Preparation And Characterization Of Organic Composite Phase Change Energy Storage And Heat Transfer Materials

With the development of society and economy,the problem of energy shortage is becoming increasingly serious.Phase change energy storage technology by using phase change materials has great research significance because of its high energy storage density.In this article,three kind of novel organic phase-change composite phase-change energy-storage heat-transfer materials were prepared for myristic acid/titanium dioxide,capric acid/titanium dioxide,hexadecanol-myristic acid eutectic/activated carbon.Fourier transform infrared spectrometers,X-ray diffractometers,field emission scanning electron microscopes,differential scanning calorimeters and thermogravimetric analyzers were used to test the chemical structure,micromorphology,and the thermodynamic properties.The myristic acid/titanium dioxide microcapsule composite phase change energy storage material was prepared by a sol-gel method,wherein myristic acid was used as a phase change energy storage material to store and release energy,and titanium dioxide was used as a shell supporting material to wrap myristic acid.According to Fourier transform infrared and X-ray diffraction detection and analysis,it is known that the core material and the shell material in the prepared microcapsules are only physically combined and no chemical reaction occurs;the observation of field emission scanning electron microscope showed that the coating of myristic acid by titanium dioxide as shell material was in good condition,which could effectively prevent the leakage of liquid myristic acid.The DSC results showed that the ideal sample MPCM1 melted at 54.97? with the melting enthalpy of 55.76 J/g,and solidifies at 49.85?,the latent heat of transformation is 54.55 J/g.In general,the prepared microcapsule phase change materials have good thermodynamic properties and thermal stability,and have great potential in energy storage and application.The capric acid/titanium dioxide composite phase change energy storage material was prepared by porous matrix adsorption method,in which decanoic acid was used as phase change material to store and release energy.titanium dioxide powder was used to adsorb capric acid,which played the role of supporting and protecting phase change material.The test results showed that capric acid was adsorbed on the surface and inside by titanium dioxide powder.The melting temperature and solidification temperature of the ideal composite phase change material were 32.40? and 25.76?,and the latent heat of phase change were 35.66 J/g and 32.23 J/g.The results of TGA showed that the composite phase change material of capric acid and titanium dioxide have good thermal stability and reliability,which could be used to store energy.The hexadecanol-myristic acid eutectic/activated carbon phase change materials were prepared by porous matrix adsorption method,in which the energy was stored and released by the hexadecanol-myristic acid eutectic,and the activated carbon was used to absorb the eutectic to prevent the overflow of the phase change materials in the melting state.Field emission scanning electron microscopy showed that the adsorption of hexadecanol myristic acid eutectic on activated carbon was good and well distributed.The melting and solidification temperatures of the composite phase change materials were 42.3 8? and 38.32?,and the latent heat of phase change was 76.24 J/g and 67.08 J/g.The results of TGA showed that the composite phase change material of hexadecanol-myristic acid/activated carbon had good thermal stability and reliability.The composite phase change materials with stable shape have great potential in thermal energy storage.