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学者姓名：何少凡
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Abstract ：
Enhancing critical heat flux (CHF) and heat transfer coefficient (HTC) by promoting the nucleation, growth, and departure of boiling bubbles has drawn significant attention owing to its wide applications. However, in-depth understanding and comprehensive manipulation of under-liquid bubble dynamics from in situ microscale perspectives remain challenging. Herein, in situ observations and analyses of the microsized boiling bubbles of ultra-low surface tension fluorinated liquids (FLs) are conducted on the superaerophobic silicon surfaces with crisscross microchannels and selective nanowires. It is revealed that deep microchannels yet short nanowires enable ultrafast liquid spreading (<549.6 ms) and ultralow bubble adhesion (approximate to 1.1 N), while an appropriate spacing (240-600 mu m) between microchannels minimizes the bubble departure time (<20.6 ms) due to timely coalescence. By verifying the above bubble dynamics principles through the collaborative enhancement of CHF and HTC, an optimized structure (microchannel depth approximate to 52.9 m, microchannel spacing approximate to 362.9 mu m, nanowire length approximate to 0 nm) is obtained and further implemented onto the exposed Si surface of a commercial CPU chip. Cooled by phase-change of FLs, the average temperature of CPU maintains approximate to 64.9 degrees C even under extreme power loads (approximate to 130 W), far below than those in conventional air-cooling and water-cooling operations.
Keyword ：
boiling heat transfer boiling heat transfer bubble dynamics bubble dynamics micro-/nanostructure micro-/nanostructure phase-change cooling phase-change cooling superaerophobicity superaerophobicity
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| GB/T 7714 | Yu, Chuanghui , Xu, Zhe , He, Shaofan et al. Manipulating Boiling Bubble Dynamics on Under-Liquid Superaerophobic Silicon Surfaces for High-Performance Phase-Change Cooling [J]. | ADVANCED FUNCTIONAL MATERIALS , 2025 , 35 (19) . |
| MLA | Yu, Chuanghui et al. "Manipulating Boiling Bubble Dynamics on Under-Liquid Superaerophobic Silicon Surfaces for High-Performance Phase-Change Cooling" . | ADVANCED FUNCTIONAL MATERIALS 35 . 19 (2025) . |
| APA | Yu, Chuanghui , Xu, Zhe , He, Shaofan , Feng, Chengcheng , Tian, Ye , Jiang, Lei . Manipulating Boiling Bubble Dynamics on Under-Liquid Superaerophobic Silicon Surfaces for High-Performance Phase-Change Cooling . | ADVANCED FUNCTIONAL MATERIALS , 2025 , 35 (19) . |
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Abstract ：
Particulate emissions from high temperature pose a significant threat to air quality, necessitating advanced air filtration materials capable of withstanding extreme temperatures and complex environmental conditions. Here, we report a high-efficiency and high-temperature resistant polyimide/SiO2 (PI/SiO2) nanofiber membrane with excellent air permeability (146 mm/s) and electrostatic effects (-1500 V), fabricated via multi-needle electrospinning followed by thermal imidization. Interface regulation through SiO2 incorporation enhances the membrane's permeability by expanding fiber spacing and increasing tortuosity, thereby prolonging particle-fiber collision time and improving passive filtration performance. The PI/SiO2 fibers also generate self-sustained electrostatic charges through friction with air and inter-fiber contact, imparting active filtration capability. By controlling and increasing the SiO2 content at a constant spinning amount, a balance between filtration efficiency and pressure drop was achieved through enhanced air permeability. Under continuous filtration at 260 degrees C for 240 min, the membrane exhibited exceptional PM0.3 filtration efficiency (99.1668 %) with a modest pressure drop (109 Pa). Furthermore, by integrating electrospun membranes with filter bags and conducting industrial dust simulations, it achieved an ultrahigh filtration efficiency of 99.9993 % with a pressure drop of only 133 Pa. The successful development of PI/SiO2 nanofiber membranes provides a promising strategy for next-generation high-temperature-resistant air filters.
Keyword ：
Air permeability Air permeability Electrostatic effect Electrostatic effect High temperature High temperature PI/SiO2 nanofiber membrane PI/SiO2 nanofiber membrane PM filtration PM filtration
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| GB/T 7714 | Lu, Nan , Yi, Mengtong , Wu, Zuheng et al. Versatile high-temperature air purification with durable, breathable electrostatic filters for ultra-efficient particle capture [J]. | JOURNAL OF MEMBRANE SCIENCE , 2025 , 734 . |
| MLA | Lu, Nan et al. "Versatile high-temperature air purification with durable, breathable electrostatic filters for ultra-efficient particle capture" . | JOURNAL OF MEMBRANE SCIENCE 734 (2025) . |
| APA | Lu, Nan , Yi, Mengtong , Wu, Zuheng , Yang, Yuchen , Gou, Yukui , He, Shaofan et al. Versatile high-temperature air purification with durable, breathable electrostatic filters for ultra-efficient particle capture . | JOURNAL OF MEMBRANE SCIENCE , 2025 , 734 . |
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