Ministry of Education Key Laboratory of Advanced Civil Engineering Material, School of Materials Science and Engineering and Institute for Advanced Study, Tongji University , Shanghai, China 201804.
Langmuir. 2017 Apr 11;33(14):3444-3449. doi: 10.1021/acs.langmuir.7b00249. Epub 2017 Mar 29.
Geometrically structured polymer nanocolloids, including Janus nanocolloids, have been widely investigated for their unique properties, which are derived from their anisotropy. Controlled surface decoration with inorganic nanoparticles could induce another level of functionality into structured nanocolloids that could enable applications in fields ranging from rewriteable electronics to biphasic catalysis. Here, we demonstrate flash nanoprecipitation (FNP) as a one-step, scalable process platform for manufacturing hybrid polymer-inorganic nanocolloids in which one phase is selectively decorated with a metal nanocatalyst by tuning the molecular interactions between the feed ingredients during the process. For instance, by modifying the polymer end-group functionality, we document the ability to tune the location of the metal nanocatalyst, including placement at the nanocolloid circumference. Moreover, the addition of molecular additives is shown to transform the Janus nanocolloid structure from spherical to dumbbell or snowman while maintaining the ability to control the nanocatalyst location. In considering the flexibility and continuous nature of the FNP process, it offers an industrial-scale platform for the manufacturing of nanomaterials that are anticipated to impact many technologies.
具有几何结构的聚合物纳米胶体，包括各向异性的 Janus 纳米胶体，因其独特的性质而得到了广泛的研究。通过控制无机纳米粒子在纳米胶体表面的修饰，可以赋予结构化纳米胶体另一层次的功能，从而使其在从可重写电子学到双相催化等领域得到应用。在这里，我们展示了闪蒸纳米沉淀（FNP）作为一种一步法、可扩展的工艺平台，用于制造杂化聚合物-无机纳米胶体，其中通过在过程中调节进料成分之间的分子相互作用，可以选择性地用金属纳米催化剂修饰一相。例如，通过修饰聚合物端基官能团，我们证明了可以调节金属纳米催化剂的位置，包括在纳米胶体圆周上的位置。此外，添加分子添加剂可以将 Janus 纳米胶体结构从球形转变为哑铃形或雪人形，同时保持控制纳米催化剂位置的能力。考虑到 FNP 工艺的灵活性和连续性，它为制造预计将影响许多技术的纳米材料提供了一个工业规模的平台。
