| 项目编号: | 1702418
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| 项目名称: | Microdynamics and Macroscopic Function of Active Colloidal Gels |
| 作者: | Michael Solomon
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| 承担单位: | University of Michigan Ann Arbor
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| 批准年: | 2017
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| 开始日期: | 2017-09-01
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| 结束日期: | 2020-08-31
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| 资助金额: | 346740
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | colloidal gel
; gel
; active particle
; fractal cluster gel
; macroscopic rheology
; macroscopic functional property
; colloidal particle
; active colloid
; macroscopic rheological function
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| 英文摘要: | CBET - 1702418
PI: Solomon, Michael
When a concentrated suspension of colloidal particles forms networks of particles, the result is a material called a soft colloidal gel. The elastic properties of colloidal gels can be tuned by changing the characteristics of the particles, which makes colloidal gels useful in many consumer products, agricultural applications, and pharmaceuticals. This award will support the development and characterization of colloidal gels that incorporate active particles into their structures. Active particles can generate their own propulsion under certain conditions. When active particles are embedded in a colloidal gel, the extent to which the properties of the gel can be varied and controlled is expanded, which could increase the use of colloidal gels in practice. The properties of the gels containing active particles will be investigated using a combination of microscopy and mechanical testing. Results of the research will be disseminated through an industry/academic workshop. In addition, the research will be used to create hands-on demonstrations for middle school girls participating in a summer school that introduces young students to engineering.
This project will establish the relationship between the microdynamics of active colloids embedded in colloidal gels and their macroscopic functional properties of linear elasticity and non-linear yielding. These micro/macro relationships will be generated by investigating active colloids introduced into fractal cluster gels, a system whose structure, dynamics, elasticity, and yielding are well understood for the case of passive, Brownian colloids. Active platinum Janus particles driven by hydrogen peroxide decomposition, two-channel confocal microscopy, fractal cluster gel self-assembly, and macroscopic rheology with a novel, permeable fixture will be used to discover: (i) how microscopic activity affects the linear elastic modulus of gels; (ii) how internally-induced yielding presents macroscopically, and; (iii) how consolidation and disintegration of gels is produced by the external pressure of active colloids. The work will yield insight into how the unusual microdynamics of active systems determine their macroscopic rheological function. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/89155
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Michael Solomon. Microdynamics and Macroscopic Function of Active Colloidal Gels. 2017-01-01.
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