Based on the study of phase change energy storage of nano materials,Fe3O4-coated multi-walled carbon nanotubes (MWCNT) water-based nanomagnetic fluid was prepared by chemical coprecipitation method.The solidification characteristics of oriented MWCNT magnetic fluid that functionalized by concentrated nitric acid and dispersant were experimentally studied under magnetic field.The results showed that the magnetic MWCNT with high saturation magnetization could be prepared at a reaction temperature of 70℃ and a reaction time of 30 min.The MWCNT magnetic fluid with surfactant sodium dodecyl benzene sulfonate (SDBS) had the optimal solidification characteristics under the magnetic field.Compared with the pure water,the supercooling was reduced by 68.6%,the nucleation time was advanced by 76.4%,and the total solidification time was shortened by 36.2%.Furthermore,the investigation of the solidification rate and heat flow density revealed that the solidification rate of magnetic fluid could reach 8 mL/min,which was 1.60 times that of water.Moreover,the average solidification rate at 25% time of solidification was 2 times that of total average rate,and the initial heat flow density reached up to 5500W/m2,which was 1.55 times that of water.
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基金资助
国家自然科学基金(51906013);北京建筑大学培育项目专项资金(X23041);北京建筑大学研究生创新项目(PG2023056)
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