Effect of the surface energy of particle materials on the accommodation of gas molecules to the particle surfaces

Haesung Jung, Koohee Han, George W. Mulholland, David Y.H. Pui, Jung Hyeun Kim

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9 Scopus citations


In this study, the slip correction factor is assessed from the measurements of the electrical mobilities of PSL, SiO2 and Au nanoparticles under reduced pressure conditions. The asymptotic value (α+β) of the slip correction factor, which is generally used for evaluating the particle drag force, are obtained for three different particle materials, and the values are used to assess the momentum accommodation function. Our experimental results show that the gas molecular slip is strongly dependent on the particle material characteristics. The higher the surface energy of the particle materials (PSL: 0.06J/m2, SiO2: 0.30J/m2, and Au: 8.78J/m2), the more diffusive reflections observed in gas molecular collisions with nanoparticles (PSL: 87.3%, SiO2: 89.2%, and Au: 99.6%).

Original languageEnglish (US)
Pages (from-to)42-48
Number of pages7
JournalJournal of Aerosol Science
StatePublished - 2013

Bibliographical note

Funding Information:
This work was partly supported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No. 20124010203260 ). It was also partly supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (No. 2012-0003933 ).


  • Accommodation
  • Differential mobility analyzer
  • Drag force
  • Nanoparticles
  • Slip correction factor
  • Surface energy


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