One-step Oxidation of Nano Carbon Materials to Enhance the Thermal Properties of Glauber's Salt PCMs
JIANG Zipeng1, ZHANG Yu1, TIE Jian1,2, TIE Shengnian1
1 Qinghai Provincial Key Laboratory of Advanced Materials and Applied Technology, Qinghai University, Xining 810016, China 2 College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810016, China
Abstract: Na2SO4·10H2O and Na2CO3·10H2O composites were used as the basic phase change materials (PCMs), and multi-walled carbon nanotubes and carbon nano powder were modified to form hydrophilic groups on the surface of materials by one-step oxidation with concentrated H2SO4 and concentrated HNO3. The modified carbon nanomaterials were used as the additives to prepare modified carbon nano powders/Na2SO4·10H2O composites PCMs. The experimental result shows that the two kinds of mixed acids can effectively oxidize to form abundant hydrophilic carboxyl groups on the surface of the nano carbon materials, and the O element content of two kinds of modified carbon nanomaterials increases to 7.93at% and 10.53at%, respectively; the surface carboxyl groups of the nano carbon can effectively affinity and uniformly distribute with the glauber's salt-based composite PCMs; the latent heat of phase change after adding 0.05at%, 0.1at% and 0.25at% of different kinds of modified carbon nano materials of them are greater than 200 J·g-1, while the thermal conductivity and thermal diffusion coefficients are greatly improved, and the prepared PCMs exhibit excellent thermal properties. After 200 cycles, the PCMs can still maintain a high phase transition latent heat and a low phase transition supercooling degree. In this work, the modified carbon nano materials/Na2SO4·10H2O composite PCMs with excellent and stable thermal properties were successfully prepared by one-step oxidation method.
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