Dispersion of carbon nanotubes in ethanol by a bead milling process
Dispersion of carbon nanotubes in ethanol by a bead milling process
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DOI：
10.1016/j.carbon.2011.05.033
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发表时间：
2011-11
期刊：
影响因子：
10.9
通讯作者：
S. Yoshio;Junichi Tatami;T. Yamakawa;T. Wakihara;K. Komeya;T. Meguro;K. Aramaki;K. Yasuda
中科院分区：
文献类型：
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作者：
S. Yoshio;Junichi Tatami;T. Yamakawa;T. Wakihara;K. Komeya;T. Meguro;K. Aramaki;K. Yasuda
通过珠磨将碳纳米管（CNT）分散在乙醇中以形成CNT悬浮液。珠磨后，碳纳米管的尺寸和形状没有改变。通过光学显微镜观察到碳纳米管的布朗运动。通过对单个碳纳米管的轨迹分析，表明其平移布朗运动的扩散系数为4.5×10−13m2s−1。由于漂移流和扩散流导致的颗粒迁移率的比率为2.4，这与高分子量蛋白质几乎相同。在CNT悬浮液中发生剪切稀化，这意味着CNT在低粘度下在高剪切速率下在悬浮液中取向。剪切速率为0和∞时的特性粘度分别与Simha方程和Leal和Hinch方程计算的特性粘度一致。根据实验结果，碳纳米管被发现是很好地分散在悬浮液中的孤立和纳米级的棒状颗粒。利用该CNT悬浮液制备了CNT分散的Si3N4陶瓷。结果表明，与湿法球磨相比，球磨可以消除CNT颗粒，提高CNT Si3N4陶瓷的弯曲强度。
Carbon nanotubes (CNTs) were dispersed in ethanol by bead milling to form a CNT suspension. The size and shape of the CNTs were not changed after bead milling. The Brownian motion of the CNTs was observed by an optical microscope. It was shown by analysis off the trajectory of individual CNTs that the diffusion coefficient of their translational Brownian motion was 4.5×10−13m2s−1. The ratio of the particle mobilities due to drift flow and diffusion flow was 2.4, which is almost the same as for a high-molecular-weight protein. Shear thinning occurred in the CNT suspension, which means that the CNTs were oriented in the suspension under a high shear rate at low viscosity. The intrinsic viscosity for shear rates of 0 and ∞ agreed with those calculated using Simha’s equation and Leal and Hinch’s equation, respectively. Based on the experimental results, the CNTs were found to be well dispersed as isolated and nanosized rod-like particles in the suspension. CNT-dispersed Si3N4ceramics were fabricated using the CNT suspensions. As a result, the bead milling improved the bend strength of the CNT Si3N4ceramics compared with the wet ball milling because granules of CNTs were eliminated by the bead milling.