Controlling Shear-Induced Migration in Colloid/Polymer Mixtures
控制胶体/聚合物混合物中剪切引起的迁移
基本信息
- 批准号:1803728
- 负责人:
- 金额:$ 30万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2018
- 资助国家:美国
- 起止时间:2018-07-01 至 2023-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Mixtures of small, rigid particles in solutions of polymers are widely used in advanced technologies such as 3-D printing and energy storage. The particles impart function, such as conductivity needed to transport electrons through 3-D printed wires. The polymers are added to control the flow behavior of the mixture. Tuning the properties of these mixtures requires controlling the distribution of the particles -- conductivity, for example, requires the particles to form a connected network. One factor that affects particle distribution during flow is shear-induced migration, in which particles migrate away from the walls and accumulate near the center of a narrow channel. This project will use experiments to determine the effect of polymers in solution on the distribution of particles as they flow through narrow channels. This knowledge will provide new routes to control the structure and functional properties of particulate suspensions for applications in next-generation energy storage and transport.Suspensions of microscale particles in complex fluids offer transformative opportunities in materials engineering for energy storage and transport. Miniaturizing these technologies requires increasing the suspension conductivity, by ensuring particle connectivity, while minimizing clogging in small channels. Complex fluid additives such as polymers or surfactants needed for suspension function or stability, however, may alter particle connectivity and density. Hence controlling particle density in the presence of additives is essential for attaining the desired functional properties of confined particulate suspensions. Polymers added to particulate suspensions may alter shear-induced migration, one mechanism that generates non-uniform density profiles in confined flows, in at least two ways: by generating aggregates or by enhancing normal stresses. Systematic understanding of how to control microscale particle migration in polymer solutions is currently lacking. The objective of this project is to understand how polymers alter shear-induced migration of colloidal particles during microchannel flow. To test the hypothesis that the extent of migration reflects competition between polymer-enhanced normal stresses and polymer-driven migration, the PI will use bulk rheology and microchannel confocal imaging experiments to characterize the normal stresses and particle microstructure in strongly and weakly migrating suspensions containing either adsorbing or non-adsorbing polymers. Measurements of particle velocity and concentration profiles will be compared to existing theoretical models for shear-induced migration of hard-sphere particles in simple liquids. This plan of work will identify the relative impact of the two competing mechanisms on shear-induced migration, leading to unprecedented control over particle density in models of technologically important materials and allowing existing models for shear-induced migration to be extended to include polymer-mediated interactions. This project will thus generate new design rules for suspensions to maximize particle connectivity during complex fluid flow while minimizing clogging. The PI will disseminate results to scientists in Houston's energy and medical industries through tutorial workshops aimed at oil and gas professionals and through the Texas Soft Matter meeting, which she founded and organizes, and will expand her ongoing outreach activities to K-12 students and the general public to include new hands-on activities on complex fluid flow.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
