Bipolar coagulation in bipolar electrosprays: Optimizing coagulation efficiency and hetero-agglomerate composition

IF 3.9 3区环境科学与生态学 Q2 ENGINEERING, CHEMICAL

Journal of Aerosol Science Pub Date : 2025-03-05 DOI:10.1016/j.jaerosci.2025.106557

Matthias Kawalek, Wolfgang Peukert, Christian Lübbert

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引用次数: 0

Abstract

This work investigates the bipolar coagulation of oppositely charged nanoparticles, a few nanometers in size, generated by a bipolar electrospray. These particles form after highly charged droplets produced by the electrospray evaporate, carrying a fraction of the initial droplet charge. The particle charge fraction depends on the non-volatile volume fraction of the feed solution. However, during evaporation, ions and charged clusters form that carry the remaining droplet charge, competing with particle-particle coagulation and thus reducing coagulation efficiency. To enhance coagulation efficiency, the non-volatile volume fraction of the feed solution was increased by adding diethylene glycol (DEG). Additionally, the number of salt particles in the agglomerates was tuned by changing the conductivity ratio of the feed solutions. Experiments were conducted using glucose and sodium chloride particles as a model system for material based applications. Notably, glucose evaporates completely from the coagulated particles, making this system suitable for our tandem DMA setup with a tube furnace between the two DMAs. This setup allowed us to obtain 2D distributions containing information on agglomerate concentration and composition and to optimize coagulation efficiency.

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来源期刊

Journal of Aerosol Science 环境科学-工程：化工

CiteScore

8.80

自引率

8.90%

发文量

127

审稿时长

35 days

期刊介绍： Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.