Photonic Janus Colloids with Angle-dependent Structural Color
발표자
()
초록
내용
Photonic Janus colloids, composed of an oil droplet fused to a nanostructured polymer cone, are fabricated through the phase separation of silicone oil and polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) from oil-in-water emulsions. Within the interface-engineered emulsion, the self-assembly of high molecular weight PS-b-P2VP gives rise to the formation of highly anisotropic conical geometry (i.e., aspect ratio > 6) with defect-free lamellar structures aligned along the long axis of the cone. The inherent density difference and unique geometric characteristics of the components results in the BCP cone to naturally orient itself towards the bottom, ensuring the stable dispersion of the colloids in water without any sedimentation. We demonstrate the angle-dependent structural colors across the entire visible spectrum, which suggest exceptional sensitivity in detecting water vibration or flow.