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Zhu, H., Zhang, C., Tang, Y., Wang, J., Ren, B., & Yin, Y. (2007). Carbon, 45(1), 226-228.
Suspensions containing nanoparticles (nanofluids) have much higher thermal conductivity than the corresponding blank liquid. Therefore, they are considered as the next generation of heat transfer fluids.
Preparation of Graphite Nanoparticle Suspension
The typical preparation method of graphite suspension is as follows: graphite nanopowder is dispersed in a required amount of distilled water, and the pH value of the mixture is adjusted to about 9.5 with aqueous ammonia. 0.5wt% of polyvinyl pyrrolidone (PVP-K30) is added as a dispersant. After the suspension is subjected to ultrasonic vibration for 30 minutes, a graphite suspension is then obtained.
Thermal Conductivity of Graphite Suspension
The thermal conductivity of graphite suspension was measured at room temperature using the transient hot-wire method. In the figure, the thermal conductivity of graphite suspension is a function of graphite nanopowder volume fraction. The reported thermal conductivities of MWCNTs suspensions (at room temperature) are also included for comparison. It can be seen that adding graphite nanoparticles to water significantly increases the thermal conductivity. The reinforcement increases with increasing graphite concentration.
Zhou, Shi-dong, et al. "Effect of graphite nanoparticles on promoting CO2 hydrate formation." Energy & Fuels 28.7 (2014): 4694-4698.
The thermal properties of nanoparticles are the key factors that determine the heat transfer coefficient of the hydrate formation system. Therefore, it is necessary to find materials with high thermal conductivity to promote the formation of hydrates. Here, graphite nanoparticles are selected because of its high heat transfer coefficient and low price among metalloids and oxide nanoparticles.
Effect of Nanographite on Promoting CO2 Hydrate Formation
A series of experiments were conducted under certain conditions, with a hydrate reaction time of 800 min. The results showed that nanographite particles had a positive effect on the formation of hydrates. Compared with pure water, the induction time for hydrate formation in the presence of graphite nanoparticles was reduced by 80.8%, while the maximum CO2 consumption increased by 12.8%. In addition, in the presence of nanographite particles, the hydrate reaction was 98.8% complete within 400 minutes. There is enough reason to believe that these results obtained from CO2 may inspire us to study the effect of graphite nanoparticles on promoting the formation of natural gas hydrates.
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