关键词: 纳米粒子, 表面活性剂, 密度, 黏度, 关联性

Abstract: In this research，the nanofrigeration oil with good stability were prepared by adopting polyvinylpyrrolidone （PVP-K30）to modify molybdenum disulfide nanoparticles. Tests on the density and viscosity of 5 nanorefrigeration oil with different proportions（mass fraction of molybdenum disulfide is 0.25%，0.5%，0.75%，1%，1.25%，1.5%，respectively）were carried out using rotating viscometer and densimeter within the temperature range of 288K to 333K. Based on the experimental results，data-fitting was done correspondingly. The experimental results showed that：MoS2 nanoparticles had good dispersion stability in low concentration nanorefrigeration oil after modified by PVP. The nanorefrigeration oil presented the best dispersion performance when mass fraction proportion of MoS2 and PVP was 1∶1；with the increase of mass fraction of MoS2 and PVP，the viscosity of nanorefrigeration oil decreased and the reduction was more obvious in lower temperature conditions；the measured values of density of nanorefrigeration oil were basically consistent with the calculated values，and 90 percent of the values calculated from viscosity-density correlation agreed with the experimental data. The results of the research provided important data foundation for application of nanorefrigeration oil in fields of heat transfer，flow and friction.

Key words: nanoparticles, surfactant, density, viscosity, relevance