Effect of heterogeneous particles and surfactants on the stability and rheology of fluid interfaces

异质颗粒和表面活性剂对流体界面稳定性和流变性的影响

• 批准号: 1934513
• 负责人: Sepideh Razavi
• 金额: $ 50万
• 依托单位: University of Oklahoma Norman Campus
• 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: 2019-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1934513&HistoricalAwards=false
• 关键词: Effect; heterogeneous; particles; surfactants; stability

Fluid-fluid interfaces, such as air-water interface in a soap bubble, are commonplace in a variety of products such as in household cleaning, cosmetics, and pharmaceuticals. Oftentimes, very small particles and some specific molecules (called surfactants) are used to stabilize such interfaces (to prevent them from popping). Therefore, the stability and strength of these interfaces is dictated by the type and strength of interactions between the small particles and surfactants. The goal of this project is to investigate the combined effect of particles and surfactants on the stability and flow behavior of interfaces. State-of-the-art laboratory experiments and computer simulations at the molecular level will be used in this research. This will lead to scientific advances in a wide range of technological applications from targeted delivery of drugs to recovery of oil trapped in underground reservoirs. The advanced experimental and computational techniques described in this project will also generate new knowledge to be used in educating students at both undergraduate and graduate level through the elective courses that will be offered by the investigators. The project will also support K-12 outreach activities that will be organized to demonstrate interfacial properties in soft materials to pre-college students in order to attract them to STEM disciplines.The proposed project will generate new fundamental knowledge on the interaction of heterogeneous colloidal particles and surfactant molecules in presence of interfaces. Tuning the assembly process using heterogeneous colloidal building blocks can advance the design of innovative materials and responsive structures. Additionally, the open nature of fluid interfaces makes them a promising platform for applications in which dynamic transport is crucial, such as bi-phasic catalytic reactions. Therefore, a critical knowledge gap exists in complex interfacial systems comprised of both heterogenous colloidal particles and surfactant molecules, especially in elucidating the rich physical mechanisms that affect the synergism of heterogeneous particles and surfactants at interfaces. Furthermore, fluid interfaces are not static and they are constantly subject to external disturbances; thus, there is a need to study the stability of these interfacial systems in response to applied stresses in order to develop a better understanding of their dynamic behavior and rheology in conditions relevant to real applications. Micro- and nanoparticles with several types of heterogeneities ? particularly shape and surface chemical heterogeneity ? will be fabricated and experimental analysis of particle-laden interfaces will be conducted in the absence of surfactants. Computations using coarse-grained techniques will be employed to understand the molecular interactions driving the experiments. The synergy between the experimental and computational tools will then be employed in more complex systems that involve both heterogeneous particles and surfactant molecules in order to address phenomena across multiple length and times scales (molecular scale interactions between micro- and nanoparticles and multifluid systems). The anticipated outcomes, rooted in fundamental understanding, include design rules for heterogeneous colloidal particles/surfactant systems with tailored interfacial behavior and rheology at fluid/fluid interfaces.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.

流体-流体界面，例如肥皂泡中的空气-水界面，在各种产品中很常见，例如家庭清洁、化妆品和药品。通常，非常小的颗粒和一些特定的分子（称为表面活性剂）用于稳定此类界面（以防止它们爆裂）。因此，这些界面的稳定性和强度取决于小颗粒和表面活性剂之间相互作用的类型和强度。该项目的目标是研究颗粒和表面活性剂对界面稳定性和流动行为的综合影响。这项研究将使用分子水平上最先进的实验室实验和计算机模拟。这将导致从靶向药物输送到回收地下水库中的石油等广泛技术应用领域的科学进步。该项目中描述的先进实验和计算技术还将产生新知识，用于通过研究人员提供的选修课程来教育本科生和研究生水平的学生。该项目还将支持 K-12 的外展活动，这些活动将组织向大学预科生展示软材料的界面特性，以吸引他们进入 STEM 学科。拟议的项目将产生关于界面存在下异质胶体颗粒和表面活性剂分子相互作用的新基础知识。使用异质胶体构建块调整组装过程可以推进创新材料和响应结构的设计。此外，流体界面的开放性使其成为动态传输至关重要的应用（例如双相催化反应）的有前途的平台。因此，由异质胶体颗粒和表面活性剂分子组成的复杂界面系统存在关键的知识差距，特别是在阐明影响异质颗粒和表面活性剂在界面处协同作用的丰富物理机制方面。此外，流体界面不是静态的，它们不断受到外部干扰。因此，有必要研究这些界面系统响应外加应力的稳定性，以便更好地了解它们在实际应用相关条件下的动态行为和流变学。具有几种异质性的微米颗粒和纳米颗粒 ?特别是形状和表面化学异质性？将在没有表面活性剂的情况下制造并进行颗粒负载界面的实验分析。使用粗粒度技术的计算将用于理解驱动实验的分子相互作用。然后，实验和计算工具之间的协同作用将被应用于涉及异质颗粒和表面活性剂分子的更复杂的系统中，以便解决跨多个长度和时间尺度的现象（微米和纳米粒子与多流体系统之间的分子尺度相互作用）。预期成果植根于基本理解，包括具有定制界面行为和流体/流体界面流变学的异质胶体颗粒/表面活性剂系统的设计规则。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点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

Effect of Janus particles and non-ionic surfactants on the collapse of the oil-water interface under compression

Janus颗粒和非离子表面活性剂对压缩下油水界面塌陷的影响

• DOI: 10.1016/j.jcis.2021.11.160
• 发表时间: 2021
• 期刊: Journal of colloid and interface science
• 影响因子: 9.9
• 作者: Tuan V. Vu, Sepideh Razavi

Contamination in Sodium Dodecyl Sulfate Solutions: Insights from the Measurements of Surface Tension and Surface Rheology

• DOI: 10.1021/acs.langmuir.2c00460
• 发表时间: 2022-05-31
• 期刊: LANGMUIR
• 影响因子: 3.9
• 作者: Correia, Elton L.;Brown, Nick;Razavi, Sepideh
• 通讯作者: Razavi, Sepideh

Adsorption of surfactant molecules onto the surface of colloidal particles: Case of like-charged species

• DOI: 10.1016/j.colsurfa.2023.132142
• 发表时间: 2023
• 期刊: Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 作者: E. L. Correia;S. Thakur;Aanahita Ervin;E. Shields;Sepideh Razavi

Surface tension anomaly observed for chemically-modified Janus particles at the air/water interface

• DOI: 10.1016/j.jcis.2019.09.084
• 发表时间: 2020-01-15
• 期刊: JOURNAL OF COLLOID AND INTERFACE SCIENCE
• 影响因子: 9.9
• 作者: Razavi, Sepideh;Hernandez, Laura M.;Kretzschmar, Ilona
• 通讯作者: Kretzschmar, Ilona

Influence of cap weight on the motion of a Janus particle very near a wall

• DOI: 10.1103/physreve.101.042606
• 发表时间: 2020-04-23
• 期刊: PHYSICAL REVIEW E
• 影响因子: 2.4
• 作者: Rashidi, Aidin;Razavi, Sepideh;Wirth, Christopher L.
• 通讯作者: Wirth, Christopher L.