Assembly Control at a Low Péclet Number in Ultracentrifugation for Uniformly Sized Nanoparticles

Xu, X. ; Wu, B.FZJ* ; Cölfen, H. (Corresponding author) ; de With, G. (Corresponding author)

2021
Soc. Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/29018  doi:10.1021/acs.jpcc.1c00143

Abstract: The intrinsic high diffusion rate of colloids at low Péclet number results in an extremely fast crystallization process and instant formation of colloidal crystals, even at an ultracentrifugal field of extremely high intensity. By introducing a small number of clusters in sedimention, it should be possible to slow down the crystallization process, thus making the assembly order tunable in preparative ultracentrifugation experiments. Here, we used sodium dodecyl sulfate-stabilized polystyrene nanoparticles (with a size dispersity of 1.07) dispersed in a solution of high ionic strength. Sedimentation and assembly of these nanoparticles were done using preparative ultracentrifugation at various angular velocities. The sedimentation process was also analyzed in situ by analytical ultracentrifugation in real time. By creating as low as 3% of clusters into these nearly uniformly sized polystyrene nanoparticle dispersions during the sedimentation process, the superstructure order becomes easily tunable between glassy and crystalline. Theoretical calculations complemented the experiments to explain the mechanism of cluster formation in sedimentation. This work provides a novel methodology to produce superstructures with a tunable packing order for colloids at low Péclet number.

Keyword(s): Polymers, Soft Nano Particles and Proteins (1st) ; Chemistry (2nd)

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Contributing Institute(s):

1. JCNS-4 (JCNS-4)
2. Neutronenstreuung (JCNS-1)
3. JCNS-FRM-II (JCNS-FRM-II)
4. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)
2. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)

Experiment(s):

1. KWS-3: Very small angle scattering diffractometer with focusing mirror (NL3auS)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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