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Posted: Nov 04, 2010
New photosensitive film converts light into kinetic energy, bends when irradiated
(Nanowerk News) Researchers at RIKEN have successfully developed a revolutionary new polymer film that changes
shape upon irradiation with UV and visible light. Described in Science ("Large-Area Three-Dimensional Molecular Ordering of a Polymer Brush by One-Step Processing"), the film is the largest-ever example of a material whose molecular elements are ordered in three dimensions on a macroscopic
length scale, marking a breakthrough in techniques for molecular design and processing.
Living organisms depend crucially for their growth and development on their ability to assemble
molecules into large, ordered three-dimensional structures. The same assembly processes offer an
attractive means for designing materials and devices with novel functions, yet scientists have thus far
found such processes impossible to reproduce at a macroscopic scale.
Schematic illustration of 3D molecular order in hot-pressed polymer brush film.
To overcome this impasse, the research group used a structure known as a "polymer brush" made up
of a polymethacrylate backbone with outstretched side-chains, which together form a cylindrical
shape. Azobenzene molecules, known for their propensity to deform when irradiated, were inserted
into the side chains, and a free-standing cast film, created from a solution of the polymer brushes,
was then tested for photomechanical response.
When no such response was initially detected, the researchers adopted a different approach,
sandwiching the polymer brushes between Teflon sheets to first melt them at 130 °C, then
"hot-press" them at 115 °C. The hot-pressing process, they discovered, aligned the main chains of
the brushes perpendicular to the film plane, while the side chains oriented themselves horizontally
along the stretching direction of the Teflon sheets. The resulting 3D molecular ordering enables the
film to literally bend and stretch upon alternating irradiation by UV and visible light.
In converting light energy directly into a mechanical force, this remarkable photoresponsive bending
motion breaks new ground in the study of functional materials, suggesting applications in the design
of muscle-like biomorphic devices. As a technique, the combination of polymer brushes and
hot-pressing vastly expands the scale at which such materials can be manufactured, promising to
bring advances from the world of molecular processing to the macroscopic level of our daily lives.
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