Janus cylinders are one-dimensional colloids that have two faces with different compositions and functionalities, and are useful as building blocks for advanced functional materials. Such anisotropic objects are difficult to prepare with nanometric dimensions. Here we describe a robust and versatile strategy to form micrometer long Janus nanorods with diameters in the 10-nanometer range, by self-assembly in water of end-functionalized polymers. The Janus topology is not a result of the phase segregation of incompatible polymer arms, but is driven by the interactions between unsymmetrical and complementary hydrogen bonded stickers. Therefore, even compatible polymers can be used to form these Janus objects. In fact, any polymers should qualify, as long as they do not prevent co-assembly of the stickers. To illustrate their applicative potential, we show that these Janus nanorods can efficiently stabilize oil-in-water emulsions.

Janus 圆柱体是一维胶体，具有两个不同成分和功能的面，可用作先进功能材料的构建块。这种各向异性物体很难制备成纳米尺寸。在这里，我们描述了一种稳健且通用的策略，通过末端官能化聚合物在水中自组装来形成微米长、直径在 10 纳米范围内的 Janus 纳米棒。 Janus拓扑不是不相容聚合物臂相分离的结果，而是由不对称和互补氢键贴纸之间的相互作用驱动的。因此，甚至可以使用兼容的聚合物来形成这些 Janus 物体。事实上，任何聚合物都应该符合资格，只要它们不妨碍贴纸的共同组装。为了说明它们的应用潜力，我们证明这些 Janus 纳米棒可以有效稳定水包油乳液。