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)
...
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.
@en