Paraffin/methyl stearate/multi‐walled carbon nanotubes composite phase change materials with wide service temperature and high latent heat

Abstract

The paraffin/methyl stearate/multi-walled carbon nanotubes composite formstable phase change materials (FSPCMs) with a wide phase change temperature (T pc ) range and high latent heat (ΔH) and the subsequent phase change slurry (PCS) based on FSPCMs have been prepared via a direct impregnation method and via a simple dispersion method, respectively. The chemical structures, crystalline properties, surface microstructures, phase change properties, thermal reliability and stability of FSPCMs and the thermal storage and release performance were investigated. The FSPCMs had reversible melting/freezing phase change properties with a wider T pc range from 21.6 C to 55.3 C than that of pure methyl stearate (from 16.2 C to 32.5 C) and high ΔH of 127 J/g. The FSPCMs had good thermal reliability and stability. The PCS presented evident thermal storage and release performance compared to pure water. The FSPCMs and PCS enable huge potential applications in thermal fields depending on wide T pc range.

Thermal-Conductive, Dynamic Cross-Linked Solid–Solid Phase Change Composites toward Sustainable Energy Utilization

“…In order to address the forementioned issues, extensive attention has been paid to develop phase change composites (PCCs) with an external supporting skeleton by infiltrating SLPCMs into porous materials − or encapsulating SLPCMs within polymer/filler blending microspheres. ,,, The supporting materials not only prevent leakage of the SLPCMs but also improve their thermal conductivity and photoabsorption ability. ,− For instance, Wu et al synthesized a novel highly conductive scalable form-stable phase change material by aligning self-assembled large-size reticulated graphite nanoplatelets (RGNPs) for efficient photothermal conversion and storage . However, most of the reported PCCs, such as form-stable phase change materials (FSPCMs), demonstrate strong rigidity at low temperature and become very fragile during the phase change process .…”

Temperature‐Responsive Thermochromic Phase Change Materials with Tunable Photothermal Conversion Efficiency Toward Solar Energy Storage

“…[19] PCMs can be divided into organic, inorganic and composite phase change materials according to their composition. Organic PCMs such as paraffin, [20][21][22][23] polyethylene glycol, [24][25][26][27] fatty acids, [7,28] and fatty alcohols [19,29] are widely used in the field of solar thermal energy storage due to their significant advantages such as high latent heat, no corrosion, no volume effect, nontoxic, and nonhazardous. [30][31][32] Conventional pure organic PCMs are white crystalline solids with low absorption and high diffuse reflectance of sunlight, leading to a low photothermal conversion efficiency to sunlight.…”