Magnetoviscosity of nanorod ferrofluids synthesized by virus templating

提出了一项为期两年的研究计划，通过病毒盘辅助合成铁磁性纳米线和纳米管来制备新型纳米棒磁流体。如果我们目前对磁流体中磁场诱导的粘度增强的理解是正确的，那么棒状铁磁纳米颗粒应该能够显著改善对困扰传统磁流体的剪切变稀的稳定性，这表明纳米棒状磁流体将非常适合用于自适应减振系统或任何其他受益于通过液体的力传递的应用。本项目的主要目标是(1)从植物或酵母培养物中制备大量高度稳定的非致病烟草花叶病毒(TMV)；(2)将TMV用作生长长宽比可控的铁磁纳米线和纳米管的生物模板；(3)将纳米棒悬浮在合适的载体流体中并表征所产生的磁流体的磁性；(4)测量纳米棒磁流体的频率依赖复数粘度，并将其与传统铁液进行比较；(5)测试理论模型对粘度随悬浮铁磁颗粒长宽比变化的预测。

A two-year research project is proposed to prepare novel nanorod ferrofluids by virustemplate- assisted synthesis of ferromagnetic nanowires and nanotubes. If our current understanding of the magnetic-field-induced viscosity enhancement in ferrofluids is correct, then rod-shaped ferromagnetic nanoparticles should impart a dramatically improved stability against the shear thinning that plagues conventional ferrofluids, suggesting that nanorod ferrofluids would be ideal for usage in adaptive damping systems or in any other application benefiting from force transfer via liquids. The primary goals of this project are (1) to prepare large amounts of the highly stable, non-pathogenic tobacco mosaic virus (TMV) from plants or yeast cultures; (2) to employ TMV as a biotemplate for the growth of ferromagnetic nanowires and nanotubes of controlled aspect ratio; (3) to suspend the nanorods in a suitable carrier fluid and characterize the magnetic properties of the resulting ferrofluid; (4) to measure the frequency-dependent complex viscosity of nanorod ferrofluids and compare it to that of conventional ferrofluids; and (5) to test the predictions of theoretical models for the viscosity enhancement as a function of the aspect ratio of suspended ferromagnetic particles.