Clustering and Charging in Granular Flows
颗粒流中的聚类和充电
基本信息
- 批准号:1309611
- 负责人:
- 金额:$ 56.5万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2013
- 资助国家:美国
- 起止时间:2013-06-15 至 2019-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
****Technical Abstract****The project employs freefalling streams of granular material to investigate particle interactions and aggregation in two closely coupled research efforts. First, tribocharging of same-material grains is investigated, a phenomenon of high significance scientifically as well as for applications, whose detailed mechanism is still being debated. Tracking tribocharged grains in dilute granular streams as they enter a region of uniform electric field makes it possible to collect the full statistical distribution of grain charge and its dependence on grain size. Results from this work will not only provide a better understanding of the fundamental mechanism giving rise to tribocharging, but also new insights that can help to control it. Second, by increasing the particle density inside the stream, the probability of particle-particle interactions can be increased systematically. This makes it possible to induce particle capture processes and follow in-situ the subsequent agglomeration into larger clusters, providing a first detailed look at the interplay of short-range cohesion and longer-range electrostatic forces. The project will train a PhD student and a postdoc in forefront materials research, and it includes the active participation of undergraduates. The research component of the project will be integrated with a multi-faceted set of education and outreach activities, including activities with the nearby Chicago Museum of Science and Industry.****Non-Technical Abstract****Granular materials are large aggregates of small particles. Within condensed matter physics and materials science, these materials pose a challenge because their complex behavior falls outside the established predictions for ordinary solids or liquids. At the same time, the handling, storage and transport of granular materials are critical to our economy, and improved knowledge opens up new opportunities for better control. The objective of this project is to establish a fundamental understanding of how particle collisions can drive agglomeration into particle clusters and what role electrostatic charging plays in this process. The research is centered around a unique experimental facility in which freely falling streams of particles are imaged and tracked with very high spatial and temporal precision. Better control of particle clustering and charging will impact areas from physics to engineering to environmental sciences. The clustering of charged particles is also relevant to the formation of aggregates in interstellar dust. The project will train a PhD student and a postdoc in forefront materials research, and it includes the active participation of undergraduates. The research will be integrated with a multi-faceted set of education and outreach activities, including activities with the nearby Chicago Museum of Science and Industry.
* 技术摘要 * 该项目采用颗粒材料的自由落体流,在两个紧密耦合的研究工作中研究颗粒相互作用和聚集。首先,研究了同种材料颗粒的摩擦荷电,这是一种具有高度科学意义和应用价值的现象,其详细机理仍在争论中。当颗粒流进入均匀电场区域时,跟踪稀颗粒流中的摩擦带电颗粒使得收集颗粒电荷的完整统计分布及其对颗粒尺寸的依赖性成为可能。从这项工作的结果将不仅提供了一个更好的理解的基本机制,引起摩擦充电,但也有新的见解,可以帮助控制它。第二,通过增加流内的粒子密度,粒子-粒子相互作用的概率可以系统地增加。 这使得有可能诱导颗粒捕获过程,并遵循原位随后的团聚成更大的集群,提供了第一个详细的看看短程凝聚力和长程静电力的相互作用。该项目将培养一名前沿材料研究的博士生和一名博士后,并包括本科生的积极参与。 该项目的研究部分将与多方面的教育和推广活动相结合,包括与附近的芝加哥科学与工业博物馆的活动。非技术摘要 * 颗粒材料是小颗粒的大聚集体。在凝聚态物理学和材料科学中,这些材料构成了一个挑战,因为它们的复杂行为福尔斯超出了普通固体或液体的既定预测。与此同时,粒状材料的处理、储存和运输对我们的经济至关重要,知识的提高为更好的控制开辟了新的机会。这个项目的目标是建立一个基本的了解如何粒子碰撞可以驱动凝聚成粒子簇和静电充电在这个过程中发挥什么作用。该研究围绕一个独特的实验设施进行,在该设施中,自由下落的粒子流以非常高的空间和时间精度进行成像和跟踪。更好地控制粒子聚集和充电将影响从物理到工程到环境科学的各个领域。 带电粒子的聚集也与星际尘埃中聚集体的形成有关。该项目将培养一名前沿材料研究的博士生和一名博士后,并包括本科生的积极参与。 这项研究将与多方面的教育和推广活动相结合,包括与附近的芝加哥科学与工业博物馆的活动。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Cluster formation by acoustic forces and active fluctuations in levitated granular matter
- DOI:10.1038/s41567-019-0440-9
- 发表时间:2019-05-01
- 期刊:
- 影响因子:19.6
- 作者:Lim, Melody X.;Souslov, Anton;Jaeger, Heinrich M.
- 通讯作者:Jaeger, Heinrich M.
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Heinrich Jaeger其他文献
Heinrich Jaeger的其他文献
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{{ truncateString('Heinrich Jaeger', 18)}}的其他基金
Acoustic Forces and Active Fluctuations in Levitated Granular Matter
悬浮颗粒物质中的声力和主动波动
- 批准号:
2104733 - 财政年份:2021
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
Ultrasonically Levitated Granular Matter
超声波悬浮颗粒物质
- 批准号:
1810390 - 财政年份:2018
- 资助金额:
$ 56.5万 - 项目类别:
Continuing Grant
New Approaches for the Design of Particulate Media
颗粒介质设计的新方法
- 批准号:
1605075 - 财政年份:2016
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
2016 Frontiers in Particle Science & Technology Conference
2016年粒子科学前沿
- 批准号:
1623943 - 财政年份:2016
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
Granular Materials Design and Optimization
颗粒材料设计与优化
- 批准号:
1334426 - 财政年份:2013
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
Mechanical Properties of Freestanding Nanoparticle Sheets
独立式纳米颗粒片的机械性能
- 批准号:
1207204 - 财政年份:2012
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
Investigation of Freestanding Nanoparticle Sheets
独立式纳米颗粒片的研究
- 批准号:
0907075 - 财政年份:2009
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
Freely-Falling Granular Powder Streams as Sensitive Probes of Interparticle Forces
自由落体颗粒粉末流作为颗粒间力的敏感探针
- 批准号:
0933242 - 财政年份:2009
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
SGER: Tuning the Conductance of Nanoparticle Arrays
SGER:调整纳米颗粒阵列的电导
- 批准号:
0751473 - 财政年份:2007
- 资助金额:
$ 56.5万 - 项目类别:
Standard Grant
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