用于探测纳升液滴和薄膜流变性的磁旋转光谱
Magnetic rotational spectroscopy for probing rheology of nanoliter droplets and thin films
摘要：
微量复杂流体的原位表征是一个挑战。磁旋转光谱（MRS）与亚微米探针提供了灵活性和准确性，提供所需的空间和时间分辨率表征纳升液滴和薄膜时，其他方法不足。磁共振波谱分析了磁探头在外部旋转磁场作用下，其磁矩旋转一周时，磁探头平面内旋转的特征。探头显示出可区分的运动，随着驱动磁场的旋转频率的变化，该运动从旋转变为翻滚再变为颤抖。在实践中，MRS已被用于分析薄聚合物膜，陶瓷前体和昆虫生物流体的纳升液滴的凝胶化。MRS是一个年轻的领域，但它有许多潜在的应用需要流变特性的几乎没有可用的，化学反应复杂的流体。
英文摘要：
In-situ characterization of minute amounts of complex fluids is a challenge. Magnetic Rotational Spectroscopy (MRS) with submicron probes offers flexibility and accuracy providing desired spatial and temporal resolution in characterization of nanoliter droplets and thin films when other methods fall short. MRS analyzes distinct features of the in-plane rotation of a magnetic probe, when its magnetic moment makes full revolution following an external rotating magnetic field. The probe demonstrates a distinguishable movement which changes from rotation to tumbling to trembling as the frequency of rotation of the driving magnetic field changes. In practice, MRS has been used in analysis of gelation of thin polymer films, ceramic precursors, and nanoliter droplets of insect biofluids. MRS is a young field, but it has many potential applications requiring rheological characterization of scarcely available, chemically reacting complex fluids.
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