Other
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..gecgtp060s&link_type=abstract
American Physical Society, 55th Gaseous Electronic Conference, October 15-18, 2002, Minneapolis, MN, Meeting ID GEC02, abstract
Other
Scientific paper
Dust particles play an important role in plasma, planetary and space physics. Numerous interesting phenomena involving dust particles are related to their charge. Along with charging in plasma, considerable dust charge may result from contact processes with other objects. An experimental method has been developed to investigate dust charging on surfaces. Dust samples are loaded onto clean metal surfaces that are agitated by a small electromagnet. Single dust particles drop through a small hole into a Faraday cap for charge measurements. The dust samples investigated are of large variety including metallic and insulating grains and lunar (JSC-1) and Martian (JSC-Mars-1) regolith simulants. A typical contact charge on a 100 micron sized insulating dust particle is 10E5 - 10E6 elementary charges and increases with repeated contacts. The contact charging of metallic grains is significantly lower. The contact charge varies linearly with the work function of the surfaces and with dust size. Oxidized metal surfaces charge the dust particles in a similar way independent of the metal's work function. By contacting the dust samples with different surfaces, the effective work function of the dust samples is determined. External electric fields applied above the surface influence contact charging and may alter the sign of the resulting dust charge.
Horanyi Mihaly
Robertson Scott
Sternovsky Zoltan
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