INS4-0720
Dynamic Nanostructures through Assembly of Nanoparticles and Functional Polymers
Topic
S4. Colloids, Interfaces, and Molecular Assemblies for Functional Soft Materials
When and Where
Oct 1, 2026
10:20 - 10:45
Room 106
Session Chairs
Jae Bem YOU
Presenter(s)
So-Jung Park (Ewha Womans University)
Co-Author(s)
Abstract
The assembly of nanoscale building blocks into complex nanostructures with controlled structural anisotropy offers intriguing opportunities for active materials. Here, we present strategies to create such nanostructures capable of dynamic structural and functional transformations. First, we developed magnetically controllable plasmonic nanoparticles composed of anisotropic gold cores encapsulated within superparamagnetic iron oxide shells, enabling rapid and reversible particle alignment under external magnetic fields. Linearly aligned assemblies exhibit strong plasmon-mediated birefringence with polarization-dependent transmission colors, while helical magnetic fields induce chiral superstructures that display pronounced circular dichroism, demonstrating real-time magnetic modulation of light–matter interactions. Second, we combine bottom-up DNA-directed self-assembly with top-down photothermal patterning to fabricate free-standing nanoparticle films with both vertical and lateral heterogeneity. The resulting DNA-linked, photopatterned films exhibit complex morphing behaviors governed by both the spatial patterns inscribed in the film and the molecular information encoded in DNA. Furthermore, incorporating superparamagnetic nanoparticles enables remote magnetic control over motion, underscoring the versatility of this approach for dynamic, active materials.
