纳米低温保护剂导热系数研究  

Study on the Thermal Conductivity of Nano-cryoprotectant

作　　者：唐临利[1] 刘宝林[1] 郝保同[1] 刘连军[1] 

机构地区：[1]上海理工大学生物系统热科学研究所,上海200093

出　　处：《制冷学报》2013年第4期35-39,共5页Journal of Refrigeration

基　　金：国家自然科学基金(50176018)资助项目~~

摘　　要：用瞬态热线法测量了SiO2纳米粉体加入到浓度为10%、20%、30%、40%、50%的丙三醇溶液中制备成的纳米低温保护剂在260K^290K下的导热系数,研究纳米低温保护剂导热系数与纳米颗粒含量、保护剂浓度以及温度的关系。结果表明:随着纳米颗粒的添加量增多(0.5g/L^1g/L),甘油溶液导热系数增大;甘油浓度从10%升高到50%时,纳米低温保护剂导热系数增加率也随之提高,从0.4%提高到6.8%;纳米低温保护剂导热系数随温度降低而减小,当温度低于260K后,纳米颗粒对保护剂导热系数几乎无影响。建议应用在解冻和复温过程中。The coefficient of thermal conductivity of glycerin solution was measured by the transient hotline method, in which the concen- tration was 10% , 20%, 30% , 40%, 50% respectively with the SiO： nano powder. And the relationship of thermal conductivity with nano content, concentration of glycerin solution and measuring temperature was investigated. The results indicated that, with the increase of the nano-particles＂ additional amount（0.5g/L-lg/L）, glycerin solution coefficient of thermal conductivity increase; when the glycerol concentration increased from 10% to 50% , the thermal conductivity increased from 0.4% to 6.8% ; and the nano-eryoprotectant thermal conductivity decreases with decreasing temperature. If the temperature is lower than 260K, nanoparticles had no effect on the thermal con- ductivity of nano-eryoproteetant.

关 键 词：纳米颗粒 导热系数 低温保护剂 温度 

分 类 号：TB383[一般工业技术—材料科学与工程] TK124[动力工程及工程热物理—工程热物理]