Confinement-Controlled Self Assembly of Colloids with Simultaneous Isotropic and Anisotropic Cross-Section
Confinement-Controlled Self Assembly of Colloids with Simultaneous Isotropic and Anisotropic Cross-Section
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DOI：
10.1021/la100361y
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发表时间：
2010-07-20
期刊：
影响因子：
3.9
通讯作者：
Liddell, Chekesha M.
中科院分区：
文献类型：
--
作者：
Riley, Erin K.;Liddell, Chekesha M.
在二维和准二维限制条件下探索了具有蘑菇帽状颗粒形态的积木的相行为。沉积在楔形池中的颗粒的快速共焦显微镜成像揭示了一系列单层和双层结构，部分由颗粒几何形状的各向同性和各向异性轮廓引导。随着限制高度的增加而跟踪的相序列包括在球体中报告的相，以及在一类短棒状胶体中观察到的更复杂的旋转体和方向相关相。在后一种情况下，主要颗粒轴相对于基材重新定向。最密堆积考虑因素为观察到的 1 Delta（六边形）-1Buckled-1Sides（旋转器）-2 square（正方形）-2 Delta（六边形）-2Sides（旋转器）随高度的结构转变提供了理论依据。
The phase behavior of building blocks with mushroom cap-shaped particle morphology is explored under 2D and quasi-2D confinement conditions. Fast confocal microscopy imaging of the particles sedimented in a wedge cell reveals a range of mono- and bilayer structures partially directed by the isotropic and anisotropic profiles of the particle geometry. The sequence of phases tracked with increasing confinement height includes those reported in spheres, in addition to the more complex rotator and orientation-dependent phases observed for a class of short rod-like colloids. In the later case, the major particle axis reorients with respect to the substrate. Closest packing considerations provide rationale for the observed 1 Delta (hexagonal)-1Buckled-1Sides (rotator)-2 square(square)-2 Delta (hexagonal)-2Sides (rotator) structural transitions with height.