Foamability of Ionic Micellar Solutions: Adsorption Kinetics and Supramolecular Surface Forces

离子胶束溶液的发泡性：吸附动力学和超分子表面力

• 批准号: 1806011
• 负责人: Vivek Sharma
• 金额: $ 32.93万
• 依托单位: University of Illinois at Chicago
• 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: 2018-09-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806011&HistoricalAwards=false
• 关键词: Foamability; Ionic; Micellar; Solutions; Adsorption

Aqueous micellar solutions of ionic surfactants play a significant role in diverse applications including biological membranes, fat-digestion, detergents, petrochemical processes, chemical catalysis, etc. Foams are ubiquitous as they exhibit a range of complex, unique and useful properties. The proposed research aims to develop the scientific and engineering foundations for understanding foam stability and formability of ionic micellar solutions. Obtaining comprehensive experimental data and developing methods for describing adsorption kinetics and supramolecular forces for ionic surfactants are primary motivations for this study. Another goal is to find quantifiable measures of heuristic criteria like foamability and foam stability and correlate them to physicochemical properties of surfactants to aid in the discovery of better surfactants, including biodegradable bio-surfactants.Foams contain a complex architecture of thin films and channels, and, at the molecular level, foam films are stabilized by surfactants. Layering of micelles in foam films results in stratification, manifested as stepwise thinning and coexistence of regions with different thicknesses. The layering contributes supramolecular oscillatory surface forces to disjoining pressure, that influence the stability of foam films. The proposed experimental and theoretical research focuses on understanding the adsorption kinetics and foam film stability of ionic surfactants, to quantitatively analyze the influence of charge on dynamical and equilibrium measurement of surface tension and disjoining pressure dominated by supramolecular structural forces. The PI proposes to correlate foamability to adsorption kinetics characterized by using maximum bubble pressure apparatus built by the PI's group and foam stability to supramolecular structural forces using a modified thin film balance apparatus. The theoretical effort will focus on developing a robust free-energy based framework for quantifying the influence of charge on both adsorption kinetics and supramolecular structural forces. A focused summer experimental research initiative is proposed to bring together a team of undergraduate students at UIC to conduct experiments in the realm of soft matter at interfaces. A course titled 'Fizzics and Interfacial Phenomena', developed by the PI, will be offered as an interdisciplinary elective to graduate and undergraduate students. Fizzics (or the science of drops, bubbles, emulsions and foams), optics, rheology and mechanics of complex fluids will form the basis for outreach activities. The participating students will develop several low-cost, robust instruments for studying interfacial phenomena and will make the instruments available to K-12 teachers.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.

离子表面活性剂的胶束溶液在不同的应用中起着重要作用，包括生物膜，脂肪消化，洗涤剂，石化过程，化学催化等。泡沫无处不在，因为它们表现出一系列复杂，独特和有用的特性。拟议的研究旨在开发科学和工程基础，以理解离子胶束溶液的泡沫稳定性和形成性。获取全面的实验数据和开发用于描述离子表面活性剂吸附动力学和超分子力的方法是这项研究的主要动机。另一个目标是找到可量化的启发式标准措施，例如泡沫性和泡沫稳定性，并将它们与表面活性剂的物理化学特性相关联，以帮助发现更好的表面活性剂，包括可生物降解的生物表面活性剂。粉丝均包含薄膜和频道的复杂建筑。泡沫膜中胶束的分层导致分层，表现为逐步变薄和厚度不同的区域共存。该分层有助于超分子振荡的表面力使压力不结合，从而影响泡沫膜的稳定性。拟议的实验和理论研究重点是理解离子表面活性剂的吸附动力学和泡沫膜稳定性，以定量分析电荷对表面张力的动力和平衡测量的影响，并分离以超分子结构力为主导的表面压力的影响。 PI提议将泡沫性与使用PI组建立的最大气泡压力设备和泡沫稳定性以及使用改良的薄膜平衡设备的超分子结构力相关的吸附动力学。理论上的工作将着重于开发一个可靠的基于自由能的框架，以量化电荷对吸附动力学和超分子结构力的影响。提出了一项重点的夏季实验研究计划，旨在将UIC的一组本科生团队召集在一起，以在界面的软物质领域进行实验。 PI开发的标题为“ Fizzics和界面现象”的课程将作为跨学科的毕业生和本科生提供。 FIZZICS（或滴，气泡，乳液和泡沫的科学），光学，流动性的光学和机制将构成外展活动的基础。参与的学生将开发几种低成本，强大的工具来研究界面现象，并将使K-12教师提供这些仪器。该奖项反映了NSF的法定任务，并认为值得通过基金会的知识分子优点评估来支持支持，并具有更广泛的影响标准。

项目成果

Surface forces and stratification in foam films formed with bile salts

• DOI: 10.1039/d0me00024h
• 发表时间: 2021-05-28
• 期刊: MOLECULAR SYSTEMS DESIGN & ENGINEERING
• 影响因子: 3.6
• 作者: Kemal, Subinur Ilshat;Uribe Ortiz, Camila Alexandra;Sharma, Vivek
• 通讯作者: Sharma, Vivek

The rheologically-complex fluid beauty of nail lacquer formulations

指甲油配方的流变复杂流体美感

• DOI: 10.1039/d0sm02248a
• 发表时间: 2021
• 期刊: Soft Matter
• 影响因子: 3.4
• 作者: Jimenez, Leidy Nallely;Martínez Narváez, Carina D.;Xu, Chenxian;Bacchi, Samantha;Sharma, Vivek
• 通讯作者: Sharma, Vivek

Foam film stratification studies probe intermicellar interactions

• DOI: 10.1073/pnas.2024805118
• 发表时间: 2021-06
• 期刊: Proceedings of the National Academy of Sciences
• 作者: C. Ochoa;Shang Gao;Samanvaya Srivastava;Vivek Sharma

Spinodal stratification in ultrathin micellar foam films

超薄胶束泡沫薄膜中的旋节线分层

• DOI: 10.1039/c8me00102b
• 发表时间: 2019
• 期刊: Molecular Systems Design & Engineering
• 影响因子: 3.6
• 作者: Yilixiati, Subinuer;Wojcik, Ewelina;Zhang, Yiran;Sharma, Vivek
• 通讯作者: Sharma, Vivek