Modifying the environment around particles (e.g., introducing a secondary phase or external field) can affect the way they interact and assemble, thereby giving control over the physical properties of a dynamic system. Here, graphene oxide (GO) photonic liquids that respond to a magnetic field are demonstrated for the first time. Magnetic nanoparticles are used to provide a continuous magnetizable liquid environment around the GO liquid crystalline domains. In response to a magnetic field, the alignment of magnetic nanoparticles, coupled with the diamagnetic property of GO nanosheets, drives the reorientation and alignment of the nanosheets, enabling switchable photonic properties using a permanent magnet. This phenomenon is anticipated to be extendable to other relevant photonic systems of shape-anisotropic nanoparticles and may open up opportunities for developing GO-based optical materials and devices.

中文翻译：

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磁场响应氧化石墨烯光子液体

改变粒子周围的环境（例如，引入第二相或外部场）可以影响它们相互作用和组装的方式，从而控制动态系统的物理性质。在这里，首次展示了对磁场做出响应的氧化石墨烯（GO）光子液体。磁性纳米粒子用于在 ​​GO 液晶域周围提供连续的可磁化液体环境。响应磁场，磁性纳米颗粒的排列与 GO 纳米片的抗磁特性相结合，驱动纳米片的重新定向和排列，从而利用永磁体实现可切换的光子特性。这种现象预计将扩展到其他相关的形状各向异性纳米粒子的光子系统，并可能为开发基于 GO 的光学材料和器件开辟机会。