Abstract
Superhydrophobic and superoleophilic oxidized copper foam (OCF) was prepared by oxidation of copper foam using (NH4)2S2O8 to generate rough surface then followed by modification with low surface energy substance polydimethylsiloxane (PDMS) and stearic acid (SA). Based on sperwetting, form-stable phase change materials (PCMs) composites were obtained by facile absorbing of organic PCMs into PDMS-OCF network. In this way, the organic PCMs can be spontaneously adsorbed and remain stable without leakage even at high temperature over their melting points, and the thermal storage capacity of the as-synthesized PCMs composites were analyzed using a differential scanning calorimeter (DSC). The latent heats of the PDMS-OCF/PCMs composites were measured to be 36.87 J g-1 and 36.81 J g-1 for PDMS-OCF/paraffin and PDMS-OCF/SA, respectively, which is greater than that of untreated copper form (CF)/paraffin composite (8.50 J g-1). The PDMS-OCF/PCMs composite shows better thermal stability and the loaded organic PCM has been reduced by 0.64% after 100 times of melting-cooling recycling for PDMS-OCF/paraffin. The thermal conductivity of PDMS-OCF/paraffin composite is about 9 times that of pure paraffin. Such excellent thermal conductivity as well as good thermal stability of the PDMS-OCF/PCMs makes it promising candidate for thermal energy storage.
Highlights
With the continuous development of human society and economy, the consumption of energy was sharp increase, and environmental protection have been the focus of global studies
Our design relies in the utilization of superwetting PDMS-oxidized copper foam (OCF) to enhance the thermal stability and taking advantage of excellent thermal conductivity of copper foam to enhance the thermal conductivity of resulting phase change materials (PCMs) composites, which maybe expected to increase the comprehensive performance of PCMs composites
Contact angle (CA) measurements for the samples were performed on a contact angle meter (DSA100, Kruss).X-ray diffraction (XRD) measurements were performed on a X-ray diffractometer (D/Max-2400, Rigaku) with a Cu tube source, and 2 θ scans were obtained from 10° to 80°.The thermodynamic properties of pure paraffin, pure stearic acid (SA) and PCM composites were determined by differential scanning calorimetry (TGA/ DSC1, METTLERTOLEDO) at a heating and cooling rate of 5 oC min-1 in the temperature range of 20-110 oC under nitrogen atmosphere
Summary
With the continuous development of human society and economy, the consumption of energy was sharp increase, and environmental protection have been the focus of global studies. PCMs is a substance which is capable of storing and releasing large amounts of thermal energy during the state between melting and solidifying at a certain temperature In this way, heat is absorbed or released when the material changes from solid to liquid and vice versa[5]. Materials Research studies, we have developed a series of porous materials with superwetting wettability, including graphene-nickel[18] and PDMS-HNTs19, for loading of organic PCMs to fabrication of PCMs composites. We developed a new approach utilizing copper foam as supporting material, and paraffin and stearic acid as organic PCMs, to prepare novel PCMs composites. Our design relies in the utilization of superwetting PDMS-OCF to enhance the thermal stability and taking advantage of excellent thermal conductivity of copper foam to enhance the thermal conductivity of resulting PCMs composites, which maybe expected to increase the comprehensive performance of PCMs composites
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