Synthesis and assembly of colloidal cuboids with tunable shape biaxiality.,Nature Communications

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Synthesis and assembly of colloidal cuboids with tunable shape biaxiality.
Nature Communications ( IF 14.7 ) Pub Date : 2018-10-30 , DOI: 10.1038/s41467-018-06975-8
Yang Yang _{1,

2} , Guangdong Chen ₁ , Srinivas Thanneeru ₃ , Jie He ₃ , Kun Liu ₂ , Zhihong Nie ₁

Affiliation

The design and assembly of monodisperse colloidal particles not only advances the development of functional materials, but also provides colloidal model systems for understanding phase behaviors of molecules. This communication describes the gram-scale synthesis of highly uniform colloidal cuboids with tunable dimension and shape biaxiality and their molecular mesogen-like assembly into various mesophasic structures in pristine purity. The synthesis relies on the nanoemulsion-guided generation of ammonium sulfate crystals that template the subsequent silica coating. The shape of the cuboidal particles can be tuned from square platelike, to biaxial boardlike, and to rodlike by independently controlling the length, width and thickness of the particles. We demonstrated the assembly of the cuboidal colloids into highly pure mesoscopic liquid crystal phases, including smectic A, biaxial smectic A, crystal B, discotic, and columnar phases, as well as established a correlation between mesophasic formation and colloidal biaxiality in experiments.

中文翻译：

具有可调形状双轴性的胶体长方体的合成和组装。

单分散胶体颗粒的设计和组装不仅促进了功能材料的发展，而且为理解分子的相行为提供了胶体模型系统。该通讯描述了具有可调尺寸和形状双轴性的高度均匀的胶体长方体的克级合成，以及它们以原始纯度的类介晶组装成各种中间相结构。该合成依赖于纳米乳液引导的硫酸铵晶体的生成，该晶体为随后的二氧化硅涂层提供了模板。通过独立控制颗粒的长度、宽度和厚度，可以将立方体颗粒的形状从方形板状调整为双轴板状和棒状。我们展示了立方体胶体组装成高纯介观液晶相，包括近晶A、双轴近晶A、晶体B、盘状和柱状相，并在实验中建立了中间相形成和胶体双轴性之间的相关性。

更新日期：2018-10-31

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