Size-dependent electron chemical potential: Effect on particle charging |
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Authors: | John C Angus Isaac Greber Kathleen Kash |
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Institution: | 1. Department of Chemical Engineering, Case Western Reserve University, Cleveland, OH 44106, USA;2. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, USA;3. Department of Physics, Case Western Reserve University, Cleveland, OH 44106, USA |
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Abstract: | Electrostatic charging of particles of identical composition, but different sizes, is a poorly understood phenomenon that may be of importance in dust storms, generation of lightning, numerous technological applications involving solid particulates, and in the agglomeration of lunar dust and inter-stellar dust clouds. We show that under optical excitation, the relative magnitude of surface to volume de-excitation gives size-dependent electron and hole concentrations. The consequent differences in chemical potentials can lead to charge transfer between particles of different size. The direction of charge transfer, from large to small or vice versa, depends critically on the properties of the materials. |
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Keywords: | Size dependent chemical potential Particulate charging Volume de-excitation Surface de-excitation Symmetry breaking |
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