Synthesis and assembly of colloidal cuboids with tunable shape biaxiality.

Synthesis and assembly of colloidal cuboids with tunable shape biaxiality.
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形状双轴可调的胶体长方体的合成与组装

DOI:
10.1038/s41467-018-06975-8
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发表时间:
2018-10-30
影响因子:
16.6
通讯作者:
Nie Z
Nie Z
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yang Y;Chen G;Thanneeru S;He J;Liu K;Nie Z

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单分散胶体粒子的设计和组装不仅推动了功能材料的发展,而且为理解分子的相行为提供了胶体模型体系。该通信描述了具有可调尺寸和形状双轴性的高度均匀的胶体立方体的克级合成,以及它们的分子介晶样组装成原始纯度的各种介相结构。该合成依赖于纳米乳液引导的硫酸铵晶体的生成,该硫酸铵晶体为随后的二氧化硅涂层提供模板。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正方形板状调整到双轴板状和棒状。我们展示了组装的立方体胶体成高纯度的介观液晶相,包括近晶A,双轴近晶A,晶体B,dissolved,和柱状相,以及建立了介相形成和胶体双轴性之间的相关性在实验中。
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.
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发表时间: 2012-01-01
影响因子: 16.6
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