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“Long-range transport and directed assembly of charged colloids under aperiodic electrodiffusiophoresis” published in Soft Matter, selected as VINSE Spotlight Publication

Posted by on Tuesday, September 13, 2022 in News, Spotlight Publications.

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About the author: Kun Wang is currently a PhD candidate under the direction of Dr. Carlos Silvera Batista. Kun’s research focuses on understanding the long-range kinetics and assembly of colloidal particles under the coupling of electric field and concentration gradient. In the featured publication, Kun and co-authors show how faradaic processes and its induced concentration gradient under ac fields can be used advantageously to control long-range transport, and assembly of charged colloids. At low frequencies, a highly non-linear pH profile is produced near the electrode surface. As a result, negatively charged particles migrate towards the point of highest pH showing a significant focusing tens of microns away from both electrodes. Furthermore, the focused particles show a disorder–order transition forming hexagonal crystals. The insights presented in this article have implications for the directed assembly and fundamental aspects of colloidal electrokinetics.


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