Macroparticle Self-(de)Assembly: Using Janus Beads to Control Cohesive Mixing/Segregation of Fine Particles

建议编号：CTS-0553763主要研究员：McCarthy，Joseph J.从属关系：匹兹堡大学建议标题：大颗粒自(De)组装：使用Janus珠子控制细小颗粒的粘性混合/分离智力价值良好颗粒混合的主要障碍在于，即使在大小、密度等方面稍有不同的颗粒也容易分离，或表现为“不相容”的材料，关于限制这种不混合趋势，人们知之甚少。这项工作旨在解决控制细颗粒的混合和分离，拟议的工作直接类比于处理正弦颗粒体系时不相容液体的处理。该项目将使用两亲性颗粒--有时被称为“Janus珠子”--作为干燥表面活性剂，以显著改善对细粉混合的控制。不是像在L体系中那样，通过改变间隙流体来直接操纵二元粒子间力，而是使用一个附加成分来调节二元相互作用，以使其变得有利。此外，类似于液-液萃取，反之也是可能的：定制颗粒可用作萃取剂来分离通常倾向于混合的颗粒。该项目将导致引入新的两亲性颗粒生产方法；开发和验证适用于10-250-m定制颗粒的拉出力的光学表征技术；开发经测试和验证的内聚混合理论，以预测间隙液体和表面力对粉末行为的影响；这项工作的更广泛影响在于加强基础设施、整合教学和研究以及对研究生的培训(重点是对代表性不足的群体)。在项目过程中，将为一名全日制研究生提供培训。将尽一切努力从代表性不足的群体中招收学生。特别是，与两所HBCU--克拉克亚特兰大大学和摩根州立大学--的紧密联系将被用于招聘目的。拟议的工作将通过产生新的和潜在的商业可行的控制粒子处理行为的技术来加强基础设施。

ABSTRACTProposal Number: CTS-0553763Principal Investigator: McCarthy, Joseph J.Affiliation: University of PittsburghProposal Title: Macroparticle Self-(de)Assembly: Using Janus Beads to Control Cohesive Mixing/Segregation of Fine ParticlesIntellectual MeritThe primary hindrance to good particle mixing lies in the fact that particles that differ even slightly in size, density, etc. easily segregate, or behave as "immiscible" materials, and little is known regarding limiting this unmixing tendency. This work is aimed at addressing the control of mixing and segregation of fine particles, The proposed work makes a direct analogy to the handling of immiscible liquids when treating sine particle systems. The project will use amphiphilic particles - sometimes called "Janus beads" - as dry surfactants in order to dramatically improve control of the mixing of fine powders. Instead of manipulating the binary interparticle force directly, as is done in L-systems through changes in interstitial fluid, an additive component that mediates the binary interaction in order to make it favorable will be used. Moreover, in analogy to liquid-liquid extraction, the converse will also be possible: tailored particles may be used as extraction agents to separate particles that would normally tend to mix.The project will result in the introduction of novel amphiphilic particle production methods; the development and validation of optical characterization techniques for pull-off force applicable to tailored particles in the size range of 10-250-m; development of a tested and validated cohesive mixing theory for predicting the impact of interstitial liquid and surface forces on the behavior of powders; and availability of a potentially commercially viable technique for novel particle processing applications of mixing and segregation (separation) using dry surfactants and particle extractors, respectively.Broader Impacts The broader impacts of the work lie in enhancing infrastructure, integrating teaching and research, and training of graduate students (with emphasis on under-represented groups). During the course of the project training will be provided for one full-time graduate student. Every effort will be made to recruit students from underrepresented groups. In particular, strong ties to two HBCU's - Clark Atlanta University and Morgan State University - will be leveraged for recruiting purposes. The proposed work will enhance infrastructure through the generation of novel and potentially commercially viable techniques for controlling particle processing behavior.