Nano-phase change emulsions(NPCEs)are attractive thermal fluids for applications such as cold-chain logistics,vaccine storage,and low-temperature energy systems operating in the 0–20℃range.However,their deployment i...Nano-phase change emulsions(NPCEs)are attractive thermal fluids for applications such as cold-chain logistics,vaccine storage,and low-temperature energy systems operating in the 0–20℃range.However,their deployment is hindered by significant supercooling and poor stability under shear.Here,we report a formulation strategy combining surfactant and nucleating agent optimization to prepare NPCEs with suppressed supercooling(<0.5℃)and high dispersion stability.The NPCEs maintain structural integrity after 24 h of continuous shear at 5℃,with droplet size variation within 20 nm.Rheological and microscopic analyses elucidate the interfacial disruption mechanism under low-temperature shear,and a nucleating agent selection principle is established based on molecular conformation and crystallization compatibility.To address performance degradation,we develop a high-energy ultrasonic on-line regeneration method that rapidly restores thermal functionality without system downtime.The NPCEs achieve>99.5%latent heat recovery and maintain stable performance over 60 days of thermal and mechanical cycling.This work demonstrates a regenerable NPCE system featuring ultra-low supercooling and long-term operational stability.The findings offer a practical pathway for scalable deployment of advanced thermal fluids in energy-efficient industrial applications.展开更多
基金supported by Dongguan Key Research&Development Program(No.20231200300152).
文摘Nano-phase change emulsions(NPCEs)are attractive thermal fluids for applications such as cold-chain logistics,vaccine storage,and low-temperature energy systems operating in the 0–20℃range.However,their deployment is hindered by significant supercooling and poor stability under shear.Here,we report a formulation strategy combining surfactant and nucleating agent optimization to prepare NPCEs with suppressed supercooling(<0.5℃)and high dispersion stability.The NPCEs maintain structural integrity after 24 h of continuous shear at 5℃,with droplet size variation within 20 nm.Rheological and microscopic analyses elucidate the interfacial disruption mechanism under low-temperature shear,and a nucleating agent selection principle is established based on molecular conformation and crystallization compatibility.To address performance degradation,we develop a high-energy ultrasonic on-line regeneration method that rapidly restores thermal functionality without system downtime.The NPCEs achieve>99.5%latent heat recovery and maintain stable performance over 60 days of thermal and mechanical cycling.This work demonstrates a regenerable NPCE system featuring ultra-low supercooling and long-term operational stability.The findings offer a practical pathway for scalable deployment of advanced thermal fluids in energy-efficient industrial applications.
