| 项目编号: | 1543875
|
| 项目名称: | EAGER: Rheo-NMR measurement of spatiotemporal dynamics in shear banding wormlike micelle solutions |
| 作者: | Jennifer Brown
|
| 承担单位: | Montana State University
|
| 批准年: | 2014
|
| 开始日期: | 2015-08-15
|
| 结束日期: | 2017-07-31
|
| 资助金额: | USD99999
|
| 资助来源: | US-NSF
|
| 项目类别: | Standard Grant
|
| 国家: | US
|
| 语种: | 英语
|
| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
|
| 英文关键词: | shear banding
; shear band
; shear-induced banding
; warmlike micelle solution
; wlm solution
; rheo-nmr
|
| 英文摘要: | It has been found that during the processing of a class of fluids, e.g., surfactants and polymers, the applied shear can lead to non-homogeneities in the solution, a phenomenon called shear-induced banding. This is a proposal to develop accurate and elegant experiments to understand this process, impacting current practice in several industries and potentially allowing the design of better manufacturing techniques for such materials. Research with impact in manufacturing addresses an area identified as an area of National need.
The banding of macromolecular soft materials is currently under investigation theoretically, but there are very few laboratories in the world that have the capability to conduct the experiments that will determine the fundamental mechanism behind this phenomenon. The PI's laboratory is one of these, and she is proposing to develop a molecular level experimental technique to dynamically observe shear banding. It is proposed to provide experimental spatiotemporal velocity and microstructure data in order to test existing theory and inform future modeling efforts relevant to the dynamics of shear banding in warmlike micelle solutions (WLMs) under time dependent conditions. Specific objectives include: (1) detect shear banding in WLMs using rapid Rheo-NMR velocity imaging to test the university criteria proposed by prior theories, (2) measure and quantify time and lengthscales of velocity fluctuation, as correlated with transient stress responses, using rapid Rheo-NMR velocity imaging and flow compensated pulsed gradient spin echo (PGSE) NMR, and (3) measure molecular level ordering for WLM solutions via 2H spectroscopy as correlated with shear banding and velocity fluctuation. Rheo-NMR techniques are non-invasive, non-destructive and offer information ranging from the macroscopic to the microscopic, providing insight into the formation of shear bands under start-up conditions and oscillatory flow as well as the coupling between the flow field, microstructure and transient stress. The proposed work will have an impact on the polymer, surfactant, chemical and food industry, where control of material properties and of complex fluids is important. Graduate and undergraduate student participation is proposed, as well as outreach activities to URM students across Montana. |
| 资源类型: | 项目
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93689
|
| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
Jennifer Brown. EAGER: Rheo-NMR measurement of spatiotemporal dynamics in shear banding wormlike micelle solutions. 2014-01-01.
|
|
|