高压脉冲电场（Pulsed Electric Field,PEF）是一项极具前景的食品非热杀菌技术,其处理关键部件——处理室直接影响杀菌效果。作者设计了电场分布均匀、处理物料容量可调、安全可靠的PEF处理室,应用该PEF处理室对接种大肠杆菌的液蛋进...高压脉冲电场（Pulsed Electric Field,PEF）是一项极具前景的食品非热杀菌技术,其处理关键部件——处理室直接影响杀菌效果。作者设计了电场分布均匀、处理物料容量可调、安全可靠的PEF处理室,应用该PEF处理室对接种大肠杆菌的液蛋进行杀菌,当电场强度为34.2 kV/cm处理时间为400μs时,原样品菌体浓度为10^6-10^7cfu/mL,大肠杆菌细菌数量降低了约5.05个对数,从而说明作者设计的静态处理室是可行的,可以进行杀菌钝酶等相关机理研究。展开更多
With pretty high surface tension, the room temperature liquid metal may inherit with unexpected be- haviors that conventional fluids could not own. Here, we disclosed the coalescence and ejection phenomena of liquid m...With pretty high surface tension, the room temperature liquid metal may inherit with unexpected be- haviors that conventional fluids could not own. Here, we disclosed the coalescence and ejection phenomena of liquid metal droplets via high-speed camera. It was experimen- tally found that, when gently contacting （rather than col- liding） two metal droplets with identical size together in NaOH solution, oscillating coalescence would happen which runs just like a spring after the interface ruptures and forms capillary waves. For two metal droplets with evidently different diameters, the coalescence induces rather unusual ejection phenomena. The large droplet would swallow part of the small one and then eject another much smaller droplet. Such phenomenon provides a direct evidence for the existence of electrical double layer on metal droplets. The dynamics fluid impacting behaviors were quantified through processing images from the recorded movies, and the basic differences between the liquid metal droplets and that of water droplets were clar- ified. Theoretical mechanisms related to the events were preliminarily interpreted. The present finding refreshes the basic understanding of the liquid metal droplets, which also suggests potential values of applying such fundamental effects to characterize viscosity, surface tension, electrical double layer of the metal fluids and droplet formations.展开更多
文摘高压脉冲电场（Pulsed Electric Field,PEF）是一项极具前景的食品非热杀菌技术,其处理关键部件——处理室直接影响杀菌效果。作者设计了电场分布均匀、处理物料容量可调、安全可靠的PEF处理室,应用该PEF处理室对接种大肠杆菌的液蛋进行杀菌,当电场强度为34.2 kV/cm处理时间为400μs时,原样品菌体浓度为10^6-10^7cfu/mL,大肠杆菌细菌数量降低了约5.05个对数,从而说明作者设计的静态处理室是可行的,可以进行杀菌钝酶等相关机理研究。
基金This work was partially supported by the Re- search Funding of the Chinese Academy of Sciences （KGZD-EW-T04-4） and the National Natural Science Foundation of China （81071225）.
文摘With pretty high surface tension, the room temperature liquid metal may inherit with unexpected be- haviors that conventional fluids could not own. Here, we disclosed the coalescence and ejection phenomena of liquid metal droplets via high-speed camera. It was experimen- tally found that, when gently contacting （rather than col- liding） two metal droplets with identical size together in NaOH solution, oscillating coalescence would happen which runs just like a spring after the interface ruptures and forms capillary waves. For two metal droplets with evidently different diameters, the coalescence induces rather unusual ejection phenomena. The large droplet would swallow part of the small one and then eject another much smaller droplet. Such phenomenon provides a direct evidence for the existence of electrical double layer on metal droplets. The dynamics fluid impacting behaviors were quantified through processing images from the recorded movies, and the basic differences between the liquid metal droplets and that of water droplets were clar- ified. Theoretical mechanisms related to the events were preliminarily interpreted. The present finding refreshes the basic understanding of the liquid metal droplets, which also suggests potential values of applying such fundamental effects to characterize viscosity, surface tension, electrical double layer of the metal fluids and droplet formations.
