3 years ago

Particle-Size-Dependent Triboelectric Charging in Single-Component Granular Materials: Role of Humidity

Particle-Size-Dependent Triboelectric Charging in Single-Component Granular Materials: Role of Humidity
Siddharth Rajupet, Amber K. Phillips, Daniel J. Lacks, R. Mohan Sankaran, Joseph R. Toth
We carry out experiments to investigate the triboelectric charging due only to particle–particle collisions as a function of humidity. At low humidity, we find that large particles tend to charge positive and small particles tend to charge negative, in agreement with previous studies. However, at high humidity, we find no significant particle-size dependence for the particle charging. To explain these results, we apply a theoretical model based on charge carriers trapped in nonequilibrium surface states characteristic of electrically insulating materials. Monte Carlo simulations show that collisions between particles enable the charge carriers to reach lower energy states on other particles. These nonequilibrium dynamics lead to an accumulation of charge carriers on small particles, and if the charge carriers are negative (electrons or negative ions), the small particles would tend to charge negatively. We propose that humidity leads to conductive layers on the surface of particles that act as a sink for charge carriers and thus reduce the particle-size-dependent charging that follows from the presence of the charge carriers in nonequilibrium states.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02328

DOI: 10.1021/acs.iecr.7b02328

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.