Colloidal photonic crystals (CPCs) with a highly ordered crystal structure have attracted great attention in displays, colorimetric sensors and solar energy utilization fields. However, the easily cracking microstructure, inferior assembly efficiency and low refractive index contrast result in poor structural colors. Herein, we develop core–shell poly(styrene-acrylic)@polypyrrole (P(St-AA)@PPy) colloidal nanoparticles by the in situ chemical coupling reaction via droplet microfluidic technology. By membrane separation-assisted assembly (MSAA) and electrostatic spraying strategies, the P(St-AA)@PPy colloidal nanoparticles are assembled into the CPC film, which presents high assembly efficiency and saturated angle-independent structural colors, due to the light-absorbing PPy shell and hydrogen-bond interaction between nanoparticles. Benefitting from these outstanding performances, the P(St-AA)@PPy film shows excellent photothermal properties, which can realize a solar vaporization rate of 1.5825 kg m⁻² h⁻¹, corresponding to a light-to-vapor efficiency of 94.20%, under 1.0 sun solar irradiance conditions. Our findings open a path for the design of functional CPCs and new-generation photothermal applications.

中文翻译：

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用于太阳能蒸发的装甲胶体光子晶体

具有高度有序晶体结构的胶体光子晶体（CPCs）在显示器、比色传感器和太阳能利用领域引起了极大的关注。然而，易开裂的微观结构、较差的组装效率和低折射率对比度导致结构颜色不佳。在此，我们通过开发核-壳聚（苯乙烯-丙烯酸）@polypyrrole（P（ST-AA）@PPy）胶体纳米粒子原位化学偶联反应通过液滴微流控技术。通过膜分离辅助组装 (MSAA) 和静电喷涂策略，P(St-AA)@PPy 胶体纳米粒子组装成 CPC 膜，由于光-吸收PPy壳和纳米颗粒之间的氢键相互作用。得益于这些出色的性能，P(St-AA)@PPy薄膜表现出优异的光热性能，可实现1.5825 kg m ^-2 h ^-1的太阳能蒸发率，对应的光气效率为94.20% , 在 1.0 太阳太阳辐照度条件下。我们的发现为功能性 CPC 的设计和新一代光热应用开辟了道路。