Anomalous Charging Behavior of Inorganic Materials
Version 2 2018-05-20, 12:03
Version 1 2018-05-20, 12:03
Posted on 2018-05-20 - 12:03
Surface charge on
materials is important due to its wide range
of consequences and applications in many industries (e.g., semiconductor).
One important parameter needed for the design of devices and selection
of materials is the polarity of charge of solid surfaces after the
surfaces are charged by contact electrification. Currently, it is
only known that one surface charges positively, whereas the other
surface charges negatively after contact (i.e., in accordance to the
law of conservation of charge). This manuscript describes a previously
unreported anomalous charging behavior of a general class of materials:
the inorganic materials. Both contacting inorganic materials charged
either both positively (e.g., mica and NaCl) or both negatively (e.g.,
quartz and CaF2). A close monitoring of the charge in real
time showed that charge was conserved immediately after contact; however,
an active interaction of the separated surfaces and the surrounding
atmosphere unexpectedly changed the polarity of one surface rapidly
(e.g., 1 s), thus resulting in both positively or both negatively
charged surfaces. This anomalous charging behavior fundamentally changes
our understanding of the design of devices related to contact electrification
of inorganic materials and the triboelectric series.
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Fang, Yan; Chen, Linfeng; Sun, Yajuan; Yong, Wai Pong; Soh, Siowling (2018). Anomalous Charging Behavior of Inorganic Materials. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.8b02478
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AUTHORS (5)
YF
Yan Fang
LC
Linfeng Chen
YS
Yajuan Sun
WY
Wai Pong Yong
SS
Siowling Soh