Transient flow responses of carbon nanotubes suspensions after a shear reversal
Transient flow responses of carbon nanotubes suspensions after a shear reversal
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DOI：
10.1299/transjsme.14-00625
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
S. Sato;T. Narumi;A. Ushida
中科院分区：
文献类型：
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作者：
S. Sato;T. Narumi;A. Ushida
在这项研究中，我们研究了碳纳米管（CNT）悬浮液与牛顿载体液体在应力扫描试验中的剪切流动逆转后的流动性响应。悬浮液显示出粘度的瞬时降低，即，流动性增加后，在剪切方向上的流动逆转。此外，在一定的剪切速率下观察到粘度的瞬时剪切增稠现象。为了定量地阐明粘度恢复，估计了对应于粘度恢复峰值的典型应变Δ Δ P。从应力扫描率的独立性，分别悬浮液中示出。此外，载液的粘度和CNT的体积分数的依赖性也被检查。结果表明，轻载液和高体积分数可获得较低的渗透压。据认为，这些结果将与取决于所施加的剪切速率的CNT的流动结构的变化相关。
In this study, we have investigated the fluidity responses after a shear flow reversal of carbon nanotube (CNT) suspensions with Newtonian carrier liquids in stress-sweep tests. The suspensions have showed transient decrease in viscosity, i.e., increase in fluidity, after the flow reversal in shearing direction. Moreover, i.e. transient shear thickening phenomena, in viscosity were observed at a certain shear rate. In order to quantitatively clarify the viscosity recovery, a typical strain p corresponding to the peak of viscosity recovery was estimated. Independence of p from stress sweep-rates applied was shown for respective suspensions. Moreover, dependence of viscosity of the carrier liquid and volume fraction of CNT was also examined. I n the result, it is clarified that lower p was obtained with light carrier liquids and high volume fraction. It is considered that these results will be correlated to the change in flowing structure of CNTs depending on the shear rate applied.