不同分散剂条件下氧化铜纳米颗粒的稳定性研究

纳米流体作为新型传热介质可以提高传热系数,而其分散性和稳定性是影响热传递的主要因素,文章讨论了影响纳米氧化铜分散性的主要因素。通过Zeta电位和粒径的测定,讨论了pH值和三种不同的分散剂(SDBS、CATB、阿拉伯胶)对氧化铜纳米流体分散性的影响。发现pH值在8左右时,SDBS、阿拉伯胶做为分散剂时纳米Al2O3悬浮液的Zeta电位绝对值较大,粒径较小;在pH值在2～3之间时,CATB做为分散剂时Al2O3纳米悬浮液的Zeta电位绝对值较大,粒径较小。其中在各个分散剂最佳pH值范围内,SDBS作为分散剂时,纳米氧化铝悬浮液的Zeta电位绝对值最大,粒径最小。

Study on Stability of Al2O3-Nanoparticles with Different Dispersants

As us known, nanofluids can enhance heat transfer, and the dispersion and stability of nanofluids are the key factors to enhance heat transfer, so in this paper we mainly discussed the factors which can influence the dispersion of Al2O3-nanosuspensions. Through zeta-potential and particle size measurements in Al2O3-nanosuspensions, the influence of different pH value and the three different kinds of dispersants (SDBS, CATB and Gum arabic) on the dispersion of Al2O3-nanoparticles were discussed. We find that the absolute value of zeta-potential is the biggest and the size of particles is the smallest with SDBS and Gum arabic dispersants when the pH value of nanofluids is about 8, and the absolute value of zeta-potential is the biggest and the size of particles is the smallest with CATB dispersants when the pH value of nanofluids is about 2~3. We also find that nanofluids has a good dispersion when SDBS used as dispersant, which has the biggest absolute value of Zeta-potential and the smallest particle size.