Materials World Network: Study of Macromolecular Ferrofluids

材料世界网：高分子铁磁流体的研究

• 批准号: 0602932
• 负责人: Judy Riffle
• 金额: --
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-15 至 2009-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0602932&HistoricalAwards=false
• 关键词: Materials; World; Network; Study; Macromolecular

The Materials World Network for the Study of Macromolecular Ferrofluids brings together an international team of chemists, physicists and engineers to address the design, synthesis and properties of nanostructured polydimethylsiloxane (PDMS) ferrofluids, and to investigate control over the magnetophoretic mobility of their droplets in hydrophilic, immiscible, viscous media. The team includes J. S. Riffle and R. M. Davis, Depts. of Chemistry and Chemical Engineering, VA Tech, Blacksburg, VA, USA and T. G. St. Pierre and R. C. Woodward, School of Physics, and M. A. Saunders, Center for Microscopy and Microanalysis, the University of Western Australia, Perth, AU.The ultimate goals are to employ gradient magnetic fields to maneuver hydrophobic magnetic droplets through aqueous media, and to apply forces with the droplets. The motion and behavior of ferrofluid droplets in an immiscible viscous medium under the influence of magnetic field gradients are complex. To obtain optimal response to applied magnetic fields and field gradients requires optimal design of ferrofluid viscosity, surface tension, magnetic susceptibility, and droplet size. These parameters are determined by the molecular compositions, nanoparticle sizes, dispersant and carrier molecular weights, dispersion characteristics within the droplets with and without a magnetic field, interfacial tension between the fluid and the medium, and the complex fluid properties. Well-defined PDMS-magnetite nanoparticle complexes will be prepared and dispersed in PDMS carriers, with and without the aid of special block copolymer surfactants, to understand their structure-property relationships. One potential application is the use of biocompatible PDMS ferrofluids for applying a magnetic force from inside the eye on a detached retina to press it into place against the underlying choroid, and also to close a hole in the retina. There are also other potential applications of nanostructured ferrofluids in biotechnology such as magnetic field-directed drug carriers, fluids for remote treatment of arterial aneurysms, or liquid ball valves for temporarily closing nanometer to micron size openings. The outcomes of the research are also expected to have potential as ferrofluid-based actuators, electromagnetic micropumps, and fluid based valves and sealing systems. Graduate and undergraduate students will be trained with the teamwork skills and the creativity for tackling complex multi-disciplinary research problems in a global setting. This award is co-funded by the East Asia Pacific Program of the Office of International Science and Engineering.

大分子铁磁流体研究材料世界网络汇集了一个由化学家、物理学家和工程师组成的国际团队，研究纳米结构聚二甲基硅氧烷（PDMS）铁磁流体的设计、合成和性能，并研究其液滴在亲水、不混溶、粘性介质中的磁电泳迁移率控制。该团队包括J. S. Riffle和R. M. Davis。t.g. St. Pierre和r.c. Woodward，物理学院，以及m.a. Saunders，显微镜和微量分析中心，西澳大利亚大学，珀斯，澳大利亚。最终目标是利用梯度磁场来操纵疏水磁滴通过水介质，并对磁滴施加力。磁场梯度影响下铁磁流体液滴在非混相粘性介质中的运动和行为是复杂的。为了获得对外加磁场和场梯度的最佳响应，需要对铁磁流体粘度、表面张力、磁化率和液滴尺寸进行优化设计。这些参数是由分子组成、纳米颗粒大小、分散剂和载体分子量、有和没有磁场时液滴内的分散特性、流体与介质之间的界面张力以及复杂流体性质决定的。在有或没有特殊嵌段共聚物表面活性剂的帮助下，将制备和分散在PDMS载体中定义良好的PDMS-磁铁矿纳米颗粒复合物，以了解它们的结构-性能关系。一种潜在的应用是使用生物相容性的PDMS铁磁流体，从眼睛内部对分离的视网膜施加磁力，使其紧贴底层脉络膜，并关闭视网膜上的一个洞。纳米结构铁磁流体在生物技术方面还有其他潜在的应用，如磁场定向药物载体、用于动脉动脉瘤远程治疗的液体，或用于暂时关闭纳米到微米尺寸开口的液体球阀。这项研究的结果也有望在基于铁磁流体的执行器、电磁微泵、基于流体的阀门和密封系统中具有潜力。研究生和本科生将接受团队合作技能和创造力的培训，以应对全球环境下复杂的多学科研究问题。该奖项由国际科学与工程办公室东亚太平洋项目共同资助。