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Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Dry Oxidation and Vacuum Annealing Treatments for Tuning the Wetting Properties of Carbon Nanotube Arrays

Published on: April 15, 2013

Self-rewetting fluids with suspended carbon nanostructures.

R Savino¹, R Di Paola, D Mirabile Gattia

¹DIAS, University of Naples Federico II, P.le V Tecchio 80, 80125 Napoli, Italy.

Journal of Nanoscience and Nanotechnology

|March 10, 2012

Summary

Researchers studied self-rewetting fluids, which have surface tension increasing with temperature. Nanofluids with carbon nanohorns show potential for advanced thermal management in electronics and space applications.

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Area of Science:

Materials Science
Thermodynamics
Fluid Dynamics

Background:

Effective thermal management is crucial for modern electronic systems.
Self-rewetting fluids, with surface tension increasing with temperature and concentration, are of particular interest for heat transfer.
Nanofluids, suspensions of nanoparticles, are being explored as advanced heat transfer fluids.

Purpose of the Study:

To investigate the thermophysical properties of nanofluids based on water/alcohol solutions with suspended carbon nanostructures.
To synthesize single-wall carbon nanohorns (SWNH) for use in these nanofluids.
To evaluate the potential of these nanofluids for enhanced heat transfer applications.

Main Methods:

Synthesis of single-wall carbon nanohorns (SWNH) using an AC arc discharge in open air.
Preparation of nanofluids by suspending SWNH in water/alcohol solutions.
Measurement of thermophysical properties, including surface tension, wettability, and thermal conductivity, at various temperatures.

Main Results:

The synthesized SWNH-based nanofluids exhibit anomalous positive surface tension gradients with temperature, similar to binary self-rewetting solutions.
These nanofluids demonstrate potential for inducing strong liquid inflow towards hot regions during phase change.
The study provides data on the thermophysical properties of these novel heat transfer fluids.

Conclusions:

Nanofluids containing single-wall carbon nanohorns show promise as effective self-rewetting heat transfer fluids.
Their unique surface tension properties enable efficient liquid transport, beneficial for phase-change heat transfer.
Potential applications include advanced wickless heat pipes for space technology and terrestrial electronic cooling.