在聚合物溶液中的小的刚性颗粒的混合物被广泛用于先进技术,如3D打印和能量存储。这些颗粒赋予功能,例如通过3D打印导线传输电子所需的导电性。添加聚合物以控制混合物的流动行为。调节这些混合物的性质需要控制颗粒的分布--例如,导电性要求颗粒形成一个连接的网络。在流动过程中影响颗粒分布的一个因素是剪切引起的迁移,其中颗粒远离壁迁移并聚集在狭窄通道的中心附近。该项目将使用实验来确定溶液中的聚合物对流经狭窄通道的颗粒分布的影响。这些知识将为控制下一代能源储存和运输应用中颗粒悬浮液的结构和功能特性提供新的途径。复杂流体中微米级颗粒的悬浮液为能源储存和运输的材料工程提供了变革性的机会。这些技术的小型化需要通过确保颗粒连接性来提高悬浮液的电导率,同时最大限度地减少小通道中的堵塞。然而,悬浮功能或稳定性所需的复杂流体添加剂,如聚合物或表面活性剂,可能会改变颗粒的连通性和密度。因此,在添加剂存在下控制颗粒密度对于获得受限颗粒悬浮液的期望功能性质是必不可少的。添加到颗粒悬浮液中的聚合物可以至少以两种方式改变剪切诱导的迁移,这是在受限流中产生不均匀密度分布的一种机制:通过产生聚集体或通过增强法向应力。目前缺乏对如何控制聚合物溶液中微尺度颗粒迁移的系统理解。这个项目的目的是了解聚合物如何改变微通道流动过程中胶体颗粒的剪切诱导迁移。为了检验迁移程度反映聚合物增强法向应力和聚合物驱动迁移之间竞争的假设,PI将使用本体流变学和微通道共聚焦成像实验来表征含有吸附或非吸附聚合物的强迁移和弱迁移悬浮液中的法向应力和颗粒微观结构。颗粒速度和浓度分布的测量将进行比较,现有的理论模型剪切诱导迁移的硬球颗粒在简单的液体。这项工作计划将确定两种竞争机制对剪切诱导迁移的相对影响,从而对技术上重要的材料模型中的颗粒密度进行前所未有的控制,并允许现有的剪切诱导迁移模型扩展到包括聚合物介导的相互作用。因此,该项目将产生新的悬浮液设计规则,以最大限度地提高复杂流体流动过程中的颗粒连通性,同时最大限度地减少堵塞。PI将通过针对石油和天然气专业人士的教程研讨会以及她创立和组织的德克萨斯州软物质会议,向休斯顿能源和医疗行业的科学家传播研究结果,并将扩大她正在进行的外展活动,以K-12学生和公众,包括新的手-该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Dynamics of Flexible Viruses in Polymer Solutions
- DOI:10.1021/acs.macromol.1c00435
- 发表时间:2021-05
- 期刊:
- 影响因子:5.5
- 作者:Maxwell Smith;R. Poling-Skutvik;Ali H. Slim;R. Willson;J. Conrad
- 通讯作者:Maxwell Smith;R. Poling-Skutvik;Ali H. Slim;R. Willson;J. Conrad
Aggregation and gelation in a tunable aqueous colloid–polymer bridging system
可调水性胶体-聚合物桥联系统中的聚集和凝胶化
- DOI:10.1063/5.0101697
- 发表时间:2022
- 期刊:
- 影响因子:0
- 作者:Gallegos, Mariah J.;Soetrisno, Diego D.;Park, Nayoung;Conrad, Jacinta C.
- 通讯作者:Conrad, Jacinta C.
Concentration Regimes for Extensional Relaxation Times of Unentangled Polymer Solutions
非缠结聚合物溶液的拉伸弛豫时间的浓度范围
- DOI:10.1021/acs.macromol.3c00097
- 发表时间:2023
- 期刊:
- 影响因子:5.5
- 作者:Soetrisno, Diego D.;Martínez Narváez, Carina D.;Sharma, Vivek;Conrad, Jacinta C.
- 通讯作者:Conrad, Jacinta C.
Structure Dominates Localization of Tracers within Aging Nanoparticle Glasses
结构主导老化纳米粒子玻璃内示踪剂的定位
- DOI:10.1021/acs.jpclett.9b00309
- 发表时间:2019
- 期刊:
- 影响因子:0
- 作者:Poling-Skutvik, Ryan;Roberts, Ryan C.;Slim, Ali H.;Narayanan, Suresh;Krishnamoorti, Ramanan;Palmer, Jeremy C.;Conrad, Jacinta C.
- 通讯作者:Conrad, Jacinta C.
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Jacinta Conrad其他文献
Jacinta Conrad的其他文献
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{{ truncateString('Jacinta Conrad', 18)}}的其他基金
Active living emulsions driven by bacteria
由细菌驱动的活性活性乳液
- 批准号:
2104796 - 财政年份:2021
- 资助金额:
$ 30万 - 项目类别:
Continuing Grant
Collaborative Research: Role of Polymer Sequence on Penetrant Transport in Charged Brushes
合作研究:聚合物序列对带电刷中渗透剂传输的作用
- 批准号:
2113769 - 财政年份:2021
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
Non-Classical Mechanisms of Solution Crystallization Studied Using Colloidal Experiments and Simulations
使用胶体实验和模拟研究溶液结晶的非经典机制
- 批准号:
1904531 - 财政年份:2019
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
UNS: Role of Reporter and Membrane Properties for the Sensitivity of Viral Nanoparticle Lateral Flow Assays
UNS:报告基因和膜特性对病毒纳米颗粒侧向层析检测灵敏度的作用
- 批准号:
1511789 - 财政年份:2015
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
Role of Attractions in Modifying the Confined Flow of Colloids
吸引力在改变胶体受限流中的作用
- 批准号:
1438204 - 财政年份:2014
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
CAREER: Role of Surface Properties in Motility of Bacteria to Control Biofilms
职业:表面特性在控制生物膜的细菌运动中的作用
- 批准号:
1151133 - 财政年份:2012
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
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