Photo‐thermal conversion and heat storage characteristics of multi‐walled carbon nanotubes dispersed magnetic phase change microcapsules slurry

Abstract

Summary The development of high‐efficient working fluids with excellent photo‐thermal conversion and heat storage properties is an important factor to solar thermal utilization. In this work, magnetic phase change microcapsules (MPCMs) were prepared via in situ polymerization, where melamine‐formaldehyde (MF) resin and octadecane containing oleic acid‐coated magnetic nanoparticles (OA‐MNs) were used as the shell and core, respectively. The microstructure, magnetic and thermal properties of MPCMs were investigated, and the photo‐thermal conversion and heat storage properties of slurries prepared by dispersing MPCMs into multi‐walled carbon nanotubes (MWCNTs) nanofluids were explored. The encapsulation efficiency of MPCMs with superparamagnetic nature achieved 63.51%, while the thermal conductivity of MPCMs was slightly increased with regard to phase change microcapsules (PCMs) and the thermal stability of octadecane was enhanced after being encapsulated. Moreover, the slurry with 0.01 wt% MWCNTs and 15 wt% MPCMs had the optimal photo‐thermal conversion properties and thermal storage capacity. Beyond that, the recycled MPCMs represented excellent recyclability. Our research demonstrated that the MWCNTs‐dispersed MPCMs slurry is one of ideal working fluids with excellent photo‐thermal conversion and heat storage characteristics for direct absorption solar collector.

Melamine Foam/CNT/Graphene Hybrid Aerogel-Based Phase Change Composites with High Latent Heat Capacity for Solar/Electrothermal Conversion

“…This can be explained by the high irradiation intensity leading to a shorter time to charge the sample, which may cause less energy loss. Furthermore, Table presents the photothermal conversion and storage capacity of other research on octadecane-based phase change composites. ,− Table S4 also compares various other organic PCMs serving as the primary component of a range of composites, illustrating a comprehensive picture of the innovative nature of the research. − The results of this study, in comparison to those reported in the existing literature, position the work at a relatively high level. These findings affirm the exceptional photothermal conversion and storage capacities of the composite PCMs synthesized in this work.…”

Measurement of the Photothermal Conversion Efficiency of CNT Films Utilizing a Raman Spectrum

“…Carbon nanotubes (CNTs) are widely used in seawater desalination [ 1 , 2 , 3 , 4 , 5 , 6 ], environmental protection [ 7 ], thermal energy storage [ 8 , 9 , 10 , 11 ], photothermal dynamic therapy [ 12 , 13 , 14 ], and photodetectors [ 15 , 16 , 17 , 18 ] because of their efficient photothermal conversion ability. However, the synthesis process of CNTs is difficult to control strictly, which often induces complex morphologies and chirality distribution; simultaneously, some defects and impurities are also introduced.…”

Preparation of High Thermo-Stability and Compactness Microencapsulated Phase Change Materials with Polyurea/Polyurethane/Polyamine Three-Composition Shells through Interfacial Polymerization

“…Microencapsulated phase change materials (MicroPCMs) have expanded the application and market prospects of phase change materials [ 1 , 2 , 3 , 4 ], which include textiles, dyeing and printing [ 5 , 6 , 7 ], building energy saving [ 8 , 9 , 10 ], microencapsulated phase change slurry [ 11 , 12 , 13 ] and composite foam [ 14 , 15 , 16 ].…”