Synthesis of length-controlled aerosol carbon nanotubes and their dispersion stability in aqueous solution

Langmuir : the ACS Journal of Surfaces and Colloids
Young Kyun MoonSoo H Kim

Abstract

A one-step method combining spray pyrolysis and thermal chemical vapor deposition (CVD) processes was developed to grow hybrid carbon nanotube (CNT)-bimetallic composite particles. Nickel, aluminum, and acetylene were used as the catalytic site, noncatalytic matrix, and hydrocarbon source, respectively. The bimetallic particles (i.e., Al-Ni) were spray pyrolized and subsequently passed through thermal CVD. During the thermal CVD, the catalytic decomposition of acetylene occurred on the free-floating bimetallic particles so that sea urchin-like CNTs were radially grown. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses revealed the CNTs to have a uniform diameter of approximately 10 +/- 2 nm. The length of the CNTs was controlled by varying the residence time of the bimetallic nanoparticles with a length of 200-1000 nm. After nitric acid treatment, the CNTs were released by melting the bimetallic particles. The resulting CNTs were then dispersed in an aqueous solution to examine the effect of the length of CNTs on their dispersion stability, which is a critical issue for the stability and repeatability of the heat transfer performance in nanofluids. Ultraviolet-visible (UV-vis) spectrometer a...Continue Reading

References

May 14, 2003·Journal of Colloid and Interface Science·Linqin JiangJing Sun
Mar 11, 2006·The Journal of Physical Chemistry. B·S H Kim, M R Zachariah

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Citations

Oct 2, 2014·Journal of Occupational and Environmental Hygiene·N Neubauer, G Kasper
Apr 8, 2015·Colloids and Surfaces. B, Biointerfaces·Agnese BlandinoLuca Santi
Nov 15, 2016·Chemical Society Reviews·Sandeep KumarKi-Hyun Kim
Jan 14, 2021·Nanomaterials·Mohammad Taghi AhmadiMichal Petrů
Apr 2, 2010·ACS Applied Materials & Interfaces·Markus AntoniettiJohn Texter
Jun 18, 2018·Journal of Hazardous Materials·Rosa FreitasEtelvina Figueira

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