Shape-stabilized phase change materials based on superhydrophobic polymethylsilsesquioxane aerogels with extremely high
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Shape‑stabilized phase change materials based on superhydrophobic polymethylsilsesquioxane aerogels with extremely high paraffin loading for energy storage Sipeng Guo1 · Wei Chu1 · Jing Zhang1 · Xiaochan Liu1 · Xinfu Zhao1 · Benxue Liu1 · Xibin Yi1 Accepted: 10 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Organic phase change materials (PCMs) play an important role in heat energy storage, but they are also limited by the leakage problem in the process of phase change. Herein, shape-stabilized composite PCMs (ssPCMs) are successfully obtained by impregnating paraffin (PA) into the polymethylsilsesquioxane (PMSQ) aerogels. Due to abundant porosity, light weight, inherent superhydrophobic of PMSQ aerogels, lipophilic PA can be loaded into aerogels with a high PCMs loading rate up to 876% without alkylation process. Under the action of aerogel pores, PA in ssPCMs has high degree of crystallinity. The three-dimensional network structure of aerogels can effectively support the melting PA, and there is almost no leakage problem under the strong capillary force and surface tension. The ssPCMs show high latent heat in the range of 117.2 J/g to 122.9 J/g and excellent thermal stability and recyclability where their latent heat nearly remains 97% after 50 times of melting-crystallization cycles. More interestingly, when the temperature reaches above the melting point of PA, the ssPCMs changes from white to translucent. Thus, the synthesized ssPCMs exhibit considerable potential in energy storage applications, temperature intelligent response, thermal regulation. Keywords Phase change materials · Polymethylsilsesquioxane aerogels · Paraffin · Thermal energy storage
1 Introduction With the consumption of fossil energy and the requirements of environmental protection, energy storage in general [1, 2], and phase change materials (PCMs) in particular, have been a main topic in research [3–5]. In many ways of thermal energy storage, latent heat storage of PCMs is considered to have great application potential, because of its high energy storage density and specific phase change enthalpy at a specific temperature [6]. Organic solid–liquid PCMs have been widely studied because of their high heat storage density, high selectivity of phase transition temperature range, nontoxic and low undercooling [7]. However, it is difficult to use organic solid–liquid PCMs directly because of the leakage problem caused by the fluidity of liquid [8, 9]. * Xibin Yi [email protected] 1
Shandong Provincial Key Laboratory of Special Silicone‑Containing Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, People’s Republic of China
Injecting PCMs into porous skeleton is an effective way to overcome the leakage problem of PCMs. This kind of phase change composite material is known as shape-stabilized PCMs (ssPCMs) which fixed the PCM in the nanopore through capillary force, surface tension, hydrogen bond and other interaction between porous ma
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