3 research outputs found
Light-Triggered Inflation of Microdroplets
Driven systems composed
largely of droplets and fuel
make up a
significant portion of microbiological function. At the micrometer
scale, fully synthetic systems that perform an array of tasks within
a uniform bulk are much more rare. In this work, we introduce an innovative
design for solid-in-oil composite microdroplets. These microdroplets
are engineered to nucleate an internal phase, undergo inflation, and
eventually burst, all powered by a steady and uniform energy input.
We show that by altering the background input, volumetric change and
burst time can be tuned. When the inflated droplets release the inner
contents, colloidal particles are shown to transiently attract to
the release point. Lastly, we show that the system has the ability
to perform multiple inflation–burst cycles. We anticipate that
our conceptual design of internally powered microdroplets will catalyze
further research into autonomous systems capable of intricate communication
as well as inspire the development of advanced, responsive materials
Light-Triggered Inflation of Microdroplets
Driven systems composed
largely of droplets and fuel
make up a
significant portion of microbiological function. At the micrometer
scale, fully synthetic systems that perform an array of tasks within
a uniform bulk are much more rare. In this work, we introduce an innovative
design for solid-in-oil composite microdroplets. These microdroplets
are engineered to nucleate an internal phase, undergo inflation, and
eventually burst, all powered by a steady and uniform energy input.
We show that by altering the background input, volumetric change and
burst time can be tuned. When the inflated droplets release the inner
contents, colloidal particles are shown to transiently attract to
the release point. Lastly, we show that the system has the ability
to perform multiple inflation–burst cycles. We anticipate that
our conceptual design of internally powered microdroplets will catalyze
further research into autonomous systems capable of intricate communication
as well as inspire the development of advanced, responsive materials
Reconfiguring Nanocomposite Liquid Crystal Polymer Films with Visible Light
Patterns of white light are projected
on liquid crystal (LC) polymer
films containing gold nanospheres (NS) or nanorods (NR) to induce
out-of-plane buckling through a photothermal effect. Straightforward
synthetic techniques are used to provide well-dispersed nanocomposite
films, with NRs exhibiting self-alignment with the LC director. Using
a combination of prepatterned director orientation and spatiotemporal
variations in light intensity, these nanocomposite films can be reversibly
configured into different 3D states. Fine control over shape is demonstrated
through variations in size, shape, and intensity of the illuminated
region. Switching time scales are found to be of order a few seconds
or below, likely reflecting the intrinsic relaxation time of the LC
materials