在Quincke滚筒的脉冲刺激群体中发生自发冲击波
Bo Zhang1,2, Andreas Glatz3,4, Igor S Aranson5,6,7
1Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA. bz@nju.edu.cn.
Nature communications
|November 4, 2023
概括
脉冲电场在活性物质流体中诱导自发冲击波. 这些冲击波比单个粒子更快,源于昆克滚筒中的旋不稳定性.
科学领域:
- 物理 物理学 物理
- 软物质物理学 软物质物理学
- 非平衡系统 非平衡系统
背景情况:
- 活性物质表现出复杂的自我组织和集体行为,这种行为在平衡系统中不存在.
- 液体中的微观昆克滚筒是合成活性物质的模型系统.
- 调节电场可以控制活性物质组合中的动态状态.
研究的目的:
- 研究昆克滚筒系统中时间活动调制产生的动态状态.
- 描述由脉冲电场诱导的冲击波模式的形成和行为.
主要方法:
- 在脉冲电场下对粒子动态的实验观测.
- 理论建模以解释冲击波起源.
- 计算机模拟以验证实验发现和理论预测.
主要成果:
- 由连贯移动的粒子组成的冲击波模式的自发出现.
- 观察到冲击波的传播速度比粒子的平均速度快.
- 识别间歇性自发旋核心和旋曲的不稳定性作为冲击波的起源.
- 冲击波出现与可比的转换和旋转脱凝时间的相关性,由电脉冲持续时间控制.
结论:
- 脉冲电场可以在活性物质中产生新的动态状态,特别是冲击波.
- 冲击波形成与动力学和特定的时间控制参数有关.
- 这种现象是强大的,发生在没有限制的情况下,并表现出连续的冲击波的产生和消灭.
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