Multicomponent Solubility Parameters for Single-Walled Carbon Nanotube-Solvent Mixtures
Multicomponent Solubility Parameters for Single-Walled Carbon Nanotube-Solvent Mixtures
复制标题
DOI：
10.1021/nn900493u
复制
发表时间：
2009-08-01
期刊：
影响因子：
17.1
通讯作者：
Coleman, Jonathan N.
中科院分区：
文献类型：
--
作者：
Bergin, Shane D.;Sun, Zhenyu;Coleman, Jonathan N.
我们已经测量了单壁碳纳米管在一系列溶剂中的溶解度，观察值高达3.5 mg/mL。通过绘制纳米管的溶解度作为溶剂的汉森溶解度参数的函数，我们已经证实，成功的溶剂占据了明确定义的范围内的汉森参数空间。与极性或氢键汉森参数相比，色散汉森参数更敏感。我们估计纳米管的色散、极性和氢键汉森参数分别为= 17.8 MPa 1/2、= 7.5 MPa 1/2和= 7.6 MPa 1/2。我们发现纳米管在良溶剂中的溶解度随溶剂到纳米管溶解度参数在汉森空间中的距离而平滑衰减。最后，我们提出Hildebrand和汉森溶解度参数都不是纳米管-溶剂相互作用的基本量。我们表明，先前计算的纳米管Hildebrand参数对纳米管直径的依赖性可以通过导出基于纳米管表面能的简单表达式来再现。我们表明，基于表面能的溶解度参数得到等效的结果汉森溶解度参数。然而，我们注意到，相反的溶解度理论，一些非溶剂的纳米管的汉森和表面能溶解度参数类似的纳米管计算。溶剂和非溶剂之间的区别本质还有待充分理解。
We have measured the dispersibility of single-walled carbon nanotubes in a range of solvents, observing values as high as 3.5 mg/mL. By plotting the nanotube dispersibility as a function of the Hansen solubility parameters of the solvents, we have confirmed that successful solvents occupy a well-defined range of Hansen parameter space. The level of dispersibility is more sensitive to the dispersive Hansen parameter than the polar or H-bonding Hansen parameter. We estimate the dispersion, polar, and hydrogen bonding Hansen parameter for the nanotubes to be = 17.8 MPa1/2, = 7.5 MPa1/2, and = 7.6 MPa1/2. We find that the nanotube dispersibility in good solvents decays smoothly with the distance in Hansen space from solvent to nanotube solubility parameters, Finally, we propose that neither Hildebrand nor Hansen solubility parameters are fundamental quantities when it comes to nanotube-solvent interactions. We show that the previously calculated dependence of nanotube Hildebrand parameter on nanotube diameter can be reproduced by deriving a simple expression based on the nanotube surface energy. We show that solubility parameters based on surface energy give equivalent results to Hansen solubility parameters. However, we note that, contrary to solubility theory, a number of nonsolvents for nanotubes have both Hansen and surface energy solubility parameters similar to those calculated for nanotubes. The nature of the distinction between solvents and nonsolvents remains to be fully understood.