Surfactant Assisted Dispersion and Adhesion Behavior of Carbon Nanotubes on Cu—Zr and Cu—Zr—Al Amorphous Powders
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第9期
论文作者：Jonathan Nguyen Haiming Wen Zhihui Zhang Frank Yaghmaie Enrique Lavernia
文章页码：847 - 853
摘 要：Carbon nanotubes（CNTs）were dispersed in gas atomized Cu47.5Zr47.5Al5（CZA）and Cu50Zr50（CZ）amorphous powders,in an effort to elucidate the mechanisms of adhesion of CNTs onto amorphous metallic powders.CNTs were homogenously dispersed in water using a zwitterionic（ZW）surfactant.Then CZA and CZ powders were submersed in the ZW-CNT suspensions with varying amounts of dwell time in an ultrasonic bath.The ZW-CNTmetal powder suspensions were dried,and CNT-metal composite powders were obtained after decomposition of the surfactant by calcination.Zeta potential measurements on ZW-CNT-metal powder suspensions and scanning electron microscopy investigation into the CNT-metal composite powders both indicated an ideal dwell time,for a specific alloy composition,of metallic powders in ZW-CNT suspension to achieve optimal adhesion of CNTs onto amorphous metallic powder surfaces.The results are rationalized on the basis of hydrolysis of metal ions into suspension creating a net positive charge on the metallic powder surfaces,and the interaction between the charged powder surfaces and the charged hydrophilic head groups of ZW,which has the other end attached to CNTs.
Jonathan Nguyen1，Haiming Wen1，Zhihui Zhang1，Frank Yaghmaie2，Enrique Lavernia1
1. Department of Chemical Engineering and Materials Science, University of California at Davis,Davis, CA 95616, USA2. Northern California Nanotechnology Center, University of California at Davis,Davis, CA 95616, USA
摘 要：Carbon nanotubes（CNTs）were dispersed in gas atomized Cu47.5Zr47.5Al5（CZA）and Cu50Zr50（CZ）amorphous powders,in an effort to elucidate the mechanisms of adhesion of CNTs onto amorphous metallic powders.CNTs were homogenously dispersed in water using a zwitterionic（ZW）surfactant.Then CZA and CZ powders were submersed in the ZW-CNT suspensions with varying amounts of dwell time in an ultrasonic bath.The ZW-CNTmetal powder suspensions were dried,and CNT-metal composite powders were obtained after decomposition of the surfactant by calcination.Zeta potential measurements on ZW-CNT-metal powder suspensions and scanning electron microscopy investigation into the CNT-metal composite powders both indicated an ideal dwell time,for a specific alloy composition,of metallic powders in ZW-CNT suspension to achieve optimal adhesion of CNTs onto amorphous metallic powder surfaces.The results are rationalized on the basis of hydrolysis of metal ions into suspension creating a net positive charge on the metallic powder surfaces,and the interaction between the charged powder surfaces and the charged hydrophilic head groups of ZW,which has the other end attached to CNTs.
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