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Concept of 3D printable HSNPs. (a) Conceptual schematic illustrating printed HSNPs on a solar device for its passive cooling. (b) Photograph depicting printed lines (a width of approximately 330 μm) composed of HSNPs on a silicone substrate. Scale bar: 1 cm (c) photographs depicting 3D printed lines composed of HSNPs on sloped objects with inclination angles of 45° (left) and 60° (right). Scale bar: 1.5 cm (d) 3D-rendered images of the sloped objects.
