A team of material scientists, chemical engineers and physicists¹ from the University of Pennsylvania has made another advance in their effort to use liquid crystals as a medium for assembling structures. In their earlier studies, the team produced patterns of "defects," useful disruptions in the repeating patterns found in liquid crystals, in nanoscale grids³ and rings. The new study adds a more complex pattern out of an even simpler template（模板）: a three-dimensional array in the shape of a flower.

 

And because the petals⁴ of this "flower" are made of transparent⁵ liquid crystal and radiate（辐射，流露） out in a circle from a central point, the ensemble⁶ resembles a compound eye and can thus be used as a lens.

 

The team consists of Randall Kamien, professor in the School of Arts and Sciences' Department of Physics and Astronomy; Kathleen Stebe, the School of Engineering and Applied⁷ Science's deputy dean for research and professor in Chemical and Biomolecular Engineering and Shu Yang, professor in Engineering's departments of Materials Science and Engineering and Chemical and Biomolecular Engineering. Members of their labs also contributed to the new study, including lead author Daniel Beller, Mohamed Gharbi and Apiradee Honglawan.

 

Their work was published in Physical Review X.

 

The researchers' ongoing⁸ work with liquid crystals is an example of a growing field of nanotechnology known as "directed assembly," in which scientists and engineers aim to manufacture structures on the smallest scales without having to individually manipulate each component⁹. Rather, they set out precisely¹⁰ defined starting conditions and let the physics and chemistry that govern those components¹¹ do the rest.

 

The starting conditions in the researchers previous experiments were templates consisting of tiny posts. In one of their studies, they showed that changing the size, shape or spacing of these posts would result in corresponding changes in the patterns of defects on the surface of the liquid crystal resting on top of them. In another experiment, they showed they could make a "hula hoop¹²" of defects around individual posts, which would then act as a second template for a ring of defects at the surface.

 

In their latest work, the researchers used a much simpler cue.

 

"Before we were growing these liquid crystals on something like a trellis（格子，框架）, a template with precisely ordered features," Kamien said. "Here, we're just planting a seed."

 

The seed, in this case, were silica beads¹⁴ -- essentially¹⁵, polished grains of sand. Planted at the top of a pool of liquid crystal flower-like patterns of defects grow around each bead¹³.

 

The key difference between the template in this experiment and ones in the research team's earlier work was the shape of the interface¹⁶ between the template and the liquid crystal.

 

In their experiment that generated grid² patterns of defects, those patterns stemmed from cues generated by the templates' microposts. Domains¹⁷ of elastic¹⁸ energy originated on the flat tops and edges of these posts and travelled up the liquid crystal's layers, culminating in defects. Using a bead instead of a post, as the researchers did in their latest experiment, makes it so that the interface is no longer flat.

 

"Not only is the interface at an angle, it's an angle that keeps changing," Kamien said. "The way the liquid crystal responds to that is that it makes these petal-like shapes at smaller and smaller sizes, trying to match the angle of the bead until everything is flat."

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