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描绘了剪切稀释和加厚合体悬浮液的微观结构
Xiang Cheng1, Jonathan H McCoy, Jacob N Israelachvili
1Department of Physics, Cornell University, Ithaca, NY 14853, USA. xc92@cornell.edu
Science (New York, N.Y.)
|September 3, 2011
概括
体悬浮体由于粒子相互作用而表现出非牛顿式的行为. 这项研究将剪切薄化与热力和剪切厚化与水力动力力联系起来,揭示了复杂流体流动的微观起源.
科学领域:
- 复杂液体的风病学 复杂液体的风病学
- 体科学是一种体科学.
- 软物质物理学 软物质物理学
背景情况:
- 环状悬浮中的粘度取决于剪切率,影响自然和工业过程.
- 非牛顿行为背后的微观粒子动力学很难衡量.
- 了解粒子的排列和相互作用是解释流动特征的关键.
研究的目的:
- 调查合悬浮体中剪切稀释和剪切加厚的微观起源.
- 为了将宏观流动行为与微观粒子动态相关联.
- 为了展示一个结合的显微镜和力测量技术.
主要方法:
- 利用快速共聚焦显微镜进行粒子运动的高分辨率成像.
- 采用同步力测量来量化粒子间相互作用.
- 系统地研究了不同流量模式的悬浮结构.
主要成果:
- 剪切稀释归因于粒子水平上热力贡献的减少.
- 剪切厚度与由水力动力滑力驱动的粒子聚类有关.
- 在流转过程中直接观察到微观的单粒子动力学.
结论:
- 这项研究提供了直接的显微镜证据,证明了体悬浮中的非牛顿流的起源.
- 结合快速共聚焦显微镜和力测量,为研究复杂流体提供了强大的方法.
- 这些发现有助于我们更好地了解工业相关材料的质性质.
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