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000901870 1001_ $$0P:(DE-HGF)0$$aXu, Xufeng$$b0
000901870 245__ $$aAssembly Control at a Low Péclet Number in Ultracentrifugation for Uniformly Sized Nanoparticles
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000901870 520__ $$aThe intrinsic high diffusion rate of colloids at low Péclet number results in an extremely fast crystallization process and instant formation of colloidal crystals, even at an ultracentrifugal field of extremely high intensity. By introducing a small number of clusters in sedimention, it should be possible to slow down the crystallization process, thus making the assembly order tunable in preparative ultracentrifugation experiments. Here, we used sodium dodecyl sulfate-stabilized polystyrene nanoparticles (with a size dispersity of 1.07) dispersed in a solution of high ionic strength. Sedimentation and assembly of these nanoparticles were done using preparative ultracentrifugation at various angular velocities. The sedimentation process was also analyzed in situ by analytical ultracentrifugation in real time. By creating as low as 3% of clusters into these nearly uniformly sized polystyrene nanoparticle dispersions during the sedimentation process, the superstructure order becomes easily tunable between glassy and crystalline. Theoretical calculations complemented the experiments to explain the mechanism of cluster formation in sedimentation. This work provides a novel methodology to produce superstructures with a tunable packing order for colloids at low Péclet number.
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000901870 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x0
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000901870 7001_ $$0P:(DE-Juel1)151161$$aWu, Baohu$$b1$$ufzj
000901870 7001_ $$00000-0002-1148-0308$$aCölfen, Helmut$$b2$$eCorresponding author
000901870 7001_ $$00000-0002-7163-8429$$ade With, Gijsbertus$$b3$$eCorresponding author
000901870 773__ $$0PERI:(DE-600)2256522-X$$a10.1021/acs.jpcc.1c00143$$gVol. 125, no. 16, p. 8752 - 8758$$n16$$p8752 - 8758$$tThe journal of physical chemistry <Washington, DC> / C$$v125$$x1932-7455$$y2021
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