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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Out-of-Equilibrium Assembly of Colloidal Particles at Air/Water Interface Tuned by Their Chemical Modification
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Out-of-Equilibrium Assembly of Colloidal Particles at Air/Water Interface Tuned by Their Chemical Modification

机译：胶体粒子在空气/水界面处的非平衡组装，通过化学改性对其进行调节

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Assemblies of monolayers made of colloidal silica particles trapped at the air/water interface are prepared to have an increasing capillary interaction. Fine-tuning of the strength of interaction and its orientational specificity is achieved through isotropic or anisotropic colloid surface chemical modification or by adjusting the subphase surface tension. The capillary attraction between colloids is strong and specific enough to drive the particle organization out of equilibrium toward kinetically arrested assemblies. For isotropic particles, the square order competes with the hexagonal one at low area densities, which leads to their mutual frustration resulting in a polycrystalline solid at high densities: Anisotropic Janus particles attract so strongly and with such an orientational specificity that the resulting assemblies are the most dynamically arrested, although the crystal gains are highly ordered on the short length scale. We show that the particle anisotropic surface modification does not always result in a, good long-range ordering at interfaces, although it opens up new possibilities of structure control.
机译：由捕获在空气/水界面处的胶态二氧化硅颗粒制成的单层组件的制备使其毛细管相互作用增加。通过各向同性或各向异性胶体表面化学修饰或通过调节亚相表面张力，可以实现相互作用强度及其定向特异性的微调。胶体之间的毛细血管吸引作用强且特异性足以驱使粒子组织失去平衡，朝着动力学上受阻的组件运动。对于各向同性颗粒，低密度下的方形序与六方晶竞争，这导致它们相互受挫，从而在高密度下产生多晶固体：各向异性的Janus颗粒是如此强烈地吸引并且具有这样的定向特异性，使得所得组装体成为尽管晶体增益在短长度范围内高度有序，但大多数情况下，它们是动态地被抑制的。我们表明粒子各向异性表面改性并不总能在界面处产生良好的长程有序，尽管它为结构控制开辟了新的可能性。

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