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![DSC thermograms of the hybrid organic-inorganic prepared PCMs:: a) 2[(C n H 2n+1 ) 2 NH 2 ][MnCl 4 ]; b) 2[(C n H 2n+1 ) 2 NH 2 ][FeCl 4 ]; and c) 2 [(C n H 2n+1 ) 2 NH 2 ][CuCl 4 ].](profile/Angel-Serrano-3/publication/381758535/figure/fig3/AS:11431281257584848@1719821686038/DSC-thermograms-of-the-hybrid-organic-inorganic-prepared-PCMs-a-2C-n-H-2n-1-2-NH-2.png)
DSC thermograms of the hybrid organic-inorganic prepared PCMs:: a) 2[(C n H 2n+1 ) 2 NH 2 ][MnCl 4 ]; b) 2[(C n H 2n+1 ) 2 NH 2 ][FeCl 4 ]; and c) 2 [(C n H 2n+1 ) 2 NH 2 ][CuCl 4 ].
![Fig. 1. FT-IR spectra of a) DDA; b) [DDA] 2 [FeCl 4 ]; c) [DDA] 2 [MnCl...](profile/Angel-Serrano-3/publication/381758535/figure/fig1/AS:11431281257584846@1719821685649/FT-IR-spectra-of-a-DDA-b-DDA-2-FeCl-4-c-DDA-2-MnCl-4-and-d-DDA-2-CuCl_Q320.jpg)
![Fig. 2. XRD spectra of a) 2[(C n H 2n+1 ) 2 NH 2 ][MnCl 4 ]; b) 2[(C n...](profile/Angel-Serrano-3/publication/381758535/figure/fig2/AS:11431281257584847@1719821685803/RD-spectra-of-a-2C-n-H-2n-1-2-NH-2-MnCl-4-b-2C-n-H-2n-1-2-NH-2-FeCl-4_Q320.jpg)
![Fig. 6. DSC thermogram of 1st (blue) and 500th (black) cycle for [DODA]...](profile/Angel-Serrano-3/publication/381758535/figure/fig5/AS:11431281257584850@1719821686371/DSC-thermogram-of-1st-blue-and-500th-black-cycle-for-DODA-2-MCl-4-compounds_Q320.jpg)
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Context 1
... was used as a tool to evaluate the solid-solid transitions of the novel prepared organic-inorganic ionic materials and the enthalpy involved in the solid-solid phase change (Supporting information S3). In Fig. 3 are shown the third heating and cooling cycles of the prepared hybrid organic-inorganic compounds, in which the influence of the length of the n-alkyl chain in the transition temperature seems to be evident. In fact, it was found that the temperature at which the solid--solid transition take place increases proportionally with the ...
Context 2
... as well for the ionic compound bearing n-monoalkylamines as cations as reported in the scientific literature. [17,18,22] The subcooling is an important parameter for a PCM implementation in a TES system, the narrower temperature window for the storage/release of heat the better the performance. In this sense, as it can be seen in DSC thermograms (Fig. 3) no subcooling phenomena was observed for any of the hybrid organic-inorganic ionic ...
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... Fortunately, by reducing the reliance on fossil fuels, several approaches have been explored to address these problems, as exemplified by the utilization of renewable energy [4,5] and the improvement of energy efficiency [6,7], with the latter receiving particular attention. At present, one of the cutting-edge technologies to enhance the efficiency of thermal energy utilization is the usage of phase change materials (PCMs), which store and release large amounts of latent heat via phase change, thereby enabling thermal energy management and energy saving [8][9][10][11]. ...
The preparation of phase change materials (PCMs) with excellent heat storage capacity, shape stability, and working durability is of vital importance for their popularization and application. In this work, a series of form‐stable PCMs was prepared via blending diglycidyl ether of bisphenol A (DGEBA), aliphatic anhydride with octadecyl side chains (MNAO), and paraffin together followed by thermal curing. Thanks to the plasticizing effect and self‐assembly of paraffin, the crystalline behavior of paraffin and MNAO was hardly limited by the epoxy network, and the latent heat of EP/Pa‐50 with 50 wt% paraffin content was high, up to 92.3 J/g. Meanwhile, EP/Pa‐50 had a low supercooling extent of 11.0°C. Instead of the significant reduction in other properties of most PCMs after being blended with paraffin, the overall performance of EP/Pa‐50 remained good due to the strong intermolecular interactions between paraffin and MNAO (based on their good compatibility) and the reliable epoxy network, and EP/Pa‐50 exhibited excellent shape stability without the leakage problem, high thermal stability (remain stable below 170°C) and good mechanical properties (tensile strength up to 10.5 MPa). This work provides a facile strategy to prepare form‐stable PCMs, which have promising application prospects in the field of thermal regulation.
Compared to solid-liquid phase change energy storage, solid-solid phase change energy storage offers better volumetric stability, thermal stability, and chemical stability. It does not require specialized encapsulation techniques to prevent leakage, thereby simplifying the design and manufacturing process of thermal energy storage (TES) systems, making it an attractive alternative for heat storage. However, the lower latent heat, higher cost, and poor thermal conductivity of solid-solid phase change materials (PCMs) have been significant barriers to their further development. By combining the typical solid-solid PCM, neopentyl glycol (NPG), with the solid-liquid PCM, sodium acetate trihydrate (SAT), and doping it with a small amount of expanded graphite (EG) to synergistically enhance the thermal storage effect, we have developed a composite PCM that effectively leverages the superior properties of each material while overcoming their individual shortcomings. This composite PCM exhibits good shape stability, thermal cycle stability, and improved thermal conductivity. In the mixed system, NPG serves as the primary supporting material, SAT provides higher latent heat, and EG enhances thermal conductivity while inhibiting the phase separation of SAT. The resulting PCM composite demonstrated a 2.7-fold increase in thermal conductivity and a 60 % increase in latent heat compared to pure NPG, while still maintaining solid-solid phase change behavior. This study offers a new solution for TES system design and highlights the significant potential of the synergistic interaction between organic and inorganic phase change materials.
Phase‐change materials (PCMs) stand a pivotal advancement in thermal energy storage and management due to their reversible phase transitions to store and release an abundance of heat energy. However, conventional solid–liquid PCMs suffer from fluidity and leakage in their molten state, limiting their applications at advanced levels. Herein, a novel Zn²⁺‐crosslinked polyethylene glycol‐co‐polyphosphazene copolymer (PCEPN‐Zn) as a solid–solid PCM through dynamic metal‐ligand coordination is first designed and synthesized. The as‐synthesized PCEPN‐Zn is further integrated with an MXene film to construct a double‐layered phase‐change composite through layer‐by layer adhesion. Owing to the introduction of MXene film with low emissivity, good light absorptivity, and nonflammability, the resultant phase‐change composite not only presents a high latent‐heat capacity, good thermal stability, high thermal reliability, and excellent shape stability, but also exhibits a superior self‐healing ability, good recyclability, high adhesivity, and good flame‐retardant performance. It can be easily adhered to on most objects for various application scenarios. With a combination of the excellent functions derived from PCEPN‐Zn and MXene film, the developed phase‐change composite exhibits broad prospects for versatile applications in the thermal management of CPUs and Li‐ion batteries, thermal infrared stealth of high‐temperature objects, heat therapy in the clinic, and fire‐safety for various scenarios.
