通过集群破裂进行稀释:活性物质和剪切流共享稀释机制
Ruoyang Mo1,2,3, Ding Xu1,2,3, Ning Xu1,2,3
1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, People's Republic of China.
概括
活性物质,如细菌悬浮液,表现出类似超流体的稀释. 这项研究揭示了活性物质和剪切流之间的共同集群破裂机制,解释了这两种系统中的粘度下降.
科学领域:
- 物理 物理学 物理
- 软物质物理学 软物质物理学
- 生物物理学的生物物理.
背景情况:
- 活性物质系统,如细菌悬浮,显示独特的现象,如超流体类稀释.
- 了解这种粘度下降背后的机制对于理论和实际应用至关重要.
研究的目的:
- 为了研究活性物质的自行减薄现象.
- 阐明负责活性物质悬浮体粘度降低的潜在机制.
- 建立活性物质的稀释行为和传统的剪切流之间的联系.
主要方法:
- 活性物质悬浮和剪切流的比较分析.
- 结构特征技术,观察粒子排列和集群动态.
- 风湿学测量以量化粘度变化.
主要成果:
- 活性物质和剪切流在增加的自推力和剪切力下呈现出相似的稀释行为.
- 一个共同的集群破裂机制被确定为两种系统稀释的原因.
- 集群碎片化的速度和程度决定了观察到的稀释的连续性.
结论:
- 提出了一种用于活性物质自动稀释的新型机制.
- 该研究确立了活性物质和剪切流的气体学性质之间的基本联系.
- 活性粒子的旋转被确定为集群破坏和随后的稀释的关键因素.
相关概念视频
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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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01:19Shearing Stress
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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
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01:20Shearing Strain
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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between...
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01:17Steady, Laminar Flow Between Parallel Plates
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01:20Elastic Strain Energy for Shearing Stresses
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01:14Normal and Shear Force
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