| 项目编号: | 1509308
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| 项目名称: | UNS: Imaging inhomogeneous stress networks in colloidal glasses and gels to determine their role in the bulk response of disordered suspensions |
| 作者: | Itai Cohen
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| 承担单位: | Cornell University
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| 批准年: | 2014
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| 开始日期: | 2015-07-01
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| 结束日期: | 2018-06-30
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| 资助金额: | USD351819
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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: | glass
; colloidal suspension
; stress
; inhomogeneous stress network
; bulk mechanical behavior
; stress assessment
; glass property
; local stress
; project
; local stress network
; bulk rheological behavior
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| 英文摘要: | CBET - 1509308
Cohen, Itai
Through various processes a piece of glass can be designed to safely shatter, be bullet proof, or flexible and tough. The glass properties can be changed by manipulating the microscopic forces between the molecules that make up the glass. Learning how to better control the distribution of these microscopic forces and how they evolve under various loading conditions is an important technological challenge. This projects aims to visualize and determine the forces and construct models for the glass. The understanding gained through these studies will have very broad impact with the potential to change industrial manufacturing practices. Both graduate and undergraduate students will be involved in the research and outreach and conference programs will benefit student and postdoctoral researchers and industries in the up-state New York area.
The deformation of disordered dense colloidal suspensions is governed by the nonlinear behavior of inhomogeneous stress networks that develop within the material in response to applied stresses. Determining how evolution of these local stress networks governs bulk rheological behaviors remains an outstanding scientific challenge. A key hurdle for developing this understanding is the lack of methods for experimentally measuring the local stresses within suspensions. In this project, a novel method - Stress Assessment from Local Structural Anisotropy (SALSA)- will enable groundbreaking capabilities for determining stresses associated with sample volumes that extend down to the single particle scale. In combination with a newly developed confocal rheometer device, pioneering experiments including, indentation, compression, shear, and biaxial shear are being conducted to quantifying how inhomogeneous stress networks collude to govern the bulk mechanical behavior of dense disordered colloidal suspensions. The application of SALSA is also being extended to more complicated interparticle potentials arising from depletion interactions. This extended capability is being used to study how crack propagation is altered as the gel that it is traveling through approaches a percolation threshold. In addition to being excellent model systems, colloids are an important technology in and of themselves. In particular, controlling the jamming of colloidal suspensions is important for processing products ranging from toothpastes to paints. As such, the findings made through this project will have very broad impact with the potential to change practices in both the scientific and industrial communities. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/94297
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Itai Cohen. UNS: Imaging inhomogeneous stress networks in colloidal glasses and gels to determine their role in the bulk response of disordered suspensions. 2014-01-01.
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