Dynamics of Stratification in Multicomponent Colloidal Films During Evaporative Drying

蒸发干燥过程中多组分胶体膜的分层动力学

• 批准号: 1903189
• 负责人: Surita Bhatia
• 金额: $ 34.79万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1903189&HistoricalAwards=false
• 关键词: Dynamics; Stratification; Multicomponent; Colloidal; Films

Nanoparticle films have wide applications, including antibacterial paints, corrosion-resistant coatings, and battery separator membranes. Often, the locations of certain components in the film must be carefully controlled. This has traditionally been achieved with expensive multi-step fabrication processes. Recent mathematical models of nanoparticle film formation have identified a means to create complex, vertically-structured coatings in a single step, a process referred to as stratification. This process has the potential to decrease production time and costs of multifunctional nanoparticle films. However, there are few experimental studies of the stratification process. In this project, a new experimental technique that involves scanning through the film with a narrowly-focused X-ray beam will be performed during the stratification process. These experiments will follow motion of particles throughout the film formation process, and will ultimately provide information on how stratification depends on the nanoparticle concentration, nanoparticle size, evaporation rate, and other processing parameters. The research will help improve manufacturing processes for multicomponent films used in applications that will benefit human welfare and health, such as inorganic-polymer films for next-generation batteries, drug-loaded coatings for medical implants, and mold-resistant paints for humid environments. Impacts related to STEM workforce development include training of a graduate student and undergraduate students in novel experimental techniques for colloidal materials. The investigator will also aim to recruit students from underrepresented populations for the research. Finally, concepts from the research will be incorporated into new curriculum materials and video lectures on fluid mechanics for high school audiences. Recent research has identified a means to create vertically-structured coatings in a single step during stratification. Theoretical descriptions of binary colloidal mixtures show a variety of stratification regimes as the volume fraction and Peclet number of small and large particles are varied. However, comprehensive comparison of model predictions with experiments has not yet been achieved because of difficulties in (i) quantifying the vertical concentration profile of particles in the film, and (ii) following motion of particles during the film formation process. This project will use small-angle X-ray scattering (SAXS) with a narrowly-focused beam, performed at varying vertical positions in the film, to fully explore the complex stratification behavior predicted by recent models. The objectives of the work are to: (1) create an experimental process diagram of stratification behavior as a function of particle volume fraction and Peclet number; (2) conduct the first measurements of stratification during film formation by performing time-resolved microbeam SAXS; (3) conduct X-ray photon correlation spectroscopy (XPCS) studies to yield knowledge of how particle diffusivity and dynamics vary during film formation; and (4) integrate research into new curricular materials and video lectures on fluid mechanics for high school audiences. The work will provide the first in situ measurements of particle concentration during film formation in multicomponent systems and the first direct experimental test of recent stratification models in both final dried films and during the film formation process. The project will also help establish new advanced scattering techniques for characterization of colloidal materials. Finally, the data and insight gained will aid in driving improvements to theoretical descriptions of stratification. The research will broadly impact development of single-step processes to create multicomponent films with complex concentration profiles, decreasing production time and costs of multifunctional films.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.

