Dispersion state and rheological characteristics of carbon nanotube suspensions

Carbon nanotube (CNT) suspensions were prepared with a fixed CNT concentration dispersed in N-methyl-2-pyrrolidone containing a dispersion agent using a combination of shear mixing and ball-milling methods. To investigate the dispersibility of CNTs, we examined their rheological behaviors using a ro...

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Bibliographic Details
Published in:Journal of industrial and engineering chemistry (Seoul, Korea) 2017, 52(0), , pp.369-375
Main Authors: Piao, Shang Hao, Kim, Min Hwan, Choi, Hyoung Jin, Lee, Hyeonju, Park, Jaehoon
Format: Article
Language:English
Subjects:
Carbon nanotube
Dispersion stability
Rheology
Suspension
화학공학
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Summary:Carbon nanotube (CNT) suspensions were prepared with a fixed CNT concentration dispersed in N-methyl-2-pyrrolidone containing a dispersion agent using a combination of shear mixing and ball-milling methods. To investigate the dispersibility of CNTs, we examined their rheological behaviors using a rotational rheometer, and used a spin-coating process to analyze the surface morphology and thickness of CNT films to support the rheological measurements. [Display omitted] •A spin-coating process was applied for the analysis of dispersion stability of CNT suspensions along with rheology.•Effect of different mixing condition of shear mixing and ball-milling technique on CNT suspensions were focused.•CNT suspension at a given composition ratio between CNT and dispersion agent shows a good dispersion stability at an optimized ball-milling time. We prepared carbon nanotube (CNT) suspensions with a fixed CNT concentration dispersed in N-methyl-2-pyrrolidone containing a dispersion agent to study dispersion stability of CNTs. Surface morphology and thickness of the CNT films fabricated via spin-coating were measured by an optical microscope and high-resolution scanning electron microscope, respectively. Furthermore, light transmittance measurements were performed using a transmission densitometer. Rheological behaviors measured using a rotational rheometer showed that while the ball-milled CNT suspensions showed better dispersion stability compared to the ‘pre-milling’ suspension, the dispersion stability depended on the milling time, with the effectiveness decreasing when the time increased above an optimal value.
ISSN:1226-086X
1876-794X
DOI:10.1016/j.jiec.2017.04.016