Heterogeneity of surface potential in contact electrification under ambient conditions A comparison of pre- and post-contact states.pdfVIP

Heterogeneity of surface potential in contact electrification under ambient conditions A comparison of pre- and post-contact states.pdf

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Heterogeneity of surface potential in contact electrification under ambient conditions A comparison of pre- and post-contact states.pdf

Journal of Electrostatics 81 (2016) 76e81 Contents lists available at ScienceDirect Journal of Electrostatics journal homepage: /locate/elstat Heterogeneity of surface potential in contact electri?cation under ambient conditions: A comparison of pre- and post-contact states A.M. Barnes 1, A.D. Dinsmore* Department of Physics, University of Massachusetts, Amherst, Hasbrouck Lab, 666 North Pleasant St., Amherst, MA 01003, USA article info Article history: Received 25 September 2015 Received in revised form 1 April 2016 Accepted 1 April 2016 Available online 10 April 2016 Keywords: Contact electri?cation Kelvin probe microscopy Surface charge abstract We measured the pattern of charging by contact electri?cation, following contact between a polydimethylsiloxane (PDMS) stamp and a glass substrate with gold electrodes. We used scanning Kelvin probe microscopy to map the surface potential at the same regions before and after contact, allowing a point-by-point comparison. After contact, the mean surface potential of the glass shifted by 360 mV and micron-scale heterogeneity appeared with a magnitude of ~100 mV. The gold electrodes showed charge transfer but no discernible heterogeneity. These results show that contact electri?cation causes heterogeneity of surface potential even on non-polymer surfaces such as glass under ambient conditions. ? 2016 Elsevier B.V. All rights reserved. 1. Introduction The transfer of charges between two surfaces that are brought into contact and then separated is a familiar everyday occurrence. An example of this process, which is known as contact electri?cation, is rubbing a balloon on ones head and observing that hair clings to the balloon. Contact electri?cation is prevalent in many technological applications, including laser printing and photocopying [1e5] and triboelectric generators [6,7]. It is also perceived to be the cause for adhesion of granular media [8,9], which can lead to explosions in grain silos [10] as well as equipment malf

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