纳米低温保护剂导热系数研究

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 Study On The Thermal Conductivity Of Nano-cryoprotectant

The coefficient of thermal conductivity of glycerin solution was measured by the transient hotline method, in which the concentration was 10%, 20%, 30%, 40%, 50% respectively with the SiO2 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-1g/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-cryoprotectant thermal conductivity decreases with decreasing temperature. If the temperature is lower than 260K, nanoparticles had no effect on the thermal conductivity of nano-cryoprotectant.