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

摘要提案编号：CTS-0553763主要研究者：McCarthy，Joseph J.附属机构： 爱丁堡大学提案标题： 大颗粒自组装（去组装）：使用Janus珠粒控制细颗粒的内聚混合/分离智力优点良好颗粒混合的主要障碍在于，即使在尺寸、密度等方面略有不同的颗粒也容易分离，或表现为“不混溶”材料，并且关于限制这种不混溶趋势知之甚少。这项工作的目的是解决控制的混合和分离的细颗粒，所提出的工作，使一个直接的类比处理不混溶的液体时，处理正弦颗粒系统。该项目将使用两亲性颗粒-有时称为“Janus珠”-作为干表面活性剂，以显着改善对细粉混合的控制。代替直接操纵二元粒子间力，如在L-系统中通过组织液的变化所做的那样，将使用介导二元相互作用以使其有利的添加剂组分。此外，与液-液萃取类似，也可以匡威：定制颗粒可用作萃取剂，分离通常易于混合的颗粒。开发一种经过测试和验证的内聚混合理论，用于预测间隙液体和表面力对粉末行为的影响;以及用于混合和分离的新型颗粒处理应用的潜在商业可行技术的可用性（分离）分别使用干表面活性剂和颗粒提取器。更广泛的影响这项工作的更广泛的影响在于加强基础设施，将教学与研究相结合，培养研究生（重点是代表性不足的群体）。在项目实施过程中，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的紧密联系-克拉克亚特兰大大学和摩根州立大学-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上可行的技术来控制颗粒加工行为来加强基础设施。

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.