Ultrasonically regenerable nano-phase change emulsions with low supercooling and high shear stabilityOA
Ultrasonically regenerable nano-phase change emulsions with low supercooling and high shear stability†
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.
Yuyao Guo;Jinxin Feng;Zhihao Xia;Ziye Ling;Xiaoming Fang;Zhengguo Zhang
Key Laboratory of Enhanced Heat Transfer and Energy Conservation,The Ministry of Education,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou,510640,ChinaGuangdong Engineering Technology Research Center of Efficient Heat Storage and Application,South China University of Technology,Guangzhou 510640,ChinaGuangdong Engineering Technology Research Center of Efficient Heat Storage and Application,South China University of Technology,Guangzhou 510640,ChinaKey Laboratory of Enhanced Heat Transfer and Energy Conservation,The Ministry of Education,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou,510640,China||Guangdong Engineering Technology Research Center of Efficient Heat Storage and Application,South China University of Technology,Guangzhou 510640,ChinaKey Laboratory of Enhanced Heat Transfer and Energy Conservation,The Ministry of Education,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou,510640,China||Guangdong Engineering Technology Research Center of Efficient Heat Storage and Application,South China University of Technology,Guangzhou 510640,ChinaKey Laboratory of Enhanced Heat Transfer and Energy Conservation,The Ministry of Education,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou,510640,China||Guangdong Engineering Technology Research Center of Efficient Heat Storage and Application,South China University of Technology,Guangzhou 510640,China
Nano-phase change emulsionsLow-temperature stabilitySupercooling controlHigh-energy regeneration techniqueNucleating agent selection
Nano-phase change emulsionsLow-temperature stabilitySupercooling controlHigh-energy regeneration techniqueNucleating agent selection
《工业化学与材料（英文）》 2026 (2)
212-225,14
This work is supported by Dongguan Key Research&Development Program(No.20231200300152).
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