Abstract：A novel composite phase change materials (PCMs) of paraffin/TiO2/active-carbon was prepared by a microemulsion method, where paraffin acted as a PCM and titanium dioxide (TiO2) as matrix material, and a small amount of active carbon was added to improve the thermal conductivity. The compositions, morphology and thermal properties of the paraffin/TiO2/active-carbon composite PCMs were characterized by XRD, SEM, TGA and DSC respectively. The shape stability during phase change process of this composite was also tested. The results show that paraffin is well encapsulated by TiO2 matrix, and thus exhibiting excellent shape-stabilized phase change feature. Besides, this composite PCM also presents superhydrophobic property. Therefore, these multifunctional features will endow PCMs with important application potential in energy efficient buildings.
 LI B X, LIU T X, WANG Y F. Preparation and property of paraffin/CaCO3 composite as form-stable phase change material for thermal energy storage[J]. Asian Journal of Chemistry, 2012, 24(9): 4232-4234.
 HAO Y G, SHAO X K, LIU T X, et al. Porous MgO material with ultrahigh surface area as the matrix for phase change composite[J]. Thermochimica Acta, 2015, 604: 45-51.
 葛治微, 李本侠, 王艳芬, 等. 有机/无机复合定形相变材料的制备及应用研究进展[J]. 化工新型材料, 2013, 41(12): 165-167. GE Z W, LI B X, WANG Y F, et al. Research progress on the preparation and application of the inorganic/organic phase change materials[J]. New Chemical Meterials, 2013, 41(12): 165-167.
 LI B X, LIU T X, HU L Y, et al. Fabrication and properties of microencapsulated paraffin@SiO2 phase change composite for thermal energy storage[J]. ACS Sustainable Chemistry & Engineering, 2013, 1(3): 374-380.
 马烽, 秦岩, 陆丰艳, 等. 棕榈酸-十六醇/二氧化硅相变储能材料的低热固相合成与表征[J]. 材料工程, 2014,(10): 71-74. MA F, QIN Y, LU F Y, et al. Synthesis and characterization of palmitic acid-hexadecanol/SiO2 phase change energy storage materials by solid-state chemical reaction at low temperature[J]. Journal of Materials Engineering, 2014,(10): 71-74.
 付路军, 董发勤, 杨玉山, 等. 二元脂肪酸/SiO2 复合相变储能材料的制备与表征[J]. 功能材料, 2013, 44(4): 548-551. FU L J, DONG F Q, YANG Y S, et al. The preparation and characterization of binary fatty acid/SiO2 composite phase change energy storage materials[J]. Functional Materials, 2013, 44(4): 548-551.
 RONALD J, WARZOHA A, AMY S F. Improved heat recovery from paraffin-based phase change materials due to the presence of percolating graphene networks[J]. International Journal of Heat and Mass Transfer, 2014,79: 314-323.
 LACHHEB M, KARKRI M, ALBOUCHI F, et al. Thermal properties measurement and heat storage analysis of paraffin/graphite composite phase change material[J]. Composites: Part B, 2014, 66: 518-525.
 杨化, 毛键, 冯杰. 石蜡/SiO2 复合相变材料的制备及性能测试[J]. 材料导报, 2010, 24(15): 278-281. YANG H, MAO J, FENG J. Preparation and performance test of paraffin/SiO2 composite phase change materials[J]. Materials Review, 2010, 24(15): 278-281.
 HO C Y, GAO J Y. Preparation and thermophysical properties of nanoparticle-in-paraffin emulsion as phase change material[J]. International Communications in Heat and Mass Transfer, 2009, 36: 467-470.
 张秋香, 陈建华, 陆洪彬, 等. 石蜡微胶囊相变材料的制备及其在建筑节能领域中的应用[J]. 材料导报: 综述篇, 2014, 28(9): 79-83. ZHANG Q X, CHEN J H, LU H B, et al. Preparation of paraffin microcapsule phase change materials and their application in the field of building energy efficiency[J]. Materials Review: Review Article, 2014, 28(9): 79-83.
 WANG H, WANG J P, WANG X C. Preparation and properties of microencapsulated phase change materials containing two-phase core materials[J]. Industrial & Engineering Chemistry Research, 2013, 52(41): 14706-14712.
 PAN L, TAO Q H, ZHANG S D, et al. Preparation, characterization and thermal properties of micro-encapsulated phase change materials[J]. Solar Energy Materials & Solar Cells, 2012, 98: 66-70.
 CHEN Z, SHAN F, CAO L, et al. Synthesis and thermal properties of shape-stabilized lauric acid/activated carbon composites as phase change materials for thermal energy storage[J]. Solar Energy Materials & Solar Cells, 2012, 102: 131-136.
 CHU Z L, SEEGER S. Superamphiphobic surfaces[J]. Chemical Society Reviews, 2014, 43(8): 2784-2798.