Design and synthesis of multifunctional microencapsulated phase change materials with silver/silica double-layered shell for thermal energy storage, electrical conduction and antimicrobial effectiveness.
Xiaoyu Zhang, Xiaodong Wang*, Dezhen Wu.
Energy, 2016, 111: 498–512.
【摘要】We have synthesized a novel type of multifunctional microcapsules based on an n-eicosane phase-change material (PCM) core and a silver/silica double-layered shell through interfacial polycondensation followed by sliver reduction. The resultant microcapsules showed the regular spheres with a well-defined core-shell structure and a silver outer layer. The characterization of chemical composition and crystalline structure indicated that the microcapsules had a perfect silver outer layer when the reaction time for reduction and deposit of silver ions was set to 20 h. The ****ysis of differential scanning calorimetry indicated that the microcapsules contained about 67 wt % of n-eicosane core under the encapsulation of 33 wt % shell materials. The microcapsules also achieved high latent-heat storage and release efficiency and a good thermal regulating capability. Most of all, the microcapsules achieved a high electrical conductivity of 130 Ω·m. These microcapsules were also found to have a high antibacterial activity, especially against Staphylococcus aureus and Bacillus subtilis, and they exhibited good antimicrobial effectiveness with a sterilization rate of above 95% at the contact time of 4 h. With such a multifunctional feature, the microcapsules designed by this study show potential applications in microelectronic and biomedical fields.
