Multiplexed electrospraying of water in cone-jet mode using a UV-embossed pyramidal micronozzle film  

作　　者：Ji-hun Jeong Kwangseok Park Hyoungsoo Kim Inyong Park Jinyoung Choi Seung S.Lee 

机构地区：[1]Department of Mechanical Engineering,Korea Advanced Institute of Science and Technology,Daejeon 34141,Republic of Korea [2]Department of Environmental Machinery,Korea Institute of Machinery and Materials,Daejeon 34103,Republic of Korea [3]Department of Mechanical Engineering,Dongshin University,Naju 58245,Republic of Korea

出　　处：《Microsystems & Nanoengineering》2022年第5期247-256,共10页微系统与纳米工程（英文）

基　　金：supported by the National Research Foundation of Korea(NRF)grant funded by the Korean government(MSIT)(NRF-2021R1A2C2013680 and NRF-2021M3E8A2100138);supported by a Dongshin University research grant.

摘　　要：The electrospraying of water in the cone-jet mode is difficult in practical applications owing to its low throughput and the electrical discharge caused by the high surface tension of water.A film with multiple dielectric micronozzles is essential for multiplexed electrospraying of water in cone-jet mode without electrical discharge.Thus,a pyramidal micronozzle film with five nozzles was fabricated using the UV-embossing process.The pyramidal micronozzle film consisted of pyramidal micronozzles,a micropillar array,and an in-plane extractor,which were proposed to minimize wetting and concentrate the electric field to the water meniscus at the tip of the pyramidal micronozzle.The electrospraying of water using a single pyramidal micronozzle was visualized by a high-speed camera at a flow rate of 0.15–0.50ml/h with voltages of 0.0–2.3 kV,−1.6 kV,and−4.0 kV at the water,guide ring,and collector,respectively.Three distinct modes,the dripping,spindle,and cone-jet modes,were observed and distinguished according to the motion of the water meniscus at the nozzle tip.The steady Taylor cone and jet were observed in a voltage range of 1.3–2.0 kV in water,particularly in cone-jet mode.Multiplexed electrospraying of water in cone-jet mode at a flow rate of 1.5ml/h was performed using a pyramidal micronozzle film,demonstrating the potential for a high-throughput electrospraying system.

关 键 词：process. FILM PYRAMIDAL 

分 类 号：O62[理学—有机化学]