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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Structural Transitions and Hysteresis in Clump and Stripe-forming Colloids Under Dynamic Compression
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APS -APS March Meeting 2017 - Event - Structural Transitions and Hysteresis in Clump and Stripe-forming Colloids Under Dynamic Compression

机译：APS -APS 2017年3月会议-活动-在动态压缩下结块和条状胶体的结构转变和滞后

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Using numerical simulations, we study the dynamical evolution of particles interacting via competing long-range repulsion and short-range attraction in 2D. The particles are compressed using a time-dependent quasi-one dimensional trough potential that controls the local density, causing a series of structural phase transitions from a low density clump lattice to stripes, voids, and a high density uniform state. The compression proceeds via slow elastic motion that is interrupted with avalanche-like bursts of activity as the system collapses via plastic rearrangements. The plastic events vary in magnitude from small rearrangements of particles, including the formation of quadrupole-like defects, to large-scale vorticity and structural phase transitions. In the dense uniform phase, the system compresses through row reduction transitions mediated by a disorder-order process. We characterize the rearrangement events by measuring changes in the energy, the fraction of sixfold coordinated particles, the local density, and the velocity distribution. At high confinements, we find power law scaling of the velocity distribution during row reduction transitions. We observe hysteresis under a reversal of the compression when relatively few plastic rearrangements occur.
机译：使用数值模拟，我们研究了二维竞争中通过竞争的远距离排斥力和近距离吸引作用相互作用的粒子的动力学演化。使用控制局部密度的随时间变化的准一维谷势来压缩粒子，从而导致一系列结构相变，从低密度块状晶格过渡到条纹，空隙和高密度均匀状态。压缩通过缓慢的弹性运动而进行，缓慢的弹性运动在系统通过塑性重排崩溃时被雪崩般的活动中断而中断。塑性事件的大小不一，从微小的颗粒重排（包括形成四极状缺陷）到大规模的涡旋和结构相变。在密集均匀阶段，系统通过由无序顺序过程介导的行减少转换进行压缩。我们通过测量能量，六重配位颗粒的分数，局部密度和速度分布的变化来表征重排事件。在高约束下，我们发现行减少过渡期间速度分布的幂律定标。当发生相对较少的塑料重排时，我们会在压缩反转的情况下观察到磁滞现象。

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