GOALI: Large-Scale Structures in Colloids with Moderate-Range Attractions

GOALI：具有中等范围吸引力的胶体中的大型结构

• 批准号: 0853551
• 负责人: Surita Bhatia
• 金额: $ 31.08万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0853551&HistoricalAwards=false
• 关键词: GOALI; Large; Scale; Structures; Colloids

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).0853551BhatiaColloidal particles with attractive interparticle potentials are important from both a fundamental and applications standpoint. Much of the research to date has focused on colloids with short-range attractions, which may form either attractive colloidal glasses or networked gels. However, recent studies have shown that a new phase containing stable dense clusters of particles may be formed in systems with moderate-range attractions. These exciting results underscore the importance of the range of attraction as an additional parameter to explore in determining the phase behavior of attractive colloids. In this GOALI project, we will develop a fundamental understanding of how the range of attractive interactions impacts large-scale structure in colloidal dispersions, including aggregation and formation of finite sized clusters, and apply this knowledge to develop improved toner formulations. We confine ourselves to systems in which the attractions arise from bridging chains and in which the particle polymer size ratio is O(1). Our study distinguishes itself from previous work in that we will both quantify the interparticle potential using small angle scattering and explore structure using scattering and imaging techniques. The main objectives of the proposal are to: 1. Develop a model system where the range of attraction can be tuned, and characterize the interparticle potential using small angle neutron scattering; 2. Probe large scale structure and aggregation in systems at rest using ultra-small angle neutron scattering (USANS), dynamic light scattering, confocal microscopy, and TEM; 3. Investigate the effect of shear on cluster morphology and rheology; and 4. Test the extensibility of our findings to industrially relevant systems, through graduate student internships and industrial interactions provided by researchers at Xerox Corporation. Xerox Corporation is interested in applications of colloidal aggregation to toner production and will serve as the industrial partner for this GOALI. Inclusion of Xerox as a partner will add value by facilitating transfer of the research results into an industrially relevant technology and by broadening the training experiences of graduate and undergraduate students involved in the project. Xerox personnel will actively participate by providing comments and suggestions at regular research team meetings, by arranging student internships to evaluate the applicability of the research to toner production, by providing funds in support of portions of the work, and by participating in an industrial short course.

该奖项是根据2009年的《美国回收与再投资法》（公法111-5）进行资助的。0853551bhatiacolloid颗粒具有有吸引力的颗粒域潜力的颗粒，从基本和应用的角度来看，都很重要。迄今为止，许多研究都集中在具有短距离景点的胶体上，这些胶体可能形成有吸引力的胶体眼镜或网络凝胶。然而，最近的研究表明，在具有中等范围的吸引力的系统中，可能形成一个含有稳定密集颗粒簇的新阶段。这些令人兴奋的结果强调了吸引范围作为在确定有吸引力胶体的相行为时探索的附加参数的重要性。在这个目标项目中，我们将对有吸引力的相互作用范围如何影响胶体分散体中的大规模结构（包括聚集和形成有限大小的簇）的基本了解，并应用此知识来开发改进的碳粉配方。我们将自己局限于由桥接链引起的景点，其中颗粒聚合物大小比为O（1）。我们的研究与以前的工作区分开来，我们既可以使用较小的角度散射来量化颗粒势，又将使用散射和成像技术探索结构。该提案的主要目标是：1。开发一个模型系统，可以调节吸引范围，并使用小角度中子散射来表征颗粒域电位； 2。使用超小角度的中子散射（usans），动态光散射，共聚焦显微镜和TEM探针在静止系统中的大规模结构和聚集； 3。研究剪切对簇形态和流变学的影响；和4。通过研究人员实习和施乐公司研究人员提供的研究生实习和工业互动来测试我们对工业相关系统的可扩展性。施乐公司对胶体聚集到碳粉生产的应用感兴趣，并将作为该目标的工业合作伙伴。包括施乐作为合作伙伴将通过促进研究结果转移到工业相关的技术，并扩大参与该项目的研究生和本科生的培训经验，从而增加价值。施乐人员将通过在常规研究团队会议上提供评论和建议来积极参与，并安排学生实习，以评估研究对碳粉生产的适用性，通过提供资金来支持部分工作，并参加工业短期课程。