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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

SURFACE MODIFICATION DRIVEN PHASE CHANGE PROPERTIES OF ORGANICS ONFINED IN NANOPORES MATRIX FOR SHAPE STABLED PHASE CHANGE MATERIALS

Daili Feng
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, P.R. China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, P.R. China

Yanhui Feng
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China

Mengya Xiong
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, P.R. China

Chen Wang
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, P.R. China

Ge Wang
Beijing Key Laboratory of Function Materials for Molecule & Structure Construction, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P.R. China

Xinxin Zhang
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Key Laboratory of Energy Saving and Emission Reduction for Metallurgical Industry, University of Science and Technology Beijing, Beijing 100083, China

DOI: 10.1615/IHTC16.ecs.023771
pages 4393-4410


MOTS CLÉS: Thermal storage, Thermophysical properties, surface modification, phase change, interactions, molecular dynamic simulation

Résumé

Loading capacity and crystallization behaviors of organic phase change materials confined in porous supports, are prerequisites for the shape stability, storage and release of latent heat in composite PCMs. In this article, we found that the interaction force between fillers and pore surface of the substrates determined the capacity and crystallization. However, the interactions could be regulated by the surface modification on supporters. Here, the metal organic framework Cr-MIL-101 and mesoporous zeolite MCM-41 were chosen as the supporters, which were modified with functional terminals, such as -NH2 or -OH. A physical blending and impregnation method was applied to assemble the stearic acid(SA) and polyethylene glycol(PEG) into host matrix. FTIR and DSC characterization studies have been conducted to reveal the structural and thermal properties of the achieved PCM composites. Results showed that after amino group, the max mass percentage of SA was increased from 30% of SA@Cr-MIL-101 to 70% of SA@Cr-MIL-101-NH2, besides, the fusion enthalpy was increased from 0 J/g of PEG@MCM-41(-OH) to 58.76 J/g of PEG@MCM-41-NH2. MD simulation was also introduced in to explain the experimental phenomena. It can be concluded that the interaction between core materials and supports could be regulated by modifying the internal surface of supports: suitably reinforced interactions lead higher loading, but too heavy interactions restrict the motion of filler molecules, results in low crystallization, even with no fusion enthalpy. Surface functionalization is indicated to be very salutary to regulate the phase change properties of this core-shell type composite PCMs, such as loading capacity and crystallization, and how to balance those properties is essential to meet a high energy storage efficiency.

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