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Nanotechnology. 2018 Aug 31;29(35):355702. doi: 10.1088/1361-6528/aac9f7. Epub 2018 Jun 4.

Boron doping induced thermal conductivity enhancement of water-based 3C-Si(B)C nanofluids.

Author information

1
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, People's Republic of China. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, People's Republic of China.

Abstract

In this paper, the fabrication and thermal conductivity (TC) of water-based nanofluids using boron (B)-doped SiC as dispersions are reported. Doping B into the β-SiC phase leads to the shrinkage of the SiC lattice due to the substitution of Si atoms (0.134 nm radius) by smaller B atoms (0.095 nm radius). The presence of B in the SiC phase also promotes crystallization and grain growth of obtained particles. The tailored crystal structure and morphology of B-doped SiC nanoparticles are beneficial for the TC improvement of the nanofluids by using them as dispersions. Using B-doped SiC nanoparticles as dispersions for nanofluids, a remarkable improvement in stability was achieved in SiC-B6 nanofluid at pH 11 by means of the Zeta potential measurement. By dispersing B-doped SiC nanoparticles in water-based fluids, the TC of the as-prepared nanofluids containing only 0.3 vol.% SiC-B6 nanoparticles is remarkably raised to 39.3% at 30 °C compared to the base fluids, and is further enhanced with the increased temperature. The main reasons for the improvement in TC of SiC-B6 nanofluids are more stable dispersion and intensive charge ions vibration around the surface of nanoparticles as well as the enhanced TC of the SiC-B dispersions.

PMID:
29863487
DOI:
10.1088/1361-6528/aac9f7

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