Abstract
Microencapsulation of phase change materials(MPCM)is an effective way to achieve solar energy man-agement.However,the crystallization of phase change materials(PCMs)in microcapsules will produce supercooling,which will affect the energy storage efficiency of MPCM.The incorporation of TiO2 nanopar-ticles into MPCM can alleviate supercooling.In this work,octadecyltrimethoxysilane(ODTMS)was used to modify the solid nucleating agent TiO2(m-TiO2)to improve its compatibility with n-Octadecane.Then,MPCM based on m-TiO2 nucleating agent,melamine-formaldehyde resin(MF)shell material,and n-Octadecane core material was prepared.Differential scanning calorimetry(DSC)results demonstrate that the supercooling degree(ΔT)of MPCM(MPCM-02)decreases to 0 ℃ with a tiny level of 0.25 wt％m-TiO2,while the MPCM with unmodified TiO2 is 6.1 ℃ and the MPCM without nucleating agent is 4.1 ℃.Be-sides,the phase change enthalpy(ΔHm)and encapsulation efficiency(E)of MPCM-02 remain at 183.7 J/g and 95.3％,respectively.Finally,phase change composite materials with photothermal conversion capa-bilities were constructed by MXenes,MPCM,and polyurethane acrylate(PUA).When 1 wt％MXenes and 30 wt％MPCM were incorporated into PUA matrix,the thermal conductivity and surface temperature af-ter 1200s of infrared light irradiation were 48.8％and 8.2 ℃ higher than pure PUA matrix.These results demonstrate the good solar energy storage capabilities of the MPCM,which possesses promising applica-tion potential in the field of solar energy thermal management and human thermal regulation.
基金项目
National Natural Science Foundation of China(U20A20299)
Guangdong Basic and Applied Basic Research Foundation(2023A1515011985)
Scientific and Technological Innovation Strategy Program of Guangdong Province:Guangdong-Hong Kong-Macao Technology Cooperat(2022A0505030026)
NETL
NSTL
万方数据