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    李博妍, 公维光, 景希玮, 郑柏存. 磁性金属离子对羧甲基纤维素钠分散碳纳米管浆料性能的影响[J]. 华东理工大学学报(自然科学版). DOI: 10.14135/j.cnki.1006-3080.20200614001
    引用本文: 李博妍, 公维光, 景希玮, 郑柏存. 磁性金属离子对羧甲基纤维素钠分散碳纳米管浆料性能的影响[J]. 华东理工大学学报(自然科学版). DOI: 10.14135/j.cnki.1006-3080.20200614001
    LI Boyan, GONG Weiguang, JING Xiwei, ZHENG Baicun. Effect of Magnetic Metal Ions on Properties of Carbon Nanotube Slurry Dispersed by Sodium Carboxymethylcellulose[J]. Journal of East China University of Science and Technology. DOI: 10.14135/j.cnki.1006-3080.20200614001
    Citation: LI Boyan, GONG Weiguang, JING Xiwei, ZHENG Baicun. Effect of Magnetic Metal Ions on Properties of Carbon Nanotube Slurry Dispersed by Sodium Carboxymethylcellulose[J]. Journal of East China University of Science and Technology. DOI: 10.14135/j.cnki.1006-3080.20200614001

    磁性金属离子对羧甲基纤维素钠分散碳纳米管浆料性能的影响

    Effect of Magnetic Metal Ions on Properties of Carbon Nanotube Slurry Dispersed by Sodium Carboxymethylcellulose

    • 摘要: 多壁碳纳米管(MWNTs)制备过程中残留的磁性金属催化剂可能对其在溶剂中的分散产生影响。本文通过将MWNTs分别分散到含有同一浓度金属离子(Fe3+,Fe2+,Ni2+,Co2+)的羧甲基纤维素钠(CMC)溶液中,制备了一系列MWNTs浆料。并系统性地探究了浆料的吸附量、拉曼光谱、zeta电位和吸附构象。结果表明,CMC/MWNTs浆料的分散稳定性按照Fe2+、Co2+、Ni2+、Fe3+的顺序依次降低。CMC在MWNTs表面的吸附量与吸附构象受CMC与金属离子之间螯合反应的控制,这决定了CMC/MWNTs体系的分散和稳定性。含有二价离子的浆料中,CMC能够形成一层均匀的膜,覆盖在MWNTs表面,CMC吸附量最大,MWNTs表面zeta电位最大,表现出较好的分散稳定性。

       

      Abstract: A detailed study of the dispersion, rheological and adsorption behaviors between multi-walled carbon nanotubes (MWNTs) and sodium carboxymethylcellulose (CMC) at different metal ions solutions were presented. The experimental results suggested that the chelation between metal ions and CMC governed the adsorption amount and adsorption conformation of CMC onto MWNTs, which had a great influence on the dispersion stability of MWNTs slurries. The MWNTs slurry with Fe2+ had smaller average size, lower viscosity and better stability, which led the slurry to evolving from shear-thinning fluid. It can be seen form UV adsorption experiment that the chelation between Fe3+ and CMC was stronger than that of other divalent ion. And the chelation increased with the increase of the radius of the divalent ion. Raman and Thermo-gravimetry (TGA) results showed that the adsorption amount of Fe3+ was lower, which provided a lower electrostatic repulsive force. In the slurry with divalent ions, adsorption amount of CMC onto MWNTs were higher in the order of Ni2+, Co2+ and Fe2+, providing higher repulsive force, larger zeta potential on MWNTs surface. That’s the reason why Fe2+ had better dispersion stability. The microstructures were measured by TEM. It was found that uniform CMC adsorption layers were formed on the surface of MWNTs with divalent ions. However, for the MWNTs with Fe3+, MWNTs were wrapped by CMC agglomerates, resulting in poor dispersion stability.

       

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