Cu/碳纳米纤维负载脂肪酸定形相变材料的制备与性能
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摘要
结合静电纺丝、物理吸附、预氧化炭化和原位还原的技术与原理,制备了3种不同铜纳米粒子含量的Cu/碳纳米纤维膜(Cu/CNFs1~3),从此作为定形相变材料(FSPCM)的支撑基体;根据最低共熔点理论和Schrader方程计算出月桂酸-肉豆蔻酸-硬脂酸(LA-MA-SA)三元脂肪酸的质量比例,用作制备FSPCM的相变物质。通过物理吸附法制备了Cu/CNFs负载LA-MA-SA的FSPCM1~3。探讨了不同铜纳米粒子含量的CNFs对FSPCM形貌与导热性能的影响。结果表明,FSPCM1~3的熔融时间分别缩短了23.0%、51.8%和38.2%,结晶时间分别缩短了47.8%、64.0%和62.6%。制备的FSPCM1~3的熔融相变温度和熔融热焓在32~36℃和88~122 kJ/kg之间,结晶相变温度和结晶热焓分别在24~26℃和89~120.9 kJ/kg之间。
Combined the technique and principle of electrospinning,physical adsorbing,preoxidation/carbonization and in-situ reduction,three kinds of copper/carbon nanofibrous mats( Cu/CNFs1 ~ 3) consisting of different content of nanoparticles were fabricated. The prepared Cu/CNFs was used as supporting material of form-stable phase change materials( FSPCM); based on the lowest eutectic point theory and Schrader equation,the mass ratio of lauric acid( LA),myristic acid( MA) and stearic acid( SA) was calculated. The LA-MA-SA ternary fatty acid eutectic mixture was fabricated as model PCM for preparation of FSPCM. Then,electrospun Cu/CNFs mats absorbed with LA-MA-SA ternary eutectic mixture were studied tofabricate FSPCM1 ~ 3. The effect of different content of Cu nanoparticleson morphology and thermal conductivity of FSPCM was studied. The melting time of the FSPCM1 ~ 3 was respectively reduced about 23.0%,51. 8% and 38. 2%,freezing time was respectively reduced about 47. 8%,64. 0% and 62. 6%. The melting temperatures and enthalpies of FSPCM1 ~ 3 are in the range of 32 ~ 36 ℃ and 88 ~ 122 kJ/kg,respectively. The crystallization temperatures and enthalpies of FSPCM1 ~ 3 are in the range of 24 ~ 26 ℃ and 89 ~ 120. 9 kJ/kg,respectively.
Combined the technique and principle of electrospinning,physical adsorbing,preoxidation/carbonization and in-situ reduction,three kinds of copper/carbon nanofibrous mats( Cu/CNFs1 ~ 3) consisting of different content of nanoparticles were fabricated. The prepared Cu/CNFs was used as supporting material of form-stable phase change materials( FSPCM); based on the lowest eutectic point theory and Schrader equation,the mass ratio of lauric acid( LA),myristic acid( MA) and stearic acid( SA) was calculated. The LA-MA-SA ternary fatty acid eutectic mixture was fabricated as model PCM for preparation of FSPCM. Then,electrospun Cu/CNFs mats absorbed with LA-MA-SA ternary eutectic mixture were studied tofabricate FSPCM1 ~ 3. The effect of different content of Cu nanoparticleson morphology and thermal conductivity of FSPCM was studied. The melting time of the FSPCM1 ~ 3 was respectively reduced about 23.0%,51. 8% and 38. 2%,freezing time was respectively reduced about 47. 8%,64. 0% and 62. 6%. The melting temperatures and enthalpies of FSPCM1 ~ 3 are in the range of 32 ~ 36 ℃ and 88 ~ 122 kJ/kg,respectively. The crystallization temperatures and enthalpies of FSPCM1 ~ 3 are in the range of 24 ~ 26 ℃ and 89 ~ 120. 9 kJ/kg,respectively.
引文
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[6]Xu B,Lou B Y,Liu C L,et al.Synthesis and properties of novel nano-copper/paraffin/expanded graphite thermo-sensitive composites[J].Chin.J.Mater.Res.,2012,26:101-106.
[7]Xiao X,Zhang P,Li M.Preparation and thermal characterization of paraffin/metal foam composite phase change material[J].Appl.Energy,2013,112:53-57.
[8]廖师琴,蒋淑冬,魏取福,等.偕胺肟基螯合纳米纤维的制备[J].化工新型材料,2012,40(2):53-55.Liao S Q,Jiang S D,Wei Q F,et al.Preparation of chelating nanofiber containing amidoxime group[J].New Chemical Materials,2012,40(2):53-55.