GOALI: Determination of the Structure and Properties of Microfibrillated Cellulose during Dynamic Phase Transitions

目标：动态相变期间微原纤化纤维素的结构和性能的测定

• 批准号: 1933251
• 负责人: Kelly Schultz
• 金额: $ 30.64万
• 依托单位: Lehigh University
• 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=1933251&HistoricalAwards=false
• 关键词: GOALI; Determination; Structure; Properties; Microfibrillated

Microfibrillated cellulose (MFC) is a waste product generated during paper manufacturing. It is processed commercially for some industrial uses, but it also has a potential application as a rheological modifier in consumer, fabric and home care products. Rheological modifiers are materials added to certain products to customize their flow behavior. MFC is non-ionic, which makes it compatible with a wide range of product recipes, but it must be dispersed throughout a product to modify the product's properties. The challenge is that MFC is supplied as a concentrated slurry of highly entangled fibers in water that are difficult to disperse in most products. This GOALI project, which is a collaboration between Lehigh University and Procter and Gamble, will investigate how the structure of MFC depends on parameters such as the temperature, composition of the host solution and forces exerted on MFC due to flow. Using several techniques that probe the microstructural arrangements of the MFC fibers, the researchers explore transitions in the microstructure that can enhance dispersal of MFC in useful products. Repurposing MFC waste from the paper industry as additives for consumer products will reduce the need for MFC disposal and reduce manufacturing costs of valuable consumer products. The research team will engage in a variety of outreach activities, including programs at the Da Vinci Science Center to educate the public in colloids and rheology, mentoring middle school and high school students interested in STEM fields, and training undergraduate and graduate students in research.The overall goal of this GOALI project is to characterize the spatial and temporal rheological evolution of an MFC scaffold to enable its use as a rheological modifier for consumer, fabric and home care products. MFC has a fiber size that is comparable to the fiber size of rheological modifiers in current use, but unlike other modifiers, MFC has negligible charge on the colloid. The potential advantages of MFC will be explored by characterizing the microstructural evolution of MFC using microrheology and microscopy, by characterizing the evolution of bulk rheology of MFC systems, and by determining equilibrium properties and scaffold structure after phase transitions using a unique microfluidic platform and multiple particle tracking microrheology. MFC solutions will be characterized during phase transitions due to three driving forces: temperature, changes in the surrounding solution and flow-induced mechanical forces. This knowledge will enable the use of these materials as rheological modifiers for the formulated product industry. The results of the research will identify materials that lead to homogeneous MFC suspensions and determine the microstructure and macroscopic structure and properties that lead to stable suspensions.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.

微纤纤维素（MFC）是在纸制造过程中产生的废物。 它是在商业上用于某些工业用途的商业处理，但它在消费者，面料和家庭护理产品中也具有潜在的应用。 流变修饰符是添加到某些产品中以自定义其流动行为的材料。 MFC是非离子的，它使其与广泛的产品食谱兼容，但是必须将其分散在产品中以修改产品的性质。 面临的挑战是，MFC被作为在水中很难分散在大多数产品中的高度纠缠纤维的集中浆液。 这个守门员项目是Lehigh University与Procter and Gamble之间的合作，将研究MFC的结构如何取决于参数，例如温度，宿主解决方案的组成以及由于流动引起的MFC的力。 研究人员使用几种探测MFC纤维的微观结构排列的技术，探索了微观结构中可以增强MFC在有用产品中扩散的过渡。 将造纸行业的MFC废物重新利用为消费产品的添加剂将减少对MFC处置的需求，并降低有价值的消费产品的制造成本。 The research team will engage in a variety of outreach activities, including programs at the Da Vinci Science Center to educate the public in colloids and rheology, mentoring middle school and high school students interested in STEM fields, and training undergraduate and graduate students in research.The overall goal of this GOALI project is to characterize the spatial and temporal rheological evolution of an MFC scaffold to enable its use as a rheological modifier for consumer, fabric and home care 产品。 MFC的纤维尺寸与当前使用中流变学修饰符的纤维尺寸相当，但是与其他修饰符不同，MFC对胶体的电荷可忽略不计。通过使用微流变学和显微镜表征MFC的微观结构演化，通过表征MFC系统的大量流变学的演变，以及通过使用相变之后的平衡性能和脚克结构，使用相变之后的平衡性能和脚克结构，使用相变之后，使用相变的相变，则可以探索MFC的潜在优势。 由于三个驱动力，将在相变时表征MFC溶液：温度，周围溶液的变化和流动诱导的机械力。这些知识将使这些材料用作制定产品行业的流变修饰符。该研究的结果将确定导致MFC悬浮液的材料，并确定导致稳定悬架的微观结构和宏观结构和特性。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来通过评估来通过评估来支持的。

项目成果

Rheological properties of phase transitions in polydisperse and monodisperse colloidal rod systems

• DOI: 10.1002/aic.17401
• 发表时间: 2021-08-25
• 期刊: AICHE JOURNAL
• 影响因子: 3.7
• 作者: He, Shiqin;Pascucci, Dominic R.;Schultz, Kelly M.
• 通讯作者: Schultz, Kelly M.