The encapsulation of phase change materials (PCMs) as thermal energy storage materials is a big issue. PCM is usually encapsulated to avoid spillage, flammability and its reaction with the surrounding environment to improve its application. In the last decade, various methods have been employed and all kinds of microencapsulated PCM are produced. In this paper, we present a facile route to produce an encapsulated PCM with an organic and inorganic shell. The encapsulated phase change material (PCM) was prepared using a coaxial micro-fluidic system combined with an ionic cross-linking process. The alginate was used as the basic shell and a range of capsules was obtained by modifying the original shell using two inorganic components such as sodium carbonate and sodium silicate. Various samples, each with a different surrounding layer, were prepared by combining alginate calcium (Alg–Ca) as an organic shell with an inorganic component such as alginate calcium carbonate (Alg–CaCO₃) and alginate calcium silicate (Alg–CaSiO₃). In these experimental works, we have investigated the compatibility and the stability of capsules modified with the inorganic component. The scanning electron microscopy (SEM) technique and optical microscopy were utilized to study the capsule morphology. The chemical composition of the shell was evaluated by Fourier transform infrared spectroscopy (ATR-FTIR), thermogravimetry analysis and SEM coupled with the EDX analysis, and the capsule stability was estimated under an accelerated thermal cycling.

中文翻译：

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用纳米碳酸钠和硅酸盐改性的藻酸盐包封相变材料

相变材料（PCM）作为热能存储材料的封装是一个大问题。通常将PCM封装起来，以避免溢出，可燃性及其与周围环境的反应，从而改善其应用。在过去的十年中，已经采用了各种方法，并且生产了各种微囊化的PCM。在本文中，我们提出了一种生产带有有机和无机壳的封装PCM的简便方法。封装的相变材料（PCM）是使用同轴微流体系统结合离子交联工艺制备的。将藻酸盐用作基本壳，并通过使用两种无机成分（例如碳酸钠和硅酸钠）修饰原始壳来获得一系列胶囊。各种样本，每个样本都有不同的周围层，₃）和藻酸盐硅酸钙（Alg–CaSiO ₃）。在这些实验工作中，我们研究了用无机成分改性的胶囊的相容性和稳定性。扫描电子显微镜（SEM）技术和光学显微镜被用来研究胶囊的形态。通过傅立叶变换红外光谱法（ATR-FTIR），热重分析和SEM与EDX分析相结合来评估壳的化学成分，并在加速的热循环下评估胶囊的稳定性。