Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council of Italy (CNR), Corso Stati Uniti 4, Padova, Italy.
Institute of Condensed Matter Chemistry and Technologies for Energy (ICMATE), National Research Council of Italy (CNR), Corso Stati Uniti 4, Padova, Italy.
J Colloid Interface Sci. 2018 Mar 15;514:528-533. doi: 10.1016/j.jcis.2017.12.058. Epub 2017 Dec 22.
In this work, powders of Single Wall Carbon Nanohorns (SWCNHs), a typical hydrophobic material, were oxidized with concentrated HNO with the aim of surface carboxylation and consequent improved hydrophilicity and dispersibility in polar solvents. Dynamic Light Scattering and ζ-potential measurements demonstrated that very stable colloidal suspensions of SWCNH in water were obtained in total absence of stabilizers. By properly optimizing the reaction parameters, the suspensions achieved stability even higher than colloids with similar composition but prepared with the use of surfactants. Surface damage and oxidation degree of SWCNHs were evaluated by SEM microscopy, Thermogravimetric Analysis, Residual Gas Analysis, XPS and UV-visible spectroscopy.
在这项工作中，使用浓 HNO 氧化单壁碳纳米角（SWCNHs）粉末，这是一种典型的疏水材料，旨在进行表面羧化，从而提高在极性溶剂中的亲水性和分散性。动态光散射和 ζ 电位测量表明，在完全没有稳定剂的情况下，SWCNH 在水中可获得非常稳定的胶体悬浮液。通过适当优化反应参数，即使不使用表面活性剂，悬浮液也可获得比具有类似组成的胶体更高的稳定性。通过 SEM 显微镜、热重分析、残余气体分析、XPS 和紫外可见光谱评估了 SWCNHs 的表面损伤和氧化程度。
