GOALI: Structure-Property-Processing Relationships of Concentrated Surfactant Solutions

该项目的目标是确定如何集中的表面活性剂为基础的解决方案是由常见的化学添加剂和制造工艺的影响。浓缩的表面活性剂溶液用于配制用于清洁、洗衣和其他个人护理的洗涤剂基产品。更好地理解溶液的结构-性能-加工关系将使工业能够更有效地制造浓缩溶液，以实现所需的性能和性能，同时还满足可持续发展目标，例如减少配制液体中的水。因此，该项目产生的新知识将最终导致减少与洗涤剂产品相关的经济和环境成本，并在与全球卫生有关的重要公共卫生措施方面取得相应的成果。该项目是普渡大学教师和学生与宝洁公司（PG）技术人员之间的合作，为普渡大学的研究生和本科生提供宝贵的工业经验和专业发展机会。除了研究活动，实验室模块和讲座演示将与PG合作创建，通过一种引人入胜的动手方法将表面活性剂溶液的物理模型与在线计算工具相结合，向工程专业的学生教授相图的基础知识。模型层状结构的表面活性剂溶液含有不同的添加剂将通过一系列的流变物理，散射和双折射实验，再加上流体动力学建模和中试规模的加工研究进行研究。 结果将帮助评估常见的配方添加剂和加工路线对表面活性剂溶液的多尺度结构和性质的影响，包括表面活性剂双层间距、厚度和弯曲模量。 除了研究常规的十二烷基硫酸盐表面活性剂外，研究小组还将研究一类微生物生物表面活性剂，这类表面活性剂更具可持续性和环保性。项目交付成果包括：（1）实验验证的本构模型，其将浓缩的层状结构的表面活性剂溶液的宏观尺度动力学与表面活性剂双层的纳米尺度和微米尺度特征相联系;以及（2）预测性处理图，以最终产生具有所需微观结构和最终使用性能的大规模浓缩的表面活性剂溶液。预计项目成果将与清洁和个人护理以外的各种领域相关，包括环境修复，表面活性剂制造和脂质疫苗开发。该项目将建立在20世纪90年代初对液晶表面活性剂流体的流动行为和剪切对流体微观结构的影响以及最近使用原位流变物理测量将功率连接的工作进行的基础实验研究的基础上。law剪切稀化流变学，在浓缩的表面活性剂溶液中令人惊讶地发生宏观壁滑移和活塞流。该奖项反映了NSF的法定使命，并已被认为是值得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的支持。

The goal of this project is to determine how concentrated surfactant-based solutions are affected by common chemical additives and manufacturing processes. Concentrated surfactant solutions are used to formulate detergent-based products for cleaning, laundry, and other personal care. A better understanding of the solution’s structure-property-processing relationships will enable industry to more efficiently manufacture concentrated solutions to achieve desired properties and performance while also meeting sustainability goals such as reducing water from formulated liquids. Thus, the new knowledge resulting from this project will ultimately lead to reduced economic and environmental costs associated with detergent-based products as well as corresponding gains in important public health measures related to global hygiene. This project is a collaboration between faculty and students at Purdue University and technical staff at The Procter and Gamble Company (P&G), providing the Purdue graduate and undergraduate students with valuable industrial experiences and professional development opportunities. In addition to the research activities, lab modules and lecture demos will be created in collaboration with P&G to teach the fundamentals of phase diagrams to engineering students through an engaging, hands-on approach coupling physical models of surfactant solutions with online computational tools. Model lamellar-structured surfactant solutions containing different additives will be investigated through a series of rheophysical, scattering, and birefringence experiments coupled with fluid dynamic modeling and pilot-scale processing studies. The results will hep evaluate the impact of common formulation additives and processing routes on the multiscale structures and properties of surfactant solutions, including surfactant bilayer spacing, thickness, and bending moduli. In addition to studying conventional dodecyl sulfate surfactants, the research team will also investigate a class of microbial biosurfactants, which are more sustainable and environmentally friendly. Project deliverables include: (1) experimentally validated constitutive models that connect macroscale dynamics of concentrated lamellar-structured surfactant solutions with nano- and micro-scale characteristics of surfactant bilayers; and (2) predictive processing maps to ultimately create concentrated surfactant solutions at scale with a desired microstructure and end-use performance. Project outcomes are expected to be relevant to a variety of areas beyond cleaning and personal care, including environmental remediation, surfactant manufacturing, and lipid-based vaccine development. This project will build upon fundamental experimental studies that were performed in the early 1990s on the flow behavior of liquid crystalline surfactant fluids and the impact of shear on the fluid’s microstructure as well as recent work that used in situ rheophysical measurements to connect power-law shear thinning rheology with the surprising occurrence of macroscale wall slip and plug flow in concentrated surfactant solutions.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.