Self-assembly of carbon nanotubes modified by hydropropyl cellulose in aqueous solution
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摘要: 羟丙基纤维素（HPC）通过物理吸附包覆到多壁碳纳米管（MWCNTs）的表面，得到HPCMWCNTs。HPC是一种水溶性纤维素，可显著地提高MWCNTs与水的相亲性。通过比较修饰前后碳纳米管的水接触角及其在水中的分散性，证明HPC已成功地吸附到MWCNTs的表面。动态稳定性测试表明分散体系并非真正稳定，随着时间变化，HPCMWCNTs自组装成束状并沉降到容器底部。透射电子显微镜和扫描电子显微镜显示MWCNTs在自组装体内取向、平行排列。自组装体有整齐的头部和相对松散的尾部，这些圆柱状聚集体的径向尺寸为4~8μm，轴向尺寸为25~35μm。修饰过的MWCNTs由亲水的HPC和憎水的MWCNTs组成，在亲水/疏水的相互作用下，两亲性的HPCMWCNTs在水中形成了“相互垂直的微相分离”，从而导致改性MWCNTs有规则的自组装。Abstract: Hydropropylcellulose (HPC)-modified multi-wall carbon nanotubes (HPC-MWCNTs) were prepared by physical adsorption of HPC on the surface of MWCNTs. The modification decreased the contact angle of water on HPC-MWCNTs and increased their water dispersion ability. However, HPC-MWCNTs dispersed in water were not stable and precipitated on the bottom of the container after 2 days as cylindrical bundles with a diameter of 4-8μm and a length of 25-35μm. The cylindrical bundles were formed by self-assembly of HPC-MWCNTs by hydrophilic and hydrophobic interactions.Hydropropylcellulose (HPC)-modified multi-wall carbon nanotubes (HPC-MWCNTs) were prepared by physical adsorption of HPC on the surface of MWCNTs. The modification decreased the contact angle of water on HPC-MWCNTs and increased their water dispersion ability. However, HPC-MWCNTs dispersed in water were not stable and precipitated on the bottom of the container after 2 days as cylindrical bundles with a diameter of 4-8μm and a length of 25-35μm. The cylindrical bundles were formed by self-assembly of HPC-MWCNTs by hydrophilic and hydrophobic interactions.
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Key words:
- Carbon nanotubes /
- Hydroxypropyl cellulose /
- Self-assembly
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