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apparatus area of true asperities atoms ball barrier capacitance charge density clean coefficient of friction conduction band conductor contact charging contact electrification contact potential crystal faces curve depends dielectric constant discharge distribution double layer effect electric field electrification electrolytic electrometer electrophobic electrostatic energy levels equation experimental experiments Fermi level fibres field emission film force formula give rise glass Harper heat hot spot increased insulator intrinsic semiconductor ions lattice load material transfer measured mechanism mercury metal negative charge number of electrons obtained occur ohm cm order of magnitude p-type semiconductor particles plane Plate polarization positive charge potential difference powder pressure protons quartz radius resistivity rubbing rutile separation charge shown in Fig sign of charging silica sliding solid space charge speed spheres sufficiently surface density temperature textiles theory thermal thickness tion triboelectric triboelectric charging true contact unit area valence band wave-function zero