纳米TiO_2/石蜡复合乳状液相变材料的制备与传热性能  

Preparation of Phase Change Material Based on Nano-TiO_2/wax Emulsion and Its Thermal Conductive Properties

作　　者：张平[1] 张国强[1] 唐益宁 郭艳妮[2] 何德良[2] ZHANG Ping;ZHANG Guoqiang;TANG Yining;GUO Yanni;HE Deliang(College of Civil Engineering,Hunan University,Changsha410082,China;College of Chemistry and Chemical Engineering,Hunan University,Changsha410082,China)

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]湖南大学化学化工学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2018年第12期117-123,共7页Journal of Hunan University:Natural Sciences

基　　金：湖南省科技重大专项资助项目(2011FJ1007)~~

摘　　要：蓄冷空调性能及制冷系数与相变材料密切相关.将石蜡复合乳状液作为分散介质,以纳米TiO_2粒子作为导热载体,采用低能乳化工艺微乳液转相法,制备出纳米TiO_2/石蜡复合乳状液相变材料,并对其分散稳定性、导热系数和蓄-放热循环稳定性进行了分析.研究结果表明:纳米TiO_2/石蜡复合乳状液相变材料的导热系数相对于纯石蜡乳状液的导热系数有明显提高,当纳米TiO_2粒子质量分数为0.15%时,纳米TiO_2/石蜡复合乳状液相变材料的导热系数比纯石蜡乳状液的导热系数提高了117.95%;TiO_2/石蜡乳状液固-液相变热循环过程中并无明显温度平台,而且其蓄-放热循环稳定性很好.该纳米TiO_2/石蜡复合乳状液相变材料有望应用于蓄冷空调,以提高蓄冷空调性能及制冷系数.The properties and performance coefficients of thermal storage air conditioning are closely related to the phase change materials.Nano-TiO2/wax composite emulsion phase change materials(NTWCEPCM)were prepared by using techniques of phase inversion and low energy emulsifying,where the wax and TiO2nanoparticles were used as dispersion medium and heat carrier,respectively.The effect of nano-TiO2on the performance of stability,thermal conductivity,and thermal cycling stability of NTWCEPCM was studied.The results show that the thermal conductivity of nano-TiO2/wax composite emulsion is significantly larger than that of pure wax emulsion;the thermal conductivity of nano-TiO2/wax composite emulsion increases by117.95%when the nano-TiO2particle content is0.15%.The phase change platform of nano-TiO2/wax emulsion in the solid-liquid phase is not obvious during thermal cycling.Moreover,the NTWCEPCM has good thermal cycling stability.The NTWCEPCM is expected to be used in thermal storage air conditioning for improving the performance of thermal storage air conditioning coefficient.

关 键 词：二氧化钛 相转化乳化法 复合乳状液 石蜡 相变材料 

分 类 号：O645[理学—物理化学]