纳米颗粒膜具有广泛的应用，包括抗菌油漆，耐腐蚀涂料和电池分离器膜。通常，必须仔细控制膜中某些组件的位置。传统上，这是通过昂贵的多步制造工艺实现的。纳米颗粒膜形成的最新数学模型已经确定了一种在单个步骤中创建复杂的垂直结构涂层的手段，该过程称为分层。这个过程有可能减少多功能纳米颗粒膜的生产时间和成本。但是，对分层过程的实验研究很少。在这个项目中，将在分层过程中执行一种新的实验技术，该技术涉及在薄膜中扫描胶片。这些实验将遵循颗粒在整个膜形成过程中的运动，并最终将提供有关分层如何依赖纳米颗粒浓度，纳米颗粒大小，蒸发速率和其他处理参数的信息。这项研究将有助于改善用于将有益于人类福利和健康的应用中的多组分膜的制造过程，例如用于下一代电池的无机聚合物膜，用于医疗植入物的药物涂料以及用于湿润环境的抗霉菌涂料。与STEM劳动力发展有关的影响包括培训研究生和本科生在新颖的胶体材料实验技术中的培训。调查人员还将旨在招募来自代表性不足人群的学生进行研究。最后，该研究的概念将纳入有关高中观众流体力学的新课程材料和视频讲座中。最近的研究已经确定了一种在分层过程中单个步骤创建垂直结构涂层的手段。二进制胶体混合物的理论描述显示出各种分层状态，因为小颗粒的体积分数和小粒子数量变化。然而，由于（i）量化膜中粒子的垂直浓度谱的困难，并且（ii）在膜形成过程中粒子运动后（ii），尚未实现模型预测与实验的全面比较。该项目将使用带有狭窄的光束的小角度X射线散射（SAX），在膜中不同的垂直位置进行，以充分探索最近模型预测的复杂分层行为。工作的目标是：（1）创建一个分层行为的实验过程图，其粒子体积分数和小子数的函数； （2）通过执行时间分辨的微束SAXS进行膜形成过程中分层的第一个测量； （3）进行X射线光子相关光谱（XPCS）研究，以使膜形成过程中颗粒扩散率和动力学的知识如何变化； （4）将研究纳入有关高中受众流体力学的新课程材料和视频演讲。这项工作将提供在多组分系统中膜形成过程中粒子浓度的第一个原位测量，以及在最终干膜和膜形成过程中对最近分层模型的第一个直接实验测试。该项目还将有助于建立新的先进散射技术，以表征胶体材料。最后，获得的数据和洞察力将有助于推动分层的理论描述。这项研究将广泛影响单步过程的开发，以创建具有复杂浓度概况的多组分电影，减少了多功能电影的生产时间和成本。该奖项反映了NSF的法定任务，并被认为值得通过基金会的知识分子优点和更广泛的影响来通过评估来进行评估。

项目成果

Dual‐Scale Nanostructures via Evaporative Assembly

• DOI: 10.1002/admi.201901954
• 发表时间: 2020-02
• 期刊: Advanced Materials Interfaces
• 影响因子: 5.4
• 作者: S. Srivastava;Zaibudeen A. Wahith;O. Gang;C. Colosqui;S. Bhatia

Dynamics and microrheology of colloidal clay-polymer glasses and gels: Size-dependent phenomena and re-entrant behavior at early aging times

胶体粘土聚合物玻璃和凝胶的动力学和微流变学：早期老化时的尺寸依赖性现象和重入行为

• DOI: 10.1063/5.0130816
• 发表时间: 2023
• 期刊: The Journal of Chemical Physics
• 作者: Shen, Jiachun;Bhatia, Surita R.
• 通讯作者: Bhatia, Surita R.

Collective Nanoparticle Dynamics Associated with Bridging Network Formation in Model Polymer Nanocomposites

与模型聚合物纳米复合材料中桥接网络形成相关的集体纳米粒子动力学

• DOI: 10.1021/acsnano.1c01283
• 发表时间: 2021
• 期刊: ACS Nano
• 影响因子: 17.1
• 作者: Yavitt, Benjamin M.;Salatto, Daniel;Zhou, Yuxing;Huang, Zhixing;Endoh, Maya;Wiegart, Lutz;Bocharova, Vera;Ribbe, Alexander E.;Sokolov, Alexei P.;Schweizer, Kenneth S.
• 通讯作者: Schweizer, Kenneth S.

Mapping graphene layer number at few-micron-scale spatial resolution over large areas using laser scanning

• DOI: 10.1088/2053-1583/abcbe7
• 发表时间: 2020-11
• 期刊: 2D Materials
• 影响因子: 5.5
• 作者: A. Carr;Daniel DeGennaro;J. A. Andrade;Alexander Barrett;S. Bhatia;M. Eisaman

XPCS Microrheology and Rheology of Sterically Stabilized Nanoparticle Dispersions in Aprotic Solvents

• DOI: 10.1021/acsami.1c00474
• 发表时间: 2021-03-16
• 期刊: ACS APPLIED MATERIALS & INTERFACES
• 影响因子: 9.5
• 作者: Liu, Weiping;Zheng, Bingqian;Bhatia, Surita R.
• 通讯作者: Bhatia, Surita R.