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People have observed the rolling motion without slipping ever since the invention of the wheel. For example, one can look at the interaction between a car's tires and the surface of the road. If the driver presses the accelerator to the floor so that the tires spin without the car moving forward, there must be kinetic friction between the wheels and the road's surface. If the driver slowly presses the accelerator, causing the car to move forward, the tires roll without slipping. It is...
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在活性晶体旋转器中滑动和流体化

Abraham Mauleon-Amieva1,2, Tanniemola B Liverpool3, Ian Williams4

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六角晶体中的活性合体表现出棒滑动性,在静态和滑动状态之间进行过渡. 这种行为为纳米摩擦和活性物质设计提供了洞察力.

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科学领域:

  • 物理
  • 材料科学
  • 软物质物理学

背景情况:

  • 在平衡系统中,可比性控制了纳米尺度的摩擦和晶体产量.
  • 在研究活性物质方面,正在出现相称性概念.
  • 活跃的体提供了一个模型系统来探索超越平衡物理的现象.

研究的目的:

  • 开发一个实验平台和在封闭晶体中的活性合体的理论框架.
  • 研究粒子活动与晶体结构之间的相互作用.
  • 了解新奇的动态,如自剪,流转,和活跃的棒滑行为.

主要方法:

  • 使用圆形形状的昆克滚筒实验实现活性合晶体.
  • 专注于61个粒子的完美六角晶体.
  • 理论描述,使用离散的活性水力学模型和扩展的Frenkel-Kontorova (FK) 模型.

主要成果:

  • 观察到粒子固体和自我推进之间的竞争导致自我剪切和流量逆转.
  • 发现了活跃的棒滑动力学,其特点是相称的静态和不相称的自滑状态之间的过渡.
  • 在自动滑动过程中发现活动诱导的化和局部缺陷.

结论:

  • 活跃的合晶体表现出丰富的动态,包括由自我推进驱动的棒滑行为.
  • 这些发现为了解活性固体及其潜在应用提供了一个模型系统.
  • 这项研究提供了使用活性物质的纳米级组装和机器人的设计原理.