Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session AAA03: V: Self-Assembly and Composite Materials
12:30 PM–2:30 PM,
Wednesday, March 22, 2023
Room: Virtual Room 3
Sponsoring
Unit:
DSOFT
Chair: Debashish Mukherji, University of British Columbia
Abstract: AAA03.00010 : Colloidal molecules with directionality and controlled flexibility*
2:18 PM–2:30 PM
Presenter:
Daniela J Kraft
(Leiden University)
Author:
Daniela J Kraft
(Leiden University)
Colloidal molecules are ideal model systems for mimicking real molecules as well as versatile building blocks for the bottom-up self-assembly of flexible and smart materials. Current colloidal molecules do not feature the typically restricted motion range and bond directionality of real molecules.
In this work, we create flexible colloidal molecules with an in situ controllable motion range by assembling spherical particles onto cubes functionalized with complementary surface-mobile DNA. We assemble colloidal molecules with different coordination number of spheres by varying the size ratio and find that they feature a constrained range of motion above a critical size ratio. Using simulations/calculations, we show that particle shape together with the multivalent bond creates an effective free energy landscape for the motion of the sphere on the cube surface. A change in temperature allows switching between full and constrained flexibility of these colloidal molecules in situ. These flexible colloidal molecules with temperature switchable motion range can be used to investigate the effect of directional, yet flexible bonds in studying their self-assembly and phase behavior, and may be employed as constructional units in microrobotics and novel smart materials.
*ERC Starting Grant number 758383, RECONFMATERC Advanced Grant number ERC-2019-ADV-H2020 884902, SoftML
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