中文摘要：

为通过表面活性剂抑制纳米制冷剂中的颗粒团聚,需要了解不同种类和浓度的表面活性剂对纳米制冷剂颗粒团聚的影响。本文采用动态光散射技术测量纳米制冷剂中的颗粒尺度,来定量分析纳米制冷剂的颗粒团聚特性;实验所用纳米制冷剂为TiO_2-R141b;表面活性剂种类包括SDBS（阳离子型）、CTAB（阴离子型）和NP-10（非离子型）。实验结果表明,SDBS、CTAB和NP-10均可降低纳米制冷剂的颗粒尺度,即抑制纳米制冷剂中的颗粒团聚。对SBDS、CTAB和NP-10,当其浓度分别为400 mg·L（-1）、200 mg·L（-1）和300mg·L（-1）时纳米制冷剂的颗粒尺度最小,最小值分别是未加表面活性剂时的58.4%、56.9%和38.0%。

英文摘要：

In order to inhibit the particle agglomeration in refrigerant-based nanofluids（nanorefrigerant） using surfactant,the effects of type and concentration of surfactant on particle agglomeration should be known.In this article,the dynamic average particle size of nano-refrigerant was measured using dynamic light scattering（DLS） technique,to analyze the particle agglomeration characteristics quantitatively.The nano-refrigerant used was TiO_2-R141 b,and the surfactants include SDBS（cationic-type）,CTAB（anionic-type） and NP-10（nonionic-type）.The results show that SDBS,CTAB and NP-10 can reduce the particle agglomeration in nano-refrigerant;the effects are minimized when their surfactant concentrations are 400 mg·L（-1）,200 mg·L（-1） and 300 mg·L（-1）,respectively,and the minimal value arc respectively 58.4%,56.9%and 38.0%as much as those without surfactant addition.