| Abstract Scope |
Particle-based crystallization relies on the synthesis and self-assembly of monodisperse, nano or micron-sized particles. Currently, inorganic nanoparticles with simple geometries (e.g. spheres, cubes) can be fabricated through bottom-up synthesis. However, it is of interest to form lower symmetry particles, in which shape can be used to control interparticle forces. For instance, particles with one or more concavities can be combined with convex structures to form complex self-assembled structures. Here, we address the challenge of fabricating colloidal particles with complex geometries by using 2-photon lithography to 3D print microscale particles of arbitrary shapes. This method has been used to print hollow cones, spheres, and cubes with dimensions of ~5 um out of a fluorescent photoresist. These 3D printed particles will be combined with traditional particles (e.g polymer or silica spheres) to form controlled networks of multi-particle assemblies, with the goal of forming millimeter-sized periodic lattices. |