The biggest challenge for organic phase change materials(PCMs)used in cold energy storage is to maintain high heat storage capacity while reducing the leakage risk of PCMs during the phase transition process.This is c...The biggest challenge for organic phase change materials(PCMs)used in cold energy storage is to maintain high heat storage capacity while reducing the leakage risk of PCMs during the phase transition process.This is crucial for expanding their applications in the more demanding cold storage field.In this study,novel formstable low-temperature composite PCMs are prepared with mesoporous materials,namely SBA-15 and CMK-3(which are prepared using the template method),as supporting matrices and dodecane as the PCM.Owing to the combined effects of capillary forces within mesoporous materials and interactions among dodecane molecules,both dodecane/SBA-15 and dodecane/CMK-3 exhibit outstanding shape stability and thermal cycling stability even after 200 heating/cooling cycles.In comparison to those of dodecane/SBA-15,dodecane/CMK-3 exhibits superior cold storage performance and higher thermal conductivity.Specifically,the phase transition temperature of dodecane/CMK-3 is-8.81℃ with a latent heat of 122.4 J·g^(-1).Additionally,it has a thermal conductivity of 1.21 W·m^(-1)·K^(-1),which is 9.45 times that of dodecane alone.All these highlight its significant potential for applications in the area of cold energy storage.展开更多
文摘采用浸渍法将含有磺酸基的对甲苯磺酸负载在SBA-15表面上,合成含有一定酸性的固体酸催化剂TsOH-SBA-15。催化剂的制备条件为:对甲苯磺酸的浸渍浓度为0.5 mol/L,焙烧温度为300℃,焙烧时间为4 h。用XRD,IR,DTA/TGA,氮吸附-脱附等方法对改性后的样品进行表征。结果表明,改性后的SBA-15分子筛的结构未发生变化,仍具有有序孔道结构。TsOH-SBA-15催化剂对冰乙酸和正丁醇的酯化反应具有较高的活性,正交实验结果为:反应时间80 m in,n(冰乙酸)∶n(正丁醇)=1∶1.2,催化剂用量为冰乙酸质量的5%,此时酯化率可达到95%。
基金supported by the National Natural Science Foundation of China(Grant No.51906230)the Key scientific and technological projects in Henan Province(Grant No.212102210007)the Project of Zhongyuan Science and Technology Innovation Talents(Grant No.234200510011).
文摘The biggest challenge for organic phase change materials(PCMs)used in cold energy storage is to maintain high heat storage capacity while reducing the leakage risk of PCMs during the phase transition process.This is crucial for expanding their applications in the more demanding cold storage field.In this study,novel formstable low-temperature composite PCMs are prepared with mesoporous materials,namely SBA-15 and CMK-3(which are prepared using the template method),as supporting matrices and dodecane as the PCM.Owing to the combined effects of capillary forces within mesoporous materials and interactions among dodecane molecules,both dodecane/SBA-15 and dodecane/CMK-3 exhibit outstanding shape stability and thermal cycling stability even after 200 heating/cooling cycles.In comparison to those of dodecane/SBA-15,dodecane/CMK-3 exhibits superior cold storage performance and higher thermal conductivity.Specifically,the phase transition temperature of dodecane/CMK-3 is-8.81℃ with a latent heat of 122.4 J·g^(-1).Additionally,it has a thermal conductivity of 1.21 W·m^(-1)·K^(-1),which is 9.45 times that of dodecane alone.All these highlight its significant potential for applications in the area of cold energy storage.
