Dipartimento di Chimica, Università degli Studi "Aldo Moro", via Orabona 4, Bari 70126, Italy; Consorzio INSTM, UdR Bari, Italy.
CNR-NANOTEC, Istituto di Nanotecnologia, URT Bari c/o Dipartimento di Chimica, via Orabona 4, Bari 70126, Italy; Consorzio INSTM, UdR Bari, Italy.
J Colloid Interface Sci. 2017 Apr 1;491:255-264. doi: 10.1016/j.jcis.2016.12.039. Epub 2016 Dec 19.
In order to improve the dispersion of multi-walled carbon nanotubes (MWCNTs) in aqueous media, their surface functionalization was carried out in O-fed low-pressure plasmas. Differently from what can be found in the literature of this field, homogeneous functionalization was achieved by generating the plasma inside vials containing the nanotube powders properly stirred. Experimental parameters, such as input power, treatment time and pressure, were varied to investigate their influence on the process efficiency. A detailed characterization of the plasma treated nanotubes, dry and in aqueous suspension, was carried out with a multi-diagnostic analytical approach, to evaluate their surface chemical properties, morphology, structural integrity and stability in the colloidal state. The plasma grafting of polar ionizable (e.g. acid) groups has been proved to successfully limit the agglomeration of MWCNTs and to produce nanotubes suspensions that are stable for one month and more in water.
为了提高多壁碳纳米管（MWCNTs）在水介质中的分散性，对其进行了氧进料低压等离子体表面功能化处理。与该领域文献中的情况不同，通过在适当搅拌的含有纳米管粉末的小瓶内产生等离子体，实现了均匀的功能化。实验参数，如输入功率、处理时间和压力，进行了变化，以研究它们对过程效率的影响。采用多诊断分析方法对等离子体处理后的纳米管（干燥和水悬浮液）进行了详细的表征，以评估其表面化学性质、形态、结构完整性和胶体状态下的稳定性。已经证明，极性可电离（例如酸）基团的等离子体接枝成功地限制了 MWCNTs 的团聚，并产生了在水中稳定一个月以上的纳米管悬浮液。
