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Journal Article

Colloidal tornadoes in a vial under gravitational sedimentation

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Zhang,  Jianrui
Bernhard Schmidt, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Antonietti,  Markus
Markus Antonietti, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Kumru,  Baris
Baris Kumru, Kolloidchemie, Max Planck Institute of Colloids and Interfaces, Max Planck Society;

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Citation

Zhang, J., Antonietti, M., & Kumru, B. (2021). Colloidal tornadoes in a vial under gravitational sedimentation. Journal of Chemical Education, 98(4), 1347-1351. doi:10.1021/acs.jchemed.0c01507.


Cite as: http://hdl.handle.net/21.11116/0000-0008-1CB2-0
Abstract
Collective motion in living matter is highly intriguing but can also be observed in charged colloidal systems. Collective motion observed in colloidal systems requires extensive material synthesis, external stimuli, and advanced characterization methods that might be highly costly to be employed for teaching. Besides that, colloidal systems can inherently possess dynamic movements. Generally, colloidal sedimentation is pictured as a linear movement, but under certain conditions autonomously activated sedimentation can be attained. In this demonstration, a simple formation of colloidal tornadoes will be explored by gravitational force as the sole stimulus. This demonstration is ideal for the general public for colloid chemistry learning, and these findings can be coupled to colloidal stability lectures.