Research on modified carbon aerogel/paraffin composite phase change thermal storage materials
The building energy consumption can be reduced with the utilization of paraffin for walls,but an easy leakage of this material seriously affects the extensive application of composite phase change heat storage materials,which is expected to be solved by using carbon aerogel with large adsorption capacity as adsorption carrier.In order to further improve the par-affin adsorption performance,the surface of carbon aerogel was modified with trimethylsilyl chloride in different concentra-tions and the surface microstructure evolution of carbon aerogel was investigated by XRD,SEM and FT-IR.The experiment manifested that the—Cl—Si(CH3)3 group of trimethylchlorosilane could branch with—OH on the surface of carbon aero-gel in the process of modification,which enriched the amount of—CH3 on the surface of the sample,improved the hydro-phobicity and pore structure of the product,and improved its ability to adsorb non-polar paraffin.When the mass concentra-tion of trimethylsilyl chloride reached 30%,the carbon aerogel showed the best adsorption performance,and could absorb 85.87%of paraffin after full immersion.After 200 melting-condensation cycles,no obvious leakage was found and signifi-cant change was not obvious in phase change temperature and enthalpy.The composite phase change material had excellent structural stability and thermal insulation performance,which provided new ideas for the development of new wall insula-tion materials.
NETL
NSTL
万方数据
