Reversible Self-Assembly (fcc-bct) Crystallization of Confined Granular Spheres via a Shear Dimensionality Mechanism
Reversible Self-Assembly (fcc-bct) Crystallization of Confined Granular Spheres via a Shear Dimensionality Mechanism
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DOI：
10.1103/physrevlett.121.074302
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发表时间：
2018-08-17
影响因子：
8.6
通讯作者：
Carvente, O.
中科院分区：
文献类型：
--
作者：
Morales-Barrera, D. A.;Rodriguez-Gattorno, G.;Carvente, O.
通过结合振动退火和剪切维数，我们通过实验证明了（1）在由耗散毫米级干球组成的颗粒系统中的快速可逆结晶 fcc-bct（面心立方体心四方晶系），（2）二维（平面）剪切促进自组装成 fcc 晶体，而一维剪切产生 bct 晶体，以及（3）与异质体类似成核过程中，颗粒温度梯度导致晶域的形成，显示出冷区多晶相的竞争。我们的研究结果表明，控制相互作用的方向性可以引导硬球的可逆结晶，为理论研究提供线索，并为自组装声子晶体应用的技术发展提供新的机制。
By combining vibrational annealing and shear dimensionality, we experimentally show (1) a fast reversible crystallization fcc-bct (face-centered cubic-body-centered tetragonal) in a granular system that is composed of dissipative millimeter-sized dry spheres, (2) a two-dimensional (planar) shear promotes self-assembly into an fcc crystal, while one-dimensional shear produces a bct crystal, and (3) in analogy with heterogeneous nucleation, a granular temperature gradient leads to the formation of crystal domains showing competition of polymorphic phases in the cold regions. Our findings suggest that controlling the directionality of the interactions steers to reversible crystallization of hard spheres, adds clues for theoretical studies, and provides a novel mechanism for the technological development of the applications of self-assembling phononic crystals.