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The mixing of polymers and nanoparticles is opening pathways for engineering flexible composites          
that exhibit advantageous electrical, optical, or mechanical properties. Recent advances reveal          
routes to exploit both enthalpic and entropic interactions so as to direct the spatial distribution          
of nanoparticles and thereby control the macroscopic performance of the material. For example,          
by tailoring the particle coating and size, researchers have created self-healing materials for          
improved sustainability and self-corralling rods for photovoltaic applications. A challenge for          
future studies is to create hierarchically structured composites in which each sublayer contributes a          
distinct function to yield a mechanically integrated, multifunctional material.

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