摘要
Microencapsulation of phase change materials(MPCM)is an effective way to achieve solar energy management.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 TiO_(2)nanoparticles into MPCM can alleviate supercooling.In this work,octadecyltrimethoxysilane(ODTMS)was used to modify the solid nucleating agent TiO_(2)(m-TiO_(2))to improve its compatibility with n-Octadecane.Then,MPCM based on m-TiO_(2)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-TiO_(2),while the MPCM with unmodified TiO_(2)is 6.1℃and the MPCM without nucleating agent is 4.1℃.Besides,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 capabilities 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 after 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 application potential in the field of solar energy thermal management and human thermal regulation.
基金
supported by the National Natural Science Foundation of China(No.U20A20299)
the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515011985)
the support from the Scientific and Technological Innovation Strategy Program of Guangdong Province:Guangdong-Hong Kong-Macao Technology Cooperation Funding Scheme(No.2022A0505030026).
