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arXiv 1209.5250cond-mat.softcond-mat.mes-hallphysics.ins-det
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一种新型音叉式纳米约束液体振荡剪切流变仪

A new tuning fork-based instrument for oscillatory shear rheology of nano-confined liquids

Karan Kapoor, Vinod Kanawade, Vibham Shukla, Shivprasad Patil

摘要:

我们提出了一种新的方法来测量液体的流变响应被限制到纳米尺度表现出相当大的减慢相比,散装液体的动力学。该方法依赖于使用鲁棒的力传感器,该力传感器具有测量1至10 nN范围内的剪切力的灵敏度和55000 N/m的刚度以避免热噪声。非共振操作确保了剪切频率范围的应用。该范围高于系统的机械弛豫时间的倒数,并且允许测量由于在约束时动力学的显著"减慢"而出现的非线性效应。该仪器是朝着解决有关纳米约束液体性质的争议迈出的一步。

英文摘要:

We present a new method to measure rheological response of liquids confined to nano-scale which exhibit a considerable slow-down in dynamics compared to bulk liquids. The method relies on using a robust force sensor that has a sensitivity to measure shear forces in the range of 1 to 10 nN and a stiffness of 55000 N/m to avoid thermal noise. Off-resonance operation ensures application of a range of shear frequencies . This range is higher than the inverse of the system's mechanical relaxation time and allows the measurement of non-linear effects emerging due to significant "slow down" in dynamics upon confinement. The instrument is a step forward towards resolving the controversies about the nature of nano-confined liquids.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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